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LT1308B_15

更新时间： 2024-11-12 01:16:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 377K
描述
High Current, Micropower Single Cell, 600kHz DC/DC Converters

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LT1308B_15 数据手册

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LT1308A/LT1308B  
High Current, Micropower  
Single Cell, 600kHz  
DC/DC Converters  
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  
LT1308 and are recommended for use in new designs.  
The LT1308A features automatic shifting to power sav-  
ing Burst Mode operation at light loads and consumes  
just 140μA at no load. The LT1308B features continuous  
switching at light loads and operates at a quiescent cur-  
rent of 2.5mA. Both devices consume less than 1μA in  
shutdown.  
FEATURES  
n
5V at 1A from a Single Li-Ion Cell  
n
5V at 800mA in SEPIC Mode from Four NiCd Cells  
n
Fixed Frequency Operation: 600kHz  
n
Boost Converter Outputs up to 34V  
n
Starts into Heavy Loads  
n
Automatic Burst Mode™ Operation at  
Light Load (LT1308A)  
Continuous Switching at Light Loads (LT1308B)  
n
n
Low V  
Switch: 300mV at 2A  
CESAT  
n
n
n
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  
n
Available in 8-Lead SO and 14-Lead TSSOP Packages  
and does not need to be tied to V as on the LT1308. An  
IN  
internal V clamp results in improved transient response  
C
APPLICATIONS  
and the switch voltage rating has been increased to 36V,  
n
GSM/CDMA Phones  
Digital Cameras  
LCD Bias Supplies  
Answer-Back Pagers  
GPS Receivers  
Battery Backup Supplies  
Handheld Computers  
enabling higher output voltage applications.  
n
The LT1308A/LT1308B are available in the 8-lead SO and  
the 14-lead TSSOP packages.  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
n
n
n
n
TYPICAL APPLICATION  
Converter Efficiency  
L1  
95  
D1  
4.7μH  
V
= 3.6V  
V
= 4.2V  
= 2.5V  
IN  
IN  
5V  
1A  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
SW  
IN  
+
C1  
47μF  
R1*  
LBO  
LBI  
V
IN  
309k  
LT1308B  
V
= 1.5V  
+
IN  
Li-Ion  
CELL  
C2  
220μF  
SHUTDOWN  
SHDN  
FB  
GND  
V
C
R2  
100k  
47k  
100pF  
C1: AVX TAJC476M010  
C2: AVX TPSD227M006  
D1: IR 10BQ015  
L1: MURATA LQH6C4R7  
*R1: 887k FOR V = 12V  
OUT  
1
10  
100  
1000  
1308A/B F01a  
LOAD CURRENT (mA)  
Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter  
1308A/B F01b  
1308abfb  
1
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