S-8335 Series S-8335 Series bias supply Multi Line Addressing (ML

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S-8335 Series S-8335 Series bias supply Multi Line Addressing (ML

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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
S-8335 Series
S-8335 Series bias supply Multi Line Addressing (MLA) driven using dual-line simultaneous selection mode. This supports medium-sized panels. step-up type inverter type control CMOS switching regulators supply required positive negative power MLA-driven common drivers segment drivers. Because CMOS structure, current consumption S-8335 Series extremely low, which makes ideal power supply portable equipment that requires power consumption. Also, extremely power consumption module created using S-8335 Series with common driver (HD66523R1: Manufactured Hitachi, Ltd.) segment driver (HD665221: Manufactured Hitachi, Ltd.).
1:These drivers able support 1/240duty 1/200duty.
Features
Supports four types panels (1/240 duty, 1/200 duty, 1/160 duty, 1/120 duty). Input voltage range: (The S-8335 driven single direct-coupled lithium battery.) Output voltage range Common driver positive power supply (VRH) output voltage range(typ.value) 8.91 16.59 (S-8335A240FT) 8.22 15.30 (S-8335A200FT) 7.48 13.93 (S-8335A160FT) 6.66 12.41 (S-8335A120FT) (This supply varied on-chip 6-bit electric volume. Power MOSFET built in.) Common driver negative power supply (VRL) output voltage range(typ.value) -6.87 -12.80 (S-8335A240FT) -6.18 -11.49 (S-8335A200FT) -5.44 -10.13 (S-8335A160FT) -4.61 -8.59 (S-8335A120FT) Segment driver positive power supply (VCH) output voltage range Segment driver intermediate potential (VM) output voltage range Icon positive power supply (VICON) output voltage range (This supply arbitrarily external resistors.) current consumption typ. (mode VBAT typ. (mode VBAT max. (mode VBAT Triple operation mode function: Triple mode switching according 2-bit input Mode Normal operation Mode Icon mode (reference voltage circuit- regulator S-only operation) Mode Standby mode (power off) Power-off function Stops step-up step-down operation short circuits on-chip external transistors. Soft-start function: This function according external capacitor (CSS). Oscillation frequency: kHz, Duty Lead-free products
Applications
Power supply medium-sized panel
Package Name
24-pin TSSOP package (PKG diagram code: FT024-A) Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Block Diagram
VSTR_B CONT1
VOUT1
CONT3
RESET
VBAT
DC/DC
control circuit
Electric volume
VOUT3
VCLK
VDIN
DC/DC
control circuit
DC/DC
Mode control circuit
control circuit
VQERR
Reference voltage generation circuit
VREFU CREFU
Oscillator
op-amp
VDDX
VREGSF VREGSO VREGTF VREGTO
EXT2
op-amp
CRS1 VICON CRT1
small current VSS,
large current
Figure Block Diagram Note: Except op-amp power internal circuits S-8335 Series supplied VBAT pins. power supply op-amp uses VOUT3, which generated stepping VBAT using DC/DC Short-circuit VOUT3 VDDX pins shown figure above.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Selection Guide
Product name
S-8335A FT-TB-G
Package name (abbreviation) Product type 240: 1/240 duty support 200: 1/200 duty support 160: 1/160 duty support 120: 1/120 duty support Product list S-8335AXXXFT Series Bias Ratio Common Driver Positive Power Supply Output Voltage Range VRH_min S-8335A240FT-TB-G S-8335A200FT-TB-G S-8335A160FT-TB-G S-8335A120FT-TB-G 8.75 8.04 7.33 6.50 8.91 8.22 7.48 6.66 VRH_max 16.59 15.30 13.93 12.41 Common Driver Negative Power Supply Output Voltage Range VRL_min -6.87 -6.18 -5.44 -4.61 VRL_max -12.80 -11.49 -10.13 -8.59
Note: VRH_min VRL_min indicate typical value output voltage, respectively, when electric volume minimum, VRH_max VRL_max indicate typical value output voltage, respectively, when electric volume maximum. Also, VRH_max obtained from VRETGO 7.136 VRH_min obtained from VRETGO 3.832, where VRETGO regulator output voltage.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series Assignment
24-pin TSSOP Package view
CONT1 VDIN VCLK VSTR_B VOUT1 VREGTO VREGTF VREGSO VREGSF VBAT CONT3 VOUT3 VREFU VDDX VBAT EXT2 VQERR
Name CONT1 VDIN VCLK VSTR_B VOUT1 VREGTO VREGTF VREGSO VREGSF VBAT VQERR EXT2 VBAT VDDX VREFU VOUT3 CONT3
Function External inductor connection Electric volume data input Electric volume clock input Electric volume strobe signal input Switching regulator output voltage Soft start capacitor connection Regulator output Regulator feedback input Regulator output Regulator feedback input Power supply amplifier output Switching regulator output voltage monitoring Switching regulator external transistor connection Power supply amplifier output amplifier power supply Switching regulator internal reference voltage Switching regulator output voltage Operating mode control Operating mode control External inductor connection
Absolute Maximum Ratings
(Unless otherwise specified: TOPR=25°C) Parameter VBAT voltage CONT1 voltage CONT1 current VOUT1 voltage EXT2 voltage EXT2 current CONT3 voltage CONT3 current VOUT3 voltage VQERR voltage VDDX voltage voltage Other voltage Power dissipation Operating temperature range Storage temperature range TOPR TSTG Symbol VBAT VCONT1 ICONT1 VOUT1 VEXT2 IEXT2 VCONT3 ICONT3 VOUT3 VQERR VDDX Ratings
-0.3
Unit
-0.3 -0.3 VBAT+20 -0.3
-0.3 -0.3
-0.3 VDDX+0.3 -0.3 VBAT+0.3
+125
Note:
Although this incorporates electrostatic protection circuit, user urged avoid subjecting circuit extremely high static electricity voltage excess performance.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Electrical Characteristics
Note: data specifications based measured results using recommended peripheral parts (see Recommended Peripheral Parts). Common
(Unless otherwise specified: TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Input voltage Mode current consumption full oscillation
VBAT IMC11 Current flowing from power supply VBAT. Only regulator resistance externally. Maximum setting electric volume. Output voltage DC/DC each setting value 0.9. CONT1 CONT3 pulled resistor.
