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LTC3400-1 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT
FEATURES

DESCRIPTIO
Up to 92% Efficiency Generates 3.3V at 100mA from a Single AA Cell Low Start-Up Voltage: 0.85V VOUT Connected to VIN in Shutdown Internal Synchronous Rectifier 2.5V to 5V Output Range Automatic Burst Mode(R) Operation Logic Controlled Shutdown (< 1A) Antiringing Control Minimizes EMI Tiny External Components Low Profile (1mm) SOT-23 Package
The LTC(R)3400-1 is a synchronous, fixed frequency, stepup DC/DC converter delivering high efficiency in a 6-lead ThinSOTTM package. Capable of supplying 3.3V at 100mA from a single AA cell input, the device contains an internal NMOS switch and PMOS synchronous rectifier. A switching frequency of 1.2MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3400-1 features automatic shifting to power saving Burst Mode operation at light loads. In shutdown, VOUT and VIN are connected, which allows the input battery to be used for backup power. The LTC3400-1 features low shutdown current of under 1A. The LTC3400-1 is offered in the low profile (1mm) SOT-23 package.
, LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. US Patent Numbers 5,481,178; 6,580,258; 6,304,066; 6,127,815; 6,498,466; 6,611,131.
APPLICATIO S

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TYPICAL APPLICATIO
100
Single Cell to 3.3V Synchronous Boost Converter
90
4.7H SINGLE AA CELL 4.7F VIN
EFFICIENCY (%)
+
80 70 60 50
SW VOUT 1.02M 1% 604k 1%
LTC3400-1 OFF ON SHDN GND FB
VOUT 3.3V 100mA 4.7F
FIGURE 1 CIRCUIT WITH OPTIONAL SCHOTTKY DIODE (SEE APPLICATIONS INFORMATION) 1 10 100 LOAD CURRENT (mA) 1000
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34001 F01
40 0.1
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Efficiency
VIN = 2.4V VIN = 1.5V
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1
LTC3400-1
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW SW 1 GND 2 FB 3 6 VIN 5 VOUT 4 SHDN
VIN Voltage ................................................. - 0.3V to 6V SW Voltage DC .......................................................... - 0.3V to 6V Pulsed (<100ns) ......................................- 0.3V to 7V SHDN, FB Voltage ....................................... - 0.3V to 6V VOUT ........................................................... - 0.3V to 6V Operating Temperature Range (Note 2) .. - 30C to 85C Storage Temperature Range ................... - 65C to 125 Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC3400ES6-1 S6 PART MARKING LTBJM
S6 PACKAGE 6-LEAD PLASTIC TSOT-23
TJMAX = 125C, JC = 102C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Start-Up Voltage Minimum Operating Voltage Output Voltage Adjust Range Feedback Voltage Feedback Input Current Quiescent Current (Burst Mode Operation) Quiescent Current (Shutdown) Quiescent Current (Active) NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance NMOS Current Limit Burst Mode Operation Current Threshold Current Limit Delay to Output Max Duty Cycle Switching Frequency (Note 3) (Note 3)
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 1.2V, VOUT = 3.3V, unless otherwise specified.
CONDITIONS ILOAD = 1mA SHDN = VIN (Note 4) 2.5
MIN
TYP 0.85 0.5
MAX 1 0.65 5 1.268 30 1 500 5
UNITS V V V V nA A A A A A mA mA ns %
1.192
1.23 1 19 0.01 300 0.1 0.1 0.35 0.20 0.45 0.30
VFB = 1.25V (Note 3) VFB = 1.4V (Note 5) VSHDN = 0V, Not Including Switch Leakage, VIN = VOUT Measured On VOUT VSW = 5V VSW = 0V (Note 3) VOUT = 3.3V VOUT = 5V VOUT = 3.3V VOUT = 5V 600
850 3 40
VFB = 1.15V

80 0.95 0.85 1
87 1.2 1.2 1.5 1.5 0.35
SHDN Input High SHDN Input Low SHDN Input Current VSHDN = 5.5V
0.01
1
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3400-1 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the - 30C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in production. Note 4: Minimum VIN operation after start-up is only limited by the battery's ability to provide the necessary power as it enters a deeply discharged state. Note 5: Burst Mode operation IQ is measured at VOUT. Multiply this value by VOUT/VIN to get the equivalent input (battery) current.
