noise boost converters with integrated power switch, feedback resistor
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LT3495/LT3495B/ LT3495-1/LT3495B-1 650mA/350mA Micropower Noise Boost Converter with Output Disconnect DESCRIPTION
noise boost converters with integrated power switch, feedback resistor output disconnect circuitry. parts control power delivery varying both peak inductor current switch off-time. This novel* control scheme results output voltage ripple well high efficiency over wide load range. LT3495/LT3495-1, off-time switch allowed exceed fixed level, guaranteeing switching frequency stays above audio band entire load range. parts feature high performance power switch with 650mA 350mA current limit LT3495/LT3495B LT3495-1/LT3495B-1 respectively. quiescent current 60A, which further reduced 0.1A shutdown. internal disconnect circuitry allows output voltage isolated from input during shutdown. auxiliary reference input (CTRL pin) overrides internal 1.235V feedback reference with lower value allowing full control output voltage during operation. LT3495 series available tiny 10-lead package.
Quiescent Current Active Mode 0.1A Shutdown Mode Noise Control Scheme (Switching Frequency Always Stays Above Audible Range LT3495/-1) Integrated Power NPN: 650mA Current Limit (LT3495/B) 350mA Current Limit (LT3495-1/B-1) Integrated Output Disconnect Integrated Output Dimming Wide input range: 2.3V Wide output range Integrated feedback resistor Tiny 10-Lead Package
APPLICATIONS
OLED Power Noise Power Player
Lare registered trademarks Linear Technology Corporation. other trademarks property their respective owners. *Patent pending.
TYPICAL APPLICATION
OLED Power Supply from Li-Ion Cell
VOUT PEAK-TO-PEAK RIPPLE (mV) Li-Ion CELL 4.7F SHDN CTRL VOUT 909k
3495 TA01a
Output Voltage Ripple Load Current
1.0F 0603 CAPACITOR VOUT EFFICIENCY
Efficiency Load Current
3.6V LOAD FROM LOAD FROM VOUT POWER LOSS (mW)
2.2F VOUT 70mA
LT3495
2.2F 1206 CAPACITOR VOUT LOAD CURRENT (mA)
3495 TA01b
LOAD CURRENT (mA)
3495 TA01c
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LT3495/LT3495B/ LT3495-1/LT3495B-1 ABSOLUTE MAXIMUM RATINGS
(Note
CONFIGURATION
VIEW CTRL SHDN VOUT
Voltage .16V Voltage .40V Voltage .40V VOUT Voltage .40V SHDN Voltage .10V CTRL Voltage .10V Voltage .2.5V Maximum Junction Temperature. 125°C Operating Temperature Range (Note -40°C 125°C Storage Temperature Range. -65°C 150°C
PACKAGE 10-LEAD (3mm 2mm) PLASTIC TJMAX 125°C, 76°C/W EXPOSED (PIN GND, MUST SOLDERED
ORDER INFORMATION
LEAD FREE FINISH LT3495EDDB#PBF LT3495EDDB-1#PBF LT3495BEDDB#PBF LT3495BEDDB-1#PBF TAPE REEL LT3495EDDB#TRPBF LT3495EDDB-1#TRPBF LT3495BEDDB#TRPBF LT3495BEDDB-1#TRPBF PART MARKING LDSS LDSV LDST LDSW PACKAGE DESCRIPTION 10-Lead (3mm 2mm) Plastic 10-Lead (3mm 2mm) Plastic 10-Lead (3mm 2mm) Plastic 10-Lead (3mm 2mm) Plastic TEMPERATURE RANGE -40°C 125°C -40°C 125°C -40°C 125°C -40°C 125°C
