1 Features

• Programmable power supply (PPS) support for

USB power delivery (USB PD)

– Wide input voltage range: 2.4V to 22V

– 3.0V Minimum input voltage for start-up

– Programmable output voltage range: 0.8V to

22V with 10mV step

– ±1% reference voltage accuracy

– Adjustable output voltage compensation for

voltage drop over the cable

– Programmable output current limit up to 6.35A

with 50mA step

• High efficiency over entire load range

– 92.0% efficiency at VIN = 20V, VOUT = 5V and

IOUT = 5A

– 96.0% efficiency at VIN = 12V, VOUT = 20V and

IOUT = 3A

• I2C Programming

– Output enable(OE) On/Off

– Slew rate of output voltage change

– Switching frequency: 400kHz, 800kHz, 1.6MHz,

2.2MHz

– Programmable PFM and FPWM mode at light

load

– Spread spectrum enable/disable

– Output discharge enable/disable

• Rich protection features

– Input overvoltage protection

– Output absolute overvoltage protection

– Output relative overvoltage protection

– Hiccup mode for output short-circuit protection

– Thermal shutdown protection

– 8A average inductor current limit

• Small solution size

– Four low RDS(ON) internal MOSFETs

– Maximum switching frequency up to 2.2MHz

– 2.5mm × 3.5mm HotRod™ WQFN package

2 Applications

• USB PD

• Wireless charger

• Docking Station

• Notebook computer

• SSD

3 Description

The TPS55285 is a fully integrated synchronous

buck-boost converter that is optimized for converting

battery voltage, USB Power Delivery (USB PD)

or adaptor voltage into power supply rails. The

TPS55285 integrates four 15mΩ MOSFETs to provide

a high efficiency and small size solution.

The TPS55285 has a wide input voltage range from

2.4V (3.0V rising) to 22V and is capable of outputting

0.8V to 22V voltage with 10mV step to support a

variety of applications. It features 8A average inductor

current limit and can supply up to 7A output current

in buck mode. When working in boost mode, it can

deliver 60W from 12V input or 30W from 5V input.

Through the I2C interface, the output voltage of the

TPS55285 can be programmed dynamically. The

default output voltage is 5V when the device is

enabled. The I2C interface allows for configuration

of slew rate of the output voltage change, switching

frequency, forced PWM mode operation.

The TPS55285 offers input and output over-voltage

protection, average inductor current limit, cycle-bycycle

peak current limit and output short circuit

protection. The TPS55285 also ensures safe

operating with output current limit without external

output current sense resistor and hiccup mode

protection in sustained overload conditions.

The TPS55285 allows the use of small inductor and

capacitor with high switching frequency. It is available

in 2.5mm × 3.5mm QFN package.