The TPS5124 is dual independent high efficiency synchronous step-down controller. It supports a low-voltage/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 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.

• 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