Mode current consumption stopped oscillation
IMC12
Current flowing from power supply VBAT. Only regulator resistance externally. Maximum setting electric volume. Output voltage DC/DC each setting value 1.2. CONT1 CONT3 pulled resistor.
Mode current consumption
IMC2
Current flowing from power supply VBAT. Only regulator resistance externally. Output voltage DC/DC CONT1 CONT3 pulled resistor.
Mode current consumption
IMC3
Current flowing from power supply VBAT. Only regulator resistance externally. Output voltage DC/DC CONT1 CONT3 pulled resistor.
MC1, MC2, VDIN, VCLK, VSTR_B input voltage
Oscillator Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Oscillation frequency Duty ratio
fOSC Duty
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Generation Step-Up Type DC/DC Part
(Unless otherwise specified: VBAT=3.0 TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage
VOUT11
Electric volume maximum, IOUT1
S-8335A240FT, VREGTO 2.325 S-8335A200FT, VREGTO 2.144 S-8335A160FT, VREGTO 1.952 S-8335A120FT, VREGTO 1.739
16.180 14.918 13.582 12.098 8.688 8.011 7.293 6.496
16.590 15.300 13.930 12.410 8.910 8.220 7.480 6.660
17.009 15.683 14.278 12.718 9.134 8.422 7.667 6.829
Output voltage
VOUT12
Electric volume minimum, IOUT1
S-8335A240FT, VREGTO 2.325 S-8335A200FT, VREGTO 2.144 S-8335A160FT, VREGTO 1.952 S-8335A120FT, VREGTO 1.739
Switching current Switching transistor leakage current VOUT1 input current VOUT1 sink current Soft start time
ISWP ISWQP
VCONT1 mode (25°C) mode (70°C)
IVOUT1 IVOUT1L
electric volume minimum Mode VOUT1 Time until error amplifier reference voltage reaches final value regulator output voltage. CRT1= CSS= 0.01 Electric volume middle, IOUT1
Efficiency
EFFIP
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC Electric Volume Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Electric volume adjustment range
VOUT
S-8335A240FT, VREGTO 2.325 S-8335A200FT, VREGTO 2.144 S-8335A160FT, VREGTO 1.952 S-8335A120FT, VREGTO 1.739
8.91±2.5% 8.22±2.5% 7.48±2.5% 6.66±2.5%
16.59±2.5% 15.30±2.5% 13.93±2.5% 12.41±2.5%
Potential division precision Electric volume resolution Linearity error Data setup time Data hold time VCLK pulse width VCLK period VCLK VSTR_B VSTR_B pulse width VSTR_B VCLK
1/63
4.17 8.33
VDIN VCLK
next
VSTR_B
Figure Clock Timing
VDIN
VCLK
VSTR_B
State Data Data Load data shift register Load shift register contents latch Hold latch data
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Generation Inverter Type DC/DC Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Comparator offset EXT2 output current
VQEROF IEXT2H IEXT2L
1.45 VEXT2 VBAT VEXT2 Electric volume middle, IOUT2
-5.3
-7.6
10.5
Efficiency
EFFIQ
Step-up Type DC/DC Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage Switching current Switching transistor leak current VOUT3 current Efficiency
VOUT3 ISWU ISWQU IVOUT3L EFFIU
fixed VREFU 2.90 IOUT3 VCONT3 Mode Mode VOUT3 Electric volume middle, IOUT3
2.97
3.05
3.12
Amplifier Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage Output voltage Current consumption sink current
VXO2 ISSX IVXOL
IOUTX VREFU 2.90 output
2.828
0.08
2.90
2.973
0.66
Mode
0.46
Amplifier Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage precision sink current
VYOD IVYOL
(VXO-VYO)/VYO, load IOUTX Mode
0.98 0.46
1.02
0.66
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Regulator Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage Output voltage temperature coefficient VREGSO sink current
VREGSO
IOUTS TOPR -20°C +70°C (when RS1, temperature characteristics taken into account) Mode VREGSO
1.576
1.624
ppm/°C
VREGSO /(VREGSO TOPR)
IVREGSOL
0.40
0.57
Regulator Part
(Unless otherwise specified: VBAT TOPR 25°C) Item Symbol Conditions Min. Typ. Max. Unit Measurement Circuit
Output voltage
VREGTO
fixed VREGSO IOUTT=50 RT1, values, Recommended Peripheral Parts.
