Product Descriptions

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 0.7 V to 5.9 V, while the output of SMPS2 can be adjusted from 0.5 V to 2.5 V. 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. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. RDS(on) current sensing methods offers maximum cost saving.

The TPS51427 supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm × 5-mm QFN package (Green, RoHs- compliant, and Pb-free). The device is specified from –40°C to +85°C.

Product Features

• 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

Product Applications

• Notebook I/O and System Bus Rails

• Graphics Application

• PDAs and Mobile Communication Devices

Product Specification

Product Photos

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