MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
MP2605 Rev. 1.0 www.MonolithicPower.com 5
1/19/2017 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1 VIN Input Supply Pin. VIN receives the AC adapter or USB supply voltage.
2
ACOK
Open-Drain Fault Status Indicator. This pin is high under any fault conditions.
3
CHG
Open-Drain Charge Indicator. This pin is low during charging, is high after battery full
or termination, and is toggling when the battery is in fault condition.
4 TMR
Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set
the oscillator period.
5
GND, Exposed
Pad
The exposed pad and GND pin must be connected to the same ground plane.
6 SHDN Charger IC Enable. An input “Low” signal at this pin or pin floating will enable the IC.
7 SS
Soft-Start. Connect a capacitor to ground to set the soft-start time. The rising time
constant is
SS
3
C10400
, where C
SS
is in μF.
8 ISET
Constant Charge Current Program Pin. Connect this pin to an external resistor to
program the charging current in CC Mode.
9 NTC
Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor
from this pin to the VIN pin and a 100kΩ NTC resistor (within the battery pack) from
this pin to ground. If NTC function is not used, replace NTC resistor with a regular
100kΩ resistor from this pin to ground. Do not leave this pin floating.
10 BATT Charger Output.
