LTC3524

FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LTC3524 Adjustable TFT Bias Supply with WLED Driver DESCRIPTION The LTC®3524 is an integrated BIAS and white LED power converter solution for small/medium-sized polysilicon thin film transistor (TFT) liquid crystal (LCD) display panels. The device operates from a single Lithium-Ion/polymer battery or any voltage source between 2.5V and 6V. A 1.5MHz synchronous boost converter generates a programmable low noise, high efficiency 25mA TFT supply of up to 6.0V. Regulated, low ripple charge pumps are used to generate up to +20V and –20V at 2mA. Output sequencing is internally controlled to insure proper initialization and rapid discharge of the LCD panel in shutdown. A second 1.5MHz boost converter powers one or two LED strings with up to five series elements each. LED current and display brightness can be controlled over a wide range using analog or digital means up to 25mA. The LTC3524 is offered in the 4mm × 4mm 24-pin QFN package, minimizing the total solution footprint. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Generates Three Adjustable, Low Noise Rails for Small/Medium TFT Displays Drives Up to Ten White LEDs LED Dimming and Open-Circuit Protection Controlled Power-Up/Power-Down Sequencing 1.5MHz Fixed Frequency, Low Noise Operation VIN Range 2.5V to 6V, VOUT Range 3V to 6V TFT Supply Efficiency Up to 90% LED Supply Efficiency Up to 78% Two Independantly Enabled LED Strings 200 to 1 True Color PWMTM Dimming Tiny External Solution 24-Lead QFN Package (4mm × 4mm × 0.75mm) APPLICATIONS ■ ■ ■ ■ ■ PDAs, Palmtop Computers Digital Still and Video Cameras Handheld GPS Portable Instrument Displays Portable Media Players TYPICAL APPLICATION +5V, –7.5V, +12.5V, 8 LED Power Supply + – +5V 25mA 2.2μF SW1 10μH VIN 3.3μH SW2 VLED LED2 LED1 LTC3524 PROG ELED2 ELED1 ELCD FBN 1M FBH C H+ CH– GND CN+ 0.1μF 0.1μF VN –7.5V 2mA 0.47μF 100k for 20mA 470k VIN VOUT 60 5 10μF 90 EFFICIENCY (%) 100 Li-Ion LCD Bias and LED Efficiency VIN = 3.6V, VOUT = 5V, 8 LEDs VIN = 3.6V LCD 80 LED VOUT 10μF +10V 0.47μF 0.1μF 324k 1M FBVO VNIN V2x C2+ C2– VH 70 +12.5V 2mA 0.47μF 220k 2M 15 20 10 VOUT OR LED STRING CURRENT (mA) 25 3524 TA01b 3524 TA01a 3524f 1 LTC3524 ABSOLUTE MAXIMUM RATINGS (Referred to GND) PIN CONFIGURATION TOP VIEW ELED1 ELED2 PROG VLED LED1 18 LED2 17 CH– 16 CH+ 25 15 VH 14 FBH 13 FBN 7 C2+ 8 V2x 9 10 11 12 VNIN CN+ NC VN VIN, SW1, VOUT, C2–....................................... –0.3 to 7V ELCD, ELED1, ELED2, PROG ......................... –0.3 to 7V FBN, FBH, FBVO ............................................. –0.3 to 7V V2x, C2+, CH– .............................................. –0.3 to 13V LED1, LED2, VLED, SW2 ............................. –0.3 to 22V VNIN, VH, CH+, CN+ ...................................... –0.3 to 21V VN .............................................................. –21 to +0.3V Operating Temperature Range (Note 2) ...–40°C to 85°C Storage Temperature Range...................