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.