S-8335A240FT S-8335A200FT S-8335A160FT S-8335A120FT
2.290 2.112 1.923 1.713 0.46
2.325 2.14 1.95 1.74 0.65
2.360 2.176 1.981 1.765
VREGTO sink current
IVREGTOL
Mode VREGSO
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series Recommended Peripheral Parts (When VICON=1.6
Part MOSFET MOSFET MOSFET MOSFET CREFU CR1, CRS1 CRT1 CVBAT1 CVBAT2 CMC1, CMC2, CMC3 CDIN, CCLK, CSTR_B 2200 0.01 0.01
Value
Unit
Model CDRH5D18-151 MA720
Remark Manufactured Sumida Electric Co., Ltd. Manufactured Matsushita Electric Components Co., Ltd. (Schottky type) Ceramic type Ceramic type Tantalum type MOSFET manufactured MOSFET manufactured Toyoda Automatic Loom Works, Ltd. MOSFET manufactured MOSFET manufactured ROHM Ceramic type Ceramic type Ceramic type Ceramic type Ceramic type Ceramic type Ceramic type Ceramic type (capacitance added only when regulator oscillates)
CM316W5R225K25A CM316W5R225K25A F930J106MA 2SJ356 TM5211 2SJ463A 2SK3019 CM21B105K10A CM21B105K10A CM21B105K10A CM21B105K10A CM105W5R222M10A CM105W5R103M10A CM105W5R103K25A
CM105W5R104M10A CM105Y5V105Z10A CM105Y5V105Z10A CM105Y5V104Z10A CM105Y5V105Z10A
Ceramic type Ceramic type Ceramic type Ceramic type Ceramic type ±0.5% precision (100 110) replaced thermistor. Ishizuka Electronics Corporation thermistor 104HT (100
when S-8335A240FT (Use when S-8335A200FT (Use when S-8335A160FT (Use when S-8335A120FT (Use when
Note regulator input (reference voltage generation circuit output) voltage been trimmed when shipped. Also, external resistance recommended peripheral parts have been that VICON=1.6 When VICON value other than used, select resistance values match VICON voltage used. Also change values same time, because values selected based VICON=1.6 Note CRS1 usually necessary. capacitance only when regulator oscillating. Evaluate actual device using capacitance value order Note output voltage precision does include external resistance dispersion. Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Measurement Circuits
CREFU CRT1 VOUT3 VREFU CVBAT1 CVBAT2
CRS1
VOUT1 VDIN VCLK VSTR_B
VQERR VEXT2
VBAT VDDX
CREFU CRT1 CRS1 VDIN VCLK VSTR_B VBAT CVBAT1 CVBAT2 VREFU
Figure Measurement Circuits
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Operation
S-8335 Series step-up type inverter type CMOS on-chip switching regulators. These switching regulators employ pulse frequency modulation (PFM) method provide current consumption features. Operation Overview output reference voltage generation circuit input regulator output regulator input regulator After extremely steep rise been blunted low-pass filter, output regulator becomes DC/DC reference voltage. DC/DC output (pin name: VOUT1) that controlled electric volume obtained based this reference voltage. DC/DC output becomes common driver positive power supply (VRH). divided internal resistors becomes input amplifier output (pin name: VXO) amplifier becomes segment driver positive power supply (VCH). Also, input voltage amplifier becomes reference voltage DC/DC error amplifier. DC/DC output (pin name: VOUT3) obtained that becomes 1.05 times larger than this reference voltage. DC/DC output voltage used amplifier power supply voltage. divided internal resistors becomes input amplifier output (pin name: VYO) amplifier becomes segment driver intermediate potential (VM). becomes reference voltage DC/DC error amplifier. DC/DC oscillates obtained that common driver negative power supply (VRL) symmetric around
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Step-up type switching regulators (DC/DC DC/DC
IOUT VOUT
CONT Mode control
VOUT
COUT
DC/DC variable resistance controlled electric volume. Figure DC/DC DC/DC fundamental equations {(1) (7)} step-up type regulators shown below (see Figure CONT voltage (VA) immediately after turned (IL, which current that flows zero):
(VS: Unsaturated voltage
Change with time:
Result integrating above equation (IL):
current flows during time tON. This time (tON) determined according oscillation frequency OSC. Peak current (IPK) after tON:
energy stored this time represented 1/2L(IPK)2. Next, when turned (tOFF), energy stored emitted through diode, counter voltage (VL) generated. Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
(VOUT
(VD: Diode forward voltage) CONT voltage rises voltage corresponding VOUT Change with time current (IL) that flows VOUT through diode during time tOFF:
VOUT
Result integrating above equation:
VOUT
During tON, energy stored transmitted VOUT. When output current (IOUT) flows from VOUT, capacitor (COUT) energy used. result, COUT voltage decreases reaches lowest value after time tON. When turned off, energy stored transmitted through diode COUT, COUT voltage rises dramatically. VOUT time function that indicates maximum value (ripple voltage: VP-P) when current flowing through diode VOUT matches load current IOUT. This ripple voltage value calculated below. IOUT when time from immediately after until VOUT reaches highest level
VOUT IOUT
(IPK IOUT
VOUT
Since IL=0 time tOFF (when inductor energy emitted), following obtained from equation (7):
tOFF VOUT
(10)
following obtained substituting equation (10) into equation (9):
IOUT tOFF tOFF
(11)
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
amount electric charge charged COUT during time
VOUT
VOUT
(12)
following obtained substituting equation into equation (12)
(IPK IOUT IOUT
(13)
voltage rise (VP-P) follows:
IOUT COUT COUT
VP-P
(14)
following obtained when IOUT consumed during time RESR, which Electric Series Resistance (ESR) COUT, taken into consideration:
IOUT IOUT IOUT RESR COUT COUT COUT
VP-P
(15)
following obtained when equation (11) substituted into equation (15):
VP-P
(IPK IOUT
2IPK
tOFF IOUT RESR COUT
(16)
Effective ways reduce ripple voltage increase capacitance capacitor connected output reduce ESR. Note: Although this on-chip soft-start circuit, rush current flows because output capacitor (COUT) load capacitance component charged coil diode power application. Therefore, care must taken.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Inverter type switching regulator (DC/DC fundamental equations inverter type regulator shown below. Point voltage immediately after turned (IL, which current that flows zero):
(17)
(VS: Unsaturated voltage Change with time:
IOUT -VOUT COUT
(18) Figure Inverter Type Switching Regulator
Result integrating above equation (IL):
(19)
current flows during time tON. This time (tON) determined according oscillation frequency OSC. Peak current (IPK) after tON:
(20)
energy stored this time represented 1/2L(IPK)2. Next, when turned off, energy stored emitted through groundcapacitordiode (Di), counter voltage (VL) generated same time.