–65°C to 125°C 24 23 22 21 20 19 ELCD 1 VIN 2 FBVO 3 VOUT 4 SW1 5 C2– 6 UF PACKAGE 24-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 25) MUST BE SOLDERED TO PCB AND CONNECTED TO GND ORDER INFORMATION LEAD FREE FINISH LTC3524EUF#PBF LEAD BASED FINISH LTC3524EUF TAPE AND REEL LTC3524EUF#TRPBF TAPE AND REEL LTC3524EUF#TR PART MARKING 3524 PART MARKING 3524 PACKAGE DESCRIPTION 24-Lead (4mm × 4mm) Plastic QFN PACKAGE DESCRIPTION 24-Lead (4mm × 4mm) Plastic QFN TEMPERATURE RANGE –40°C to 85°C TEMPERATURE RANGE –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS PARAMETER Input Voltage Range VIN Quiescent Supply Current LCD VIN Quiescent Supply Current LED VOUT Quiescent Supply Current LCD VIN Quiescent Current Shutdown Switching Frequency Maximum Duty Cycle VOUT Boost Regulator FBVO Regulation Voltage VOUT Adjust Range See Note 3 CONDITIONS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 3.6V, VOUT = 5.1V, TA = 25°C, unless otherwise noted. MIN ● SW2 TYP 200 4 250 .02 MAX 6.0 UNITS V μA mA μA 2.5 ELCD = 1.5V, ELED1,2 = GND ELCD = GND, ELED1,2 = 1.5V (LED1 and LED2 Open) ELCD = 1.5V, ELED1,2 = GND ELCD = ELED1,2 = GND LED and LCD Boosts LED and LCD Boosts ● 2 2 μA MHz % 1 85 1.20 3.0 1.5 94 1.225 1.25 6.0 V V 3524f 2 LTC3524 ELECTRICAL CHARACTERISTICS PARAMETER Switch Current Limit Charge Pumps V2x Output Voltage Output Impedance V2x V2x Maximum Operating Voltage VH Output Voltage (Quadrupler) Output Impedance (2X + Quadrupler) FBH Regulation Voltage VH Maximum Operating Voltage VN Output Voltage FBN Regulation Voltage Output Impedance VN (2X + VN) VN Minimum Operating Voltage Switching Frequency Charge Pumps V2x to VN Delay VN to VH Delay LED Boost LED1,2 Current Accuracy SW2 Maximum Current Limit SW2 VCESAT Logic Inputs ELED1, ELED2 , ELCD Thresholds Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3524E is guaranteed to meet specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization, and statistical process controls. ● The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 3.6V, VOUT = 5.1V, TA = 25°C, unless otherwise noted. CONDITIONS MIN 100 Load on V2x = 250μA Flying Capacitors = 0.1μF (Note 3) Load = 250μA (FBH = 1V) Flying Capacitors = 0.1μF ● TYP 150 10 250 12 20 1200 MAX UNITS mA V Ω V V Ω 1.15 1.225 20 –9.7 1.30 V V (Note 3) Load on VN = 250μA, VNIN = 10.2V, External Schottkys ● 0.94 1 650 –20 94 2 2 1.06 V Ω V KHz ms ms Flying Capacitor = 0.1μF (Note 3) (Note 4) (Note 4) RPROG = 100k ISW = 350mA 0.4 18 500 20 700 350 0.8 22 mA mA mV 1.2 V Note 3: Specification is guaranteed by design and not 100% tested in production. Note 4: Measured from point at which VN crosses –VOUT to point at which CH+ starts switching. 3524f 3 LTC3524 TYPICAL PERFORMANCE CHARACTERISTICS LCD Boost Efficiency vs Load Current 100 L = 10μH VOUT = 5V 85 TA = 25°C, unless otherwise noted. 4 LEDs per String Efficiency vs VIN and LED Current 85 80 L = 4.7μH LED Efficiency vs VIN L = 4.7μH 90 EFFICIENCY (%) EFFICIENCY (%) 80 EFFICIENCY (%) 75 70 65 60 55 3 4 3.5 VIN (V) 4.5 5 3524 G02 80 75 70 VIN = 5 VIN = 4.2 VIN = 3.6 VIN = 3.1 VIN = 2.5 0 10 40 30 20 50 VOUT CURRENT (mA) 60 70 60 70 PER STRING: 5 LEDs 4 LEDs 3 LEDs 2 LEDs VIN = 5 VIN = 4.2 VIN = 3.6 VIN = 3.1 VIN = 2.5 5 10 15 20 LED CURRENT (mA) 25 3524 G03 50 65 2.5 3524 G01 LED1 String Current vs VIN and Number of LEDs 22.0 21.5 21.0 CURRENT (mA) 20.5 20.0 19.5 19.0 18.5 18.0 2.5 3 3.5 VIN (V) 3524 G04 LED2 String Current vs VIN and Number of LEDs 22.0 21.5 21.0 V2X VOLTAGE (V) CURRENT (mA) 20.5 20.0 19.5 19.0 