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) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7V to 5.9V, while the output of SMPS2 can be adjusted from 0.5V to 2.5V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency.
●FEATURES
●• Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three Options
●• D-CAP™ Mode Enables Fast Transient Response Less than 100ns
●• Advanced Ramp Compensation Allows Low Output Ripple with Minimal Jitter
●• Selectable PWM-Only/OOA™/Auto-Skip Modes
●• Wide Input Voltage Range: 5.5V to 28V
●• Dual Fixed or Adjustable SMPS:
● – 0.7V to 5.9V (Channel1)
● – 0.5V to 2.5V (Channel2)
●• Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100mA
●• Fixed 3.3-VREF Output Capable of Sourcing 10mA
●• 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
