TPS51427

TPS51427 www.ti.com................................................................................................................................................ SLUS819B – APRIL 2008 – REVISED SEPTEMBER 2008 DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER RAILS FEATURES 1 23 Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three Options D-CAP™ Mode Enables Fast Transient Response Less than 100 ns Advanced Ramp Compensation Allows Low Output Ripple with Minimal Jitter Selectable PWM-Only/OOA™/Auto-Skip Modes Wide Input Voltage Range: 5.5 V to 28 V Dual Fixed or Adjustable SMPS: – 0.7 V to 5.9 V (Channel1) – 0.5 V to 2.5 V (Channel2) Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mA Fixed 3.3-VREF Output Capable of Sourcing 10 mA Temperature Compensated Low-Side RDS(on) Current Sensing Adaptive Gate Drivers with Integrated Boost Switch Bootstrap Charge Auto Refresh Integrated Soft Start, Tracking Soft Stop Independent PGOOD and EN for Each Channel APPLICATIONS Notebook I/O and System Bus Rails Graphics Application PDAs and Mobile Communication Devices DESCRIPTION The TPS51427 is a dual synchronous step-down controller designed for notebook and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts. The TPS51427 includes two pulse-width-modulation (PWM) contr...