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参数资料
| 型号： | ADP2291RM-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ADP2291 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADP2291 |
| 主要属性： | 锂离子电池，750mA 时为 4.2V 输出，4.5 ~ 5.5 Vin |
| 次要属性： | LED 状态指示器，深度放电，预充电，热关闭模式 |
| 已供物品： | 板 |
ADP2291
TYPICAL APPLICATION CIRCUIT
A typical application circuit is shown in Figure 22. The circuit is
capable of a 750 mA charge current for an input voltage of 4.5 V
INPUT
4.6V–12V
D1
BAT1000
CIN
2.2 μ F
RS
200m ?
CS
Q1
FZT549
DRV
COUT
10 μ F
+
LI-ION
CELL
to 6 V. Higher input voltages can be used, but the increased power
IN
BAT
dissipation of the pass device must be taken into account.
CHG
ADP2291
GND
INPUT
4.6V–12V
D1
BAT1000
CIN
2.2 μ F
RS
200m ?
CS
Q1
FZT549
DRV
COUT
10 μ F
+
LOW/HIGH
TIMER
CTIMER
100nF
ADJ
R2
100k ?
Q2
2N7002
IN
ADP2291
BAT
CHG
GND
Figure 24. Selectable Charge Current Circuit
TIMER
CTIMER
100nF
ADJ
THERMAL PROTECTION
Figure 22. Typical Application Circuit
CHARGE TERMINATION
In some applications, the charger is required to terminate charg-
ing when the EOC threshold is reached. Automatic charger
restart is not desired. Adding components R1, C1, and Q2
terminates charging when the CHG pin opens and prevents
In applications where the overall size must be small or the input
voltage range is wide, adding thermal regulation is suggested.
This allows the charger to monitor the temperature of the pass
device and decrease the charge current as the temperature
increases. By adding an NTC thermistor to the ADJ pin, it is
possible to accomplish this; however, care is still required to
ensure that the power dissipation of the pass device is not
exceeded.
further charging until the adapter is removed and reasserted.
INPUT
D1
BAT1000
RS
200m ?
Q1
FZT549
INPUT
4.6V–12V
D1
BAT1000
RS
200m ?
Q1
FZT549
+
4.6V–12V
CIN
2.2 μ F
CS
DRV
COUT
10 μ F
+
LI-ION
CELL
CIN
2.2 μ F
CS
DRV
COUT
10 μ F
LI-ION
CELL
IN
ADP2291
BAT
R1
500k ?
IN
ADP2291
BAT
CHG
TIMER
ADJ
GND
CHG
TIMER
ADJ
GND
CTIMER
100nF
R1
470k
NTC LOCATED
CTIMER
100nF
Q2
NEAR Q1
R2
100k
C1
2N7002
100nF
Figure 25. Thermal Regulation Circuit
Figure 23. Self-Termination Circuit
SELECTABLE CHARGE CURRENT
Table 6. NTC Thermistor Manufacturers
In applications where the charge current needs to be selectable,
use the circuit shown in Figure 24. This circuit allows a proces-
sor to determine if the charge current needs to be reduced due
to an input source limitation or a different battery capacity
option or simply to reduce the stress on the pass transistor.
Vendor
BetaTHERM
Murata
Panasonic
Vishay
Part Number
SMD2500KJ435J
NCP18WM474J
ERTJ0EV474J
2322 615 1.474
Website
www.betatherm.com
www.murata .com
www.panasonic.com
www.vishay.com
R2 and Q2 allow the charge current to be selected between
high, which results in a charge current of 750 mA; and low,
which results in a charge current of 250 mA.
Rev. A | Page 14 of 20
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