7V to 18V Input, 4.5A Synchronous Step-Down DCAP2 Mode Converter


Product details


Vin (Min) (V) 7 Vin (Max) (V) 18 Vout (Min) (V) 0.76 Vout (Max) (V) 5.5 Iout (Max) (A) 4.5 Iq (Typ) (uA) 850 Switching frequency (Min) (kHz) 700 Switching frequency (Max) (kHz) 700 Features Enable, Power Good, Synchronous Rectification, Soft Start Adjustable Operating temperature range (C) -20 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 14 32 mm² 5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • D-CAP2™ Mode Enables Fast Transient Response
  • Low Output Ripple and Allows Ceramic Output Capacitor
  • Wide VIN Input Voltage Range: 7 V to 18 V
  • Output Voltage Range: 0.76 V to 5.5 V
  • Highly Efficient Integrated FET’s Optimized
    for Lower Duty Cycle Applications
    – 63 mΩ (High Side) and 55 mΩ (Low Side)
  • High Efficiency, less than 10 µA at shutdown
  • High Initial Bandgap Reference Accuracy
  • Adjustable Soft Start
  • Pre-Biased Soft Start
  • 700-kHz Switching Frequency (fSW)
  • Cycle By Cycle Over Current Limit
  • Power Good Output
    • Wide Range of Applications for Low Voltage System
      • Digital TV Power Supply
      • High Definition Blu-ray Disc™ Players
      • Networking Home Terminal
      • Digital Set Top Box (STB)

SWIFT, D-CAP2, PowerPAD are trademarks of Texas Instruments.
Blu-ray Disc is a trademark of Blu-ray Disc Association.

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The TPS54429 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54429 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, low standby current solution. The main control loop for the TPS54429 uses the D-CAP2™ mode control which provides a very fast transient response with no external compensation components. The TPS54429 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 7-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 5.5 V. The device also features an adjustable soft start time and a power good function. The TPS54429 is available in the 14-pin HTSSOP package, and designed to operate from –20°C to 85°C.

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TPS54525 ACTIVE 4.5V to 18V Input, 5.5-A Synchronous Step-Down Converter This product offers higher current (5.5 A).
Similar but not functionally equivalent to the compared device:
TPS565208 ACTIVE 4.5V to 17V, 5A Synchronous Step-Down Voltage Regulator in SOT23 Simplify design with minimum external component count.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet 7V to 18V Input, 4.5-A Synchronous Step-Down SWIFTTM Converter datasheet Jan. 19, 2011
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note D-CAP2 Frequency Response Model, based on frequency domain analysis of Fixed On- Jan. 02, 2013
User guide TPS54429EVM-608, 4.5-A, SWIFT(TM) Regulator Evaluation Module Mar. 21, 2011

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

The TPS54429EVM-608 is a fully assembled and tested circuit for evaluating the TPS54429 Synchronous Step-Down SWIFT Converter with D-CAP2 Mode. The TPS54429EVM-608 operates from a 7V to 18V input and provides a 1.05V output at 4.5A.
  • D-CAP2 Mode Enables Fast Transient Response
  • Low Output Ripple and Allows Ceramic Output Capacitor
  • Wide Vin Input Voltage Range: 7V to 18V
  • Output Voltage Range: 0.76V to 5.5V
  • Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications
  • High Efficiency, less than 10uA at shutdown
  • High (...)

Design tools & simulation

SLVM126A.ZIP (42 KB) - PSpice Model
SLVM375.TSC (655 KB) - TINA-TI Reference Design
SLVM376.ZIP (41 KB) - TINA-TI Spice Model
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 (...)
  • 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

66AK2Gx DSP + ARM Processor Power Solution Reference Design
TIDEP0067 — This reference design is  based on the 66AK2Gx multicore System-on-Chip (SoC) processor and companion TPS65911 power management integrated circuit (PMIC) which includes power supplies and power sequencing for the 66AK2Gx processor in a single device. This power solution design also includes the (...)
document-generic Schematic
Non-Isolated Buck for Consumer Electronics using TPS54326 w/ input of 12 VDC 1.8V@1.74A
PMP7170 — The PMP7170.1(5V@4.4A) reference design is a 47W DC/DC sync Buck which uses a TPS54429 and was intended for Consumer Electronics applications. It can generate a Non-Isolated 5 volt output at 4.4 Amps from an input of 12 Volts DC. This design has multiple outputs.
Design files

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 14 View options

Ordering & quality

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