Consult Marketing parts specified with wider operating temperature ranges. Consult Marketing information non-standard lead based finish parts. more information lead free part marking, http://www.linear.com/leadfree/ more information tape reel specifications,
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Voltage Voltage Line Regulation Resistor Quiescent Current Quiescent Current Shutdown Minimum Switch-Off Time Maximum Switch-Off Time Maximum Switch-On Time Switch Current Limit
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN VCC, unless otherwise noted. (Note
CONDITIONS VCTRL (Note Voltage 1.235V Switching VSHDN After Start-Up (Note During Start-Up (Note LT3495/LT3495-1, 1.5V LT3495/LT3495B
1.255
UNITS
1.220 74.7
1.235 0.03
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LT3495/LT3495B/ LT3495-1/LT3495B-1 ELECTRICAL CHARACTERISTICS
PARAMETER Switch Current Limit Switch VCESAT Switch Leakage Current PMOS Disconnect Current Limit PMOS Disconnect VCAP VOUT VCAP VOUT Clamp Voltage SHDN Input Voltage High SHDN Input Voltage SHDN Bias Current CTRL Bias Current CTRL Offset Maximum Shunt Current VSHDN VSHDN VCTRL 0.5V, Current Flows VCTRL 0.5V LT3495/LT3495-1, 1.5V
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN VCC, unless otherwise noted. (Note
CONDITIONS LT3495-1/LT3495B-1 LT3495/LT3495B, 400mA LT3495-1/LT3495B-1, 200mA After Start-Up During Start-Up IOUT 50mA, VCAP
0.01
UNITS
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note guaranteed meet performance specifications from 125°C junction temperature. Specifications over -40°C 125°C operating junction temperature range assured design, characterization correlation with statistical process controls.
Note Internal reference voltage determined finding voltage level which causes quiescent current increase 150A above "Not Switching" level. Note CTRL overriding internal reference, Start-Up mode occurs when less then half voltage CTRL. CTRL overriding internal reference, Start-Up mode occurs when less then half voltage internal reference.
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency Load Current
1000 3.6V VOUT FIGURE CIRCUIT VOUT VOLTAGE CHANGE
25°C unless otherwise noted.
Load RegulatioVCC 3.6V VOUT FIGURE CIRCUIT -0.5 -1.0 -1.5 VOUT VOLTAGE LOAD CURRENT (mA)
3495
VOUT CTRL Voltage
FIGURE CIRCUIT
SWITCHING FREQUENCY (kHz)
LOAD CURRENT (mA)
3495
CTRL VOLTAGE
3495
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LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Temperature
1.00 MINIMUM SWITCHING FREQUENCY (kHz) OUTPUT VOLTAGE CHANGE 3.6V 0.75 VOUT LOAD 0.50 FIGURE CIRCUIT 0.25 0.00 -0.25 -0.50 -0.75 -1.00 TEMPERATURE (°C)
3495
25°C unless otherwise noted.
Minimum Switching Frequency
FIGURE CIRCUIT QUIESCENT CURRENT TEMPERATURE (°C)
3495
Quiescent Current Switching
3495
Quiescent Current Temperature
SWITCH VCESAT (mV)
Saturation Voltage Switch Current (LT3495)
Saturation Voltage Switch Current (LT3495-1)
QUIESCENT CURRENT
SWITCH VCESAT (mV) SWITCH CURRENT (mA)
TEMPERATURE (°C)
3495
SWITCH CURRENT (mA)
3495
3495
SHDN Current SHDN Voltage
