Version: 23/10/2022 www.lowpowersemi.com email: marketing@lowpowersemi.com 1 / 28

LP4081

TWS Linear Charger with Power Path Management

Features

⚫ Input over-voltage protected up to 16V

⚫ Charge Management

- Programmable charge current up to 1A

- Programmable floating voltage with 0.3% accuracy

- 75mV low dropout charging and how heat

- Programmable trickle charge and termination current

with minimum 1mA termination current

⚫ Automatic re-charge and thermal foldback

⚫ I2C bus to SoC with an interrupt pin

⚫ Low drop-out fast charge function and low heat

⚫ Power path management

⚫ RESET output when inserted into the charging case

⚫ PWRON output when removed from the charging case

⚫ Support private one-wire instructions

⚫ Charge safety timer and watchdog

⚫ High-accuracy current mirror output for gauge-related

application

⚫ Rich protections: UVLO, OVP, SCP

⚫ Minimum 0.6-µA iq in normal operation

⚫ 0.4-µA ultra-low iq in ship mode

⚫ 2mm Χ 2mm QFN-12 package

⚫ RoHS Compliant and 100% Lead (Pb) Free

Applications

⚫ TWS

⚫ Wireless Microphone

⚫ Smart Glasses

⚫ Fitness Application

⚫ Smart Watch

⚫ Remote Control

General Description

The LP4081 is a fully integrated linear charger solution

with power path management targeting True Wireless

Stereo (TWS) applications which needs small solution

size, low quiescent current and bi-directional

communication. A low on-resistance BUS-FET is

integrated to manage the input power from a BUS pin. A

bidirectional BAT-FET is integrated to manage charging

and discharging of the battery. A SYS pin delivers power

to the system that contains an SoC typically. The charger

has an ideal-diode mode for high efficiency and low heat

operation. The minimum voltage drop across the BUS pin

and BAT pin is only 75mV when charging. The LP4081

offers power path management that allows the system to

be powered up with a fully-discharged battery. It can

dynamically mange the power from the BUS input and the

battery to meet the system loading needs. An I2C

interface enables programming various parameters of

charging, discharging and multiple protection functions.

An interrupt output (IRQb) sends a signal to the SOC

when an interrupt event happens, so the SoC can take

actions accordingly.

Multiple features are offered for the safe operation of the

system, including input voltage OVP (over voltage

protection), UVLO (under voltage lockout), OTP (over

temperature protection), SCP (short circuit protection),

system reset, watchdog timer, etc. When powered by a

battery, LP4081 can be further reduced to 0.4-μA when

entering ship mode.

The whole system is in a 12-pin 2 X 2 QFN package.

Order Information

Typical Application Circuit