Version: 10/5/2022 www.lowpowersemi.com email: marketing@lowpowersemi.com 1 / 26
LP4081
16V, I2C Controlled Linear Charger with Power Path
Features
âš« Input over-voltage protected up to 16V
âš« Charge Management
- Programmable charge current up to 1A
- Programmable floating voltage with 0.3%
accuracy
- Programmable trickle charge and termination
current
âš« Charge and discharge current monitor
âš« Automatic re-charge and thermal foldback
âš« I2C bus to SoC with an interrupt pin
âš« Low drop-out fast charge function and low heat
âš« Power path management
âš« Charge safety timer and watchdog
âš« High accuracy current mirror for gauge application
âš« Rich protections: UVLO, OVP, SCP
⚫ 0.6-µA ultra-low iq in standby mode
⚫ 0.4-µA ultra-low iq in ship mode
⚫ 2mm Χ 2mm QFN-12 package
âš« RoHS Compliant and 100% Lead (Pb) Free
âš«
Applications
âš« Wearable
âš« Fitness Application
âš« Smart Watch
General Description
The LP4081 is an ultra-low power linear charger targeting
at wearable applications protected up to 16V input voltage.
It contains a linear charger to charge the Li-ion battery. The
charger has an ideal-diode mode for high efficiency and
low heat operation. The LP4081 integrates the power path
management function to support SoC powerup even with
a deeply-discharged battery. The LP4081 features 150mΩ
low R
ds,on
of the BAT_FET from the battery to the system
to achieve high discharge efficiency and low heat under full
load range. An I2C interface is offered for programmability
and flexibility of the device.
The LP4081 provides rich protections, including the input
Under-volage lockout protection (UVLO), input over-
voltage protection (OVP) and system short circuit
protection (SCP).
The typical quiescent current of LP4081 is 0.6-µA and the
battery current is reduced to 0.4-uA in ship mode.
The whole system is in a 12-pin 2 X 2 QFN package.
Order Information
LP4081
F: Green/Pb-Free
Package Type
QV : QFN
Typical Application Circuit
LP4081
BAT
BUS
SYS
SoC
SCL
IRQb
GPIO0
GPIO1
SDA
GPIO2
Q1 Q2
Q3
Battery
VIN
ICHG
GND
2kΩ
R
1
10uF
C
2
10uF
C
1
COM
RESET
VIO
PWRON
PWRKEY
RST
TXRX
1V8
VDDIO
PWRON
RESET
COM
PWRON
RESET
VDDIO
COM
11
3
10
2
9
5
8
4
6
7
1
12
