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LTC4012-1

更新时间： 2024-02-24 01:33:10
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
28页 313K
描述
High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control

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LTC4012-1 数据手册

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LTC4012/  
LTC4012-1/LTC4012-2  
High Efficiency,  
Multi-Chemistry Battery Charger  
with PowerPath Control  
DESCRIPTION  
FEATURES  
n
General Purpose Battery Charger Controller  
The LTC4012 is a constant-current/constant-voltage  
n
Efficient 550kHz Synchronous Buck PWM Topology  
0ꢀ5ꢁ ꢂutput ꢃloat ꢄoltage Accuracy  
Programmable Charge Current: 4ꢁ Accuracy  
Programmable AC Adapter Current Limit:  
3ꢁ Accuracy  
No Audible Noise with Ceramic Capacitors  
INꢃET Low Loss Ideal Diode PowerPath™ Control  
Wide Input Voltage Range: 6V to 28V  
Wide Output Voltage Range: 2V to 28V  
Indicator Outputs for AC Adapter Present, Charging,  
C/10 Current Detection and Input Current Limiting  
Analog Charge Current Monitor  
battery charger controller. It uses a synchronous  
quasi-constant frequency PWM control architecture  
that will not generate audible noise with ceramic  
bulk capacitors. Charge current is set by external  
resistors and can be monitored as an output voltage.  
With no built-in termination, the LTC4012 family charges  
a wide range of batteries under external control.  
n
n
n
n
n
n
n
n
TheLTC4012featuresfullyadjustableoutputvoltage,while  
theLTC4012-1andLTC4012-2canbepin-programmedfor  
Lithium-Ion/Polymerbatterypacksof1-, 2-, 3-or4-series  
cells. The LTC4012-1 provides output voltage of 4.1V/cell  
and the LTC4012-2 is a 4.2V/cell version.  
n
n
n
Micropower Shutdown  
20-Pin 4mm × 4mm × 0.75mm QFN Package  
ThedeviceincludesACadapterinputcurrentlimiting,which  
maximizes charge rate for a fixed input power level. An  
external sense resistor programs the input current limit,  
and the ICL status pin indicates reduced charge current as  
a result of AC adapter current limiting. Ideal diode control  
at the adaptor input improves charger efficiency.  
APPLICATIONS  
n
Notebook Computers  
n
Portable Instruments  
n
Battery Backup Systems  
The CHRG status pin is active during all charging modes,  
including special indication for low charge current.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath  
is a trademark of Linear Technology Corporation. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents including 5723970.  
TYPICAL APPLICATION  
FROM  
ADAPTER  
25mΩ  
Efficiency at DCIN = 20ꢄ  
POWER TO  
SYSTEM  
0.1μF  
13V TO 28V  
20μF  
100  
95  
90  
85  
80  
75  
70  
10000  
1000  
100  
5.1k  
INFET  
DCIN  
CLP  
EFFICIENCY  
CLN  
BOOST  
0.1μF  
0.1μF  
TGATE  
ACP  
POWER LOSS  
SW  
CHRG INTV  
DD  
TO/FROM  
MCU  
2μF  
ICL  
BGATE  
GND  
6.8μH  
33mΩ  
V
= 12.3V  
OUT  
R
R
R
= 33mΩ  
SENSE  
= 3.01k  
SHDN  
ITH  
IN  
PROG  
3.01k  
3.01k  
= 26.7k  
CSP  
6.04k  
0
1
1.5  
2
2.5  
3
0.5  
LTC4012  
CHARGE CURRENT (A)  
0.1μF  
CSN  
BAT  
PIN NAME  
FBDIV  
PROG  
20μF  
PART INꢃET DCDIꢄ  
301k  
+
LTC4009  
LTC4012  
X
26.7k  
4.7nF  
12.3V  
V
FB  
X
4012 TA02  
Li-Ion  
32.8k  
BATTERY  
4012 TA01  
4012f  
1
1234567...28

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