3V to 28V Input. 20A Synchronous Step Down Controller with DCAP™ Mode for Notebook Power Suppl


Product details


Vin (Min) (V) 3 Vin (Max) (V) 28 Vout (Min) (V) 0.7 Vout (Max) (V) 2.6 Iout (Max) (A) 20 Iq (Typ) (mA) 0.32 Iq (Typ) (uA) 320 Switching frequency (Min) (kHz) 266 Switching frequency (Max) (kHz) 465 Features Enable, Light Load Efficiency, 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

WSON (DSC) 10 9 mm² 3.00 x 3.00 WSON (DSC) 10 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)


  • Wide Input Voltage Range: 3 V to 28 V
  • Output Voltage Range: 0.7 V to 2.6 V
  • Wide Output Load Range: 0 to 20A+
  • Built-in 0.5% 0.7 V Reference
  • D-CAP™ Mode with 100-ns Load Step Response
  • Adaptive On Time Control Architecture With 4 Selectable
    Frequency Setting
  • 4700 ppm/°C RDS(on) Current Sensing
  • Internal 1-ms Voltage Servo Softstart
  • Pre-Charged Start-up Capability
  • Built in Output Discharge
  • Power Good Output
  • Integrated Boost Switch
  • Built-in OVP/UVP/OCP
  • Thermal Shutdown (Non-latch)
  • SON-10 (DSC) Package
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The TPS51218 is a small-sized single buck controller with adaptive on-time D-CAP™ mode. The device is suitable for low output voltage, high current, PC system power rail and similar point-of-load (POL) power supply in digital consumer products. A small package with minimal pin-count saves space on the PCB, while a dedicated EN pin and pre-set frequency selections minimize design effort required for new designs. The skip-mode at light load condition, strong gate drivers and low-side FET RDS(on) current sensing supports low-loss and high efficiency, over a broad load range. The conversion input voltage which is the high-side FET drain voltage ranges from 3 V to 28 V and the output voltage ranges from 0.7 V to 2.6 V. The device requires an external 5-V supply. The TPS51218 is available in a 10-pin SON package specified from –40°C to 85°C.

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Technical documentation

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Type Title Date
* Datasheet Step-Down Controller for Notebook Power Supply datasheet (Rev. B) Jan. 31, 2012
Application notes Intel Core i3, i5, i7 [Arrandale] Reference Design Jul. 21, 2010
User guides TPS51218EVM User's guide Jan. 19, 2010

Design & development

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Design tools & simulation

SLIM117A.ZIP (49 KB) - PSpice Model
SLUM152.TSC (210 KB) - TINA-TI Reference Design
SLUM153.ZIP (48 KB) - TINA-TI Spice Model
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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
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Reference designs

Synchronous Buck for Intel Core i3, i5, i7 Arrandale SV (1.8V @ 1A)
PMP5783 — PMP5783 is a complete Intel IMVP6.5 Arrandale SV/Clarksfield SV Power Reference Design. Vin is 8-15V. Main CPU is powered by two phase TPS59621. TPS59611 powers graphics processor. DDR3 memory powered by TPS5126. Both 1.05V’s are each powered by TPS51218. Dual TPS51125A powers 5V and 3.3V (...)

CAD/CAE symbols

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WSON (DSC) 10 View options

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