September 2016

DocID029626 Rev 2

1/18

For further information contact your local STMicroelectronics sales

office

www.st.com

STWLC04

Qi based, 1 W optimized wireless power receiver

Data brief

Features



1 W output power



Qi 1.1 wireless standard communication

protocol based



Integrated high efficiency synchronous

rectifier



800 kHz programmable step-down converter

with input current and input voltage

regulation loop



Step-down converter efficiency up to 90%



Simplified Li-Ion/Polymer charger function



32-bit, 16 MHz embedded microcontroller

with 16 kB ROM and 2 kB RAM memory



2 kB NVM for customization



Integrated driver for external supply switch



Precise voltage and current measurements

for received power calculation





Configurable GPIO output



Rx coil NTC protection



Thermal protection



Low power dissipative rectifier overvoltage

clamp



Flip Chip 77 bumps (3.12x4.73 mm)

Applications



Wearable applications



Smart watches



Glasses



Medical and healthcare instrumentation

Description

The STWLC04 is an integrated wireless power

receiver suitable for wearable applications. The

device is designed for 1-watt power transfer

based on the Qi protocol, with digital control and

precise analog control loops ensuring stable

of customization and settings can be stored in the

embedded non-volatile memory.

The STWLC04 can deliver the output power in

two modes: as a power supply with configured

output voltage or as a simple CC/CV battery

charger with configurable charging current,

charging voltage and termination current. The

STWLC04 can detect the external (wired) power

supply connection and drive an external power

switch.

Table 1: Device summary

Order code

Description

Package

Packing

STWLC04JR

Wearable optimized 1 W output

Flip Chip 77 bumps (3.12x4.73 mm)

Tape and reel