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LTC3459EDC#PBF

更新时间： 2024-01-10 08:51:19
品牌 Logo 应用领域
凌特 - Linear 转换器升压转换器
页数 文件大小 规格书
12页 218K
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LTC3459  
10V Micropower  
Synchronous Boost Converter  
in ThinSOT  
U
FEATURES  
DESCRIPTIO  
TheLTC®3459isalowcurrent,highefficiencysynchronous  
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  
anexternaldividerbetween2.5Vand10V.Althoughthepart  
is primarily intended for boost applications, VOUT will  
maintain regulation below VIN (at reduced efficiency).  
■
Small Solution Size  
■
>85% Efficiency over Wide Load Range  
■
Internal Synchronous Rectifier  
■
VIN 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® Operation  
■
■
Inrush Current Limiting  
Output Disconnect in Shutdown  
Ultralow Quiescent (10µA) and Shutdown  
(<1µA) Currents  
Low Profile (1mm) SOT-23 Package  
■
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 <1µA.  
■
■
U
APPLICATIO S  
■
General Purpose Micropower Boost  
The LTC3459 is offered in a low profile (1mm) 6-pin  
SOT-23 (ThinSOTTM) 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.  
■
Digital Cameras  
■
PDAs  
LCD Bias  
Small OLED Displays  
Supercap Charging  
■
■
■
U
TYPICAL APPLICATIO  
Efficiency  
5V to 8V Converter  
100  
V
V
= 5V  
IN  
OUT  
22µH  
= 8V  
90  
80  
70  
60  
50  
SW  
V
OUT  
8V  
5V  
V
IN  
V
OUT  
30mA  
2M  
47pF  
LTC3459  
OFF ON  
SHDN  
GND  
FB  
1µF  
4.7µF  
365k  
3459 TA01a  
0.01  
0.1  
1
10  
100  
I
(mA)  
LOAD  
3459 TA01b  
3459f  
1
1234567...12

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