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LTC4081

更新时间： 2024-02-20 18:35:03
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
24页 282K
描述
500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck

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LTC4081 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSON,
针数：10Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.22模拟集成电路 - 其他类型：BATTERY CHARGE CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：5.5 V最小输入电压：3.75 V
标称输入电压：5 VJESD-30 代码：S-PDSO-N10
JESD-609代码：e3长度：3 mm
湿度敏感等级：1功能数量：1
端子数量：10最高工作温度：85 °C
最低工作温度：最大输出电流：0.7 A
封装主体材料：PLASTIC/EPOXY封装代码：HVSON
封装形状：SQUARE封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：0.85 mm表面贴装：YES
切换器配置：BUCK最大切换频率：2750 kHz
技术：CMOS温度等级：OTHER
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3 mm
Base Number Matches：1

LTC4081 数据手册

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LTC4081  
500mA Li-Ion Charger  
with NTC Input and  
300mA Synchronous Buck  
U
DESCRIPTIO  
FEATURES  
Battery Charger:  
The LTC4081 is a complete constant-current/constant-  
voltage linear battery charger for a single-cell 4.2V  
lithium-ion/polymer battery with an integrated 300mA  
synchronous buck converter. A 3mm × 3mm DFN pack-  
age and low external component count make the LTC4081  
especially suitable for portable applications. Furthermore,  
the LTC4081 is specifically designed to work within USB  
power specifications.  
■
Constant-Current/Constant-Voltage Operation  
with Thermal Feedback to Maximize Charge Rate  
Without Risk of Overheating  
■
Internal 4.5 Hour Safety Timer for Termination  
■
Charge Current Programmable Up to 500mA with  
5% Accuracy  
■
NTC Thermistor Input for Temperature Qualified  
Charging  
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 LTC4081 battery charger also includes  
tricklecharge,automaticrecharge,soft-start(tolimitinrush  
current) and an NTC thermistor input used to monitor  
battery temperature.  
■
C/10 Charge Current Detection Output  
■
5μA Supply Current in Shutdown Mode  
Switching Regulator:  
■
High Efficiency Synchronous Buck Converter  
■
300mA Output Current (Constant-Frequency Mode)  
■
2.7V to 4.5V Input Range (Powered from BAT Pin)  
■
0.8V to V Output Range  
BAT  
■
The LTC4081 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.  
MODEPinSelectsFixed(2.25MHz)Constant-Frequency  
PWM Mode or Low I (23μA) Burst Mode® Operation  
CC  
■
■
2μA BAT Current in Shutdown Mode  
10-lead, low profile (0.75 mm) 3mm × 3mm DFN  
package  
U
APPLICATIO S  
The LTC4081 is available in a 10-lead, low profile (0.75  
mm) 3mm × 3mm DFN package.  
, 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. Protected by U.S. Patents,  
including 6522118.  
■
Wireless Headsets  
■
Bluetooth Applications  
■
Portable MP3 Players  
Multifunction Wristwatches  
■
U
Buck Efficiency vs Load Current  
(VOUT = 1.8V)  
TYPICAL APPLICATIO  
100  
80  
60  
40  
20  
0
1000  
100  
10  
Li-Ion Battery Charger with 1.8V Buck Regulator  
EFFICIENCY  
(Burst)  
510Ω  
EFFICIENCY  
(PWM)  
POWER  
LOSS  
V
CC  
(3.75V  
TO 5.5V)  
V
CHRG  
BAT  
CC  
500mA  
(PWM)  
EN_BUCK  
LTC4081  
4.2V  
100k  
+
1
Li-Ion/  
4.7μF  
POWER LOSS  
1OμH  
POLYMER  
BATTERY  
(Burst)  
NTC  
SW  
FB  
V
V
= 3.8V  
= 1.8V  
BAT  
OUT  
0.1  
0.01  
4.7μF  
10pF  
1M  
EN_CHRG  
L = 10μH  
C = 4.7μF  
V
OUT  
(1.8V/300mA)  
MODE GND PROG  
100k  
T
0.01  
0.1  
1
10  
100  
1000  
806Ω  
806k  
4.7μF  
LOAD CURRENT (mA)  
4081 TA01b  
4081 TA01a  
4081f  
1
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