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MHz MHz V V A
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LTC3400-1 TYPICAL PERFOR A CE CHARACTERISTICS
Output Load Burst Mode Threshold vs VIN
L = 4.7H TA = 25C OUTPUT CURRENT (mA) 20 VOUT = 3.3V VOUT = 5V
3.32 VOUT (V) 3.30 3.28 3.26 3.36 3.34
START-UP VOLTAGE (V)
10
0 0.9 1.5 2.1 2.7 VIN (V) 3.3 3.9 4.5
3400 G01
No Load Battery Current vs VBATT
1000 VOUT = 3.3V TA = 25C
NORMALIZED FREQUENCY
BATTERY CURRENT (A)
100
10 0.9
1.2
1.5 1.8 2.1 2.4 BATTERY VOLTAGE (V)
SW Pin Fixed Frequency, Continuous Inductor Current Operation
VSW 1V/DIV
0V VIN = 1.3V VOUT = 3.3V IOUT = 50mA L = 6.8H COUT = 4.7F 100ns/DIV
3400 G07
UW
2.7
3400 G04
VOUT vs Temperature
FIGURE 1 CIRCUIT IO = 10mA 1.4 1.3 1.2 1.1 1.0 0.9 0.8 -30 0 30 60 TEMPERATURE (C) 90 120
3400 G02
Minimum Start-Up Voltage vs Load Current
TA = 25C
3.24 -60
0.1
1 10 IOUT (mA) CURRENT SOURCE LOAD
100
3400 G03
Normalized Oscillator Frequency vs Temperature
1.01 1.00 0.99 0.98 0.97 0.96 0.95 -50 -30
SW Pin Antiringing Operation
VSW 1V/DIV
0V VIN = 1.3V VOUT = 3.3V IOUT = 10mA L = 6.8H COUT = 4.7F 100ns/DIV
3400 G06
3.0
30 50 -10 10 TEMPERATURE (C)
70
90
3400 G05
Fixed Frequency and Burst Mode Operation
VOUT Transient Response
VOUT(AC) 100mV/DIV 60mA 10A VIN = 1.3V 10ms/DIV VOUT = 3.3V IOUT = 60mA TO 10A L = 6.8H COUT = 4.7F
3400 G08
VOUT(AC) 100mV/DIV 100mA IOUT 40mA VIN = 1.3V 100s/DIV VOUT = 3.3V IOUT = 40mA TO 100mA L = 6.8H COUT = 4.7F
3400 G09
IOUT
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LTC3400-1
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor between SW and VIN. Optional Schottky diode is connected between SW and VOUT. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, or SHDN is low, an internal 100 antiringing switch is connected from SW to VIN to minimize EMI. GND (Pin 2): Signal and Power Ground. Provide a short direct PCB path between GND and the (-) side of the output capacitor(s). FB (Pin 3): Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.23V * [1 + (R1/R2)] SHDN (Pin 4): Logic Controlled Shutdown Input. SHDN = High: Normal free running operation, 1.2MHz typical operating frequency. SHDN = Low: Shutdown, quiescent current < 1A. 100 connected between SW and VIN. VIN is connected to VOUT through the internal P-channel MOSFET synchronous rectifier and external inductor. Typically, SHDN should be connected to VIN through a 1M pull-up resistor. VOUT (Pin 5): Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier MOSFET. Bias is derived from VOUT. PCB trace length from VOUT to the output filter capacitor(s) should be as short and wide as possible. VOUT is connected to VIN in shutdown through the internal P-channel MOSFET synchronous rectifier. VIN (Pin 6): Battery Input Voltage. The device gets its start-up bias from VIN. Once VOUT exceeds VIN, bias comes from VOUT. Thus, once started, operation is completely independent from VIN. Operation is only limited by the output power level and the battery's internal series resistance.