18.5 5 18.0 2.5 3 3.5 VIN (V) 3524 G05 V2X Output Voltage vs V2X Load Current 10.0 9.5 PER STRING: 5 LEDs 4 LEDs 3 LEDs 2 LEDs 4 4.5 PER STRING: 5 LEDs 4 LEDs 3 LEDs 2 LEDs 4 4.5 5 9.0 8.5 0 1 2 4 3 V2X LOAD CURRENT (mA) 5 3524 G06 VH Voltage vs VH and VN Load Current (FBH = 0V) 20 VN = 0mA 19 VH VOLTAGE (V) VN = 1mA –VN VOLTAGE (V) 9.0 8.5 8.0 VN = 2mA 10.0 9.5 VN Voltage vs VN and VH Load Current (FBN = 1.3V) 8.0 7.5 VH = 1mA VOLTAGE (V) 7.0 6.5 6.0 5.5 5.0 7.5 4.5 VOUT, |VN|, and VH/2 Regulation Overtemperature |VN| VH = 0mA VH/2 18 VH = 2mA 17 VOUT 16 0 0.5 1.5 1 VH LOAD CURRENT (mA) 2 3524 G07 7.0 0 0.5 1 1.5 VN LOAD CURRENT (mA) 2 3524 G09 4.0 –40 –15 10 35 TEMPERATURE (°C) 60 85 3524 G10 3524f 4 LTC3524 TYPICAL PERFORMANCE CHARACTERISTICS LCD Bias Sequencing VH TA = 25°C, unless otherwise noted. SW1 Voltage and 10μH Inductor Current at 25mA Load LCD Bias Sequencing VH VOUT SW1 2V/DIV 5V/DIV V2X VN VOUT 5V/DIV VN ILCD BOOST INDUCTOR CURRENT 200mA/DIV ILCD BOOST INDUCTOR CURRENT 50mA/DIV 200ns/DIV 3524 G13 5ms/DIV 3524 G11 5ms/DIV 3524 G12 SW1 Voltage and 10μH Inductor Current at 5mA Load SW2 200mV/DIV SW1 2V/DIV ILCD BOOST INDUCTOR CURRENT 200mA/DIV SW2 5V/DIV SW2 Voltage and 4.7μH Inductor Current at 20mA LED Initial Start-Up Waveforms ILED BOOST INDUCTOR CURRENT VLED 5V/DIV LED1 LED2 500mV/DIV ILCD BOOST INDUCTOR CURRENT 50mA/DIV 200ns/DIV 3524 G14 200ns/DIV 3524 G15 50μs/DIV 3524 G16 LED Burst Dimming Waveforms LED1 and SW2 ELED1 AND ELED2 ILED BOOST INDUCTOR LED1 SW2 12V 10V/DIV 10V/DIV 5V/DIV 200mA/DIV ELED1 AND ELED2 ILED BOOST INDUCTOR VLED LED2 LED Burst Dimming Waveforms LED2 and VLED 5V/DIV 200mA/DIV 12.5V 12V 10V/DIV 10V/DIV 500μs/DIV 3524 G17 500μs/DIV 3524 G18 3524f 5 LTC3524 PIN FUNCTIONS VIN (Pin 2): Common Input Supply for LCD Bias and White LED Boost Converters. This pin must be locally bypassed with a minimum of 2.2μF. GND/Exposed Pad (Pin 25): Signal and Power Ground for the LTC3524. Provide a short, direct PCB path between GND and the (–) side of the boost (VOUT, VLED) filter capacitors, and the (–) side of the charge pump outputs (V2x, VH, VN) filter capacitors. PCB ground must be soldered to the Exposed Pad for proper operation. LCD BIAS PIN FUNCTIONS ELCD (Pin 1): Enable Input for the LTC3524’s LCD Circuits. LCD bias supplies are actively discharged to GND when ELCD is low through internal pull down devices. An optional RC network on ELCD provides a slower ramp-up of the LCD boost converter inductor current during startup (soft-start). Shutdown mode is activated by driving ELCD, ELED1, and ELED2 low. Shutdown disables all IC functions and reduces quiescent current from the battery to less than 2μA. FBVO (Pin 3): Feedback Pin for the VOUT Switcher. Reference voltage is 1.225V. Connect resistive divider tap here with minimum trace area. R1⎞ ⎛ VOUT = 1 . 