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Dual D-CAP™Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled


Package | PIN: RHB | 32
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $6.02
10-24 $5.42
25-99 $5.06
100-249 $4.54
250-499 $4.24
500-749 $3.69
750-999 $3.19
1000+ $3.13


  • 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
    • Notebook I/O and System Bus Rails
    • Graphics Application
    • PDAs and Mobile Communication Devices

D-CAP, OOA are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.

Texas Instruments  TPS51427ARHBT

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 counts. The TPS51427A 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 TPS51427A 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.