BLOCK DIAGRA
+
SINGLE CELL INPUT 6 VIN
VOUT GOOD START-UP OSC A B A/B MUX
PWM CONTROL RAMP GEN 1.2MHz PWM COMPARATOR
SHUTDOWN
SYNC DRIVE CONTROL
SLOPE COMP
SLEEP
Burst Mode OPERATION CONTROL
CC 150pF
CP2 2.5pF
SHDN 4 SHUTDOWN CONTROL SHUTDOWN
2 GND
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4
+
RC 80k
gm ERROR AMP
-
-
+
- - +
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L1 4.7H CIN 1F 1 SW
OPTIONAL SCHOTTKY
2.3V 0.45 VOUT 5 3.3V OUTPUT
0.35 CFF (OPTIONAL) R1 1.02M 1% (EXTERNAL)
CURRENT SENSE
FB 3 1.23V REF COUT 4.7F
R2 604k 1% (EXTERNAL)
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LTC3400-1
OPERATIO
The LTC3400-1 is a1.2MHz, synchronous boost converter housed in a 6-lead ThinSOT package. Able to operate from an input voltage below 1V, the device features fixed frequency, current mode PWM control for exceptional line and load regulation. With its low RDS(ON) and gate charge internal MOSFET switches, the device maintains high efficiency over a wide range of load current. Detailed descriptions of the three distinct operating modes follow. Operation can be best understood by referring to the Block Diagram. Low Voltage Start-Up The LTC3400-1 will start up at a typical VIN voltage of 0.85V or higher. The low voltage start-up circuitry controls the internal NMOS switch up to a maximum peak inductor current of 850mA (typ), with an approximate 1.5s offtime during start-up, allowing the device to start up into an output load. Once VOUT exceeds 2.3V, the start-up circuitry is disabled and normal fixed frequency PWM operation is initiated. In this mode, the LTC3400-1 operates independent of VIN, allowing extended operating time as the battery can droop to several tenths of a volt without affecting output voltage regulation. The limiting factor for the application becomes the ability of the battery to supply sufficient energy to the output. Low Noise Fixed Frequency Operation Oscillator: The frequency of operation is internally set to 1.2MHz. Error Amp: The error amplifier is an internally compensated transconductance type (current output) with a transconductance (gm) = 33 microsiemens. The internal 1.23V reference voltage is compared to the voltage at the FB pin to generate an error signal at the output of the error amplifier. A voltage divider from VOUT to ground programs the output voltage via FB from 2.5V to 5V using the equation: VOUT = 1.23V * [1 + (R1/R2)] Current Sensing: A signal representing NMOS switch current is summed with the slope compensator. The summed signal is compared to the error amplifier output
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to provide a peak current control command for the PWM. Peak switch current is limited to approximately 850mA independent of input or output voltage. The current signal is blanked for 40ns to enhance noise rejection. Zero Current Comparator: The zero current comparator monitors the inductor current to the output and shuts off the synchronous rectifier once this current reduces to approximately 20mA. This prevents the inductor current from reversing in polarity improving efficiency at light loads. Antiringing Control: The antiringing control circuitry prevents high frequency ringing of the SW pin as the inductor current goes to zero by damping the resonant circuit formed by L and CSW (capacitance on SW pin). Burst Mode Operation Portable devices frequently spend extended time in low power or standby mode, only switching to high power drain when specific functions are enabled. In order to improve battery life in these types of products, high power converter efficiency needs to be maintained over a wide output power range. In addition to its high efficiency at moderate and heavy loads, the LTC3400-1 includes automatic Burst Mode operation that improves efficiency of the power converter at light loads. Burst mode operation is initiated if the output load current falls below an internally programmed threshold (see Typical Performance graph, Output Load Burst Mode Threshold vs V IN). Once initiated, the Burst Mode operation circuitry shuts down most of the device, only keeping alive the circuitry required to monitor the output voltage. This is referred to as the sleep state. In sleep, the LTC3400-1 draws only 19A from the output capacitor, greatly enhancing efficiency. When the output voltage has drooped approximately 1% from nominal, the LTC3400-1 wakes up and commences normal PWM operation. The output capacitor recharges and causes the LTC3400-1 to reenter sleep if the output load remains less than the sleep threshold. The frequency of this intermittent PWM or burst operation is proportional to load current; that is, as the load current drops further below the burst threshold, the LTC3400-1 turns on less frequently. When the load current increases
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LTC3400-1
OPERATIO
above the burst threshold, the LTC3400-1 will resume continuous PWM operation seamlessly. Referring to the Block Diagram, an optional capacitor (CFF) between VOUT and FB in some circumstances can reduce the peak-to-
APPLICATIO S I FOR ATIO
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3400-1 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 1 shows the recommended component placement. A large ground pin copper area will help to lower the chip temperature. A multilayer board with a separate ground plane is ideal, but not absolutely necessary.
(OPTIONAL)
OUTPUT CURRENT (mA)
VIN
1 2 3
SW
VIN 6
GND VOUT 5 FB SHDN 4 SHDN
VOUT
34001 F02
RECOMMENDED COMPONENT PLACEMENT. TRACES CARRYING HIGH CURRENT ARE DIRECT. TRACE AREA AT FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Figure 1. Recommended Component Placement for Single Layer Board
COMPONENT SELECTION Inductor Selection The LTC3400-1 can utilize small surface mount and chip inductors due to its fast 1.2MHz switching frequency. A minimum inductance value of 3.3H is necessary for 3.6V and lower voltage applications and 4.7H for output voltages greater than 3.6V. Larger values of inductance
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peak VOUT ripple and input quiescent current during Burst Mode operation. Typical values for CFF range from 15pF to 220pF. will allow greater output current capability by reducing the inductor ripple current. Increasing the inductance above 10H will increase size while providing little improvement in output current capability. The approximate output current capability of the LTC3400-1 versus inductance value is given in the equation below and illustrated graphically in Figure 2.
