ASSP Power Supply Applications (Lithium-ion Battery Chargers) Reg
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DS04-27701-1E
ASSP Power Supply Applications (Lithium-ion Battery Chargers)
Regulated, High-Precision DC/DC Converter
MB3832A
DESCRIPTION
MB3832A pulse width modulation (PWM) DC/DC converter incorporating current detector amplifier error amplifiers circuits) control output voltage current independently. suitable downconversion. With on-chip reference voltage generator, MB3832A best suited applications such lithiumion battery (1-cell 3-cell) chargers.
FEATURES
High precision reference voltage source: 0.5% (+25°C) 1.0% (-10°C +85°C) High frequency operating capability: max. Wide operating supply voltage range: On-chip current detector amplifier with wide in-phase input voltage range: On-chip standby function On-chip triangular waveform oscillator capable operating external synchronization On-chip, timer-latch short-circuit protection circuit Internal totem-pole output stage supporting P-channel FETs transistors
PACKAGE
20-pin Plastic SSOP
(FPT-20P-M03)
MB3832A
ASSIGNMENT
(TOP VIEW)
VREF SYNC CSCP -IN1 +IN1 -INC +INC
-IN2 +IN2 COUT
(FPT-20P-M03)
MB3832A
DESCRIPTION
name VREF SYNC CSCP -IN1 +IN1 -INC +INC COUT +IN2 -IN2 Reference voltage output Connection triangular wave frequency setting resistor Connection triangular wave frequency setting capacitor External synchronous signal input Connection time constant setting capacitor timer-latch shortcircuit protection circuit Error amplifier output Error amplifier inverted input Error amplifier non-inverted input Current detector amplifier inverted input Current detector amplifier non-inverted input Ground Current detector amplifier output Error amplifier non-inverted input Error amplifier inverted input Error amplifier output Connection dead time/soft start time setting resistor/capacitor Power supply control input level: Active state level: Standby state Power supply Totem-pole output Connector output sink current setting resistor Descriptions
Input pin, Output
MB3832A
BLOCK DIAGRAM
COUT -IN2 +IN2 -IN1 +IN1 Error Amp.2 Current Amp. Comp.
-INC +INC
Error Amp.1
Comp. bias CSCP Latch UVLO bias Comp.
VREF
SYNC
MB3832A
ABSOLUTE MAXIMUM RATINGS
Parameter Power supply voltage Control input voltage Output current Peak output current Allowable dissipation Storage temperature Symbol VCTL Tstg Condition pin, pin, Duty +25°C Rating Min. Max. 540* +125 Unit
When mounted cm-square dual-sided epoxy base board WARNING: Semiconductor devices permanently damaged application stress (voltage, current, temperature, etc.) excess absolute maximum ratings. exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Reference voltage output current Input voltage Control input voltage SYNC input voltage Output current Oscillatior frequency Timing capacitance Timing resistance Short detection capacitance Operating temperature Symbol Condition +IN1, -IN1, +IN2, -IN2 +INC, -INC VCTL VSYNC fOSC CSCP SYNC pin, Value Min. Typ. Max. 2200 Unit
WARNING: recommended operating conditions required order ensure normal operation semiconductor device. device's electrical characteristics warranted when device operated within these ranges. Always semiconductor devices within their recommended operating condition ranges. Operation outside these ranges adversely affect reliability could result device failure. warranty made with respect uses, operating conditions, combinations represented data sheet. Users considering application outside listed conditions advised contact their FUJITSU representatives beforehand.
MB3832A
ELECTRICAL CHARACTERISTICS
(VCC +25°C) Parameter Symbol Condition +25°C Output voltage Reference voltage block (Ref) Input stability Load stability Short circuit output current Under voltage lockout circuit block (UVLO) Threshold voltage Hysteresis width Reset voltage Detection voltage Threshold voltage Short detection block (SCP Comp, Latch) Input standby voltage Input latch voltage Input source current Oscillator frequency Triangular wave oscillator block (OSC) Frequency input stability SYNC input condition Input current Input offset voltage Input bias current Common mode input voltage range Error amplifier (Error Amp.1, Voltage gain Frequency bandwidth Common mode rejection ratio VREF Line Load VRST VSTB ICSCP fOSC ISYNC CMRR VOM+
Value Min. 2.4875 2.475 2.480 0.65 -1.4 -200 Typ. 2.50 2.50 2.50 0.70 -1.0 750* -120 Max. 2.5125 2.525 2.520 0.75 -0.6
Unit
-10°C +85°C +25°C +85°C IREF VREF CSCP CSCP CSCP CSCP Input level Input level VSYNC
Maximum output voltage width Output source current Output sink current Standard design value
IOM- IOM+
(Continued)
MB3832A
(VCC +25°C) Parameter Input offset voltage Symbol I+INC Input bias current I-INC Output voltage Current detector amplifier block (Current Amp.) Common mode input voltage range Common mode rejection ratio Voltage gain Frequency bandwidth Output resistance Maximum output voltage width Output source current Output sink current Threshold voltage comparator block (PWM Comp.) Input bias current Latch mode input current Input latch voltage duty cycle Standard design value CMRR VOM+
