ETA9185

www.etasolution.com

1

Empower Thinkers

Ultra Low Power 5V Boost Converter, 20V Linear Charger and Fuel

Gauge All-in-One Solution for TWS Charge Cradle

DESCRIPTION

FEATURES

ETA9185 is an all-in-one solution for TWS charge

cradle. It includes a 20V single cell Li+ battery linear

charger, a 5V Boost synchronous converter with

true-shutoff function and a Fuel Gauge with LED

indication. The linear charger is fully integrated with

constant current (CC) / constant voltage (CV) control

module and a charge FET. It has a pre-charge

function for trickle charging a deeply discharged

battery and its fast charge current can be

programmed by an external resistor. In CV charge

stage, charging will be terminated when the charge

current drops to 1/10 of the programmed value. The

integrated low power 5V Boost converter is capable

of delivering 1.0A current at 5V output. It can be shut

down by pulling the ENBST pin low. The true shut

down feature disconnect output from the BAT

thereby further decreasing the system standby

power. Its 1.0MHz switching frequency allows a very

small external inductor with inductance as low as

2.2uH. A fuel gauge also drives 4 LEDs for battery

level indication. ETA9185 is ideal for applications

such as a TWS charging cradle that requires low

standby power and small PCB space.

ETA9185 is housed in a ESSOP10/DFN3x3-10

package



Ultra low boost standby Iq , Ibat<10uA



20V Charge input standoff voltage



4.2V/4.35V charge termination voltage



Charge current programmable



Boost Output Disconnect and SCP



5V/1.0A Output Power



Up to 96% Efficiency for boost



Fuel Gauge and LED indicators



NTC thermistor input



Logic Control Shutdown



Thermal shutdown



ESSOP10/ DFN3x3-10 Package

APPLICATIONS



TWS BT earbuds charge case



Bluetooth application



Battery powered IOT module



Power Bank

TYPICAL APPLICATION

VOUT

ISET

VIN

LED1

BAT

NTC

LED3

SW

ENBST

LED2

GND

VIN

10uF

RNTC

2.2uH

D1

D2

D3

D4

22uF

RISET

ENBST

VOUT

ETA9185

R1