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LP7811

更新时间： 2024-12-01 17:00:55
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微源半导体 - LOWPOWER /
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27页 1952K
描述
HERO Charge,路径管理,I2C控制；支持MCU双向通讯，耳机电压跟随充电提升耳机仓续航时间

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LP7811 数据手册

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LP7811  
30V, BUCK Mode TWS Charging Case Manager  
Features  
General Description  
⚫ Case Charging Management  
The LP7811 is an advanced TWS charging case  
- Support 4.1V to 6.0 V input voltage with 30V absolute  
maximum input voltage rating  
management IC targeting to improve the total battery run  
time of the TWS earphones. The IC features a switching  
charger protects up to 30V input voltage and digitally  
programmable up to 1.7-A charge current via an I2C bus.  
The smart discharge voltage management feature tries to  
maximize the battery run time with ultra-low dropout  
charging scheme. The VOL and the VOR outputs track the  
battery voltages of the earphones when operating together  
with the companion linear charger (LP408X) in the  
earphone, minimizing the power loss. An NTC interface is  
offered to manage the charge and discharge operation  
based on the battery temperature sensed by the NTC  
resistor. Additional silicon temperature management  
ensure the safe operation. Earphone insertion and removal  
detections simplify the design of the earphone detection.  
The IC supports two independent bidirectional  
communication bus to the left and right earphone. An I2C  
bus is offered for programmability and flexibility of the  
device.  
- Programmable fast charge current up to 1.7A with up  
to 95% efficiency and 5% accuracy  
- Programmable floating voltage with 0.5% accuracy  
- Automatic recharge function  
- Programmable trickle charge current  
- Programmable termination current  
⚫ Smart Earphone Charging Management  
- Independent earphone insert detection and charging  
path  
- Smart earphone ultra-low dropout charging to  
maximize battery run time  
- Programmable earphone fast charge current up to  
300mA each channel  
- Programmable End of Charge (EEOC) current  
- Bi-directional communication to earphones  
⚫ Programmable Always-on Linear Regulator  
⚫ Temperature Management  
The quiescent current is 5-uA in standby mode.  
The whole system is in a small 24-pin 4x4 QFN package.  
- JEITA standard NTC management during charging  
Order Information  
and discharging  
LP7811  
- Charging current thermal foldback  
- Thermal shutdown protection  
F: Green/Pb-Free  
⚫ I2C interface with interrupt indication  
⚫ 5-uA ultra-low quiescent current  
⚫ 4mm X 4mm QFN-24 package  
Package Type  
QV : QFN  
⚫ RoHS Compliant and 100% Lead (Pb) free  
Typical Application Circuit  
Applications  
⚫ TWS charging case  
⚫ Wireless microphone  
⚫ Smart Glasses  
Battery  
10uF  
C3  
2.2uH  
L1  
10uF, C4  
Earphone  
Pogo Pin  
19  
BAT  
VIN  
21/22  
SW  
23/24  
PMID  
Input  
1/2/3  
13  
VOL  
1Ω, R1  
1uF, C2  
2.2uF,C1  
12  
VOR  
6
VCC  
0.47uF  
C5  
2P7  
VCC  
VCC  
LP7811  
9
8
SDA  
SCL  
IRQb  
15  
LED2  
LED1  
GPIO0  
GPIO1  
HALL  
GPIO8  
16  
7
5
GPIO2  
GPIO3  
GPIO4  
NTCS  
100kΩ,  
R3  
ß=3435  
KEY  
VCC  
11  
4
COMML  
COMMR  
NTC  
GND  
GPIO7  
14/17/18  
100kΩ  
10  
RNTC  
Version: 4/5/2023  
www.lowpowersemi.com  
email: marketing@lowpowersemi.com  
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