TPS5124

TPS5124 ą DUAL CHANNEL, SYNCHRONOUS STEPĆDOWN PWM CONTROLLER SLUS571 − SEPTEMBER 2003 FEATURES D High Efficiency − No Current Sense Resistor Required, RDS(on) Overcurrent Detection with Temperature Compensation D Adjustable Output Voltage Down to 0.9 V D Voltage-Mode PWM Control: Maximum 500-kHz Operation D 180° Out-of-Phase Control D Individual Standby and Soft-Start for Each Channel − Easy Power Sequencing D Overvoltage and Undervoltage Protection D Built-In Boot-Strap Diode D Built-In 5-V Linear Regulator D Accurate ± 1% 0.85-V Reference APPLICATIONS D Consumer Game Systems D DSP Applications D Digital Set-Top Box D 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,...