(VOUT
(21)
(VD: Diode forward voltage) Change with time current (IL) that flows -VOUT through capacitor during time tOFF:
VOUT
(22)
Result integrating above equation:
VOUT
(23)
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
During tON, energy stored transmitted -VOUT. When output current (IOUT) flows from -VOUT, capacitor (COUT) energy used. result, COUT voltage decreases reaches lowest value after time tON. When turned off, energy stored transmitted through diode COUT, COUT voltage rises dramatically. VOUT time function that indicates maximum value (ripple voltage: VP-P) when current flowing through diode VOUT matches load current IOUT. This ripple voltage value calculated below. IOUT when time from immediately after until VOUT reaches highest level
VOUT IOUT
(24) (25)
(IPK IOUT
VOUT
Since IL=0 time tOFF (when inductor energy emitted), following obtained from equation (23):
tOFF VOUT
(26)
following obtained substituting equation (26) into equation (25):
IOUT tOFF tOFF
(27)
amount electric charge charged COUT during time
IOUT
VOUT
VOUT
(28)
following obtained substituting equation (25) into equation (28)
(IPK IOUT IOUT
(29)
voltage rise (VP-P) follows:
COUT COUT IOUT
VP-P
(30)
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
following obtained when IOUT consumed during time taken into consideration:
IOUT IOUT COUT COUT COUT
VP-P
(31)
following obtained when equation (27) substituted into equation (31):
VP-P
(IPK IOUT
2IPK
tOFF COUT
(32)
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Operation Modes Mode Control
mode switched among modes according 2-bit input from pins signal. signal input this signal required external part control. This signal should supplied from driver controller. Since pins pulled pulled down internally, they should floating state. Also, note that current consumption standby mode exceed there potential difference between supply voltage supply voltage S-8335 Series
MC3* Operation Mode Mode (Normal operation) Mode (Icon mode) Mode (Standby mode)
Remark: level, High level, Don't care signal that input external switch forcibly discharge capacitor modes
Normal operation mode (MC1=L, MC2=L, MC3=H) Step-up operation performed. Icon mode (MC1=L, MC2=H, MC3=L) Only reference voltage circuit regulator operate. regulator output VREGSO arbitrarily range from using external resistors RS2. VREGSO used icon voltage. value that matches temperature characteristics panel combining series parallel resistor with thermistor necessary. section regulator information about output voltage characteristics regulator when output current drawn. Standby mode (MC1=H, MC3=L) operation internal circuits shut down. current consumption does exceed When high ("H" level), operation internal circuits stops, current consumption dramatically reduced. same time, VOUT1, VXO, VYO, VREGSO, VREGTO pins each short-circuited on-chip transistors. (However, data that written register electric volume part retained voltage least applied between VBAT pins.) Since current flows this time from VOUT1 through coil diode input side, switch shutting down current required. Figure shows sample circuit that uses NEC's 2SJ356 (Pch MOSFET) current breaker switch. this sample circuit, small signal transistor (Nch MOSFET) used turn 2SJ356 inputting control signal gate transistor invalid current flowing resistor during step-up operation affect efficiency. Resistor should high resistance value reduce current. However, resistance value high, voltage drop across resistor will occur off-leak current small signal transistor 2SJ356 current breaker switch turn off. Therefore, care must taken. Note: efficiency characteristics shown reference data, which were measured without current breaker switch, differ from efficiency this sample circuit.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
CONT1 VOUT1 VBAT RESET
2SJ356
RA1:
RA2:
Figure Sample Circuit Which 2SJ356 Used When mode (standby mode) canceled, mode returns that effect before switching standby mode. example, entered mode from mode will return mode when mode canceled. Note
Standby Current [µA] VBAT
there potential difference between applied voltage power supply voltage S8335 Series, current consumption standby mode exceed example, when applied voltage power supply voltage S-8335 Series current consumption standby mode rises approximately 25°C (typ.) (see Figure reason this occurs that penetrating current flows CMOS logic circuits because potential input signals (3.0 lower than internal logic power supply voltage (5.0 Therefore, this such that potential difference occurs between applied voltage power supply voltage S-8335 Series.
VMC1
Figure Standby Mode Current Characteristics
MC2)
Note penetrating current from VBAT flows when mode switched. When MC2) "H", current approximately flows from VBAT through coil diode transistor because VOUT1 short-circuited level. Also, when MC2) "L", short-circuited transistor current approximately flows. reduce penetrating current, MC2) signals should both switched same time when modes switched. this cannot done, avoid state which MC2) signals both ("L" level) same time order reduce penetrating current (see Figure Seiko Instruments Inc.
Normal mode
Standby mode icon mode)
Normal mode
Figure Mode Switching
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Electric volume
VDIN VCLK RESET
VSTR_B
6-bit shift register
VDIN
(MSB)
(LSB)
VCLK VSTR_B Hold Reset VOUT Electric volume VOUT min. value Read Setting value Hold
6-bit latch
Figure Block Diagram Clock Timing Electric Volume Part VDIN: This data input electric volume. "Data input level, "data input level. high impedance state prohibited.) When data sent, keep VDIN level. This clock input electric volume. data VDIN fetched shift register clock rising edge. When clock with more than bits data input, data that been read sequentially shifted each clock pulse, last bits data become effective.
