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LT3653

更新时间： 2023-12-20 18:44:19
品牌 Logo 应用领域
亚德诺 - ADI 电池稳压器
页数 文件大小 规格书
12页 142K
描述
为电池充电器应用以及具输出电流限制功能的 1.2A、高电压输入稳压器

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中文翻译

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LT3653 数据手册

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LT3653  
1.2A, HV Input Regulator  
with Output Current Limit for  
Battery Charger Applications  
DESCRIPTION  
FEATURES  
TheLT®3653isamonolithiccurrentmodePWMstep-down  
regulatorwithprogrammableoutputcurrentlimit.Typically,  
it is used with battery charger power path controllers to  
pre-regulate the output and optimize the battery charger  
efficiency. Output current limit provides accurate control  
over system power dissipation.  
n
Wide Input Range:  
– Operation from 7.5V to 30V  
– Overvoltage Lockout Protects Circuit Through 60V  
Transients  
n
Operates with LTC Bat-Track™ Li-Ion Battery  
Chargers to Maximize Efficiency  
n
No Reverse Discharge Path from V  
to V  
IN  
OUT  
The wide operating input voltage range of 7.5V to 30V  
suits the LT3653 to a variety of input sources, including  
unregulated 12V wall adapters, 24V industrial supplies,  
Firewire and automotive power. Input overvoltage protec-  
tion allows the LT3653 to handle 60V input transients.  
n
n
n
n
n
Programmable Output Current Limit  
Integrated BOOST Diode  
Thermal Protection  
Small Application Size  
Thermally Enhanced 2mm × 3mm DFN Package  
TheLT3653controlpin,V ,isavailableforexternalbattery  
C
tracking control, Bat-Track. The LT3653 will block output  
APPLICATIONS  
discharge during an open or shorted input.  
n
Battery Powered Equipment  
The HVOK pin indicates that the internal bias supplies  
are present and no faults have occurred (i.e., overtem-  
perature and input overvoltage and undervoltage). The  
LT3653 includes a 1.5MHz frequency oscillator, internal  
compensation,andaninternalboostdiodetominimizethe  
number of external components. The LT3653 is available  
in an 8-lead (2mm × 3mm) package with exposed pads  
for low thermal resistance.  
n
Portable USB Devices – Cameras, MP3 Players,  
PDAs  
n
Automotive Battery Regulation  
n
Multiple-Source Battery Chargers  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Bat-Track is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
TYPICAL APPLICATION  
Efficiency vs Load Current  
High Voltage Single-Cell Battery Charger Application  
100  
0.1μF  
V
IN  
7.5V TO 30V  
TRANSIENT  
TO 60V  
BOOST  
SW  
V
IN  
90  
V
V
= 8V  
IN  
IN  
4.7μF  
27.4k  
80  
70  
60  
50  
40  
4.7μH  
V
= 12V  
IN  
LT3653  
= 24V  
I
SENSE  
1.2A  
SYSTEM  
LOAD  
I
V
OUT  
LIM  
10μF  
OUT  
HVOK  
WALL  
LTC4098  
BAT  
GND  
V
C
V
C
3653 TA01a  
+
0.1  
0.3  
0.5  
0.7  
0.9  
1.1  
1.3  
SINGLE-CELL  
Li-Ion  
OUTPUT CURRENT(A)  
3653 TA01a  
3653f  
1
1234567...12

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