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LTC3459ES6 Datasheet

  • LTC3459ES6

  • 10V Micropower Synchronous Boost Converter in ThinSOT

  • 12頁

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LTC3459
10V Micropower
Synchronous Boost Converter
in ThinSOT
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
Small Solution Size
>85% Efficiency over Wide Load Range
Internal Synchronous Rectifier
V
IN
Range: 1.5V to 5.5V
5V at 30mA from 3.3V Input
3.3V at 20mA from 2 AA Cell Input
Programmable Output Voltages Up to 10V
Burst Mode
廬
Operation
Inrush Current Limiting
Output Disconnect in Shutdown
Ultralow Quiescent (10碌A(chǔ)) and Shutdown
(< 1碌A(chǔ)) Currents
Low Profile (1mm) SOT-23 Package
The LTC
廬
3459 is a low current, high efficiency synchronous
boost converter intended for low power, size constrained
portable applications. The LTC3459 can be powered from
a single lithium ion battery, a 2- to 3-cell stack of Alkaline
or Nickel batteries, or any low impedance voltage source
between 1.5V and 5.5V. The output is programmable via
an external divider between 2.5V and 10V. Although the part
is primarily intended for boost applications, V
OUT
will
maintain regulation below V
IN
(at reduced efficiency).
The LTC3459 offers Burst Mode operation with a fixed
peak current, providing high conversion efficiency over a
wide range of load currents. During start-up, inductor
current is controlled preventing the inrush surge current
found in many boost converters. In shutdown the output
is disconnected from the input and quiescent current is
reduced to <1碌A(chǔ).
The LTC3459 is offered in a low profile (1mm) 6-pin
SOT-23 (ThinSOT
TM
) package allowing a tiny footprint for
the total solution.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
General Purpose Micropower Boost
Digital Cameras
PDAs
LCD Bias
Small OLED Displays
Supercap Charging
TYPICAL APPLICATIO
5V to 8V Converter
100
22碌H
90
SW
5V
V
IN
V
OUT
2M
FB
365k
3459 TA01a
V
IN
= 5V
V
OUT
= 8V
EFFICIENCY (%)
LTC3459
1碌F
OFF ON
SHDN
GND
47pF
4.7碌F
V
OUT
8V
30mA
80
70
60
50
0.01
U
Efficiency
0.1
1
I
LOAD
(mA)
10
100
3459 TA01b
U
U
3459f
1

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