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LTC3450 Triple Output Power Supply for Small TFT-LCD Displays
FEATURES
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DESCRIPTIO
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Generates Three Voltages: 5.1V at 10mA - 5V, -10, or -15V at 500A 10V or 15V at 500A Better than 90% Efficiency Low Output Ripple: Less than 5mVP-P Complete 1mm Component Profile Solution Controlled Power-Up Sequence: AVDD/VGL/VGH All Outputs Disconnected and Actively Discharged in Shutdown Low Noise Fixed Frequency Operation Frequency Reduction Input for High Efficiency in Blank Mode Ultralow Quiescent Current: 75A (Typ) in Scan Mode Available in a 3mm x 3mm 16-Pin QFN Package
The LTC(R)3450 is a complete power converter solution for small thin film transistor (TFT) liquid crystal display (LCD) panels. The device operates from a single Lithium-Ion cell, 2- to 3-cell alkaline input or any voltage source between 1.5V and 4.6V. The synchronous boost converter generates a low noise, high efficiency 5.1V, 10mA supply. Internal charge pumps are used to generate 10V, 15V, and -5V, -10V or -15V. Output sequencing is controlled internally to insure proper initialization of the LCD panel. A master shutdown input reduces quiescent current to <2A and quickly discharges each output for rapid turn off of the LCD panel. The LTC3450 is offered in a low profile (0.8mm max), 3mm x 3mm 16-pin QFN package, minimizing the solution profile and footprint.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Cellular Handsets with Color Display Handheld Instruments PDA
TYPICAL APPLICATIO
VIN 1.5V TO 4.6V 47H 2.2F 6 8 SW VIN 7
5.1V, -10V, 15V Triple Output TFT-LCD Supply
2.2F 0.1F AVDD 5.1V/10mA
100 5mA LOAD 95 100H
EFFICIENCY (%)
VOUT 11 C1 + - 10 C1 V2X LTC3450 C2 + C2 - V3X 12 14 13 15 16
BLANK SCAN
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MODE
90 47H 85 80 75 70 1.5
0.47F 0.1F VGH (3 x AVDD) 15V/500A 0.1F
OFF ON
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SHDN
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GND VINV VNEG C3 - C3 + 3 2 1
0.1F 0.1F VGL -10V/500A
3450 TA01
2.0
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AVDD Efficiency vs VIN
2.5 3.0 3.5 VIN (V) 4.0 4.5 5.0
3450 TA01b
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LTC3450
ABSOLUTE
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VINV V3X C2+
(Note 1) (Referred to GND)
VOUT
SHDN
SW
VIN
VIN, SW.......................................................... - 0.3 to 7V SHDN, MODE ................................................. - 0.3 to 7V VOUT .............................................................................. - 0.3 to 7V VNEG ........................................................................ -17V to 0.3V Operating Temperature Range LTC3450E (Note 4) ............................. - 40C to 85C Storage Temperature Range ................. - 65C to 125C
16 15 14 13 C3+ 1 C3- 2 17 12 V2X 11 C1+ 10 C1- 9 5 6 7 8 GND
C2-
ORDER PART NUMBER LTC3450EUD
VNEG 3 MODE 4
UD PART MARKING LAAC
UD PACKAGE 16-LEAD (3mm x 3mm) PLASTIC QFN EXPOSED PAD IS VNEG (PIN 17) MUST BE SOLDERED TO PCB
TJMAX = 125C, JA = 68C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3.6V, VOUT = 5.2V unless otherwise noted.
PARAMETER Input Voltage Range VIN Quiescent Supply Current VOUT Quiescent Supply Current VIN Quiescent Supply Current VOUT Quiescent Supply Current VIN Quiescent Current 5V Boost Regulator VOUT Output Voltage VOUT Efficiency VOUT Maximum Output Current Switch Current Limit Switching Frequency--Boost Switching Frequency--Boost Charge Pumps V2X Output Voltage Load on V2X = 100A
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
q
MIN 1.5
TYP 75 80 30 13 0.01
MAX 4.6 130 50 2 5.151
UNITS V A A A A A V % mA mA kHz kHz
MODE = VIN MODE = VIN MODE = GND MODE = GND SHDN = GND Load on V5X = 5mA Load on V5V = 5mA, (Note 2) L = 47H, (Note 2) 90 MODE = VIN MODE = GND 9.792 5.049
5.100 90 11 120 550 15.62 10.1
10.608
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LTC3450
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3.6V, VOUT = 5.2V unless otherwise noted.