180 160 140 120 VOUT = 5V 110 80 60 3 5 7 9 11 13 15 17 19 21 23 INDUCTANCE (H)
34001 F03
VIN =1.2V
VOUT = 3V VOUT = 3.3V VOUT = 3.6V
Figure 2. Maximum Output Current vs Inductance Based On 90% Efficiency
V *D IOUT(MAX) = * IP - IN * (1 - D) f * L * 2 where: = estimated efficiency IP = peak current limit value (0.6A) VIN = input (battery) voltage D = steady-state duty ratio = (VOUT - VIN)/VOUT f = switching frequency (1.2MHz typical) L = inductance value
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LTC3400-1
APPLICATIO S I FOR ATIO
The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (IP). High frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types, improving efficiency. The inductor should have low ESR (series resistance of the windings) to reduce the I2R power losses, and must be able to handle the peak inductor current without saturating. Molded chokes and some chip inductors usually do not have enough core to support the peak inductor currents of 850mA seen on the LTC3400-1. To minimize radiated noise, use a toroid, pot core or shielded bobbin inductor. See Table 1 for some suggested components and suppliers.
Table 1. Recommended Inductors
L (H) 4.1 10 4.7 4.7 10 4.7 3.3 4.7 10 4.7 4.7 10 4.7 MAX DCR m 57 124 105 170 109 182 216 174 60 75 90 84 137 195 HEIGHT (mm) 2.0 2.0 1.8 1.8 3.5 3.5 0.8 0.8 2.9 2.9 2.9 2.0 2.0 2.2
PART CDRH5D18-4R1 CDRH5D18-100 CDRH3D16-4R7 CDRH3D16-6R8 CR43-4R7 CR43-100 CMD4D06-4R7MC CMD4D06-3R3MC DS1608-472 DS1608-103 DO1608C-472 D52LC-4R7M D52LC-100M LQH3C4R7M24
VENDOR Sumida (847) 956-0666 www.sumida.com
Coilcraft (847) 639-6400 www.coilcraft.com Toko (408) 432-8282 www.tokoam.com Murata www.murata.com
Output and Input Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple. Multilayer ceramic capacitors are an excellent choice as they have
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extremely low ESR and are available in small footprints. A 2.2F to 10F output capacitor is sufficient for most applications. Larger values up to 22F may be used to obtain extremely low output voltage ripple and improve transient response. An additional phase lead capacitor may be required with output capacitors larger than 10F to maintain acceptable phase margin. X5R and X7R dielectric materials are preferred for their ability to maintain capacitance over wide voltage and temperature ranges. Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. It follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as possible to the device. A 4.7F input capacitor is sufficient for virtually any application. Larger values may be used without limitations. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers directly for detailed information on their entire selection of ceramic parts.
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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Output Diode Use a Schottky diode such as an MBR0520L, PMEG2010EA, 1N5817 or equivalent if the converter output voltage is 4.5V or greater. The Schottky diode carries the output current for the time it takes for the synchronous rectifier to turn on. Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency. A Schottky diode is also strongly recommended for output voltages below 4.5V, and will increase converter efficiency by 2% to 3%.
