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LT1510_15

更新时间： 2024-01-10 00:50:38
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
16页 295K
描述
Constant-Voltage/ Constant-Current Battery Charger

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LT1510_15 数据手册

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LT1510/LT1510-5  
Constant-Voltage/  
Constant-Current Battery Charger  
FEATURES  
■
plest, most efficient solution to fast-charge modern re-  
chargeablebatteriesincludinglithium-ion(Li-Ion), nickel-  
metal-hydride (NiMH)* and nickel-cadmium (NiCd)* that  
require constant-current and/or constant-voltage charg-  
ing. The internal switch is capable of delivering 1.5A DC  
current (2A peak current). The 0.1Ω onboard current  
sense resistor makes the charging current programming  
very simple. One resistor (or a programming current from  
a DAC) is required to set the full charging current (1.5A) to  
within 5% accuracy. The LT1510 with 0.5% reference  
voltageaccuracymeetsthecriticalconstant-voltagecharg-  
ing requirement for lithium cells.  
Charges NiCd, NiMH and Lithium-Ion Batteries ––  
Only One 1/10W Resistor Is Needed to Program  
Charging Current  
■
High Efficiency Current Mode PWM with 1.5A  
Internal Switch and Sense Resistor  
■
3% Typical Charging Current Accuracy  
■
Precision 0.5% Voltage Reference for Voltage  
Mode Charging or Overvoltage Protection  
■
Current Sensing Can Be at Either Terminal of  
the Battery  
■
Low Reverse Battery Drain Current: 3µA  
■
Charging Current Soft Start  
Shutdown Control  
500kHz Version Uses Small Inductor  
■
The LT1510 can charge batteries ranging from 2V to 20V.  
Groundsensingofcurrentisnotrequiredandthebattery’s  
negative terminal can be tied directly to ground. A saturat-  
ingswitchrunningat200kHz(500kHzforLT1510-5)gives  
high charging efficiency and small inductor size. A block-  
ing diode is not required between the chip and the battery  
becausethechipgoesintosleepmodeanddrainsonly3µA  
when the wall adaptor is unplugged. Soft start and shutdown  
featuresarealsoprovided.TheLT1510isavailableina16-pin  
fused lead power SO package with a thermal resistance of  
50°C/W, an 8-pin SO and a 16-pin PDIP.  
■
U
APPLICATIONS  
■
Chargers for NiCd, NiMH and Lithium Batteries  
Step-Down Switching Regulator with Precision  
Adjustable Current Limit  
■
U
DESCRIPTION  
Withswitchingfrequencyashighas500kHz,TheLT®1510  
current mode PWM battery charger is the smallest, sim-  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
* NiCd and NiMH batteries require charge termination circuitry (not shown in Figure 1).  
U
TYPICAL APPLICATIONS  
D3  
C1  
D1  
1N5819  
D3  
11V TO 28V  
0.22µF  
C1  
0.22µF  
1N5819  
D1  
MBRM120T3  
SW  
V
CC  
8.2V TO 20V  
MBRM120T3  
+
+
SW  
V
CC  
C
*
IN  
+
–
+
10µF  
C
*
IN  
+
–
10µF  
BOOST  
PROG  
1µF  
BOOST  
PROG  
L1**  
33µH  
300Ω  
3.83k  
1µF  
LT1510  
L1**  
10µH  
300Ω  
D2  
1N914  
6.19k  
LT1510-5  
D2  
MMBD914L  
GND  
V
0.1µF  
C
1k  
GND  
V
0.1µF  
C
1k  
OVP  
OVP  
SENSE  
BAT  
+
SENSE  
BAT  
C
OUT  
4.2V  
+
22µF  
†
+
C
OUT  
22µF  
***  
Q3  
4.2V  
TANT  
+
†
VN2222  
Q3  
4.2V  
2N7002  
R3  
240k  
R3  
70.6k  
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED  
* TOKIN OR MARCON CERAMIC SURFACE MOUNT  
** COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)  
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)  
0.25%  
0.25%  
R4  
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED  
TOKIN OR MARCON CERAMIC SURFACE MOUNT  
100k  
0.25%  
R4  
*
100k  
0.25%  
***  
PANASONIC EEFCD1B220  
1510 F02  
** COILTRONICS CTX33-2  
OPTIONAL, SEE APPLICATIONS INFORMATION  
†
1510 F01  
†
OPTIONAL, SEE APPLICATIONS INFORMATION  
Figure 1. 500kHz Smallest Li-Ion Cell Phone Charger (0.8A)  
Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%)  
1
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