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LTC1980_1

更新时间： 2024-11-05 05:43:43
品牌 Logo 应用领域
凌特 - Linear 转换器电池
页数 文件大小 规格书
16页 235K
描述
Combination Battery Charger and DC/DC Converter

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中文翻译

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LTC1980_1 数据手册

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LTC1980  
Combination Battery  
Charger and DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
The LTC®1980 integrates PWM power control for charg-  
ing a battery and converting the battery voltage to a  
regulated output or simultaneously charging the battery  
whilepoweringasystemloadfromanunregulatedACwall  
adapter. Combining these features into a single IC pro-  
duces a smaller area and lower cost solution compared to  
presentlyavailablemulti-ICsolutions.TheLTC1980shares  
the discrete components for both the battery charger and  
theDC/DCconverterthusminimizingsizeandcostrelative  
to dual controller solutions. Both the battery charger and  
DC/DC converter use a current mode flyback topology for  
high efficiency and excellent transient response. Optional  
BurstModeoperationandpower-downmodeallowpower  
density, efficiency and output ripple to be tailored to the  
application.  
■
Single Controller IC Includes Battery Charger  
Plus DC/DC Converter  
■
Wall Adapter Voltage May be Above or Below  
Battery Voltage  
■
LDO Controller Allows Simultaneous Charging  
and Regulating from Wall Adapter Input  
■
Standalone Li-Ion Battery Charger Including Charge  
Termination, Overvoltage Protection, Shorted-Cell  
Detection and Battery Recharge  
■
■
■
Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages  
Simple NiMH and NiCd Battery Charger  
Pin Programmable Regulator Burst Mode® Operation  
and Shutdown for High Efficiency  
High Efficiency Current Mode 300kHz PWM  
Reduced Component Architecture  
Undervoltage Protection and Soft-Start Ensures  
Start-Up with Current Limited Wall Adapter  
Small 24-Pin SSOP Package  
■
■
■
The LTC1980 provides a complete Li-Ion battery charger  
with charge termination timer, preset Li-Ion battery volt-  
ages, overvoltage and undervoltage protection, and user-  
programmableconstant-currentcharging.Automaticbat-  
tery recharging, shorted-cell detection, and open-drain  
C/10 and wall plug detect outputs are also provided. User  
programming allows NiMH and NiCd battery chemistries  
to be charged as well.  
■
U
APPLICATIO S  
■
Digital Cameras  
■
Handheld Computers  
■
Personal Digital Assistants  
1W to 10W Uninterruptable Power Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
Patents Pending.  
■
U
TYPICAL APPLICATIO  
Li-Ion Charger and DC/DC Converter Using One IC  
3.3V Regulator Efficiency vs Load Current  
POWER FLOW  
90  
CHARGING  
BATTERY  
OPERATION  
UNREGULATED  
85  
80  
75  
70  
65  
60  
WALL ADAPTER  
Li-Ion  
BATTERY  
•
INPUT (3V TO 10V)  
SYSTEM  
POWER  
BAT-FET  
REG-FET  
•
LDO/  
SWITCH  
V
A
FIGURE 5  
= 3.6V  
3.3V  
1.8V  
1.5V  
BAT  
= 25°C  
SYSTEM LOAD  
T
DC/DC  
CONVERTERS  
10  
100  
1000  
LTC1980  
LOAD CURRENT (mA)  
1980 TA01  
1980 G04  
1980f  
1
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