225 ⎜ 1 + ⎟ (See Block Diagram) ⎝ R2 ⎠ VOUT (Pin 4): Main Output of the LCD Boost Regulator and Input to the Voltage Doubler (2X) Stage. Bypass VOUT with a low ESR, ESL ceramic capacitor (X5R type) between 4.7 and 22μF. SW1 (Pin 5): Synchronous Boost Switch. Connect a 4.7μH-15μH inductor between SW1 and VIN. Keep PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, the PMOS synchronous rectifier is turned off to prevent reverse charging of the inductor and an internal switch connects SW1 to VIN to reduce EMI. C2– (Pin 6): Charge pump doubler flying capacitor negative node. The charge pump doubler flying capacitor is connected between C2+ and C2–. The voltage on C2– will alternate between GND and VOUT at an approximate 50% duty cycle while the charge pump is operating. Use a 0.1μF X5R type ceramic capacitor for best results. C2+ (Pin 7): Charge pump doubler flying capacitor positive node. The charge pump doubler flying capacitor is connected between C2+ and C2–. The voltage on C2+ will alternate between VOUT and V2x at an approximate 50% duty cycle while the charge pump is operating. Use a 0.1μF X5R type ceramic capacitor for best results. V2x (Pin 8): Charge Pump Doubler Output and Input to the Charge Pump Quadrupler. This output generates 2X VOUT. V2x should be bypassed to GND with a 0.47μF X5R type ceramic capacitor. C2+ and C2– should be left open and V2x connected to VOUT if the doubler is not needed to generate VH or VN. VNIN (Pin 9): Positive Voltage Input for the Charge Pump Inverter. The charge pump inverter can generate a regulated negative voltage up to the voltage applied to VNIN. Connect VNIN to VOUT, V2x, or VH. If VNIN is connected to VH, external diodes and a capacitor are required for sequencing (see the Applications Information section). CN+ (Pin 10): Charge Pump Inverter Flying Capacitor Positive Node. The charge pump inverter flying capacitor is connected between CN+ and external Schottky diodes (see Typical Application figures). The voltage on CN+ will alternate between GND and VNIN at an approximate 50% duty cycle while the inverting charge pump is operating. Use a 0.1μF X5R type ceramic capacitor for best results. NC (PIN 11): No Connect. This pin should be connected to GND. VN (Pin 12): Negative Charge Pump Converter Output. VN can be regulated down to approximately –VNIN volts depending on where VNIN is connected. VN should be bypassed to GND with at 0.47μF or larger X5R type ceramic capacitor. 3524f 6 LTC3524 LCD BIAS PIN FUNCTIONS FBN (Pin 13): Feedback Pin for the VN Charge-Pump Output. Reference voltage is 1.0V. Connect the resistive divider tap between VOUT and VN here with minimum trace area. VN = −R6 ( VOUT − 1) + 1 (See Block Diagram) R5 up to 2mA to a load. VH should be bypassed to GND with a 0.47μF X5R type ceramic capacitor. Connect V2x to VOUT for applications requiring a regulated voltage less than 2X VOUT. CH+ (Pin 16): Charge Pump Quadrupler Flying Capacitor Positive Node. The charge pump quadrupler (4X) flying capacitor is connected between CH+ and CH–. The voltage on CH+ will alternate between V2x and VH at an approximate 50% duty cycle while the charge pump is operating. Use a 0.1μF X5R type ceramic capacitor for best results. CH– (Pin 17): Charge Pump Quadrupler (4X) Flying Capacitor Negative Node. The voltage on CH– will alternate between GND and V2x at an approximate 50% duty cycle while the charge pump is operating. Use a 0.1μF X5R type ceramic capacitor for best results. FBH (Pin 14): Feedback Pin for the VH Charge-Pump Output. Reference voltage is 1.225V. Connect resistive divider tap here with minimum trace area. ⎛ R3 ⎞ V H = 1 . 