Output voltage
VCLK:
±1/2
VSTR_B: This strobe signal input pin. When strobe signal goes (set level), shift register contents fetched latch. data that fetched latch sent directly electric volume, consequently output voltage changes. When strobe signal goes high (set level), latch data held.
±1/2
Electric volume data (DEC)
Figure Linearity Error
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
electric volume 6-bit resolution. integral differential linearity errors ±0.5LSB. example, want output voltage range vary between 8.91 16.59 obtain linearity precision selecting S-8335A240FT. Since register contents undefined when power turned they must reset. Even high ("H" level) signal ("L" level) step-up operation stops, electric volume register contents retained voltage least applied between VBAT pins. Register "WRITE" "RESET" operations also available this state. register initialized "000000" output voltage minimum value setting VCLK VSTR_B "L". Turn power with "L". Then initialize register contents setting VCLK VSTR_B="L" begin step-up operation switching pins ("L" level) signal high ("H" level).
Caution: step-up operation started without initializing data register after turning power, maximum output voltage appear VOUT pins connected devices instruments damaged. recommended connect pull-down resistor between external part pins that signal enters connect pull-up resistor between VBAT. Note: there potential difference between applied voltage VDIN, VCLK, VSTR_B power supply voltage S-8335 Series, current consumption standby mode exceed example, when applied voltage VDIN, VCLK, VSTR_B power supply voltage S-8335 Series current consumption standby mode rises approximately 25°C (typ.) (see Figure 11). reason this occurs that penetrating current flows CMOS logic circuits because potential input signals VDIN, VCLK, VSTR_B (3.0 lower than internal logic power supply voltage (5.0 similar situation occurs power supply voltage (see Note Mode Control section).
Standby current [µA] VBAT VDIN
Figure Standby Mode Current Characteristics
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
amplifier
power supply voltage amplifier generated using DC/DC that approximately 1.05 times larger than output voltage amplifier Since difference between power supply voltage output voltage kept small, power loss extremely small efficiency increased. Figure shows output voltage amplifier when source current drawn.
dot,25°C VBAT =3.0V
EV=MIN EV=MID EV=MAX
1000 1500 2000 SOURCE CURRENT, IOUTX[µA]
Figure Amplifier Output Voltage
amplifier
VBAT used power supply voltage amplifier Figures show output voltage amplifier when source current sink current drawn, respectively.
dot,25 VBAT=3.0V 1000 EV=MIN EV=MID EV=MAX 1500 IOUTY [µA] 2000
EV=MIN EV=MID EV=MAX -1000 -1500 IOUTY [µA] -2000
dot,25 VBAT=3.0V -500
SOURCE CURRENT,
SINK CURRENT,
Figure Source Current Characteristics
Figure Sink Current Characteristics
Regulator Part
VBAT used power supply voltage regulator part. regulator output VREGSO arbitrarily range from using external resistor RS2. VREGSO used icon voltage. value that matches temperature characteristics panel combining series parallel resistor with thermistor necessary. Also, CRS1 capacitor preventing oscillation. required only when regulator oscillates. Adjust CRS1 value when values changed. Using actual device, confirm that regulator does oscillate. Figure shows voltage VREGSO when current drawn.
1.58 1.56 1.54 1.52 1.48 1.46
VREGSO
VBAT=2.4V VBAT=3.0V VBAT=5.0V 1000 IOUT 1500 2000
Figure VREGSO Characteristics
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Regulator Part
VREGTO
VBAT used power supply voltage regulator part. regulator output VREGTO using external resistance RT2. VREGTO match voltage range that used. common-driver voltage VRH_max obtained VREGTO 7.136, VRH_min obtained VREGTO 3.832. Figure shows voltage VREGTO when current drawn.
2.35 2.25 2.15 2.05
VBAT=2.4V VBAT=3.0V VBAT=5.0V 1000 IOUT 1500 2000
Figure VREGTO Characteristics
Power Supply Rising Edge Sequence
power supply rising edge sequence VRH, VCH, VRL. falling edge sequence VRL, VCH, VRH. (See Figure 17.)
V/div V/div V/div V/div ms/div
Figure Rising Falling Edge Sequences
Soft Start
soft-start function blunts rising edge reference voltage VREGTO using external capacitor internal resistor that rush current reduced some degree corresponding this moderated ascent. However, note that this complete soft start because switching regulators S-8335 Series control.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Selection External Parts
Inductor inductance value significantly affects maximum output current IOUT efficiency (EFFI). Figure shows graphs dependency IOUT EFFI S-8335 Series inductance value
DC-DC (VOUT 16.6 VBAT IOUT IOUT EFFIP EFFIP
DC-DC VOUT=16.6 VBAT=3.0 IOUT IOUT EFFIQ EFFIQ
value (µH)
Recommended range
value (µH)
Recommended range
DC-DC (VOUT 3.99 VBAT IOUT IOUT EFFIU EFFIU
Recommended range
value (µH)
Figure Dependency IOUT EFFI Inductance Value value decreases, peak current increases, IOUT reaches maximum certain value. value decreases further, current driving capability switching transistor becomes insufficient, IOUT reduced. Also, value increases, power loss switching transistor decreases, efficiency reaches maximum certain value. value increases further, power loss series resistance coil increases, efficiency reduced. recommended inductance value DC/DC DC/DC DC/DC
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
When select inductors, attention permissible current inductors. current that exceeds permissible current flows inductor, magnetic saturation will occur inductor. This cause significant decrease efficiency damage excessive current. Therefore, select inductors that peak current does exceed permissible current. peak current non-continuous mode given following equation.
