TPS51124

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS51124 SLVS616C – NOVEMBER 2005 – REVISED DECEMBER 2014 TPS51124 Dual Synchronous Step-Down Controller for Low-Voltage Power Rails 1 Features 1 High Efficiency, Low-Power Consumption, Shutdowns to <1 μA Fixed Frequency Emulated On-Time Control, Frequency Selectable From Three Options D-CAP™ Mode Enables Fast Transient Response Auto-Skip Mode Less Than 1% Initial Reference Accuracy Low Output Ripple Wide Input Voltage Range: 3 V to 28 V Output Voltage Range: 0.76 V to 5.5 V Low-Side RDS(ON) Loss-less Current Sensing Adaptive Gate Drivers With Integrated Boost Diode Internal 1.2-ms Voltage-Servo Soft-Start Powergood Signals for Each Channel With Delay Timer Output Discharge During Disable, Fault 2 Applications Notebook I/O and Low-Voltage System Bus 3 Description The TPS51124 is a dual, adaptive on-time D-CAP™ mode synchronous buck controller. The part enables system designers to cost effectively complete the suite of notebook power bus regulators with the absolute lowest external component count and lowest standby consumption. The fixed frequency emulated adaptive on-time control supports seamless operation between PWM mode at heavy load condition and reduced frequency operation at light load for high efficiency down to milliampere range. The main control loop for the TPS51124 uses the D-CAP mode that optimized for low ESR output capacitors such as POSCAP or S...