1000 INDUCTOR PEAK CURRENT (mA)
Peak Inductor Current Temperature (LT3495)
3.6V VOUT FIGURE CIRCUIT INDUCTOR PEAK CURRENT (mA)
Peak Inductor Current Temperature (LT3495-1)
FIGURE CIRCUIT
SHDN CURRENT
SHDN VOLTAGE
3495
TEMPERATURE (°C)
3495
TEMPERATURE (°C)
3495
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LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL PERFORMANCE CHARACTERISTICS
LT3495 Switching Waveform Load
VOUT VOLTAGE 10mV/DIV COUPLED VOUT VOLTAGE 50mV/DIV COUPLED
25°C unless otherwise noted. LT3495 Switching Waveform 10mA
VOLTAGE 10V/DIV
VOLTAGE 10V/DIV
INDUCTOR CURRENT 100mA/DIV 10s/DIV
3495
INDUCTOR CURRENT 500mA/DIV 2s/DIV
3495
3.6V VOUT
3.6V VOUT
LT3495 Switching Waveform 80mA
VOUT VOLTAGE 50mV/DIV COUPLED VOUT VOLTAGE 20mV/DIV COUPLED
LT3495B-1 Switching Waveform Load
VOLTAGE 10V/DIV
VOLTAGE 10V/DIV
INDUCTOR CURRENT 500mA/DIV 500ns/DIV
3495
INDUCTOR CURRENT 100mA/DIV 20s/DIV
3495
3.6V VOUT
VOUT
LT3495B-1 Switching Waveform 10mA
VOUT VOLTAGE 50mV/DIV COUPLED VOUT VOLTAGE 50mV/DIV COUPLED
LT3495B-1 Switching Waveform 60mA
VOLTAGE 10V/DIV
VOLTAGE 10V/DIV
INDUCTOR CURRENT 200mA/DIV 2s/DIV
3495
INDUCTOR CURRENT 200mA/DIV 500ns/DIV
3495
VOUT
VOUT
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LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL PERFORMANCE CHARACTERISTICS
Line Regulatio0.30 OUTPUT VOLTAGE CHANGE 0.25 PMOS CURRENT (mA) 0.20 0.15 0.10 0.05 -100 SHUTDOWN START-UP AFTER START-UP
25°C unless otherwise noted. Output Disconnect PMOS Current VOUT Voltage Difference
VOLTAGE
3495
VOUT VOLTAGE DIFFERENCE
3495
LT3495 Start-Up Waveforms
SHDN VOLTAGE 5V/DIV
INDUCTOR CURRENT 500mA/DIV
VOLTAGE 5V/DIV VOUT VOLTAGE 5V/DIV 3.6V VOUT FIGURE CIRCUIT 50s/DIV
3495
LT3495 Transient Response
20mA 60mA 20mA LOAD PULSE VOUT VOLTAGE 200mV/DIV COUPLED
LT3495-1 Transient Response
10mA 30mA 10mA LOAD PULSE
VOUT VOLTAGE 200mV/DIV COUPLED
INDUCTOR CURRENT 500mA/DIV
INDUCTOR CURRENT 200mA/DIV
LOAD CURRENT 20mA/DIV 20s/DIV
3495
LOAD CURRENT 20mA/DIV 20s/DIV
3495
3.6V VOUT FIGURE CIRCUIT
3.6V VOUT FIGURE CIRCUIT
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LT3495/LT3495B/ LT3495-1/LT3495B-1 FUNCTIONS
(Pins Ground. directly local ground plane. (Pin Input Supply Pin. Must locally bypassed. CTRL (Pin Dimming Pin. used, CTRL 1.5V higher. use, drive CTRL below 1.235V override internal reference. Applications section more information. SHDN (Pin Shutdown Pin. 1.5V more enable chip. Ground shut down. (Pin Feedback Pin. Minimize metal trace area this minimize noise. Reference voltage 1.235V. There internal resistor from GND. achieve desired output voltage, choose according following formula: (VOUT/1.235 VOUT (Pin Drain Output Disconnect PMOS. Place bypass capacitor from this GND. Applications information. (Pins Source Output Disconnect PMOS. Place bypass capacitor from this GND. (Pin 10): Switch Pin. This collector internal power switch. Minimize metal trace area connected this minimize EMI. Exposed (Pin 11): Ground. This must soldered PCB.
