Preliminary Datasheet

LP78090

LP78090 – 00

Version 1.0

Feb.-2014

www.lowpowersemi.com

Page 1 of 10

Smart Charger With Power Path

General Description

The LP78090 is a monolithic linear battery charger

whit smart power path switch for single-cell Li-ion

batteries in a wide range of tablet and other portable

devices. It integrates a linear regulated voltage for

power the system and charging the battery at the

same time. This device supports both USB and high

power DC adapter input. Its charger is a complete

constant-current constant voltage linear charger with

adjustable charge current up to 1000mA. No external

sense resistor is needed, and no blocking diode is

required due to the internal MOSFET architecture.

Thermal feedback regulates the charge current to limit

the die temperature during high power operation or

high ambient temperature. The charge voltage is fixed

at 4.2V, and the charge current can be ISET rammed

externally

with

a

single

resistor.

The

charger

automatically terminates the charge cycle when the

charge current drops to 1/10th the ISET rammed value

after the final float voltage is reached. When the input

supply (wall adapter or USB supply) is removed, the

LP78090 automatically enters a low current state,

dropping the battery drain current to less than 15µA.

When connecting a high power DC adapter, the smart

power path management allows LP78090 power the

system with VIN voltage or BAT voltage by switching

the voltage level on SC pin and charge the battery

simultaneously.

This

allows

immediate

system

operation

even

under

moving

away

or

deeply

discharged battery. When the input current limit is

reached, the voltage applied on the SYS pin would pull

down to the battery voltage making the charge current

decrease. If the current out of SYS pin is more than

charge current plus 1200mA, LP78090 with turn power

adapter and battery support the system load together.

The LP78090 provides an internal path from battery to

system in the event the input is removed.

Other features include charge current monitor, under

voltage lockout, automatic recharge and a status pin to

indicate charge termination and the presence of an

input voltage.

Order Information

LP78090

□ □ □

F: Pb-Free

Features



Programmable Charge Current Up to 1000mA



Smart Power Path Management



No MOSFET, Sense Resistor or Blocking Diode

Required



Constant-Current/Constant-Voltage Operation

with Thermal Regulation to Maximize Charge

Rate Without Risk of Overheating



Charges Single Cell Li-Ion Batteries Directly from

USB Port



15µA Leakage Current in Shutdown



Charging Operation and Charge Complete

Indicator



Thermal Limiting Regulation on Chip



Internal Soft Start Function



Built-in Short-Circuit Protection



Consumption Available in TDFN-10 Package



RoHS Compliant and 100% Lead (Pb)-Free

Marking Information

Applications



MID/Pad



Automobile Data Recorder or Event Data

Recorder



Power Bank



Smart

Phone



Bluetooth Applications

Device

Marking

Package

Shipping

LP78090QVF

QV:TDFN10

3K/REEL

Package Type

QV:TDFN-10