1.8-V to 28-V, synchronous D-CAP buck contoller with light load efficiency


Product details


Vin (Min) (V) 1.8 Vin (Max) (V) 28 Vout (Min) (V) 0.76 Vout (Max) (V) 5.5 Iout (Max) (A) 10 Iq (Typ) (uA) 400 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 550 Features Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 1 Number of phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

TSSOP (PW) 14 32 mm² 5 x 6.4 VQFN (RGY) 14 12 mm² 3.5 x 3.5 open-in-new Find other Buck controllers (external switch)


  • High Efficiency, Low Power Consumption, 4.5-µA
    Typical Shutdown Current
  • Fixed Frequency Emulated On-Time Control,
    Adjustable from 100 kHz to 550 kHz
  • D-CAP™ Mode With 100-ns Load Step Response
  • < 1% Initial Reference Accuracy
  • Output Voltage Range: 0.75 V to 5.5 V
  • Wide Input Voltage Range: 1.8 V to 28 V
  • Selectable Auto-Skip/PWM-Only Operation
  • Temperature Compensated (4500 ppm/°C)
    Low-Side RDS(on) Overcurrent Sensing
  • Negative Overcurrent Limit
  • Integrated Boost Diode
  • Integrated OVP/UVP and Thermal Shutdown
  • Powergood Signal
  • Internal 1.2-ms Voltage Soft-Start
  • Integrated Output Discharge (Soft-Stop)
    • Notebook Computers
    • I/O Supplies
    • System Power Supplies

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The TPS51117 device is a cost-effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for the operation of the Adaptive On-Time D-CAP mode. This mode provides ease-of-use, low external component count, and fast transient response. Auto-skip mode for high efficiency down to the milliampere load range, or PWM-only mode for low-noise operation is selectable.

The current-sensing scheme for positive overcurrent and negative overcurrent protection is loss-less low-side RDS(on) sensing plus temperature compensation. The device receives a 5-V (4.5 V to 5.5 V) supply from another regulator such as the TPS51120 or TPS51020. The conversion input can be either VBAT or a 5-V rail, ranging from 1.8 V to 28 V, and the output voltage range is from 0.75 V to 5.5 V.

The TPS51117 is available in a 14-pin VQFN or a 14-pin TSSOP package and is specified from –40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet TPS51117 Single Synchronous Step-Down Controller datasheet (Rev. C) May 15, 2015
Technical article Embedded Computers with TI Power in a myriad of applications May 15, 2010
User guide High Performance Synchronous Buck EVM Using the TPS51117 (Rev. A) Apr. 01, 2009

Design & development

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Design tools & simulation

SLVJ001D.ZIP (43 KB) - PSpice Model
SLVJ002C.TSC (403 KB) - TINA-TI Reference Design
SLVM020A.ZIP (35 KB) - TINA-TI Spice Model
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CAD/CAE symbols

Package Pins Download
TSSOP (PW) 14 View options
VQFN (RGY) 14 View options

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