BLOCK DIAGRAM
INPUT VOUT
START-UP CONTROL
SHDN
VREF
CTRL
SWITCH CONTROL
DISCONNECT CONTROL
SHUNT CONTROL
3495
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LT3495/LT3495B/ LT3495-1/LT3495B-1 OPERATION
LT3495 series utilizes variable peak current, variable off-time control scheme provide high efficiency over wide range output current. operation part better understood referring Block Diagram. part senses output voltage monitoring voltage pin. user sets desired output voltage choosing value external feedback resistor. parts incorporate precision bottom feedback resistor. Assuming that output voltage adjustment used (CTRL tied 1.5V greater), internal reference (VREF 1.235V) sets voltage which will servo during regulation. Switch Control block senses output amplifier adjusts switching frequency well other parameters achieve regulation. During start-up circuit, special precautions taken ensure that inductor current remains under control. LT3495/LT3495-1, switching frequency never allowed fall below approximately 45kHz. Because this, minimum load must present prevent output voltage from drifting high. most applications, this minimum load automatically generated within part Shunt Control block. level this current adaptable, removing itself when needed improve efficiency higher load levels. However when input voltage output voltage close, internal shunt current large enough. Under this condition, minimum output load required prevent output voltage from drifting high. LT3495B/B-1, minimum switching frequency feature disabled switching frequency zero. result, output voltage will never drift high minimum output load required. LT3495 series also PMOS output disconnect switch. PMOS switch turned when part enabled SHDN pin. When parts shutdown, PMOS switch turns off, allowing VOUT node ground. This type disconnect function often required power supplies. LT3495 series also sets maximum switch time 10s. This feature guarantees that parts continue deliver energy output even input supply impedance becomes large that commanded peak switch current never reached. difference between LT3495/LT3495B LT3495-1/ LT3495B-1 level current limit. LT3495/LT3495B have typical peak current limit 650mA while LT3495-1/LT3495B-1 have typical peak current limit 350mA. differences between LT3495 LT3495B/ LT3495-1/LT3495B-1 listed Table
Table Difference Between LT3495 LT3495B/LT3495-1/LT3495B-1
PART LT3495 LT3495B LT3495-1 LT3495B-1 SWITCH CURRENT LIMIT (mA) MINIMUM SWITCHING FREQUENCY (kHz) MINIMUM OUTPUT LOAD REQUIREMENT Required under certain conditions Required Required under certain conditions Required
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LT3495/LT3495B/ LT3495-1/LT3495B-1 APPLICATIONS INFORMATION
Inductor Selection Several inductors that work well with LT3495/LT3495B listed Table those LT3495-1/LT3495B-1 listed Table These tables complete, there many other manufacturers devices that used. Consult each manufacturer more detailed information their entire selection related parts, many different sizes shapes available. Inductors with value 3.3H higher recommended most LT3495 series designs. Inductors with core losses small (copper wire resistance) good choices LT3495 series applications. full output power, inductor should have saturation current rating higher than peak inductor current. peak inductor current calculated =ILIMIT
input capacitor output capacitor sufficient most applications. Always capacitor with sufficient voltage rating. Many capacitors rated particularly 0603 case sizes, have greatly reduced capacitance when bias voltages applied. sure check actual capacitance desired output voltage. Generally 0805 1206 size capacitor will adequate. 2.2F capacitor placed node recommended filter inductor current while capacitor placed VOUT node will give excellent transient response stability. Table shows list several capacitor manufacturers. Consult manufacturers more detailed information their entire selection related parts.
Table Recommended Inductors LT3495-1/LT3495B-1
PART SIZE (mm) VENDOR
amps
where ILIMIT 0.65A 0.35A LT3495/LT3495B LT3495-1/LT3495B-1 respectively. inductance value Henrys input voltage boost circuit.