PARAMETER V3X Output Voltage V2X Efficiency V3X Efficiency Output Impedance V2X, V3X VNEG Output Voltage VNEG Efficiency Output Impedance VNEG Switching Frequency Charge Pumps Switching Frequency Charge Pumps VNEG to V3X Delay Logic Inputs SHDN Pin Threshold MODE Pin Threshold Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Specification is guaranteed by design and not 100% tested in production.
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ELECTRICAL CHARACTERISTICS
CONDITIONS Load on V3X = 100A Load on V2X = 100A, (Note 2) Load on V3X = 100A, (Note 2) Flying Capacitors = 0.1F Load on VNEG = 100A, VINV = V2X Load on VNEG = 100A (Note 2) Flying Capacitor = 0.1F MODE = VIN MODE = GND (Note 3)
q
MIN 14.688
TYP 15.2 90 80 1
MAX 15.912
UNITS V % % k
q -10.608
-10.1 80 1 62.5 3.75
- 9.792
V % k kHz kHz
3 0.4
4 0.77 1.6
10 1.2
ms V V
Note 3: Measured from point at which VNEG crosses -5V to point at which C2- starts switching. Note 4: The LTC3450E is guaranteed to meet performance specifications from 0C to 70C. Specifications over the - 40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
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LTC3450 TYPICAL PERFOR A CE CHARACTERISTICS
AVDD Efficiency vs VIN
100 95 EFFICIENCY (%) 90 85 80 75 70 2mA 100 L = 100H 10mA 5mA EFFICIENCY (%) 95 90 5mA 85 2mA 80 75 70 1.5 2.0 2.5 3.0 3.5 VIN (V) 4.0 4.5 5.0 L = 47H 10mA
No Load VIN Current in Blank Mode
100 90 80 VIN CURRENT (A) VIN CURRENT (A) 70 60 50 40 30 20 10 0 1.5 2.0 2.5 3.0 3.5 VIN (V)
3450 G04
500 400 300 200 100 1.5
AVDD (V)
4.0
4.5
VGH vs Load
15.6 15.4 15.2 VGH (V) 15.0 14.8 14.6 14.4 VGL (V) - 9.0 - 9.2 - 9.4 - 9.6 - 9.8
AVDD (V)
0 100 200 300 400 500 600 700 800 900 1000 VGH LOAD (A)
3450 G07
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UW
(TA = 25C unless otherwise noted)
AVDD Efficiency vs VIN
1.5
2.0
2.5
3.0 3.5 VIN (V)
4.0
4.5
5.0
3450 G02
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No Load VIN Current in Scan Mode
800 700 600 5.16 5.14
AVDD vs VIN and Load
0mA 5.12 5.10 5.08 10mA 5.06 5.04 2mA
5mA
5.0 5.5
2.0
2.5
3.0
3.5 VIN (V)
4.0
4.5
5.0 5.5
1.5
2.0
2.5
3.0 3.5 VIN (V)
4.0
4.5
5.0
3450 G05
3450 G06
VGL vs Load
5.200 5.175 5.150 5.125 5.100 5.075 - 10.0 - 10.2 - 10.4 5.050 5.025 0 100 200 300 400 500 600 700 800 900 1000 VGL LOAD (A)
3450 G08
AVDD vs Temperature Figure 1 Circuit, 1mA Load
5.000 - 40 - 25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
3450 G09
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LTC3450 TYPICAL PERFOR A CE CHARACTERISTICS
AVDD Ripple Voltage AVDD Load = 5mA AVDD Transient Response
AVDD 5mV/DIV (AC)
VIN = 3.6V C2 = 2.2F
AVDD, VGL, VGH Turn-On and Turn-Off Sequence
VGH 0 10V/DIV
AVDD 5V/DIV VGL 5V/DIV
0
VIN = 3.6V C2 = 2.2F
UW
1s/DIV
2ms/DIV
AVDD 100mV/DIV (AC)
AVDD LOAD 5mA 5mA/DIV 1mA
3450 G10
VIN = 3.6V C2 = 2.2F
100s/DIV
3450 G11
AVDD Turn-On Showing Inrush Current Limiting
INDUCTOR CURRENT 100mA/DIV 0 AVDD 2V/DIV 0
3450 G12
VIN = 3.6V
20s/DIV
3450 G13
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LTC3450
PI FU CTIO S
C3+ (Pin 1): Charge Pump Inverter Flying Capacitor Positive Node. The charge pump inverter flying capacitor is connected between C3+ and C3 -. The voltage on C3+ will alternate between GND and VINV at an approximate 50% duty cycle while the inverting charge pump is operating. Use a 10nF or larger X5R type ceramic capacitor for best results. C3 - (Pin 2): Charge Pump Inverter Flying Capacitor Negative Node. The charge pump inverter flying capacitor is connected between C3+ and C3 -. The voltage on C3 - will alternate between GND and VNEG at an approximate 50% duty cycle while the inverting charge pump is operating. Use a 10nF or larger X5R type ceramic capacitor for best results. VNEG (Pin 3): Charge Pump Inverter Output. VNEG can be either - 5V or -10V depending on where VINV