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參數(shù)資料
| 型號(hào)： | SC1410A |
| 廠商： | Semtech Corporation |
| 英文描述： | Constant Voltage/Constant Current Battery Charger(恒定電壓/恒定電流電池充電器) |
| 中文描述： | 恒壓/恒流充電器（恒定電壓/恒定電流電池充電器） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 133K |
| 代理商： | SC1410A |
POWER MANAGEMENT
Description
1
www.semtech.com
SC1410A
Constant Voltage/Constant Current
Battery Charger
PRELIMINARY
Features
Applications
u
Chargers for NiCd, NiMH and Lithium batteries
u
Step down switching regulator with precision
adjustable current limit
Revision Feb 2001
Typical Application Circuits
The SC1410A is designed to provide a simple, fast charg-
ing solution for rechargeable batteries that require con-
stant-current and/or constant voltage charging, including
nickel-cadmium (NiCd), nickel-metal-hydride (NiMH) and
lithium-ion (Li-Ion). With a voltage reference accuracy of
0.5% the SC1410A satisfies the tight constant-voltage
charging requirements of lithium cells.
The SC1410A simplifies battery charger design by inte-
grating a high efficiency PWM with an internal 1.5A switch
and 0.1ohm current sense resistor, while the 500kHz
switching frequency allows a very small inductor to be used.
Only one external resistor is required to program the full
1.5A charging current to within 5% accuracy.
Charging circuits for batteries ranging from 2V to 18V are
easily implemented using the SC1410A. No ground sens-
ing of current is required, allowing the batterys negative
terminal to be connected directly to ground. No blocking
diode is required between the IC and the battery since the
SC1410A enters sleep mode and consumes only 3μA when
the AC adapter is unplugged. Other features include soft
start, overvoltage protection, and a shutdown pin. The
SC1410A is available in a 16 pin QSOP package.
u
Charges NiCd, NiMH and Lithium-lon batteries
u
High efficiency current mode with 1.5A internal
switch and sense resistor
u
3% Typical charging current accuracy
u
Precision 0.5% voltage reference for voltage mode
charging or over voltage protection
u
Current sensing can be either terminal of battery
u
Low reverse battery drain current: 3μA
u
Charging current soft start
u
Shutdown control
u
500kHz switching uses small inductor
Figure 2: Charging Lithium batteries
1uF
6.19k
240k
100k
NDS355N
22uF
Cout
11 to 18V
1k
1410 SCH42
+
4.2V
1N5819
0.1uF
0.22uF
33uH
300
1N4148
+
4.2V
10uF
Cin
SC1410A
SW
VCC
VC
PROG
SENSE
BOOST
BAT
GND
OVP
1N5819
Figure 1: 500kHz Li-lon cell phone charger
SC1410A
SW
VCC
VC
PROG
SENSE
BOOST
BAT
GND
OVP
10uH
1k
300
8.2 to 18V
NDS355N
22uF
Cout
1N4148
1410 SCH41
70.6k
1N5819
+
4.2V
1uF
0.22uF
10uF
Cin
1N5819
0.1uF
6.19k
100k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1410ACQSTRT | 制造商:Semtech Corporation 功能描述:IC, BATTERY CHARGER, 1.5A, QSOP-16, Battery Type:Li-Ion, NiCd, NiMH, Input Volta |
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