Table Recommended Inductors LT3495/LT3495B
PART LPS4018-103ML MSS5131-103MLC LPS3015-472MLC LPS3015-682MLC LQH43CN4R7M03 CR32-6R8 744031004 SIZE (mm) VENDOR
LPO4815-472MLC LPO4815-682MLC LPO4815-103MLC LPS3008-472MLC LPS3008-682MLC LPS3008-103MLC LQH32CN4R7M53 LQH32CN100K33 CDH28D09/S-6R2 744030004
Coilcraft www.coilcraft.com Murata www.murata.com Sumida www.sumida.com Wurth Elektronik www.weonline.com
Coilcraft www.coilcraft.com Murata www.murata.com Sumida www.sumida.com Wurth Elektronik www.weonline.com
Table Recommended Ceramic Capacitor Manufacturers
MANUFACTURER Taiyo Yuden Murata Kemet PHONE (408) 573-4150 (843) 448-9411 (814) 237-1431 (408) 986-0424 (847) 803-6100 WEBSITE www.t-yuden.com www.avxcorp.com www.murata.com www.kemet.com www.tdk.com
Capacitor Selection small size ceramic capacitors makes them suitable most LT3495 series applications. types recommended because they retain their capacitance over wider voltage temperature ranges than other types such Z5U. 4.7F
Diode Selection Schottky diodes, with their forward voltage drops fast switching speeds, recommended with LT3495 series. Diodes Inc. B0540WS-7 very good choice. This diode rated handle average forward current 0.5A with reverse breakdown.
3495b1b1f
LT3495/LT3495B/ LT3495-1/LT3495B-1 APPLICATIONS INFORMATION
Setting Output Voltage Auxiliary Reference Input LT3495 series equipped with both internal 1.235V reference auxiliary reference input. This allows user select between using built-in reference supplying external reference voltage. voltage CTRL adjusted while chip operating alter output voltage purposes such display dimming contrast adjustment. internal 1.235V reference, CTRL must held higher than 1.5V. When CTRL held between 1.235V, parts will regulate output such that voltage nearly equal CTRL voltage. CTRL voltages close 1.235V, soft transition occurs between CTRL internal reference. Figure shows this behavior. maximum output voltage, select values according following equation: VOUT 1.235 Choosing Feedback Node single feedback resistor connected VOUT (see Figure Regulating VOUT eliminates output offset resulting from voltage drop across output disconnect PMOS. Regulating does compensate voltage drop across output disconnect, resulting output voltage VOUT that slightly lower than voltage resistor divider. Under most conditions, advised that feedback resistor tied VOUT pin. Connecting Load Node efficiency converter improved connecting load instead VOUT pin. power loss PMOS disconnect circuit then made negligible. connecting feedback resistor VOUT pin, quiescent current will consumed feedback resistor string during shutdown since PMOS transistor will open (see Figure disadvantage this method that node cannot ground during shutdown, will limited around diode drop below VCC. Loads connected part should only sink current. Never force external power supplies onto VOUT pins.
SHDN CTRL VOLTAGE VOUT VOUT SHDN CTRL VOUT
3495
When CTRL used override internal reference, output voltage lowered from maximum value down nearly input voltage level. voltage source driving CTRL located distance LT3495, small 0.1F capacitor needed bypass locally.
