Version: 5/5/2023 www.lowpowersemi.com email: marketing@lowpowersemi.com 1 / 25
LP4081B
19V Linear Charger with Power Path Management
Features
âš« Input over-voltage protected up to 19V
âš« Charge management
- Programmable charge current up to 1A
- Programmable floating voltage with 0.3% accuracy
- Programmable trickle charge and termination current
with minimum 1mA termination current
âš« Automatic re-charge and thermal foldback
âš« I2C bus to SoC with an interrupt pin
âš« Power path management
âš« Charge safety timer and watchdog
âš« NTC management
âš« Rich protections: UVLO, OVP, SCP
⚫ Minimum 0.6-µA ultra-low iq in normal operation
⚫ 0.4-µA ultra-low iq in ship mode
⚫ 2mm Χ 2mm QFN-12 package
âš« RoHS Compliant and 100% Lead (Pb) Free
Applications
âš« Smart Watch
âš« Fitness Application
âš« TWS
âš« Remote Control
âš« Solar Charger
General Description
The LP4081B is a fully integrated linear charger solution
with power path management targeting single-cell Li-ion
battery powered wearable applications. 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. An NTC circuit is offered to manage the
temperature range that charging is allowed. A SYS pin
delivers power to the system that contains an SoC
typically. The LP4081B offers power path management
that allows the system to be powered up with a fully-
discharged battery. It can dynamically manage 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 offerd 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, LP4081B can operate with only 0.6-µA current
and this current 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
LP4081B
F:Green/Pb-Free
Package Type:
QV:QFN
11
12
2
7
4
V
IN
C
1
C
3
10μF
BUS
SYS
SCL
VDD
SDA
IRQb
BAT
LP4081B
R
2
V
SYS
V
SYS
6
1
C
4
10μF
V
BAT
NTC
10
GND
9
R
NTC
C
2
1μF
R
1
1Ω
1μF
5
VIO
VDDIO
VDD
SoC
C
5
0.1μF
LP4081B
Version: 5/5/2023 www.lowpowersemi.com email: marketing@lowpowersemi.com 2 / 25
Device Information
Part Number
Top Marking
Package
MSL
LP4081BQVF
LPS
LP4081B
YWX
12-pin 2 X 2 QFN
LEVEL 3
Marking indication: Y: Year code. W: Week code. X: Batch numbers.
MSL: Moisture Sensitivity Level according to JEDEC Standard.