Condition V+INC, V-INC 12.6 V+INC 12.7 V-INC 12.6 V+INC V-INC V+INC 12.7 V-INC 12.6 V+INC 12.8 V-INC 12.6 V+INC V-INC V+INC V-INC V+INC, V-INC 12.6 V-INC 12.6 VCOUT VCOUT Duty cycle Duty cycle VDTC VDTC IDTC VDTC VREF/1.56
Value Min. 2.25 2.25 22.5 -1.0 Typ. 500* -0.2 0.15 Max. 2.75 2.75 27.5
Unit
IOM- IOM+ VT100 IDTC IDTC VDTC
(Continued)
MB3832A
(Continued)
(VCC +25°C) Parameter Output resistance Output sink current Output voltage Output block (OUT) Control-off output resistance ROUT2 input condition Control block (CTL) Input current Standby current General Power supply current VOFF ICCS Symbol ROUT1 Condition -300 VCTL VREF VCTL VREF active state standby state VCTL VCTL VCTL Output Value Min. 12.5 Typ. Max. Unit
MB3832A
TYPICAL CHARACTERISTICS
Reference voltage power supply voltage characteristics
Reference voltage VREF Power supply voltage IREF Reference voltage VREF VREF load current IREF (mA)
Reference voltage VREF load current characteristics
Reference voltage temperature characteristics
Reference voltage VREF -0.5 -1.0 -1.5 -2.0
Temperature (°C)
Reference voltage control voltage characteristics
Reference voltage VREF Control voltage VCTL
Control current control voltage characteristics
Control current ICTL (µA)
IREF
Control voltage VCTL
(Continued)
MB3832A
Triangular wave oscillation frequency resistance characteristics
Triangular wave oscillation frequency fOSC (Hz) Triangular wave oscillation frequency fOSC (Hz)
Triangular wave oscillation frequency capacitance characteristics
2200
resistance
capacitance
Triangular wave oscillation frequency regulation fOSC
-1.0 -2.0 -3.0 Power supply voltage
Triangular wave oscillation frequency fOSC (kHz)
Triangular wave oscillation frequency regulation power supply voltage characteristics
Triangular wave oscillation frequency temperature characteristics
Temperature (°C)
Triangular wave upper down voltage
Triangular wave maximum/minimum voltages triangular wave oscillation frequency characteristics
Upper
Lower
Triangular wave oscillation frequency fOSC (Hz)
(Continued)
MB3832A
Error amp. gain, phase frequency characteristics
gain (dB) -135 -180 phase (14) (13) (15) Amp.1 (Err Amp.2)
Frequency (Hz)
Current detector amp. gain, phase frequency characteristics
Gain (dB) phase (deg) -135 -180 12.6 12.5 Current Amp.
Frequency (Hz)
Current detector amp. output voltage input voltage characteristics
Output voltage VCOUT Inverting input voltage V+INC V-INC
(Continued)
MB3832A
(Continued)
Allowable dissipation ambient temperature characteristics
Allowable dissipation (mW)
Ambient temperature (°C)
MB3832A
FUNCTIONAL DESCRIPTION
Switching Regulator Functions
Reference voltage circuit (Ref) reference voltage generator uses voltage supplied from (pin generate temperaturecompensated, stable voltage (about 2.50 reference supply voltage IC's internal circuitry. reference voltage output, external device through VREF (pin Triangular wave oscillator (OSC) triangular wave oscillator generates triangular waveform with timing capacitor timing resistor respectively connected (pin (pin triangular wave input comparator while also supplied external device through pin. addition, oscillator used external synchronization, where generates triangular wave synchronous input signal from SYNC (pin Error amplifiers (Error Amp. error amplifiers detect output voltage from switching regulator outputs control signal. supports wide range in-phase inputs from "VCC arbitrary loop gain connecting feedback resistor capacitor from (pin [FB2 (pin 15)] -IN1 (pin [-IN2 (pin 14)] error amplifier, enabling stable phase compensation system. Current detector amplifier (Current Amp.) current detector amplifier provides amplification voltage drop between ends output sensor resistor (RS) switching regulator, that occurs flow charging current. same time, amplifier converts voltage GND-reference voltage level outputs COUT (pin 12). also control charging current combination with error amplifier circuit. Power control circuit (CTL) power control circuit control turning power supply through (pin 17). (Supply current standby mode: About Depending voltage level Comp. input pin, (pin become level during discharging VREF voltage after turned with capacitor connected VREF pin. power control circuit contains function fixing output level when VREF "H", preventing inadvertent level output after turning off. comparator circuit (PWM Comp.) comparator circuit voltage-pulse width converter controlling output duty error amplifiers (Error Amp. depending their output voltage. comparator circuit turns external output transistor during interval which triangular wave voltage level lower than voltage level both error amplifier output pins (FB1 (pin (pin 15)) (pin 16). Output circuit (Out) output circuit uses totem-pole configuration, capable driving external P-channel transistor. also control output sink current with resistor connected between (pin (pin 11).