LT3495
LT3495
Figure Feedback Connection Using VOUT
SHDN CTRL
3495
VOUT
3495
ILOAD
LT3495 CTRL VOLTAGE
Figure CTRL Transfer Curve
Figure Improved Efficiency Connectio3495b1b1f
LT3495/LT3495B/ LT3495-1/LT3495B-1 APPLICATIONS INFORMATION
Maximum Output Load Current maximum output current particular LT3495 series circuit function several circuit variables. following method helpful predicting maximum load current given circuit: Step Calculate peak inductor current: =ILIMIT amps Inrush Current When stepped from ground operating voltage while output capacitor discharged, higher level inrush current flow through inductor Schottky diode into output capacitor. Conditions that increase inrush current include larger more abrupt voltage step VIN, larger output capacitor tied inductor with saturation current. While chip designed handle such events, inrush current should allowed exceed 1.5A. circuits that output capacitor values within recommended range have input voltages less than inrush current remains low, posing hazard device. cases where there large steps (more than and/or large capacitor used pin, inrush current should measured ensure safe operation. Soft-Start connecting SHDN CTRL pins shown Figure using filter CTRL limit start-up current, LT3495 able achieve soft-start. small bias current CTRL allows using small capacitor large time constant. softstart waveform shown Figure soft-start time
VOUT
3495
where ILIMIT 0.65A 0.35A LT3495/LT3495B LT3495-1/LT3495B-1 respectively. inductance value Henrys input voltage boost circuit. Step Calculate inductor ripple current: IRIPPLE
VOUT amps
where VOUT desired output voltage. inductor ripple current greater than peak current, then circuit will only operate discontinuous conduction mode. inductor value should increased that IRIPPLE IPK. application circuit designed operate only discontinuous mode, output current capability will reduced. Step Calculate average input current: IIN(AVG) =IPK IRIPPLE amps
CHIP ENABLE RCTRL CCTRL SHDN CTRL
LT3495
Step Calculate nominal output current: IOUT(NOM) IIN(AVG) VOUT amps
SHDN VOLTAGE 5V/DIV INDUCTOR CURRENT 500mA/DIV CTRL VOLTAGE 2V/DIV VOUT VOLTAGE 5V/DIV
Figure Soft-Start Circuitry
Step Derate output current: IOUT IOUT(NOM) amps output voltages output current capability will increased. When using output disconnect (load current taken from VOUT), these higher currents will cause drop PMOS switch higher resulting reduced output current capability than those predicted preceding equations.
3.6V VOUT
500s/DIV
3495
Figure Soft-Start Waveform
3495b1b1f
LT3495/LT3495B/ LT3495-1/LT3495B-1 APPLICATIONS INFORMATION
value RCTRL CCTRL. following expression used design soft-start time: TSTART
RCTRL CCTRL
VSHDN VSHDN 1.235
Also aware thermal dissipation PMOS times. addition, input voltage more than PMOS will turn during shutdown, resulting output voltage longer being blocked from input. Under this condition, output voltage will about lower than input voltage. Board Layout Considerations with switching regulators, careful attention must paid board layout component placement. maximize efficiency, switch rise fall times made short possible. prevent electromagnetic interference (EMI) problems, proper layout high frequency switching path essential. voltage signal sharp rising falling edges. Minimize length area traces connected always ground plane under switching regulator minimize interplane coupling. addition, feeds into internal error amplifier sensitive noise. Minimizing length area traces this recommended. Connect feedback resistor directly from VOUT keep trace short possible. Recommended component placement shown Figure