2IOUT VOUT fOSC
(33)
where fOSC oscillation frequency. approximately example, assume that output voltage VOUT 16.6 with load current IOUT 2mA, using S-8335A240FT with input voltage fOSC kHz. selected value, then from equation (33). Therefore, inductor having permissible current least value should selected. Diode off-chip diode must satisfy following conditions. forward voltage: Fast switching speed: max. Reverse breakdown voltage: VOUT+VF more Rated current: more
Capacitors (CVBAT, input capacitor (CVBAT) improve efficiency decreasing power supply impedance stabilizing input current. Select capacitor value according impedance power supply used. Connect capacitor least each power supply pins. output capacitor (CL), capacitor having small Electric Series Resistance (ESR) large capacitance stabilize ripple voltage. Standard capacitor values least least CL3. particular, tantalum electrolytic capacitor having excellent temperature characteristics leakage current characteristics should used. capacitor having large capacitance produces more stable output leads higher efficiency.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Standard Circuits
CONT1
VSTR_B VOUT1 CONT3
CVBAT1
VDIN
VCLK
RESET
CVBAT2 VBAT
DC/DC
control circuit
Electric volume
VOUT3
DC/DC
control circuit
DC/DC
CMC1 CMC2
control circuit
Mode control circuit Reference voltage generation circuit
VQERR VREFU CREFU
Oscillator
op-amp
VDDX
VREGSF VREGSO VREGTF VREGTO
EXT2
op-amp
CRS1 VICON
VBAT
CRT1
small current VSS,
large current
Figure Standard Circuits Except op-amp power internal circuits S-8335 Series supplied VBAT pin.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Pattern Diagram
general, switching regulator significantly affected circuit board wiring. following figure shows sample pattern diagram which effect circuit board wiring small.
Figure Pattern Diagram Note following points when creating pattern diagram. There lines (connected inside IC). (pin Large current (pin 17): Small current (analog) middle current Arrange line capacitors first. CVBAT, CL1, CL2, particularly important. Draw line wide possible. Basically, make part circuit board broad possible keep impedance low. There VBAT lines (not connected inside IC). VBAT (pin 12): Reference (low noise) VBAT (pin 16): others (semi-low noise) Connect both (VDDX) (VOUT3) possible (for example, connect each pin). through holes locations connecting CL3. Increasing makes output more stable. DC/DC output fluctuates ripple, this causes VQERR frequently exceed DC/DC error amplifier threshold value, then DC/DC oscillates more than necessary DC/DC efficiency will decrease. Therefore, stabilizing DC/DC output will also improve DC/DC efficiency. Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
Application Circuit
CONT1 VBAT
VSTR_B CONT3 VOUT1 VOUT3
CVBAT1
VDIN
VCLK
VBAT
VDDX
VQERR
CVBAT2 VBAT
S-8335
VREFU
CREFU
EXT2
CMC1 CMC2
VREGSF VREGSO VREGTF VREGTO
Segment driver
Common driver
CRS1 VICON
VBAT
CRT1
small current VSS,
large current
Figure Application Circuit Example
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Precautions
Mount external capacitors, diodes, coils, other components close possible RS1, RS2, RT1, values recommended peripheral parts VICON VICON value other than used, resistance values should changed. output voltage precision does include external resistance dispersion. Characteristic ripple voltage spike noise occur switching regulator. Since these significantly affected coil capacitor that used, evaluate them using actual devices when circuit designed. contribute stability VQERR potential increase efficiency switching regulator Although capacitance value range from 1000 0.01 recommended CR2, should evaluate this value using actual device. Make sure that operating ambient temperature range this exceeded switching transistor power dissipation (particularly high temperature).
1000 Ambient temperature TOPR (°C)
Figure Power Dissipation 24-pin TSSOP Package (Unmounted) Arrange parts that line (indicated bold line Figure short possible. this line resistance inductance components, potential will fluctuate switching current. potential difference produced between malfunction occur interface, electric volume reset.
Power dissipation (mW)
VDIN VCLK
CONT
VOUT
S-8335
VSTR_B
Figure Line Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
When switching output voltage electric volume, soft start does function. Note that overshoot will occur when output voltage increases large amount. When internal impedance power supply (VBAT) large, S-8335 Series start Make sure that internal impedance power supply used sufficiently small when using this Make sure that potential VOUT1 does exceed which absolute maximum rating, when using this Make capacitance VDIN, VCLK, VSTR_B large enough prevent noise malfunctions. Seiko Instruments Inc. shall bear responsibility patent infringement product that includes manufactured Seiko Instruments Inc. relation method using this that product, product specifications, destination country.
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Characteristic Curves
Common characteristics (Unless otherwise specified, these graphs show typical data TOPR 25°C.)
