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参数资料
| 型号： | MAX8856ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI+ 1CELL 14TDFN |
| 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： | 0 V ~ 14 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50m Ω Battery Switch in TDFN
Pin Description
PIN
1, 2
3
4
5
6
7
8
9
10
11
12
13, 14
—
NAME
BAT
IN
V L
THM
CHG
POK
GATE
EN2
EN1
GND
SETI
SYS
EP
FUNCTION
Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Connect
both BAT outputs together externally. During suspend mode, BAT is internally connected to SYS.
Supply Voltage Input. Connect IN to a 4.25V to 5.5V supply. Charging is suspended if V IN exceeds 6V.
Bypass IN to GND with a 4.7μF or larger ceramic capacitor.
+3.3V Output Voltage and Logic Supply. V L is regulated to +3.3V and is capable of sourcing 500μA to
provide power for external circuits. Bypass V L to GND with a 0.1μF or larger ceramic capacitor.
V L is internally pulled to GND during suspend mode.
Thermistor Input. Connect a 47k Ω NTC thermistor from THM to GND in close proximity to the battery to
monitor the battery temperature. The IC suspends charging when the temperature is outside the hot
and cold limits. Connect THM to GND to disable the thermistor monitoring function. See the THM Input
section for more details.
Charging Status Output. CHG is an open-drain output that goes low when the battery is charging. CHG
goes high impedance when the charge current drops below 50mA (typ) and the battery voltage is 4.2V
(typ). CHG is high impedance when the IC is in suspend mode.
Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is detected at IN.
MOSFET Enable/Disable Input. Drive GATE high to turn off the MOSFET between SYS and BAT,
resulting in opening of the connection between SYS and BAT. Drive GATE low to enable automatic
control of the MOSFET switch, as described in the Gate Input and SYS Output section.
Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the
MAX8856 into suspend mode (see Table 1).
Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the
MAX8856 into suspend mode (see Table 1).
Ground. Connect directly to exposed paddle under the IC.
Charge-Current Programming Input. Connect a resistor from SETI to GND to set the maximum charging
current. R SETI must be between 17.68k Ω and 35.36k Ω .
System Supply Output. SYS delivers up to 1A RMS to power an external system. Bypass SYS to GND
with a 4.7μF or larger ceramic capacitor. SYS is connected to BAT through an internal 50m Ω switch
when V BAT exceeds 3.5V or when the MAX8856 is in suspend mode.
Exposed Paddle. Connect to GND under the IC. Connect to a large ground plane to improve power
dissipation.
Detailed Description
The MAX8856 charger uses current, voltage, and ther-
mal control loops to charge and protect a single Li+
battery cell. It can start the system even when the bat-
tery is in deep saturation. The MAX8856 provides a
SYS output that supplies the external system with a
minimum 3.5V at 1A.
Two active-low enable inputs ( EN1 and EN2 ) are sup-
plied to set the SYS and charging current limits. During
prequal and fast-charge modes, the CHG output status
flag is pulled low. As the battery voltage approaches
4.2V, the charging current is reduced. When the charging
current drops below 50mA and the battery voltage equals
4.2V, the CHG output goes high impedance, signaling a
full battery. At any time during charging, if both EN1 and
EN2 are driven high, the MAX8856 enters suspend mode,
charging stops, and CHG goes high impedance.
EN1 and EN2 Inputs
EN1 and EN2 are logic inputs that enable the charger
and select the charging current (see Table 1). Drive
EN1 and EN2 high to place the IC in suspend mode.
6
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