225 ⎜ 1 + ⎟ (See Block Diagram) ⎝ R4 ⎠ VH (Pin 15): Charge Pump Quadrupler Output. This output can be regulated to 4X VOUT and is capable of delivering WHITE LED DRIVER PIN FUNCTIONS LED2 (Pin 18): Output for Second LED String. Connect up to five white LEDs between LED2 (anode) and GND (cathode). For best current matching and efficiency use the same number of white LEDs in both strings. LED1 (Pin 19): Output for First LED String. VLED (Pin 20): Output of the LED Switcher. Bypass VLED with a low ESR, ESL ceramic capacitor (X5R type) of at least 1μF. Keep PCB trace lengths as short and wide as possible to minimize EMI and voltage overshoot. SW2 (Pin 21): White LED Boost Switch. Connect a 3.315μH inductor between SW2 and VIN. This is the collector of the internal NPN power switch. Connect an external Schottky diode between SW2 and VLED. Keep PCB trace lengths as short and wide as possible to minimize EMI and voltage overshoot. ELED2 (Pin 22): Enable and PWM Dimming Control Input for the LED2 String. The LED2 string is disabled when this pin is grounded. Digital dimming can be implemented by driving the ELED2 pin between 0V and >1.2V at low frequency (ie., 500Hz). Driving ELCD, ELED1, and ELED2 low initiates shutdown mode which disables all IC functions and reduces quiescent current from the battery to less than 2μA. PROG (Pin 23): A single resistor (RPROG) between PROG and GND sets the current in the LED strings. LED current in mA is programmed by: ⎛ 2 × 10 6 ⎞ ILED1 = ILED2 = ⎜ ⎟ mA ⎝ RPROG ⎠ A 100K resistor programs 20mA in each string. Analog dimming can be implemented by connecting a second resistor between PROG and a control voltage. ELED1 (Pin 24): Enable and Pulse Dimming Control Input for the LED1 String. For applications with five or fewer LEDs, better efficiency is achieved by operating a single LED string. For example, ELED1 = 1, ELED2 = 0, LED2 left open circuit and the LED string connected to LED1. 3524f 7 LTC3524 BLOCK DIAGRAM 10μH 2.5V TO 6V 4.7μH 5 SW1 VBEST 2 VIN 21 SW2 VLED 20 STRING ENABLE LED CURRENT SHARING OVP LED1 19 LED2 18 10μF +5V VOUT R1 1M R2 324k 4 SHDN HIGH VOLTAGE PWM BOOST CONVERTER SYNCHRONOUS PWM BOOST CONVERTER 3 FBVO 1.225V 7 6 +10V 8 C2+ C2– V2x OUT SHDN CHARGE PUMP DOUBLER IN VOUT PROG 23 ELED2 22 RPROG ANALOG DIMMING ENABLE/PULSE DIM LED2 STRING ENABLE/PULSE DIM LED1 STRING LCD BIAS ENABLE V2x CHARGE PUMP SEQUENCER OSCILLATOR CONTROL SHUTDOWN WHEN ELED1 ELCD = ELED1 = ELED2 = 0V 24 ELCD 1 VNIN 9 IN REGULATED CHARGE PUMP INVERTER OUT CN+ 10 NC 11 VN 12 16 17 +12.5V 15 CH+ CH – VH IN REGULATED CHARGE PUMP QUADRUPLER OUT SHDN –7.5V 10μF R4 220k R3 2M SHDN R6 1M R5 470k VOUT 14 FBH 1.225V GND, EXPOSED PAD 25 1V FBN 13 3524 BD 3524f 8 LTC3524 OPERATION The LTC3524 is a highly integrated power converter intended for small to medium-sized TFT LCD display modules. The part generates the required bias voltages for the LCD panel as well as regulated current for one or two white LED backlight strings. The LCD bias and white LED boost converters are powered from a common input voltage between 2.5V and 6V and share a 1.5MHz oscillator, allowing tiny inductors and capacitors to be used. The LCD bias supply and each white LED string can be independently enabled and a low current shutdown mode ( V2X CH– GND CN+ 0.1μF VN 0.1μF 3524 TA02a 100 90 EFFICIENCY (%) 4.2 80 3.6 LCD (VIN ) LED (VIN ) 3.1 3.6 70 4.2 3.1 60 5 10 15 20 VOUT OR LED STRING CURRENT (mA) 25 3524 TA02b 3524f 14 LTC3524 PACKAGE DESCRIPTION UF Package 24-Lead Plastic QFN (4mm × 4mm) (Reference LTC DWG # 05-08-1697) 0.70 ± 0.05 4.50 ± 0.05 2.45 ± 0.05 3.10 ± 0.05 (4 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.75 ± 0.05 BOTTOM VIEW—EXPOSED PAD R = 0.115 TYP PIN 1 NOTCH R = 0.20 TYP OR 0.35 × 45° CHAMFER 4.