Current consumption (for mode when oscillation stopped)
IMC12 [µA]
Current consumption (for mode with full oscillation)
IMC11 [µA]
VBAT
VBAT
Current consumption (mode
IMC2 [µA]
Current consumption (mode
IMC3 [µA]
VBAT
VBAT
amplifier part current consumption
8.95 8.85 8.75 8.65 8.55 VBAT
sink current
0.72 0.71 0.69 0.68 0.67 0.66 0.65 0.64 0.63 0.62
ISSX [µA]
IVXOL [µA]
VBAT
sink current
0.66 0.65 0.64
IVYOL [µA]
0.63 0.62 0.61 0.59 VBAT
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part switching current
ISWP [mA]
DC/DC part switching transistor leakage current
0.02 0.016 ISWQP [µA] 0.012 0.008 0.004
VBAT
VBAT
DC/DC part comparator offset voltage
VQEROF [mV] -1.5 -0.5
EXT2 current (IEXT2H)
IEXT2H [mA]
VBAT
VBAT
EXT2 current (IEXT2L)
DC/DC part switching current
ISWU [mA]
IEXT2L [mA]
VBAT
VBAT
DC/DC part switching transistor leakage current
0.01 0.008
VOUT3 current
IVOUT3L [µA]
ISWQU [µA]
0.006 0.004 0.002 VBAT
VBAT
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
Regulator part output voltage (vs. VBAT)
1.5995
VREGSO
Regulator part output voltage (vs. IOUT)
1.58 VREGSO 1.56 1.54 1.52 1.48 1.46 VBAT=2.4V VBAT=3.0V VBAT=5.0V 1000 IOUT [µA] 1500 2000
1.599 1.5985 1.598 1.5975 1.597 VBAT
VREGSO sink current
IVREGSOL [mA]
VREGTO sink current
IVREGTOL [mA]
VBAT
VBAT
MC1, high level voltage
MC1, level voltage
0.598
VBAT
0.596 0.594 0.592 0.59 VBAT
Soft start time
[ms]
VBAT
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
S-8335A240FT (1/240 duty. Unless otherwise specified, these graphs show typical data TOPR 25°C.)
amplifier part output voltage (VBAT
amplifier part output voltage (VBAT
1000
EV=MIN EV=MID EV=MAX 1000 1500 IOUTX [µA] 2000
EV=MIN EV=MID EV=MAX 1500 2000
SOURCE CURRENT, IOUTX [µA]
SOURCE CURRENT,
amplifier part output voltage (vs. source current, VBAT
1000 1500 2000 SOURCE CURRENT, IOUTY [µA] EV=MIN EV=MID EV=MAX
amplifier part output voltage (vs. source current, VBAT
EV=MIN EV=MID EV=MAX 1000 SOURCE CURRENT, 1500 IOUTY [µA] 2000
amplifier part output voltage (vs. sink current, VBAT
EV=MIN EV=MID EV=MAX -500 -1000 -1500 -2000
amplifier part output voltage (vs. sink current, VBAT
EV=MIN EV=MID EV=MAX
-500 -1000 -1500 SINK CURRENT, IOUTY [µA] -2000
SINK CURRENT, IOUTY [µA]
Regulator part output voltage
2.35
VREGTO
2.25 2.15 2.05 VBAT=2.4V VBAT=3.0V VBAT=5.0V 1000 IOUT [µA] 1500 2000
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
DC/DC part output voltage
VOUT1
VBAT=2.4V VBAT=3V VBAT=5V Point
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIP
1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX 1500 2000
Ripple [mV]
EFFIP[%]
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
EFFIP
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
Ripple [mV]
EV=MIN EV=MID EV=MAX 1500 2000
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part output voltage
VOUT2
VBAT=3V Point
DC/DC part output efficiency (VBAT
EFFIQ
DC/DC part output ripple voltage
(VBAT reference value)
Ripple [mV] EV=MIN EV=MID EV=MAX 1000 IOUT [µA] 1500 2000
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
DC/DC part output efficiency (VBAT
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
Ripple [mV]
EFFIQ[%]
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV] 1000 IOUT [µA] 1500 2000
EV=MIN EV=MID EV=MAX
EFFIQ[%]
EV=MIN EV=MID EV=MAX 1500 2000
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
DC/DC part output voltage (VBAT
IOUTX [µA]
DC/DC part output voltage (VBAT
IOUTX [µA]
VOUT3
EV=MIN EV=MID EV=MAX 1000
VOUT3
EV=MIN EV=MID EV=MAX 1000
DC/DC part output voltage (VBAT
VOUT3
DC/DC part output voltage Min.)
VOUT3
IOUTX [µA] 1000 EV=MIN EV=MID EV=MAX
IOUTX [µA] 1000 VBAT=2.4V VBAT=3V VBAT=5V
DC/DC part output voltage Mid.)
VOUT3
DC/DC part output voltage Max.)
VOUT3
IOUTX [µA] 1000 VBAT=2.4V VBAT=3V VBAT=5V
IOUTX [µA] 1000 VBAT=2.4V VBAT=3V VBAT=5V
DC/DC part output voltage (VBAT VREFU 2.90
3.06 3.055
VOUT3
3.05 3.045 3.04 Point
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX
Ripple [mV]
EFFIU[%]
EV=MIN EV=MID EV=MAX
1500
2000
1500
2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
Ripple [mV]
EFFIU[%]
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX
EV=MIN EV=MID EV=MAX
1500
2000
1500
2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX
Ripple [mV]
EFFIU[%]
EV=MIN EV=MID EV=MAX
1500
2000
1500
2000
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
S-8335A200FT (1/200 duty. Unless otherwise specified, these graphs show typical data TOPR 25°C.)
DC/DC part output voltage
Point
DC/DC part output voltage
VOUT1
Point VBAT=3V
VOUT2
VBAT=3V
DC/DC part output voltage (VREFU 2.91
VOUT3
amplifier part output voltage (vs. source current, VBAT
1000 SOURCE CURRENT,
VBAT=3V Point VBAT=5V
VREFU=2.91V
EV=MIN EV=MID EV=MAX 1500 IOUTX [µA] 2000
amplifier part output voltage (vs. source current, VBAT
amplifier part output voltage (vs. sink current, VBAT
1000 SOURCE CURRENT, EV=MIN EV=MID EV=MAX 1500 IOUTY [µA] 2000
-500 -1000
EV=MIN EV=MID EV=MAX
-1500 -2000
SINK CURRENT,
IOUTY [µA]
Regulator part output voltage (VBAT
2.12 VREGTO 2.08 2.06 2.04 2.02 1000 IOUT [µA] 1500 2000
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV] EV=MIN EV=MID EV=MAX 1000 IOUT [µA] 1500 2000
EFFIP
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIQ
1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIU[%]
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX
1500
2000
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
S-8335A160FT (1/160 duty. Unless otherwise specified, these graphs show typical data TOPR 25°C.)