where VSHDN voltage SHDN when part enabled. ensure soft-start will work, initial voltage CTRL when part enabled should close soft-start work this initial condition satisfied. Output Disconnect LT3495 series output disconnect PMOS that blocks load from input during shutdown. During normal operation, maximum current through PMOS limited circuitry inside chip. When VOUT voltage difference more than 8.7V (typ), current through PMOS longer limited, much higher. result, forcing 8.7V higher voltage from VOUT pins damage PMOS. cases when voltage high and/or large capacitor used pin, shorting VOUT cause large PMOS currents flow. Under this condition, PMOS peak current should kept less than
CTRL SHDN
VOUT
3495
CTRL SHDN VIAS GROUND PLANE REQUIRED IMPROVE THERMAL PERFORMANCE VIAS GROUND RETURN THROUGH SECOND METAL LAYER, CAPACITOR GROUNDS MUST RETURNED DIRECTLY GROUND
Figure Recommended Board Layout
3495b1b1f
LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL APPLICATIONS
Li-Ion CELL 4.7F 2.2F OUTPUT 70mA 909k
3495 F07a
Efficiency Load Current
VOUT 3.6V LOAD FROM LOAD FROM VOUT POWER LOSS (mW)
EFFICIENCY
LT3495
TURN ON/OFF VOUT DIMMING
SHDN CTRL
4.7F 6.3V, X5R, 0603 2.2F 25V, X5R, 0805 25V, X5R, 0603 DIODES INC. B0540WS-7 COILCRAFT LPS4018-103MLB
LOAD CURRENT (mA)
3495 F07b
Figure Li-Ion Cell Input Boost Converter with LT3495
6.8H Li-Ion CELL 4.7F
Efficiency Load Current
2.2F OUTPUT 70mA 909k
3495 F08a
3.6V
LOAD FROM LOAD FROM VOUT POWER LOSS (mW)
EFFICIENCY
VOUT
LT3495B
TURN ON/OFF VOUT DIMMING
SHDN CTRL
4.7F 6.3V, X5R, 0603 2.2F 25V, X5R, 0805 25V, X5R, 0603 DIODES INC. B0540WS-7 SUMIDA CR32-6R8
LOAD CURRENT (mA)
3495 F08b
Figure Li-Ion Cell Input Boost Converter with LT3495B
LT3495/LT3495B Maximum Output Current Output Voltage
VOUT VALUE REQUIRED 2.37 2.05 1.78 1.47 1.15 0.845 0.536 0.232 MAXIMUM OUTPUT CURRENT INPUT (mA)
3495b1b1f
LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL APPLICATIONS
LI-ION CELL 2.2F
Efficiency Load Current
OUTPUT 30mA 909k EFFICIENCY VOUT 3.6V LOAD FROM POWER LOSS (mW)
LT3495B-1/ LT3495-1 TURN ON/OFF VOUT DIMMING SHDN CTRL
LOAD FROM VOUT
3495 F09a
2.2F 6.3V, X5R, 0603 25V, X5R, 0603 25V, X5R, 0603 DIODES INC. B0540WS-7 MURATA LQH32CN100K33
LOAD CURRENT (mA)
3495 F09b
Figure Li-Ion Cell Input Boost Converter with LT3495-1/LT3495B-1 LT3495-1/LT3495B-1 Maximum Output Current Output Voltage
VOUT VALUE REQUIRED 2.37 2.05 1.78 1.47 1.15 0.845 0.536 0.232 MAXIMUM OUTPUT CURRENT INPUT (mA)
12V, 130mA Boost Converter
4.7F 2.2F VOUT 130mA 665k EFFICIENCY VOUT
3495 TA02a
Efficiency Load Current
LOAD FROM LOAD FROM VOUT POWER LOSS (mW) 1000
3495 TA02b
LT3495B
TURN ON/OFF VOUT DIMMING
SHDN CTRL
4.7F 6.3V, X5R, 0603 2.2F 25V, X5R, 0805 25V, X5R, 1206 DIODES INC. B0540WS-7 COILCRAFT LPS4018-103MLB
LOAD CURRENT (mA)
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LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL APPLICATIONS
Wide Input Range SEPIC Converter with Output
2.2F VOUT EFFICIENCY
Efficiency Load Current
