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LTC4012CUF-3-PBF PDF预览

LTC4012CUF-3-PBF

更新时间： 2024-02-13 13:36:01
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
28页 369K
描述
High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

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LTC4012CUF-3-PBF 数据手册

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LTC4012-3  
High Efficiency,  
Multi-Chemistry Battery Charger  
with PowerPath Control  
FeaTures  
DescripTion  
The LTC®4012-3 is a constant-current/constant-voltage  
n
General Purpose Battery Charger Controller  
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 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  
generateaudiblenoisewithceramicbulkcapacitors.Charge  
current is set by external resistors and can be monitored  
as an output voltage across the programming resistor.  
With no built-in termination, the LTC4012-3 charges a  
wide range of batteries under external control.  
n
n
n
n
nꢀ  
n
TheLTC4012-3featuresfullyadjustableoutputvoltage.For  
charge management and safety, the IC includes an input  
P-channelMOSFETidealdiodecontroller,battery(output)  
overvoltageprotection,reversechargecurrentprotection,  
PWM soft-start and robust non-overlap control for an all  
N-channel MOSFET PWM power stage.  
n
n
n
n
n
Micropower Shutdown  
20-Pin 4mm × 4mm × 0.75mm QFN Package  
ThedeviceincludesACadapterinputcurrentlimiting,which  
maximizes the 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  
Portable Instruments  
n
n
Battery Backup Systems  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents including 5723970.  
The CHRG status pin is active during all charging modes,  
including special indication for low charge current.  
Typical applicaTion  
FROM  
ADAPTER  
25mΩ  
POWER TO  
SYSTEM  
Efficiency at DCIN = 20ꢄ  
0.1µF  
13V TO 20V  
20µF  
5.1k  
100  
95  
90  
85  
80  
75  
70  
10000  
1000  
100  
INFET  
DCIN  
CLP  
CLN  
BOOST  
EFFICIENCY  
0.1µF  
0.1µF  
TGATE  
SW  
POWER LOSS  
CHRG INTV  
DD  
2µF  
TO/FROM  
MCU  
6.8µH  
33mΩ  
ICL  
BGATE  
GND  
V
= 12.3V  
OUT  
SHDN  
ITH  
R
R
R
= 33mΩ  
SENSE  
= 3.01k  
3.01k  
3.01k  
IN  
PROG  
CSP  
= 26.7k  
2.5  
6.04k  
LTC4012-3  
0
1
1.5  
2
3
0.5  
0.1µF  
CSN  
CHARGE CURRENT (A)  
BAT  
FBDIV  
PIN 5 NAME  
PROG  
20µF  
PART  
LTC4012  
LTC4012-3  
GND  
ACP  
301k  
+
26.7k  
4.7nF  
X
12.3V  
V
FB  
X
4012-3 TA02  
Li-Ion  
32.8k  
BATTERY  
4012-3 TA01  
40123fb  
ꢀ
1234567...28

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