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LT1308BCS8-TR

更新时间： 2024-11-11 05:43:23
品牌 Logo 应用领域
凌特 - Linear 转换器电池
页数 文件大小 规格书
20页 765K
描述
High Current, Micropower Single Cell, 600kHz DC/DC Converters

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LT1308BCS8-TR 数据手册

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LT1308A/LT1308B  
High Current, Micropower  
Single Cell, 600kHz  
DC/DC Converters  
U
DESCRIPTIO  
FEATURES  
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  
switchingatlightloadsandoperatesataquiescentcurrent  
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)  
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  
and does not need to be tied to VIN as on the LT1308. An  
internal VC clamp results in improved transient response  
and the switch voltage rating has been increased to 36V,  
enabling higher output voltage applications.  
■
Improved Accuracy Low-Battery Detector  
Reference: 200mV ±2%  
■
Available in 8-Lead SO and 14-Lead TSSOP Packages  
U
APPLICATIO S  
■
GSM/CDMA Phones  
■
Digital Cameras  
The LT1308A/LT1308B are available in the 8-lead SO and  
the 14-lead TSSOP packages.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst  
Mode is a registered trademark of Linear Technology Corporation. All other trademarks are  
the property of their respective owners.  
■
LCD Bias Supplies  
■
Answer-Back Pagers  
■
GPS Receivers  
■
Battery Backup Supplies  
■
Handheld Computers  
U
TYPICAL APPLICATIO  
Converter Efficiency  
L1  
D1  
4.7μH  
95  
5V  
1A  
V
= 3.6V  
V
= 4.2V  
= 2.5V  
IN  
IN  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
SW  
IN  
+
C1  
47μF  
R1*  
LBO  
LBI  
309k  
V
LT1308B  
IN  
+
Li-Ion  
CELL  
V
= 1.5V  
C2  
220μF  
IN  
SHUTDOWN  
SHDN  
FB  
V
GND  
C
R2  
100k  
47k  
100pF  
C1: AVX TAJC476M010  
C2: AVX TPSD227M006  
D1: IR 10BQ015  
L1: MURATA LQH6C4R7  
*R1: 887k FOR V = 12V  
OUT  
1308A/B F01a  
1
10  
100  
1000  
LOAD CURRENT (mA)  
Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter  
1308A/B F01b  
1308abfa  
1
1234567...20

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