USB Type-C,DCP charge port converter with cable compensation and thermal foldback

The TPS2583x-Q1 is a USB Type-C and BC1.2 charging

port controller that includes a synchronous DC/DC converter. With cable droop

compensation, the VBUS voltage remains constant regardless of load

current, ensuring connected portable devices charge at optimal current and

voltage.

The TPS25832-Q1 includes high bandwidth analog switches for DP and DM pass-through, while the TPS25833-Q1 includes a thermistor input pin and thermal warning flag for user programmable thermal overload protection.

The synchronous buck

regulator operates with current mode control and is internally

compensated to simplify the design. A resistor on the RT pin sets

the switching frequency between 300 kHz and 2.2 MHz. Operating below

400 kHz results in better system efficiency. Operation above 2.1 MHz

avoids the AM radio bands and allows for use of a smaller

inductor.

The TPS2583x-Q1 integrates

standard USB Type-C port controller functionality including

Configuration Channel (CC) logic for 3-A and 1.5-A current

advertisement. Battery Charging (Rev. 1.2) integration provides the

required electrical signatures necessary for non-Type-C, legacy USB

devices that use USB data line signaling to determine USB port

current sourcing capabilities.

A precision current sense

amplifier is included for user programmable cable droop compensation

and current limit tuning. 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 VBUS voltage measured at a

connected portable device remains approximately constant, regardless

of load current, allowing the portable device’s battery charger to

work optimally.

The USB specifications

require current limiting of USB charging ports, but give system

designers reasonable flexibility to choose overcurrent protection

levels based on system requirements. The TPS2583x-Q1 uses a novel

two-threshold current limit circuit allowing system designers to

either program average current limit protection of the buck

regulator, or optionally, current limit using an external NMOS

between the CSN/OUT and BUS pins. The NFET implementation enables

the TPS2583x-Q1 buck regulator to supply a 5-V output for other

loads during an overcurrent fault condition on the USB port.

The TPS25832-Q1 includes

high bandwidth analog switches for DP and DM pass-through. The

TPS25833-Q1 includes a thermistor input pin and thermal warning flag

for user programmable thermal overload protection.

Integrated protection

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

protection, undervoltage lockout, VBUS overvoltage and

overcurrent, CC overvoltage and overcurrent, data line

(Dx) short-to-VBUS and die

overtemperature protection.