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) 23 24 0.40 ± 0.10 1 2 2.45 ± 0.10 (4-SIDES) (UF24) QFN 0105 0.200 REF 0.00 – 0.05 NOTE: 1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.25 ± 0.05 0.50 BSC 3524f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 15 LTC3524 TYPICAL APPLICATION 3NiMH or NiCD to +3.3V, 25mA, +10V, 1mA, –5V, 1mA TFT LCD Power Supply + 6 White LEDs COILCRAFT MSS4020 SERIES + 3 NiMH OR NiCD 2.2μF SW1 10μH VIN 4.7μH SW2 VLED LED2 LED1 10μF 100 – +3.3V, 25mA 10μF 510k 301k 90 3.1V EFFICIENCY (%) LCD (VIN ) VOUT 80 2.5V 3.1V 70 3.6V 3.6V LCD (VIN ) 60 LED (VIN ) 2.5V FBVO +6.6V 0.47μF 0.1μF +10V, 1mA 0.47μF 165k 2M FBH CH+ CH– GND CN+ V2x C2+ C2 – VH LTC3524 100k FOR 20mA PROG ELED2 ELED1 ELCD VNIN 232k FBN VN 0.1μF 0.47μF 604k – 5V, 1mA PHILIPS PMEG3005 VOUT VIN V2x 50 5 10 15 20 VOUT OR LED STRING CURRENT (mA) 25 3524 TA03b 0.1μF 3524 TA03a RELATED PARTS PART NUMBER LT1942 LT1947 LTC3450 LT3465/LT3465A LT3466/LT3466-1 LT3471 LT3491 LT3494/LT3494A LT3497 LT3591 DESCRIPTION Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver 3MHz, 30V Adjustable Output TFT-LCD Triple Switching Regulator Constant-Current, 1.2MHz/2.7MHz High Efficiency White LED Boost Regulator with Integrated Schottky Diode Dual Constant-Current, 2MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode Dual Output, Boost/Inverter, 1.3A ISW, 1.2MHZ, High Efficiency Boost-Inverting DC/DC Converter Constant-Current, 2.3MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode 40V, 180mA/350mA Micropower Low Noise Boost Converter with Output Disconnect Constant-Current, 2.3MHz, Dual High Efficiency White LED Boost Regulator with Integrated Schottky Diode for 12 LEDs Constant-Current, 1MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode COMMENTS VIN : 2.6V to 16V, VOUT(MAX) = 36V, IQ = 7mA, ISD = < 1μA, 4mm × 4mm QFN-24 Package VIN : 2.7V to 8V, VOUT(MAX) = 30V, IQ = 9.5mA, ISD = < 1μA, MSOP-10 Package VIN : 1.5V to 4.6V, VOUT(MAX) = 15V, IQ = 75μA, ISD = < 1μA, 3mm × 3mm QFN-16 Package VIN : 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD = < 1μA, ThinSOTTM Package VIN : 2.7V to 24V, VOUT(MAX) = 40V, IQ = 5mA, ISD = < 16μA, 3mm × 3mm DFN-10 Package VIN : 2.4V to 16V, VOUT(MAX) = ±40V, IQ = 2.5mA, ISD = < 1μA, 3mm × 3mm DFN-10 Package VIN : 2.5V to 12V, VOUT(MAX) = 27V, IQ = 2.6mA, ISD = < 8μA, 2mm × 2mm DFN-6 SC70 Package VIN : 2.3V to 16V, VOUT(MAX) = 40V, IQ = 65μA, ISD = < 1μA, 3mm × 2mm DFN-8 Package VIN : 2.5V to 10V, VOUT(MAX) = 32V, IQ = 6mA, ISD = < 12μA, 3mm × 2mm DFN-10 Package VIN : 2.5V to 12V, VOUT(MAX) = 40V, IQ = 4mA, ISD = < 9μA, 3mm × 2mm DFN-8 Package ThinSOT is a trademark of Linear Technology Corporation. 3524f 16 Linear Technology Corporation (408) 432-1900 ● FAX: (408) 434-0507 ● LT 0208 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008