Version: 10/5/2022 www.lowpowersemi.com email: marketing@lowpowersemi.com 1 / 17
LP4080H
Ultra-high Efficiency Linear Charger for TWS Earphones
Features
âš« Input over-voltage protected up to 8-V
⚫ 0.6-µA standby current from the battery
âš« Programmable charge current up to 300mA
âš« Ideal diode mode for high efficiency and low heat
âš« 7.5-mA fixed trickle charge
âš« 9-mA fixed termination current
âš« Programmable 4.0-V/4.2-V/4.35-V/4.4-V constant
voltage options
âš« Automatic battery recharge control
âš« CHGb output for charging status indication
âš« ENb control to disable the charger
âš« RESET signal to prevent the bluetooth system on chip
(SoC) firmware failure
âš« PWRON signal to automatically power on the earphone
SoC once leaving the charging case
âš« Private one-wire bus to send instructions from the
charging case to the linear charger for control
âš« Programmable general purpose output signal
âš« I2C interface with interrupt indication
âš« 4-uA ultra-low quiescent current
âš« 2mm X 2mm DFN-8 package
âš« RoHS Compliant and 100% Lead (Pb) free
Applications
âš« TWS earphones
âš« Wireless microphone
âš« Smart Glasses
General Description
The LP4080H is an ultra-low power linear charger targeting
at TWS earphone applications. It contains a linear charger
to charge the Li-ion battery in the earphone with a CHGb
charging status indication and an ENb input to disable the
charger when needed. The constant charge current (CC)
of the charger is programmable via the ISET pin by an
external resistor. The charger has an ideal-diode mode for
high efficiency and low heat operation. Two logic signals
are offered to work with the Bluetooth SoC. The RESET
outputs a reset signal to the SoC every time the earphone
is placed into the charging case. The PWRON outputs a
pulse signal to turn on the earphone SoC every time the
earphone leaves the charging case. The GPO pin is a
multifunctional output pin for system design. All these
signals can also be controlled via a one-wire
communication.
The whole system is in a small 8-pin 2x2 DFN package.
Order Information
Typical Application Circuit
LP4080H
F: Green/Pb-Free
Package Type
QV : DFN/QFN
LP4080H
BAT
VIN
CHGb
C
1
ISET
GND
RESET
PWRON
ENb
GPO
BAT
RESET
PWRKEY
GPIO
GPIO
BT
MCU
R
1
1
2
3
4
5
6
7
8
C
2
