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1 General description

The PCA9485 is a highly integrated switched-capacitor converter with an embedded OVPFET and dual external

FET controls, targeted to provide the quadruple output current for the fast charging applications with a 1-cell

battery. The device works in 4:1 switching operation with an extremely high efficiency (around 96.8 %, at VOUT =

4.5 V, IOUT = 8 A), in 1:4, 2:1 and 1:2 switching operation or in 1:1 mode with forward and reverse direction.

Absolute maximum voltage for each VUSB, VWPC, VIN, VOUT, and VUSB/VWPC input is designed to support

up to 35 V. VIN input supports up to 27 V with the pre-bias enabled for USB VBUS/wireless receiver output.

VOUT input is designed to support up to 7 V with the pre-bias enabled for a 1-cell battery application.

The device provides multiple safety schemes such as OC (overcurrent), RC (Reverse-Current), OV

(overvoltage), UV (Under-Voltage), switching pin short, thermal shutdown, and others.

The PCA9485 also has leader-follower function built in that allows two PCA9485 devices to be used seamlessly

in handheld applications.

The device features all the functions with an I2C interface, with up to 1 MHz speed.

2 Features

? Dual-phase switched-capacitor to optimize efficiency

? Integrated 4:1, 2:1 switched capacitor charger for single cell battery including 1:1 bypass

? Reverse operation mode, such as 1:4, 1:2 and reverse bypass from VOUT to VIN

? 96.8 % efficiency at VOUT = 4.5 V and IVOUT = 8 A

? Wide range of input voltage

– From 6 V to 10.5 V in 2:1 switching operation mode

– From 12 V to 21 V in 4:1 switching operation mode

? An OVPFET with IVIN and VBAT regulation loop

? External FET gate control for GaN and CMOS

– Support dual input via USB and wireless power receiver

? Multiple Safety Schemes

– Over/undervoltage protection

– Overcurrent protection (OCP)

– Fast OCP for short protection during operation (Fast OCP)

– Overtemperature protection (OTP)

– Input/output or flying capacitor short detection in startup

– Reverse current protection (RCP)

– Watchdog timers

? Leader and follower function for parallel charging

? 1 Mbit/s I2C-bus target interface

? 4.06 x 4.46 mm, 10 x 11, 110 WLCSP with 0.4 mm pitch

3 Applications

Smart phone, tablet, and other portable electronic devices with large capacity battery.