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参数资料
| 型号： | MAX1879EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ PULSE 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.4 V ~ 22 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
Simple, Efficient, 1-Cell Li+ Pulse Charger
Typical Operating Characteristics
(V IN = CHG = +10V, V BATT = +4.2V, THERM = 10k ? to GND, T A = +25 ° C, unless otherwise noted.)
1.020
NORMALIZED TIMER PERIOD
vs. AMBIENT TEMPERATURE
1.0020
NORMALIZED BATTERY REGULATION
VOLTAGE vs. TEMPERATURE
9.0
PRECHARGE CURRENT
vs. INPUT VOLTAGE
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
NORMALIZED TO +25 ° C
1.0015
1.0010
1.0005
1.0000
0.9995
0.9990
0.9985
0.9980
0.9975
0.9970
NORMALIZED TO +25 ° C
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
7.2
7.0
V BATT = 0
V BATT = 2V
-40
-20
0 20
40
60
80
-40
-20
0 20 40
60
80
5
10
15
20
25
TEMPERATURE ( ° C)
TEMPERATURE ( ° C)
V IN (V)
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
IN
GATE
CHG
TSEL
ADJ
GND
THERM
BATT
FUNCTION
Input Voltage from Current-Limited Voltage Source (+22V max). Bypass to GND with a 0.1μF capacitor.
Gate Drive for External PMOS Pass Element. The PMOS device should have a V GS threshold less than
2.5V. See Selecting External Components .
Charge Status Indication. A CHG low indicates that the MAX1879 is charging a battery. CHG goes high
when the on/off duty cycle falls to 1/8, indicating that the battery is charged to approximately 95% of full
capacity. CHG is an open-drain current-limited N-channel MOSFET suitable for directly driving an LED.
Connect a pullup resistor to the logic supply to generate a logic-level signal. CHG blinks at 2Hz during the
Prequalification state (2.2V < V BATT < 2.5V) and during a temperature fault.
Minimum ON/OFF Pulse Width Selection (Table 2)
Battery Regulation Voltage Adjustment. Bypass to GND with a 1000pF capacitor. Connect a resistor from
ADJ to GND to reduce the nominal +4.200V regulation set point. See Adjusting the Battery Regulation
Voltage .
Ground. See Layout Guidelines for information on system grounding. Connect the battery ’ s negative
terminal to GND.
Thermistor Temperature-Sensor Input. Connect an NTC thermistor (10k ? at +25 ° C) from THERM to GND to
allow prequalification of the cell temperature for fast-charge. Replace the thermistor with a 10k ? resistor if
temperature sensing is not required.
Cell Voltage Monitor Input, Precharge Current Output, and MAX1879 Power Source. Connect BATT to the
positive terminal of a single Li+ cell. Bypass BATT with a capacitor to ground (1.5μF per amp of charge
current).
_______________________________________________________________________________________
5
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