is connected. VNEG should be bypassed to GND with at 0.1F or larger X5R type ceramic capacitor. VNEG can also be configured for -15V with two external low current Schottky diodes (see Applications section). MODE (Pin 4): Drive MODE high to force the LTC3450 into high power (scan) mode. Drive MODE low to force the LTC3450 into low power (blank) mode. The output voltages remain active with the MODE pin driven low but with reduced output current capability. MODE must be pulled up to VIN or higher on initial application of power in order for proper initialization to occur. SHDN (Pin 5): Master Shutdown Input for the LTC3450. Driving SHDN low disables all IC functions and reduces quiescent current from the battery to less than 2A. Each generated output voltage is actively discharged to GND in shutdown through internal pull down devices. An optional RC network on SHDN provides a slower ramp up of the boost converter inductor current during startup (soft-start). VIN (Pin 6): Input Supply to the LTC3450. Connect VIN to a voltage source between 1.5V and 4.6V. Bypass VIN to GND with a 2.2F X5R ceramic capacitor. VOUT (Pin 7): Main 5.1V Output of the Boost Regulator and Input to the Voltage Doubler Stage. Bypass VOUT with a low ESR, ESL ceramic capacitor (X5R type) between 2.2F and 10F. SW (Pin 8): Switch Pin. Connect the inductor between SW 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 internal P-channel MOSFET synchronous rectifier is turned off to prevent reverse charging of the inductor and an internal switch connects SW to VIN to reduce EMI. GND (Pin 9): Signal and Power Ground for the LTC3450. Provide a short direct PCB path between GND and the (-) side of the output filter capacitor(s) on VOUT, V2X, V3X and VNEG. C1 - (Pin 10): Charge Pump Doubler Flying Capacitor Negative Node. The charge pump doubler flying capacitor is connected between C1 + and C1 -. The voltage on C1- will alternate between GND and VOUT at an approximate 50% duty cycle while the charge pump is operating. Use a 10nF or larger X5R type ceramic capacitor for best results. C1+ (Pin 11): Charge Pump Doubler Flying Capacitor Positive Node. The charge pump doubler flying capacitor is connected between C1+ and C1-. The voltage on C1+ will alternate between VOUT and V2X at an approximate 50% duty cycle while the charge pump is operating. Use a 10nF or larger X5R type ceramic capacitor for best results. V2X (Pin 12): Charge Pump Doubler Output. This output is 10.2V (nom) at no load and is capable of delivering up to 500A to a load. V2X should be bypassed to GND with a 0.47F X5R type ceramic capacitor. C2 - (Pin 13): Charge Pump Tripler Flying Capacitor Negative Node. The charge pump tripler 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 10nF or larger X5R type ceramic capacitor for best results. C2 + (Pin 14): Charge Pump Tripler Flying Capacitor Positive Node. The charge pump tripler flying capacitor is connected between C2 + and C2 -. The voltage on C2 + will alternate between V2X and V3X at an approximate 50% duty cycle while the charge pump is operating. Use a 10nF or larger X5R type ceramic capacitor for best results.
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LTC3450
PI FU CTIO S
V3X (Pin 15): Charge Pump Tripler Output. This output is 15.3V (nom) at no load and is capable of delivering up to 500A to a load. V3X should be bypassed to GND with a 0.1F X5R type ceramic capacitor. VINV (Pin 16): Positive Voltage Input for the Charge Pump Inverter. The charge pump inverter will generate a negative voltage corresponding to the voltage applied to VINV. Connecting VINV to 5V or 10V will generate -5V or -10V respectively on VNEG. See Applications section for -15V generation. Exposed Pad (Pin 17): The exposed pad must be connected to VNEG (Pin 3) on the PCB. Do not connect the exposed pad to GND.
