TPS5124

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

      The TPS5124 is dual independent high efficiency synchronous step-down controller. It supports a lowvoltage/high-current power supply applications 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 of TPS5124 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
R_DS(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 of TPS5124 such as undervoltage lockout, overvoltage, undervoltage, and programmable short-circuit protection promote system reliability.