DC/DC part output voltage
VOUT2
DC/DC part output voltage
VOUT1
Point
VBAT=3V
VBAT=3V
Point
DC/DC part output voltage (VREFU 2.906
VOUT3
amplifier part output voltage (vs. source current, VBAT
VREFU=2.906V VBAT=3V VBAT=5V
Point
EV=MIN EV=MID EV=MAX 1000 SOURCE CURRENT, 1500 IOUTX [µA] 2000
amplifier part output voltage (vs. source current, VBAT
amplifier part output voltage (vs. sink current, VBAT
EV=MIN 1000 SOURCE CURRENT, 1500 IOUTY [µA] 2000 EV=MID EV=MAX
EV=MIN
-500 -1000 -1500 SINK CURRENT, IOUTX [µA] -2000
EV=MID EV=MAX
Regulator part output voltage (VBAT
1.93 1.92 1.91 1.89 1.88 1.87 1.86 1.85 1.84 1.83 1000 IOUT [µA] 1500 2000
VREGTO
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
2000 1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
EV=MIN EV=MID EV=MAX 1500
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
Ripple [mV]
EFFIP[%]
EFFIQ[%]
1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIU
1000 IOUT [µA] 1500
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
EV=MIN EV=MID EV=MAX
2000
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STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR Rev.6.0_01 S-8335 Series
S-8335A120FT (1/120 duty. Unless otherwise specified, these graphs show typical data TOPR 25°C.)
DC/DC part output voltage
VOUT2 VBAT=3V Point
DC/DC part output voltage
VOUT1
Point VBAT=3V
DC/DC part output voltage (VREFU 2.92
VOUT3
amplifier part output voltage (vs. source current, VBAT
1000 SOURCE CURRENT,
Point
VBAT=5V
VBAT=3V
EV=MIN EV=MID EV=MAX 1500 IOUTX [µA] 2000
amplifier part output voltage (vs. source current, VBAT
amplifier part output voltage (vs. sink current, VBAT
1000 1500 IOUTY [µA] 2000 SOURCE CURRENT, EV=MIN EV=MID EV=MAX
-500 -1000
EV=MIN EV=MID EV=MAX
-1500 -2000
SINK CURRENT,
IOUTY [µA]
Regulator part output voltage (VBAT
1.73 1.72 1.71 1.69 1.68 1.67 1.66 1.65 1.64 1000 IOUT [µA] 1500 2000
VREGTO
Seiko Instruments Inc.
STEP-UP, BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR S-8335 Series
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX 1500 2000
Ripple [mV]
EFFIP[%]
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
1000 IOUT [µA]
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIQ
1000 IOUT [µA] EV=MIN EV=MID EV=MAX 1500 2000
EV=MIN EV=MID EV=MAX 1500 2000
DC/DC part output efficiency (VBAT
DC/DC part output ripple voltage (VBAT reference value)
Ripple [mV]
EFFIU[%]
1000 IOUT [µA] 1500 2000 EV=MIN EV=MID EV=MAX
1000 IOUT [µA]
EV=MIN EV=MID EV=MAX
1500
2000
Seiko Instruments Inc.
7.9±0.2
0.17±0.05
0.65
0.22±0.1
FT024-A-P-SD-1.0
TITLE SCALE UNIT
TSSOP24-A-PKG Dimensions FT024-A-P-SD-1.0
Seiko Instruments Inc.
+0.1
2.0±0.1
4.0±0.1
0.3±0.05
12.0±0.1
1.5±0.1
4.2±0.2
-0.2
+0.4
Feed direction
FT024-A-C-SD-1.0
TITLE SCALE UNIT
TSSOP24-A-Carrier Tape FT024-A-C-SD-1.0
Seiko Instruments Inc.
21.4±1.0
17.4±1.0
17.4 -1.5
+2.0
Enlarged drawing central part 2.0±0.5
FT024-A-R-SD-1.0
TITLE SCALE UNIT
TSSOP24-A-Reel FT024-A-R-SD-1.0
QTY. 2,000
Seiko Instruments Inc.
information described herein subject change without notice. Seiko Instruments Inc. responsible problems caused circuits diagrams described herein whose related industrial properties, patents, other rights belong third parties. application circuit examples explain typical applications products, guarantee success specific mass-production design. When products described herein regulated products subject Wassenaar Arrangement other agreements, they exported without authorization from appropriate governmental authority. information described herein other purposes and/or reproduction copying without express permission Seiko Instruments Inc. strictly prohibited. products described herein cannot used part device equipment affecting human body, such exercise equipment, medical equipment, security systems, equipment, apparatus installed airplanes other vehicles, without prior written permission Seiko Instruments Inc. Although Seiko Instruments Inc. exerts greatest possible effort ensure high quality reliability, failure malfunction semiconductor products occur. user these products should therefore give thorough consideration safety design, including redundancy, fire-prevention measures, malfunction prevention, prevent accidents, fires, community damage that ensue.

S-8335 Series S-8335 Series bias supply Multi Line Addressing (ML

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