TPS51427A

TPS51427A www.ti.com .................................................................................................................................................. SLUS843B – MAY 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 OOB Function Disabled. Refer to TPS51427 for OOB-Enabled Device APPLICATIONS Notebook I/O and System Bus Rails Graphics Application PDAs and Mobile Communication Devices DESCRIPTION The TPS51427A 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...