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LT1317_15

更新时间： 2024-11-07 01:22:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 408K
描述
Micropower, 600kHz PWM DC/DC Converters

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LT1317_15 数据手册

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LT1317/LT1317B  
Micropower, 600kHz PWM  
DC/DC Converters  
U
DESCRIPTION  
FEATURES  
The LT®1317/LT1317B are micropower, fixed frequency  
step-up DC/DC converters that operate over a wide input  
voltage range of 1.5V to 12V. The LT1317 features auto-  
matic shifting to power saving Burst ModeTM operation at  
light loads. High efficiency is maintained over a broad  
300µA to 200mA load range. Peak switch current during  
Burst Mode operation is kept below 250mA for most  
operating conditions which results in low output ripple  
voltage, even at high input voltages. The LT1317B does  
notshiftintoBurstModeoperationatlightloads, eliminat-  
ing lowfrequency output rippleatthe expenseof light load  
efficiency.  
■
100µA Quiescent Current  
■
Operates with VIN as Low as 1.5V  
■
600kHz Fixed Frequency Operation  
Starts into Full Load  
■
■
Low-Battery Detector Active in Shutdown  
■
Automatic Burst Mode Operation at  
Light Load (LT1317)  
■
Continuous Switching at Light Loads (LT1317B)  
■
Low VCESAT Switch: 300mV at 500mA  
■
Pin for Pin Compatible with the LT1307/LT1307B  
U
APPLICATIONS  
The LT1317/LT1317B contain an internal low-battery de-  
tector with a 200mV reference that stays alive when the  
device goes into shutdown.  
■
Cellular Telephones  
■
Cordless Telephones  
■
Pagers  
No-load quiescent current of the LT1317 is 100µA and  
shuts down to 30µA. The internal NPN power switch  
handles a 500mA current with a voltage drop of just  
300mV.  
■
GPS Receivers  
■
Battery Backup  
■
Portable Electronic Equipment  
■
Glucose Meters  
■
Diagnostic Medical Instrumentation  
The LT1317/LT1317B are available in MS8 and SO-8  
packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
2-Cell to 3.3V Converter Efficiency  
L1  
10µH  
D1  
90  
2.2V  
3V  
IN  
IN  
+
C1  
V
LBI  
SW  
FB  
80  
70  
60  
50  
40  
IN  
47µF  
3.3V  
1.65V  
IN  
200mA  
LT1317  
R1  
1M  
1%  
2
SHUTDOWN  
SHDN  
V
C
LBO  
GND  
CELLS  
+
C2  
47µF  
R2*  
604k  
1%  
R
C
33k  
C
C
3.3nF  
D1: MBR0520  
L1: SUMIDA CD43-100  
* FOR 5V OUTPUT, R2 = 332k, 1%  
1317 F01  
0.3  
1
10  
100  
1000  
LOAD CURRENT (mA)  
Figure 1. 2-Cell to 3.3V Boost Converter  
1317 TA01  
1
1234567...16

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