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LT1306

更新时间： 2024-02-27 03:45:46
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 217K
描述
Synchronous, Fixed Frequency Step-Up DC/DC Converter

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中文翻译

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LT1306 数据手册

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LT1306  
Synchronous, Fixed Frequency  
Step-Up DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
■
Output Disconnected from Input During Shutdown  
The LT®1306 is a fully integrated, fixed frequency syn-  
chronous boost converter capable of generating 5V at 1A  
from a Li-Ion cell. The device contains both the main  
power switch and synchronous rectifier on chip and  
automatically disconnects the output from the input in  
shutdown, eliminating the need for external load discon-  
nect circuitry. Additionally, the output remains regulated  
when VIN exceeds VOUT, allowing difficult step-up/step-  
down converter functions to be easily realized using a  
single inductor.  
■
Output Voltage Remains Regulated  
When VIN > VOUT  
■
Controlled Input Current During Start-Up  
■
300kHz Current Mode PWM Operation  
■
Can Be Externally Synchronized  
■
Internal 2A Switches  
■
Operates with VIN as Low as 1.8V  
■
Automatic Burst Mode Operation at Light Loads  
■
Quiescent Current: 160µA  
Shutdown Current: 9µA Typ  
■
The internal 300kHz oscillator of the LT1306 can be easily  
synchronizedtoanexternalclockfrom425kHzto500kHz.  
This allows switching harmonics to be tightly controlled  
and eliminates any beat frequencies that may result from  
amultifrequencysystem.TheLT1306automaticallyshifts  
into power saving Burst ModeTM operation at light loads.  
At heavy loads the LT1306 operates in fixed frequency  
current mode. No-load quiescent current is 160µA and  
reduces to 9µA in shutdown mode.  
U
APPLICATIO S  
■
Satellite Phones  
■
Portable Instruments  
■
Personal Digital Assistants  
Palmtop Computers  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
The LT1306 is available in an SO-8 package.  
Burst Mode is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
D1  
Efficiency  
90  
C1  
1µF  
L1  
10µH  
1-CELL  
Li-Ion  
85  
80  
75  
70  
65  
60  
V
IN  
= 4.2V  
V
SW CAP  
OUT  
IN  
V
= 3.6V  
IN  
5V  
1A  
S/S  
R1  
V
IN  
= 2.6V  
LT1306  
+
768k  
C
IN1  
22µF  
C
IN2  
0.1µF  
FB  
+
V
GND  
C
C
C
O1  
O2  
220µF  
1µF  
V
= 5V  
O
R3  
R2  
249k  
C
C
C
: AVX TAJC226M010  
IN1  
L1 = 10µH  
C
P
118k  
C
Z
68nF  
: AVX TPSE227M010R0100  
O1  
(FIGURE 1)  
68pF  
, C : CERAMIC  
IN1 O2  
C1: AVX TAJA105K020  
D1: MMBD914LT1  
L1: CTX10-2  
1
10  
100  
1000  
LOAD CURRENT (mA)  
1306 F01  
1306 TA01  
Figure 1. Single Li-Ion Cell to 5V Converter  
1
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