Protection Functions
input voltage malfunction preventive circuit (ULVO) transient state momentary decrease supply voltage, which occurs when power supply turned cause errors control resulting breakdown degradation system. input voltage malfunction preventive circuit detects internal reference voltage level according supply voltage
MB3832A
turn external output transistor make dead time 100%. circuit restores voltage supply when supply voltage reaches threshold voltage. Timer-latch short-circuit protection circuit (SCP Comp., Latch) latch circuit detects output voltage levels error amplifiers. When output voltage levels error amplifiers reach about same time, timer circuit actuated start charging external capacitor connected CSCP (pin error amplifier outputs restored normal voltage range before capacitor voltage reaches about latch circuit actuated output pins (OUT) level. reset actuated protection circuit, turn power supply back.
MB3832A
METHOD SETTING EXTERNAL SYNCHRONOUS OSCILLATION
external synchronous oscillation, connect timing capacitor (CT), timing resistor (RT), external sync signal SYNC pins, respectively. this case, select that oscillation frequency lower than frequency external sync signal excluding setting error oscillation frequency. duty cycle (T1/T) external sync signal must within range from 90%.
<Triangular wave oscillator (OSC) equivalent circuit>
VREF Latch1
level:
SYNC
Latch2
<Free-run oscillation>
VSYNC
<External synchronous oscillation>
VSYNC
VRT/RT, (pin voltage (typical)
MB3832A
TREATMENT UNUSED CSCP
When timer-latch short-circuit protection circuit used, connect CSCP (pin shortest distance. Treatment CSCP when used
CSCP
MB3832A
METHODS SETTING DEAD TIME SOFT START
Dead Time
When device step-up inverted output based flyback method, output transistor fixed full-ON state duty 100%) when power supply turned prevent this problem, determine voltage (pin from VREF voltage output transistor's dead time (maximum ON-duty period) shown Figure below. When voltage (pin higher than triangular wave output voltage from oscillator, output transistor turned off. dead time calculation formula assuming that triangular wave amplitude triangular wave minimum voltage given below. Duty (ON) [%], VREF
When used, connect directly VREF pin. Figure Setting dead time Figure setting dead time
VREF
VREF
Soft Start
prevent surge currents when turned soft start using (pin 16). also soft start along with dead time making connections shown Figure below. Figure Setting soft start Figure Setting dead time soft start
VREF
VREF
MB3832A
EQUIVALE CIRCUIT (CTL, SYNC pin)
SYNC
SYNC
COUT
-INC
+INC
-IN2 Error Amp.2
Current Amp.
MTD20P03HDL
(12.6 0.033
+IN2 Comp. Comp.
Error Amp.1
20.6
0.033 -IN1
+IN1
MBRS130
Comp. bias UVLO
(For load)
0.22
bias Latch
APPLICATION EXAMPLE (Step-down scheme)
MTD20P03HDL: Made Motorola Inc. MBRS130LT3: Made Motorola Inc.
CSCP
0.22
SYNC
VREF
charging current charging current charging current
Charging current setting Synchronous signal
390pF
+IN2
MB3832A
MB3832A
REFERENCE DATA
Output voltage output current characteristics
+25°C
V+IN2 VREF/3 (+IN2c) Output voltage V+IN2 VREF2/3 (+IN2b) V+IN2 VREF (+IN2a)
Output current
Soft start operation waveforms
(2.52
VO(V)
CTL(V)
t(ms)
MB3832A
USAGE PRECAUTIONS
Printed circuit board ground lines should with consideration common impedance. Take appropriate static electricity measures.
Containers semiconductor materials should have anti-static protection made conductive material. After mounting, printed circuit boards should stored shipped conductive bags containers. Work platforms, tools, instruments should properly grounded. Working personnel should grounded with resistance between body ground.
ORDERING INFORMATION
Part number MB3832APFV Package 20-pin Plastic SSOP (FPT-20P-M03) Remarks
MB3832A
PACKAGE DIMENSION
20-pin Plastic SSOP (FPT-20P-M03)
These dimensions include resin protrusion.
6.50±0.10(.256±.004)
1.25 -0.10 .049 -.004
+0.20 +.008
(Mounting height)
0.10(.004)
INDEX
4.40±0.10
6.40±0.20 (.173±.004) (.252±.008)
5.40(.213)
0.65±0.12 (.0256±.0047)
0.22 -0.05 .009
+0.10 +.004 -.002
0.15 -0.02 .006 -.001
+0.05 +.002
Details part 0.10±0.10(.004±.004) (STAND OFF)
5.85(.230)REF
0.50±0.20 (.020±.008)
1994 FUJITSU LIMITED F20012S-2C-4
Dimensions (inches)
MB3832A
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: 81(44) 754-3763 Fax: 81(44) 754-3329
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherent chance failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Japan, prior authorization Japanese government will required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9901 FUJITSU LIMITED Printed Japan
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