BLOCK DIAGRA
VIN 1.5V TO 4.6V C1 2.2F VIN L1 47H
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OSCILLATOR MODE 550kHz 69kHz 4
BLANK SCAN
OFF ON
SHDN
5
GLOBAL SHUTDOWN
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8
SW
7
VOUT
AVDD 5.1V/10mA C2 2.2F
SYNCHRONOUS PWM BOOST CONVERTER
SHUTDOWN CHARGE PUMP DOUBLER IN OUT SHUTDOWN 11 10 12
C1+ C1- V2X C7 1F C2 + C2 - V3X CF2 0.1F VGH (3 x AVDD) 15V/500A C8 0.47F CF1 0.1F 10V
CHARGE PUMP TRIPLER IN OUT SHUTDOWN
14 13 15
16 CHARGE PUMP INVERTER IN OUT SHUTDOWN 1 2 3
VINV C3 + C3 - VNEG CF3 0.1F VGL -10V/500A C11 0.47F
9 GND
3450 TA01
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LTC3450
OPERATIO
The LTC3450 is a highly integrated power converter intended for small TFT-LCD display modules. A fixed frequency, synchronous PWM boost regulator generates a low noise 5.1V, 10mA bias at greater than 90% efficiency from an input voltage of 1.5V to 4.6V. Three charge pump converters use the 5.1V output to generate 10V, 15V and -5V, -10V or -15V at load currents up to 500A. Each converter is frequency synchronized to the main 500kHz (nominal) boost converter. The generated output voltages are internally sequenced to insure proper initialization of the LCD panel. A digital shutdown input rapidly discharges each generated output voltage to provide a near instantaneous turn-off of the LCD display. Boost Converter The synchronous boost converter utilizes current mode control and includes internally set control loop and slope compensation for optimized performance and simple design. Only three external components are required to complete the design of the 5.1V, 10mA boost converter. The high operation frequency produces very low output ripple and allows the use of small low profile inductors and tiny external ceramic capacitors. The boost converter also disconnects its output from VIN during shutdown to avoid loading the input power source. Softstart produces a controlled ramp of the converter input current during startup, reducing the burden on the input power source. Very low operating quiescent current and synchronous operation allow for greater than 90% conversion efficiency. The MODE input reduces the boost converter operating frequency by approximately 8x when driven high and reduces the output power capability of the boost converter. MODE is asserted when the polysilicon TFT-LCD display is in its extremely low power blank condition. The
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boost converter further reduces its quiescent current in this mode, delivering both lower input (battery) current drain and low noise operation. Charge Pumps The LTC3450 includes three separate charge pump converters which generate 10V, 15V and either -5V, -10V or -15V. Each output can deliver a maximum of 500A. The charge pumps feature fixed frequency, open-loop operation for high efficiency and lowest noise performance. The charge pump converters operate at 1/8 the boost converter frequency and include internal charge transfer switches. Thus, each charge pump requires only two small external capacitors, one to transfer charge, and one for filtering. Similar to the boost converter, the charge pumps operating frequency reduces to approximately 4kHz in blank mode, maintaining low noise operation but at reduced output current capability. Output Sequencing Refer to the following text and Figure 1 for the LTC3450 power-up sequence. When input power is applied, the boost converter initializes and charges its output towards the final value of 5.1V. When the boost converter output reaches approximately 90% of its final value (4.5V), an internal 5V OK signal is asserted which allows the charge pump doubler to begin operation toward its final goal of 10V. Approximately 1ms later, the charge pump inverter begins operation toward its final goal of either -5V or -10V depending on the connection of the VINV input. When the -5V or -10V output (VNEG) reaches approximately 50% of its final value, a 4ms (nominal) timeout period begins. At the conclusion of the 4ms timeout period, the charge pump tripler is allowed to begin operation, which will eventually charge V3X to 15V (nominal).
VX3 VX2 VOUT 15V 10V 5V -10V 1ms VNEG 4ms
3450 F01
Figure 1. Output Sequencing
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LTC3450
APPLICATIO S I FOR ATIO
Inductor Selection Inductors in the range of 47H to 100H with saturation current (ISAT) ratings of at least 150mA are recommended for use with the LTC3450. Ferrite core materials are strongly recommended for their superior high frequency performance characteristics. A bobbin or toroid type core will reduce radiated noise. Inductors meeting these requirements are listed in Table 1.
