LP78073A-01

Jun.-2015

www.lowpowersemi.com

Page 2 of 10

Preliminary Datasheet

LP78073A

Functional Pin Description

Package Type

Pin Configurations

ESOP-8

FB

BAT

VOUT

EN

ISET

CHRG_B

LX

VIN

1

2

3

4

5

6

7

8

9

GND

Pin Description

PIN

NAME

DESCRIPTION

1

FB

Boost Feedback pin. The pin voltage is 0.8V.

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

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

ISET

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

connecting a 1% resistor(R

modes, the voltage on this pin can be used to measure the charge current using the following formula.LP78073A:

5

Vin

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

6

BAT

BAT is the connection to the battery. A 10µF capacitor is needed at least.

7

VOUT

Output voltage pin.

8

EN

Boost enable pin. Active High.

9

GND

Ground Pin.

Application Circuit

BAT

CHRG_B

VOUT

VIN

GND

ISET

Rset

Cin

10uF

Cbat

10uF

LP78073A

LX

EN

2.2uH

FB

Cout

10uF

R1

68K

R2

13K

Vout

Battery

VIN

1K

LED

ON

OFF

10Ω

2.2nF