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LTC3429_15

更新时间： 2024-09-26 01:18:27
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 204K
描述
600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect

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中文翻译

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LTC3429_15 数据手册

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LTC3429/LTC3429B  
600mA, 500kHz Micropower  
Synchronous Boost Converter  
with Output Disconnect  
U
FEATURES  
DESCRIPTIO  
■
Up to 96% Efficiency  
The LTC®3429/LTC3429B are high efficiency synchro-  
nous,fixedfrequency,step-upDC/DCconverterswithtrue  
output load disconnect, inrush current limiting and soft-  
start in a low profile 6-lead ThinSOTTM package. These  
devices are capable of supplying 100mA from a single AA  
cell input or 250mA from a 2-cell AA with a 3.3V output.  
■
True Output Load Disconnect  
■
Inrush Current Limiting and Internal Soft-Start  
■
Low Voltage Start-Up: 0.85V  
Automatic Burst Mode® Operation with IQ ~ 20µA  
■
■
Continuous Switching at Light Loads (LTC3429B)  
■
Internal Synchronous Rectifier  
A switching frequency of 500kHz minimizes overall solu-  
tion footprint by allowing the use of tiny, low profile  
inductors and ceramic capacitors. Current mode PWM  
control with internal compensation reduces external parts  
counttherebysavingcriticalboardrealestate.TheLTC3429  
shiftsautomaticallytopowersavingBurstModeoperation  
at light loads while the LTC3429B features continuous  
switching at light loads. Antiringing control circuitry re-  
duces EMI concerns by damping the inductor in discon-  
tinuous mode.  
■
Current Mode Control with Internal Compensation  
■
Short-Circuit Protection  
■
500kHz Fixed Frequency Switching  
■
Input Range: 0.5V to 4.4V  
■
Output Range: 2.5V to 4.3V (Up to 5V with Schottky)  
■
Shutdown Current: <1µA  
■
Antiringing Control Minimizes EMI  
■
Tiny External Components  
■
Low Profile (1mm) SOT-23 Package  
U
The devices also feature low shutdown current of under  
1µA. The true output disconnect feature allows the output  
to be completely discharged in shutdown. It also limits the  
inrush of current during start-up, minimizing surge cur-  
rents seen by the input supply.  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Burst Mode is a registered  
trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology  
Corporation.  
APPLICATIO S  
■
MP3 Players  
■
Digital Cameras  
■
LCD Bias Supplies  
Handheld Instruments  
Wireless Handsets  
GPS Receivers  
■
■
■
U
TYPICAL APPLICATIO  
2-Cell to 3.3V Efficiency  
100  
100  
V
= 3V  
IN  
4.7µH  
90  
80  
10  
1
EFFICIENCY  
+
2-CELL  
AA  
V
= 2.4V  
= 2.4V  
IN  
4.7µF  
SW  
V
OUT  
3.3V  
V
V
IN  
LTC3429  
SHDN FB  
GND  
OUT  
250mA  
70  
60  
0.1  
V
1.02M  
604k  
IN  
10µF  
OFF  
ON  
V
= 3V  
IN  
0.01  
POWER LOSS  
50  
40  
0.001  
3429 F01a  
0.0001  
1000  
0.1  
1
10  
100  
Figure 1. 2-Cell to 3.3V Synchronous Boost Converter  
OUTPUT CURRENT (mA)  
3429 F01b  
3429fa  
1
1234567...12

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