Preliminary Datasheet

LP78071

LP78071 – 00 Version 1.0 Feb.-2014

Pin Description

TDFN-10

ESOP8

PIN

DESCRIPTION

1

1

FB

Boost Feedback pin. The pin voltage is 0.8V.

2

2

LX

Boost Output switching node. SW is the drain of the internal low-side N-Channel MOSFET

and high-side P-Channel MOSFET. Connect the inductor to SW to Complete the step-up

converter.

3

3

CHRG_B

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.

4

CE

Charge enable pin.

5

4

ISET

Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is

programmed by connecting a 1% resistor(R

mode, this pin servos to 2V. In all modes, the voltage on this pin can be used to measure the

charge current using the following formula.LP78071: Iset=1000/Rprog.

6,11

9

GND

Ground Pin.

7

5

Vin

VIN is the input power source. Connect to a wall adapter.

8

6

BAT

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.

9

7

VOUT

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.

10

8

EN

Boost enable pin. Active High.