參數(shù)資料
型號: MAX1811
廠商: Maxim Integrated Products, Inc.
英文描述: USB-Powered Li+ Charger
中文描述: USB供電、Li+充電器
文件頁數(shù): 5/8頁
文件大?。?/td> 167K
代理商: MAX1811
M
USB-Powered Li+ Charger
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
DESCRIPTION
1
SELV
Battery Regulation Voltage-Select Input. A low (< 0.8V) selects a 4.1V battery regulation set point. A high
(> 2.0V) selects a 4.2V battery regulation set point.
2
SELI
Battery Regulation Current-Select Input. A low (< 0.8V) selects a 100mA maximum battery regulation
current. A high (> 2.0V) selects a 500mA maximum battery regulation current. SELI is not diode clamped
to IN, and the voltage at V
SELI
can exceed the voltage at V
IN
.
3, 6
GND
Ground. Connect pins 3 and 6 to a large copper trace for maximum power dissipation.
4
IN
Input Supply Voltage. Bypass with a 4.7μF capacitor to GND.
5
BATT
Li+ Battery Connection. Bypass with a capacitor no less than 2.2μF to GND. High impedance in
shutdown.
7
EN
Enable Input. A high (> 2.0V) enables the device. A low (< 0.8V) disables the device and places it into
shutdown mode. BATT is high impedance when disabled.
8
CHG
Charging Indicator Open-Drain Output.
CHG
pulls low while the device is in charge mode (2.5V
< V
BATT
< BATT Regulation Voltage).
CURRENT
LOOP
CURRENT-
SENSE
CIRCUIT
MAX
DETECTOR
CIRCUIT
VOLTAGE
SELECTOR
CURRENT
SELECTOR
REGULATOR
VOLTAGE
LOOP
THERMAL
LOOP
OVERCURRENT
DETECTOR
BATT
4.7V
BATTERY
OVERVOLTAGE
DETECTOR
IN
SELI
3V
BIAS
2V
EN
GND
SELV
MAX1811
CHG
(2.5V, 4.2V)
Figure 1. Functional Diagram
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