Table 1. Recommended Inductors
PART NUMBER CLQ4D10-470 CLQ4D10-101 CMD4D08-470 DO1606-473 DO1606-104 DT1608-473 DT1608-104 L MAX DCR HEIGHT (H) () (mm) VENDOR 47 100 47 47 100 47 100 1.28 3.15 1.6 1.1 2.3 0.34 1.1 1.5 2.5 0.64 1.27 1.2 1.0 2.0 2.92 2.6 2.92 Sumida (847) 956-0666 www.sumida.com Coilcraft (847) 639-6400 www.coilcraft.com Murata www.murata.com Coev Magnetics www.circuitprotection.com
LQH43MN470J03 47 LQH43MN101J03 100 DU6629-470M DU6629-101M 47 100
Capacitor Selection The boost converter requires two capacitors. The input capacitor should be an X5R type of at least 1F. The VOUT capacitor should also be an X5R type between 2.2F and 10F. A larger capacitor (10F) should be used if lower output ripple is desired or the output load required is close to the 10mA maximum. The charge pumps require flying capacitors of at least 0.1F to obtain specified performance. Ceramic X5R types are strongly recommended for their low ESR and ESL and capacitance versus bias voltage stability. The filter capacitor on V2X should be at least 0.1F. A 0.47F or larger capacitor on V2X is recommended if VINV is connected to V2X. The filter capacitors on V3X and VNEG should be 0.1F or larger. Please be certain that the capacitors used are rated for the maximum voltage with adequate safety margin. Refer to Table 2 for a listing of capacitor vendors.
Table 2. Capacitor Vendor Information
Supplier AVX Murata Taiyo Yuden Phone (803) 448-9411 (714) 852-2001 (408) 573-4150 Website www.avxcorp.com www.murata.com www.t-yuden.com
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Soft-Start Soft-start operation provides a gradual increase in the current drawn from the input power source (usually a battery) during initial startup of the LTC3450, eliminating the inrush current which is typical in most boost converters. This reduces stress on the input power source, boost inductor and output capacitor, reduces voltage sag on the battery and increases battery life. The rate at which the input current will increase is set by two external components (RSS and CSS) connected to SHDN (refer to Figure 2). Upon initial application of power or release of a pull down switch on SHDN, the voltage on SHDN will increase relative to the R * C time constant or RSS * CSS. After one time constant SHDN will rise to approximately 63.2% of the voltage on VIN. From 0V to approximately 0.65V on SHDN, no switching will occur because the shutdown threshold is 0.65V (typ). From 0.65V to 1V the maximum switch pin current capability of the LTC3450 will gradually increase from near zero to the maximum current limit. An RSS in the range of 1M to 10M is recommended. If SHDN is driven high with a logic signal, the input current will gradually increase to its maximum value in approximately 50s.
VIN RSS 1M 5% 5 SHDN CSS 6.8nF 1ms SOFT-START WITH 3.6V VIN
3450 F02
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Figure 2. Soft-Start Component Configuration
Printed Circuit Board Layout Guidelines High speed operation of the LTC3450 demands careful attention to PCB layout. You will not get advertised performance with careless layout. Figure 3 shows the recommended component placement for a single layer PCB. A multilayer board with a separate ground plane is ideal but not absolutely necessary.
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LTC3450
APPLICATIO S I FOR ATIO U
V3X JUMPER VIN NOTE: QFN PACKAGE EXPOSED PAD IS CONNECTED TO THE VNEG PIN. DO NOT CONNECT EXPOSED PAD TO GROUND GND
3450 F03
MODE SHDN
TYPICAL APPLICATIO
VIN 1.5V TO 4.6V
C1 2.2F
BLANK SCAN
OFF ON
D1, D2: DUAL SCHOTTKY DIODE, PANASONIC MA704WKCT L1: SUMIDA CMD4D08-470
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VNEG
VOUT
Figure 3. Suggested Layout
5.1V, -15V, 15V Triple Output TFT-LCD Supply
L1 47H 8 6 SW VIN 7 VOUT 11 C1 + 10 C1 - V2X LTC3450 5 SHDN C2 + C2 - V3X 9 GND VINV VNEG C3 - C3 + 3 2 1 0.1F CF3 0.1F C5 0.1F VGL -15V/500A 12 14 13 15 16 D2 C6 0.1F CF2 0.1F D1 VGH 15V/500A C4 0.47F CF1 0.1F C2 2.2F AVDD 5.1V/10mA
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MODE
3450 TA02
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LTC3450
PACKAGE DESCRIPTIO
3.35 0.05 1.45 0.05 2.20 0.05 (4 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.75 0.05
0.00 - 0.05 NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. 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 4. EXPOSED PAD SHALL BE SOLDER PLATED
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.
