MAX1811(2003) Просмотр технического описания (PDF) - Maxim Integrated
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MAX1811 Datasheet PDF : 8 Pages
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USB-Powered Li+ Charger
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.
Battery Regulation Current-Select Input. A low (< 0.8V) selects a 100mA maximum battery regulation
2
SELI
current. A high (> 2.0V) selects a 500mA maximum battery regulation current. SELI is not diode clamped
to IN, and the voltage at VSELI can exceed the voltage at VIN.
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
< VBATT < BATT Regulation Voltage).
SELI
IN
3V
EN
BIAS
2V
THERMAL
LOOP
OVERCURRENT
DETECTOR
VOLTAGE
LOOP
CURRENT
SELECTOR
VOLTAGE
SELECTOR
MAX
DETECTOR
CIRCUIT
REGULATOR
BATT
CHG
(2.5V, 4.2V) 4.7V
BATTERY
OVERVOLTAGE
DETECTOR
MAX1811
CURRENT
LOOP
CURRENT-
SENSE
CIRCUIT
Figure 1. Functional Diagram
SELV
GND
_______________________________________________________________________________________ 5
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