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LTC3426 Datasheet

  • LTC3426

  • 1.2MHz Step-Up DC/DC Converter in SOT-23

  • 12頁

  • LINER

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LTC3426
1.2MHz Step-Up DC/DC
Converter in SOT-23
FEATURES
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DESCRIPTIO
Internal 2A MOSFET Switch
1.2MHz Switching Frequency
Integrated Soft-Start
V
IN
Range: 1.6V to 4.3V
Low R
DS(ON)
Switch: 100m鈩?at 5V Output
Delivers 5V at 800mA from a 3.3V Input
Delivers 3.3V at 800mA from a 2.5V Input
Uses Small, Low Profile External Components
Low Profile (1mm) SOT-23 (ThinSOT
TM
) Package
The LTC
廬
3426 step-up switching regulator generates an
output voltage of up to 5.5V from an input voltage as low
as 1.6V. Ideal for applications where space is limited, it
switches at 1.2MHz, allowing the use of tiny, low cost and
low profile external components. Its internal 2A, 100m鈩?/div>
NMOS switch provides high efficiency even at heavy load,
while the constant frequency, current mode architecture
results in low, predictable output noise that is easy to filter.
Antiringing circuitry reduces EMI concerns by damping
the inductor while in discontinuous mode, and internal
soft-start eases inrush current worries. Internal frequency
compensation is designed to accommodate ceramic out-
put capacitors, further reducing noise. The device features
very low shutdown current of 0.5碌A.
The LTC3426 is available in the 6-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6498466, 6611131
APPLICATIO S
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White LED Driver Supply
Local 3.3V or 5V Supply
Battery Back-Up
TYPICAL APPLICATIO
V
IN
3.3V
2.2碌H
3.3V to 5V Boost Converter
100
95
90
SW
V
IN
10碌F
OFF ON
V
OUT
V
OUT
5V
800mA
22碌F
V
IN
= 3.3V
V
OUT
= 5V
EFFICIENCY (%)
85
80
75
70
65
60
LTC3426
SHDN
GND
FB
3426 TA01
55
50
1
10
100
LOAD CURRENT (mA)
1000
3426 TA01b
U
Efficiency
3426f
U
U
1

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