Dual 3-A USB Type-C® charging ports controller with programmable current limit and load shedding

The TPS2585x-Q1 is an integrated USB charging port

solution, which includes a synchronous DC/DC converter capable of supplying up to

6.6 A and integrated detection and control for implementing USB Battery Charging 1.2

and Type-C ports.

The TPS2585x-Q1 is a family of highly-integrated USB Type-C charging controller for dual-USB ports

application.

The TPS2585x-Q1 integrates a monolithic,

synchronous, rectified, step-down, switch-mode

converter with internal power MOSFETs and two USB

current-limit switches with charging port

auto-detection. The TPS2585x-Q1 offers a compact

solution that achieves 6.6 A of continuous output

current with excellent load and line regulation

over a wide input supply range. The synchronous

buck regulator operates with peak-current mode

control and is internally compensated to simplify

the design. A resistor on the FREQ pin sets the

switching frequency between 200 kHz and 800

kHz.

The TPS2585x-Q1 integrates standard USB Type-C port controller functionality including

Configuration Channel (CC) logic for 3-A and 1.5-A current advertisement. TPS25858-Q1

integrates Battery Charging (Rev. 1.2) to provide the required electrical signatures

necessary for non-Type-C, legacy USB devices which use USB data line signaling to determine

USB port current sourcing capabilities. TPS25859-Q1 can enable each port individually and

can report fault condition for each port. The TPS2585x-Q1 also offers VCONN power that can

meet the USB3.1 power requirement. The part is especially suitable for dual-port application

due to the high system integration and small footprint.

The TPS2585x-Q1 supports intelligent thermal management. The USB output voltage and Type-C

current advertisements can be regulated according to the temperature sensing through the TS

pin. The TPS2585x-Q1 must connect a NTC thermistor on the TS pin to monitor the ambient

temperature or PCB boar temperature, depending on where the NTC thermistor is put in the USB

charging module or PCB board. Select a different NTC thermistor and bottom-side series

resistor can change the temperature threshold for load shedding.

The TPS2585x-Q1 have four selectable USB output

voltage settings: 5.1 V, 5.17 V, 5.3 V, and 5.4 V.

The TPS2585x-Q1 integrates a precision current

sense amplifier for cable droop compensation and

user-programmable current limit tuning. The cable

compensation is only available when the output

voltage is set to 5.17 V. The cable compensation

voltage is 90 mV at 2.4-A output current. Cable

compensation aids portable devices in charging at

optimum current and voltage under heavy loads by

changing the buck regulator output voltage

linearly with load current to counteract the

voltage drop due to wire resistance in automotive

cabling. The BUS voltage measured at a connected

portable device remains approximately constant,

regardless of load current, allowing the battery

charger of the portable device to work

optimally.

The TPS2585x-Q1 provides various safety features

for USB charging and system operations, including

external negative thermistor monitoring,

cycle-by-cycle current limit, hiccup short-circuit

protection, undervoltage lockout, BUS overcurrent,

OUT overcurrent, and die overtemperature

protection.

The device family is available in a 25-pin, 3.5 mm × 4.5 mm QFN package.