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LTC4080

更新时间： 2024-09-24 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 电池转换器
页数 文件大小 规格书
22页 458K
描述
内置 300mA 同步降压型转换器的 500mA 独立型锂离子电池充电器

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中文翻译

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LTC4080 数据手册

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LTC4080  
500mA Standalone Li-Ion  
Charger with Integrated  
300mA Synchronous Buck  
DESCRIPTION  
The LTC®4080 is a complete constant-current/constant-  
voltage linear battery charger for a single-cell 4.2V  
lithium-ionbatterywithanintegrated300mAsynchronous  
buck converter. The small packages and low external  
component count make the LTC4080 especially suitable  
forportableapplications.Furthermore,LTC4080isspecifi-  
cally designed to work within USB power specifications.  
FEATURES  
n
Complete Linear Battery Charger with Integrated  
Buck Converter  
Battery Charger:  
n
Constant-Current/Constant-Voltage Operation  
with Thermal Feedback to Maximize Charge Rate  
without Risk of Overheating  
n
Internal 4.5-Hour Safety Timer for Termination  
n
Charge Current Programmable Up to 500mA with  
The CHRG pin indicates when charge current has  
dropped to ten percent of its programmed value (C/10).  
An internal 4.5-hour timer terminates the charge cycle.  
The full-featured LTC4080 battery charger also includes  
trickle charge, automatic recharge and soft-start (to limit  
inrush current).  
5% Accuracy  
n
C/10 Charge Current Detection Output  
n
5µA Supply Current in Shutdown Mode  
Switching Regulator:  
n
High Efficiency Synchronous Buck Converter  
n
300mA Output Current  
The LTC4080 integrates a synchronous buck converter  
that is powered from the BAT pin. It has an adjustable  
output voltage and can deliver up to 300mA of load cur-  
rent. The buck converter also features low current high  
efficiency Burst Mode operation that can be selected by  
the MODE pin.  
n
2.7V to 4.5V Input Range (Powered from BAT Pin)  
n
0.8V to V Output Range  
BAT  
n
MODE Pin Selects Fixed (2.25MHz) Constant-Frequency  
PWM Mode or Low I (23µA) Burst Mode® Operation  
CC  
n
2µA BAT Current in Shutdown Mode  
The LTC4080 is available in 10-lead, low profile (0.75mm)  
3mm × 3mm DFN and MSOP Exposed Pad packages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
6522118.  
APPLICATIONS  
n
Wireless Headsets  
n
Bluetooth Applications  
Portable MP3 Players  
n
n
Multifunction Wristwatches  
Buck Efficiency vs Load Current  
(VOUT = 1.8V)  
TYPICAL APPLICATION  
Li-Ion Battery Charger with 1.8V Buck Regulator  
100  
80  
60  
40  
20  
0
1000  
100  
10  
500mA  
EFFICIENCY  
(Burst)  
4.2V  
V
CC  
V
BAT  
CC  
EFFICIENCY  
(PWM)  
C
+
Li-Ion  
BAT  
(3.75V  
to 5.5V)  
POWER  
LOSS  
(PWM)  
EN_BUCK  
4.7μF  
BATTERY  
L1, 1OμH  
EN_CHRG  
MODE  
SW  
C
R1  
1M  
PL  
LTC4080  
0
10pF  
V
POWER LOSS  
(Burst)  
OUT  
(1.8V/300mA)  
FB  
C
IN  
V
V
= 3.8V  
= 1.8V  
GND PROG  
BAT  
OUT  
4.7μF  
0.1  
0.01  
R2  
806k  
C
OUT  
4.7μF  
R
PROG  
L = 10μH  
C = 4.7μF  
806Ω  
4080 TA01a  
0.01  
0.1  
1
10  
100  
1000  
LOAD CURRENT (mA)  
4080 TA01b  
4080fc  
1
For more information www.linear.com/LTC4080  
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