MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE
MP26058 Rev. 0.91 www.MonolithicPower.com 4
1/25/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1 IN Input Supply Pin. IN receives the AC adapter or USB supply voltage.
3
CHG
Open-Drain Charge Indicator. This pin is low during charging, is High after battery full or
termination, is toggling the battery is fault.
2
ACOK
Open-Drain Fault Status Indicator.
4 TMR
Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the
oscillator period. T(sec)=22000 * C
TMR
(µF). Short this pin to ground to disable timer.
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 if the pin is floating will enable the IC.
8 ISET
Constant Charge Current Program pin. Connect this pin to an external resistor to program the
charging current in CC Mode.
7 IBF
Charge Status Threshold Program. Connect this pin to an external resistor to program the
charge termination current or battery full indication threshold.
9 NTC
Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor from this
pin to the IN 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.
