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LT1308A

更新时间： 2024-09-09 22:34:31
品牌 Logo 应用领域
凌特 - Linear 转换器电池
页数 文件大小 规格书
12页 188K
描述
High Current, Micropower Single Cell, 600kHz DC/DC Converters

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LT1308A 数据手册

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Fina l Ele c tric a l Sp e c ific a tio ns  
LT1308A/ LT1308B  
Hig h Curre nt, Mic ro p o we r  
Sing le Ce ll, 600kHz  
DC/ DC Co nve rte rs  
Aug ust 1999  
U
FEATURES  
DESCRIPTION  
The LT®1308A/LT1308B are micropower, fixed frequency  
step-up DC/DC converters that operate over a 1V to 10V  
input voltage range. They are improved versions of the  
LT1308andarerecommendedforuseinnewdesigns.The  
LT1308A features automatic shifting to power saving  
Burst Mode operation at light loads and consumes just  
140µA at no load. The LT1308B features continuous  
switchingatlightloads andoperates ataquiescentcurrent  
of 2.5mA. Both devices consume less than 1µA in  
shutdown.  
■
5V at 1A from a Single Li-Ion Cell  
5V at 800mA in SEPIC Mode from Four NiCd Cells  
Fixed Frequency Operation: 600kHz  
Boost Converter Outputs up to 34V  
■
■
■
■
Starts into Heavy Loads  
Automatic Burst ModeTM Operation at  
■
Light Load (LT1308A)  
Continuous Switching at Light Loads (LT1308B)  
Low VCESAT Switch: 300mV at 2A  
Pin-for-Pin Upgrade Compatible with LT1308  
Lower Quiescent Current in Shutdown: 1µA (Max)  
Improved Accuracy Low-Battery Detector  
Reference: 200mV ±2%  
■
■
■
■
Low-battery detector accuracy is significantly tighter than  
the LT1308. The 200mV reference is specified at ±2% at  
room and ±3% over temperature. The shutdown pin  
enables the device when it is tied to a 1V or higher source  
■
U
APPLICATIONS  
■
and does not need to be tied to V as on the LT1308. An  
IN  
internal V clamp results in improved transient response  
C
GSM/CDMA Phones  
Digital Cameras  
LCD Bias Supplies  
Answer-Back Pagers  
GPS Receivers  
Battery Backup Supplies  
Handheld Computers  
and the switch voltage rating has been increased to 36V,  
enabling higher output voltage applications.  
■
■
■
The LT1308A/LT1308B are available in the 8-lead SO and  
14-lead TSSOP packages.  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
U
TYPICAL APPLICATION  
L1  
4.7µH  
Converter Efficiency  
D1  
5V  
1A  
95  
V
= 3.6V  
V = 4.2V  
IN  
IN  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
SW  
IN  
+
C1  
47µF  
R1*  
309k  
LBO  
LBI  
LT1308B  
+
Li-Ion  
CELL  
C2  
220µF  
V
IN  
= 2.5V  
SHUTDOWN  
SHDN  
V
C
FB  
GND  
V
IN  
= 1.5V  
R2  
100k  
47k  
100pF  
C1: AVX TAJC476M010  
C2: AVX TPSD227M006  
D1: IR 10BQ015  
L1: MURATA LQH6N4R7  
*R1: 169k FOR V  
= 3.3V  
= 12V  
OUT  
1308A/B F01  
887k FOR V  
OUT  
1
10  
100  
1000  
Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter  
LOAD CURRENT (mA)  
1308A/B F01a  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofits circuits as describedhereinwillnotinfringeonexistingpatentrights.  
1
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