LP28056 Datasheet, PDF (2/9 Pages) Lowpower Semiconductor inc – Programmable Charge Current Up to 1200mA

Preliminary Datasheet
LP28056
Functional Pin Description
Package Type
Pin Configurations
SOP-8(P)
NC
1
ISET 2
VSS
3
LP28056
9
PGND
8
NC
7
STAT1
6
STAT2
VIN
4
5
BATT
Pin Description
PIN
PIN
Number
1,8
NC No Connector.
DESCRIPTION
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed
by connecting a 1% resistor(R_PROG)to ground. When charging in constant-current mode, this pin servos to
2
Iset
1V. In all modes, the voltage on this pin can be used to measure the charge current using the following
formula.
3
VSS VSS is the connection to system ground.
4
Vin VIN is the input power source. Connect to a wall adapter.
5
BATT
BAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for stability when
there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required.
6
STAT2
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled High by an
internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled Low.
7
STAT1
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by an
internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled High.
LP28056 – 01 Ver. 1.1 Datasheet
FEB.-2012
www.lowpowersemi.com
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