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LTC3400-1
TYPICAL APPLICATIO S
Single Cell to 3.3V Synchronous Boost Converter with Load Disconnect in Shutdown
L1 4.7H D1 1 6 SW VIN VOUT 5 M1 Si2305DS R3 510k 3 C2 4.7F R1 1.02M 1% R2 604k 1% Q1 2N3904
34001 TA01a
+
SINGLE AA CELL
OFF ON
D1: PHILLIPS PMEG2010EA L1: SUMIDA CDRH2D18/HP-4R7
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C1 4.7F
LTC3400-1 4 SHDN GND 2 FB
VOUT 3.3V 100mA
R3 510k
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LTC3400-1
TYPICAL APPLICATIO S
Single Lithium Cell to 5V, 250mA
2 1nF L1 4.7H D1 1 6 SW VIN VOUT 5 C2 4.7F R1 1.02M 1% R2 332k 1%
34001 TA02a
+
LITHIUM CELL
D1: PHILIPS PMEG2010EA L1: SUMIDA CDRH2D18/HP-4R7 C1, C2: TAIYO YUDEN JMK212BJ475MG
EFFICIENCY (%)
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OPTIONAL SNUBBER
C1 4.7F
LTC3400-1 OFF ON 4 SHDN GND 2 FB 3
C3 100pF
3.6V to 5V Efficiency
100 LTC3400-1 CO = 4.7F L = 4.7H
90
80
70
60
50 0.1
1
10 100 LOAD CURRENT (mA)
1000
34001 TA02b
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LTC3400-1
TYPICAL APPLICATIO S
Single Cell AA Cell to 3V Synchronous Boost Converter
L1 4.7H C3 1F 1 6 SW VIN VOUT 5 R1 1.02M 1% R2 715k 1% D1 D2 VOUT1 3V C2 90mA 4.7F
+
SINGLE AA CELL
D1, D2: ZETEX FMND7000 DUAL DIODE L1: SUMIDA CDRH2D18/HP-4R7
10
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C1 4.7F
LTC3400-1 OFF ON 4 SHDN GND 2 FB 3
C4 10F
34001 TA03a
VOUT2 -3V 10mA
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LTC3400-1
PACKAGE DESCRIPTIO U
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 - 0.45 6 PLCS (NOTE 3) 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 0.09 - 0.20 (NOTE 3) 1.90 BSC
S6 TSOT-23 0302
0.62 MAX
0.95 REF
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
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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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LTC3400-1
TYPICAL APPLICATIO U
Single AA Cell to 2.5V Synchronous Boost Converter
L1 3.3H D1 1 6 SW VIN VOUT 5 R1 1.02M 1% R2 1M 1% VOUT 2.5V 130mA C2 4.7F SINGLE AA CELL C1 4.7F LTC3400-1 OFF ON 4 SHDN GND D1: PHILIPS PMEG2010EA L1: SUMIDA CDRH2D18/HP-3R7 2 FB 3
34001 TA04a
+
RELATED PARTS
PART NUMBER LT1308A/LT1308B LT1613 LT1615 LT (R)1618 LT1619 LTC1872 LT1930/LT1930A LT1932 LT1946/LT1946A LT1949 LTC3400/LTC3400B LTC3401 LTC3402 LTC3421 LTC3423 LTC3424 LTC3425 LTC3429 DESCRIPTION High Current, Micropower, Single Cell 600kHz DC/DC Converter 1.4MHz, Single Cell DC/DC Converter in ThinSOT Micropower Step-Up DC/DC Converter in ThinSOT 1.4MHz Step-Up DC/DC Converter with Current Limit High Efficiency Boost DC/DC Controller ThinSOT Boost DC/DC Controller 1.2MHz/2.2MHz DC/DC Converters in ThinSOT Constant Current Step-Up LED Driver 1.2MHz/2.7MHz Boost DC/DC Converters 600kHz, 1A Switch PWM DC/DC Converter 600mA, 1.2MHz Synchronous Boost Converters in ThinSOT 1A, 3MHz Micropower Synchronous Boost Converter 2A, 3MHz Micropower Synchronous Boost Converter 3A, 3MHz Micropower Synchronous Boost Converter 1A, 3MHz Micropower Synchronous Boost Converter 2A, 3MHz Micropower Synchronous Boost Converter 5A, 8MHz, 4-Phase Micropower Synchronous Boost Converter 600mA, 500kHz Synchronous Boost Converter in ThinSOT COMMENTS 5V at 1A with Single Li-Ion Cell, VOUT to 34V VIN as Low as 1.1V, 3V at 30mA from Single Cell IQ = 20A, 1A Shutdown Current, VIN as Low as 1V 1.5A Switch, 1.6V to 18V Input Range, Input or Output Current Limiting 1A Gate Drive, 1.1V to 20V Input, Separate VCC for Gate Drive 50kHz, 2.5V to 9.8V Input VIN = 2.6V to 16V, 5V at 450mA from 3.3V Input Drives Up to Eight White LEDs, ThinSOT Package 1.5A, 36V Internal Switch, 8-Pin MSOP Package 1A, 0.5, 30V Internal Switch, VIN as Low as 1.5V, Low-Battery Detect Active in Shutdown Up to 92% EFFiciency, 600mA Switch, No Burst Option (LTC3400B) 1A Switch, Programmable Frequency, 10-Pin MSOP Package 2A Switch, Programmable Frequency, 10-Pin MSOP Package Up to 96% Efficiency, 3A Switch, True Output Disconnect, 4mm x 4mm QFN Package 1A Switch, Separate Bias Pin for Low Output Voltages 2A Switch, Separate Bias Pin for Low Output Voltages Up to 95% Efficiency, 5A Switch, True Output Disconnect, IQ = 12A, QFN Package Up to 96% Efficiency, 600mA Switch, True Output Disconnect, Soft Start
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LT/TP 0604 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2004

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