FEATURES

High Efficiency − No Current Sense Resistor

Required, RDS(on) Overcurrent Detection with

Temperature Compensation

Adjustable Output Voltage Down to 0.9 V

Voltage-Mode PWM Control: Maximum

500-kHz Operation

180° Out-of-Phase Control

Individual Standby and Soft-Start for Each

Channel − Easy Power Sequencing

Overvoltage and Undervoltage Protection

Built-In Boot-Strap Diode

Built-In 5-V Linear Regulator

Accurate ± 1% 0.85-V Reference

APPLICATIONS

Consumer Game Systems

DSP Applications

Digital Set-Top Box

VGA and Sound Cards

DESCRIPTION

The TPS5124 is dual independent high efficiency

synchronous step-down controller. It supports a

low-voltage/high-current power supply applica−

tions that use either a 5-V or 12-V bus voltage.

Since both controllers of the TPS5124 operate

180 degree out-of-phase, the input current ripple

is minimized resulting in a smaller input

capacitance and reduced power supply cost.

The current protection circuit detects the

drain-to-source voltage drop across the high-side

and low-side power MOSFET while it is

conducting. Also, the current protection circuit has

a temperature coefficient to compensate for the

RDS(on) variation of the MOSFET. This

resistor-less current protection and built-in boost

diode simplify the system design and reduces the

external parts count. Other features such as

undervoltage lockout, overvoltage, undervoltage,

and programmable short-circuit protection

promote system reliability.