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UD Package 16-Lead Plastic QFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1691)
0.57 0.05 PACKAGE OUTLINE 0.23 0.05 0.50 BCS BOTTOM VIEW--EXPOSED PAD R = 0.115 TYP 15 16 0.40 0.10 3.00 0.10 (4 SIDES) PIN 1 TOP MARK 1 1.45 0.10 (4-SIDES) 2
(UD) QFN 0802
0.200 REF
0.23 0.05 0.50 BSC
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LTC3450
TYPICAL APPLICATIO
VIN 1.5V TO 4.6V
C1 2.2F
BLANK SCAN
OFF ON
L1: SUMIDA CMD4D08-470
RELATED PARTS
PART NUMBER LT1310 LT1613 LT1615/LT1615-1 LT1940 LT1944 LT1944-1 LT1945 LT1946/LT1946A LT1947 LT1949/LT1949-1 LTC3400/LTC3400B LTC3401 LTC3402 DESCRIPTION 1.5A ISW, 4.5MHz, High Efficiency Step-Up DC/DC Converter 550mA ISW, 1.4MHz, High Efficiency Step-Up DC/DC Converter 300mA/80mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter Dual Output 1.4A IOUT, Constant 1.1MHz, High Efficiency Step-Down DC/DC Converter Dual Output 350mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter Dual Output 150mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter Dual Output, Pos/Neg, 350mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter 1.5A ISW, 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converter Triple Output ( for TFT-LCD) 1.1A ISW, 3MHz High Efficiency Step-Up DC/DC Converter 550mA ISW, 600kHz/1.1MHz, High Efficiency Step-Up DC/DC Converter 600mA ISW, 1.2MHz, Synchronous Step-Up DC/DC Converter 1A ISW, 3MHz, Synchronous Step-Up DC/DC Converter 2A ISW, 3MHz, Synchronous Step-Up DC/DC Converter COMMENTS VIN: 2.75V to 18V, VOUT = 35V, IQ = 12mA, ISD = <1A MSE Package VIN: 0.9V to 10V, VOUT = 34V, IQ = 3mA, ISD = <1A ThinSOT Package VIN: 1.2V to 15V, VOUT = 34V, IQ = 20A, ISD = <1A ThinSOT Package VIN: 3V to 25V, VOUT (MIN) = 1.2V, IQ = 2.5mA, ISD = <1A TSSOP-16E Package VIN: 1.2V to 15V, VOUT = 34V, IQ = 20A, ISD = <1A MS Package VIN: 1.2V to 15V, VOUT = 34V, IQ = 20A, ISD = <1A MS Package VIN: 1.2V to 15V, VOUT = 34V, IQ = 20A, ISD = <1A MS Package VIN: 2.45V to 16V, VOUT = 34V, IQ = 3.2mA, ISD = <1A MS8 Package VIN: 2.7V to 8V, VOUT = 34V, IQ = 9.5mA, ISD = <1A MS Package VIN: 1.5V to 12V, VOUT = 28V, IQ = 4.5mA, ISD = <25A S8, MS8 Packages VIN: 0.85V to 5V, VOUT = 5V, IQ = 19A/300A, ISD = <1A ThinSOT Package VIN: 0.5V to 5V, VOUT = 5V, IQ = 38A, ISD = <1A, MS Package VIN: 0.5V to 5V, VOUT = 5V, IQ = 38A, ISD = <1A, MS Package
3450f LT/TP 1203 1K * PRINTED IN USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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5.1V, - 5V, 15V Triple Output TFT-LCD Supply
L1 47H 8 6 SW VIN 7 VOUT 11 C1 + 10 C1 - V2X LTC3450 5 SHDN C2 + C2 - V3X 9 GND VINV VNEG C3 - C3 + 3 2 1 C5 0.1F VGL -5V/500A 12 14 13 15 16 C6 0.1F CF2 0.1F C4 0.47F CF1 0.1F C2 2.2F AVDD 5.1V/10mA 4 MODE VGH (3 x AVDD) 15V/500A CF3 0.1F
3450 TA03
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003
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