3.3V 1200 1000 POWER LOSS (mW) 1000
3495 TA03b
INPUT 2.6V
LT3495B 232k
3495 TA03a
VOUT 200mA, 3.3V, 300mA, 500mA,
TURN ON/OFF VOUT DIMMING
SHDN CTRL
2.2F 16V, X5R, 0805 16V, X5R, 0805 16V, X5R, 1206 FAIRCHILD SEMI MBR0540 COILCRAFT LPS4018-103MLB
LOAD CURRENT (mA)
PACKAGE DESCRIPTION
Package 10-Lead Plastic (3mm 2mm)
(Reference 05-08-1722
0.64 ±0.05 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 0.05 0.50 2.39 ±0.05 SIDES) RECOMMENDED SOLDER PITCH DIMENSIONS NOTE: DRAWING CONFORMS VERSION (WECD-1) JEDEC PACKAGE OUTLINE M0-229 DRAWING SCALE DIMENSIONS MILLIMETERS DIMENSIONS EXPOSED BOTTOM PACKAGE INCLUDE MOLD FLASH. MOLD FLASH, PRESENT, SHALL EXCEED 0.15mm SIDE EXPOSED SHALL SOLDER PLATED SHADED AREA ONLY REFERENCE LOCATION BOTTOM PACKAGE MARK (SEE NOTE 2.00 ±0.10 SIDES) 0.64 0.05 SIDES) 0.25 0.05 2.39 ±0.05 SIDES) BOTTOM VIEW-EXPOSED 0.20 0.25 CHAMFER
(DDB10) 0905
3.00 ±0.10 SIDES)
0.05
0.115
0.40 0.10
0.200
0.75 ±0.05
0.50
0.05
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Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LT3495/LT3495B/ LT3495-1/LT3495B-1 TYPICAL APPLICATION
Adjustable High Voltage Power Supply Doesn't Need Transformer
DANGER HIGH VOLTAGE! OPERATION HIGH VOLTAGE TRAINED PERSONNEL ONLY 4.7F
Output CTRL
VOUT VOLTAGE
3.3V INPUT
VOUT
3495 TA04a
LT3495B TURN ON/OFF VOUT DIMMING SHDN CTRL
909k 10.7k
VOUT 120V 10mA (VIN 3.3V) 18mA (VIN 35mA (VIN
4.7F 16V, X5R, 0805 C2-C7: 50V, X5R, 0805 D1-D5: DIODE INC. B0540WS-7 COILCRAFT LPS4018-223MLB
CTRL VOLTAGE
3495 TA04b
Efficiency Load Current
EFFICIENCY VOUT 120V POWER LOSS (mW)
3495 TA04c
Output Voltage Ripple Load Current
VOUT PEAK-TO-PEAK RIPPLE (mV) VOUT 120V
LOAD CURRENT (mA)
LOAD CURRENT (mA)
3495 TA04d
RELATED PARTS
PART NUMBER LT1930/LT1930A LT1945 (Dual) LT1946/LT1946A LT3463/LT3463A DESCRIPTION (ISW), 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converters Dual Output, Boost/Inverter, 350mA (ISW), Constant OffTime, High Efficiency Step-Up DC/DC Converter 1.5A (ISW), 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converters COMMENTS VIN: 2.6V 16V, VOUT(MAX) 34V, 4.2mA/5.5mA, <1A, ThinSOT Package VIN: 1.2V 15V, VOUT(MAX) ±34V, 40A, <1A, 10-Lead Package VIN: 2.45V 16V, VOUT(MAX) 34V, 3.2mA, <1A, 8-Lead Package
Dual Output, Boost/Inverter, 250mA (ISW), Constant VIN: 2.3V 15V, VOUT(MAX) ±40V, 40A, <1A, Off-Time, High Efficiency Step-Up DC/DC Converters with Package Integrated Schottkys 1.1A (ISW), 1.3MHz/2.1MHz, High Efficiency Step-Up DC/DC Converters with Soft-Start Dual Output, Boost/Inverter, 1.3A (ISW), High Efficiency Boost-Inverting DC/DC Converter (ISW), 1.2MHz, High Efficiency Step-Up DC/DC Converters with Integrated Schottky Diode Output Disconnect 180mA/350mA (ISW), High Efficiency Step-Up DC/DC Converters with Output Disconnect 40V, 2.5MHz Boost DC/DC Converter VIN: 2.4V 16V, VOUT(MAX) 40V, 1.2mA, <1A, ThinSOT Package VIN: 2.4V 16V, VOUT(MAX) ±40V, 2.5mA, <1A, Package VIN: 2.2V 16V, VOUT(MAX) 36V, 100A, <1A, Package VIN: 2.1V 16V, VOUT(MAX) 40V, 65A, <1A, Package VIN: 2.5V 32V, VOUT(MAX) 40V, 1mA, <1A, MS8E DFN-8 Package
3495b1b1f 0708 PRINTED
LT3467/LT3467A LT3471 LT3473/LT3473A
LT3494/LT3494A LT3580
Linear Technology Corporatio(408) 432-1900 FAX: (408) 434-0507
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2008
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