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LT1307_15

更新时间： 2024-11-12 01:21:11
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凌特 - Linear /
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20页 379K
描述
Single Cell Micropower 600kHz PWM DC/DC Converters

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LT1307_15 数据手册

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LT1307/LT1307B  
Single Cell Micropower  
600kHz PWM DC/DC Converters  
U
FEATURES  
DESCRIPTIO  
The LT®1307/LT1307B are micropower, fixed frequency  
DC/DC converters that operate from an input voltage as  
low as 1V. First in the industry to achieve true current  
mode PWM performance from a single cell supply, the  
LT1307 features automatic shifting to power saving Burst  
Mode operation at light loads. High efficiency is main-  
tained over a broad 100µA to 100mA load range. The  
LT1307B does not shift into Burst Mode operation at light  
loads, eliminating low frequency output ripple at the  
expenseoflightloadefficiency. Thedevicescontainalow-  
battery detector with a 200mV reference and shut down to  
less than 5µA. No load quiescent current of the LT1307 is  
50µAandtheinternalNPNpowerswitchhandlesa500mA  
current with a voltage drop of just 295mV.  
■
Uses Small Ceramic Capacitors  
■
50µA Quiescent Current (LT1307)  
■
1mA Quiescent Current (LT1307B)  
■
Operates with VIN as Low as 1V  
■
600kHz Fixed Frequency Operation  
■
Starts into Full Load  
■
Low Shutdown Current: 3µA  
■
Low-Battery Detector  
■
3.3V at 75mA from a Single Cell  
Automatic Burst Mode® Operation at  
■
Light Load (LT1307)  
■
Continuous Switching at Light Load (LT1307B)  
■
Low VCESAT Switch: 295mV at 500mA  
U
Unlike competitive devices, large electrolytic capacitors  
are not required with the LT1307/LT1307B in single cell  
applications. The high frequency (600kHz) switching al-  
lows the use of tiny surface mount multilayer ceramic  
(MLC) capacitors along with small surface mount induc-  
tors. The devices work with just 10µF of output capaci-  
tance and require only 1µF of input bypassing.  
APPLICATIO S  
■
Pagers  
■
Cordless Telephones  
■
GPS Receivers  
Battery Backup  
■
■
Portable Electronic Equipment  
■
Glucose Meters  
The LT1307/LT1307B are available in 8-lead MSOP, PDIP  
and SO packages.  
■
Diagnostic Medical Instrumentation  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Single Cell to 3.3V Converter Efficiency  
L1  
10µH  
D1  
90  
C1: MURATA-ERIE GRM235Y5V105Z01  
MARCON THCS50E1E105Z  
TOKIN 1E105ZY5U-C103-F  
V
LBI  
LT1307  
SHDN  
V
SW  
FB  
IN  
C1  
3.3V  
80  
70  
60  
50  
C2: MURATA-ERIE GRM235Y5V106Z01  
MARCON THCS50E1E105Z  
1µF  
75mA  
V
IN  
= 1.5V  
V
R1  
1.02M  
1%  
TOKIN 1E106ZY5U-C304-F  
1.5V  
SHUTDOWN  
LBO  
GND  
CELL  
= 1V  
D1: MOTOROLA MBR0520L  
L1: COILCRAFT D01608C-103  
SUMIDA CD43-100  
IN  
C
C2  
10µF  
V
IN  
= 1.25V  
R2  
604k  
1%  
100k  
680pF  
MURATA ERIE LQH3C100  
FOR 5V OUTPUT: R1 = 1M, R2 = 329k  
1307 F01  
0.1  
1
10  
100  
Figure 1. Single Cell to 3.3V Boost Converter  
LOAD CURRENT (mA)  
1307 TA01  
1307fa  
1
1234567...20

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