TPS51124

ACTIVE

Dual, Synchronous Step Down Controller for Low Voltage System Power

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 28 Vout (Min) (V) 0.76 Vout (Max) (V) 5.5 Iout (Max) (A) 15 Iq (Typ) (mA) 0.35 Iq (Typ) (uA) 350 Switching frequency (Min) (kHz) 240 Switching frequency (Max) (kHz) 420 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of Phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Buck controllers (external switch)

Features

  • High Efficiency, Low-Power Consumption, Shutdowns to <1 µA
  • Fixed Frequency Emulated On-Time Control, Frequency Selectable
    From Three Options
  • D-CAP Mode Enables Fast Transient Response
  • Auto-Skip Mode
  • Less Than 1% Initial Reference Accuracy
  • Low Output Ripple
  • Wide Input Voltage Range: 3 V to 28 V
  • Output Voltage Range: 0.76 V to 5.5 V
  • Low-Side RDS(ON) Loss-less Current Sensing
  • Adaptive Gate Drivers With Integrated Boost Diode
  • Internal 1.2-ms Voltage-Servo Soft-Start
  • Powergood Signals for Each Channel With Delay Timer
  • Output Discharge During Disable, Fault
  • APPLICATIONS
    • Notebook I/O and Low-Voltage System Bus

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Description

The TPS51124 is a dual, adaptive on-time D-CAP™ mode synchronous buck controller. The part enables system designers to cost effectively complete the suite of notebook power bus regulators with the absolute lowest external component count and lowest standby consumption. The fixed frequency emulated adaptive on-time control supports seamless operation between PWM mode at heavy load condition and reduced frequency operation at light load for high efficiency down to milliampere range. The main control loop for the TPS51124 uses the D-CAP mode that optimized for low ESR output capacitors such as POSCAP or SP-CAP promises fast transient response with no external compensation. Simple and separate power good signals for each channel allow flexibility of power sequencing. The part provides a convenient and efficient operation with supply input voltages (V5IN, V5FILT) ranging from 4.5 V to 5.5 V, conversion voltages (drain voltage for the synchronous high-side MOSFET) from 3 V to 28 V and output voltages from 0.76 V to 5.5 V.

The TPS51124 is available in 24-pin VQFN package specified from –40°C to 85°C ambient temperature range.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet TPS51124 Dual Synchronous Step-Down Controller for Low-Voltage Power Rails datasheet (Rev. C) Dec. 31, 2014
Application notes Intel Core i3, i5, i7 [Arrandale] Reference Design Jul. 21, 2010
Technical articles Embedded Computers with TI Power in a myriad of applications May 15, 2010
User guides Using the TPS51124 (Rev. A) Jun. 30, 2008
Application notes Adaptive Constant On-Time (D-CAPTM) Control Study in Notebook Applications (Rev. B) Dec. 04, 2007

Design & development

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Design tools & simulation

SIMULATION MODELS Download
SLVJ003B.ZIP (95 KB) - PSpice Model
SIMULATION MODELS Download
SLVJ004B.ZIP (117 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM021.ZIP (18 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Dual sync Buck with TPS51124
PMP4575 — Synchronous dual output buck converter supplies two cores with 7A each out of 5V to 20V source
Design files

CAD/CAE symbols

Package Pins Download
VQFN (RGE) 24 View options

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