4.5 V to 18 V input, 1.2 MHz, 1.5 / 2.5 A dual synchronous step-down converter


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.8 Vout (Max) (V) 14 Iout (Max) (A) 2.5 Iq (Typ) (uA) 1800 Switching frequency (Min) (kHz) 1200 Switching frequency (Max) (kHz) 1200 Features Enable, Phase Interleaving, Synchronous Rectification Operating temperature range (C) -40 to 145 Rating Catalog Regulated outputs (#) 2 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 16 32 mm² 5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • 4.5-V to 18-V Input Range
  • Output Voltage Range 0.8 V to DMAX × VIN
  • Fully Integrated Dual Buck: 1.5 A and 2.5 A
  • Three Fixed Switching Frequency Versions:
    • TPS54290: 300 kHz
    • TPS54291: 600 kHz
    • TPS54292: 1.2 MHz
  • Integrated UVLO
  • 0.8 VREF With 1% Accuracy (0°C to 85°C)
  • Internal Soft Start:
    • TPS54290: 5.2 ms
    • TPS54291: 2.6 ms
    • TPS54292: 1.3 ms
  • Dual PWM Outputs 180° Out-of-Phase
  • Dedicated Enable for Each Channel
  • Current Mode Control for Simplified Compensation
  • External Compensation
  • Pulse-by-Pulse Overcurrent Protection, 2.2-A and 3.8-A Overcurrent Limit
  • Integrated Bootstrap Switch
  • Thermal Shutdown Protection at 145°C
  • 16-Pin PowerPAD™ HTSSOP Package
    • Set-Top Boxes
    • Digital TVs
    • Power for DSP
    • Consumer Electronics

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The TPS54290, TPS54291, and TPS54292 devices are dual-output, fully synchronous buck converters capable of supporting applications with a minimal number of external components. It operates from a 4.5-V to 18-V input supply voltage, and supports output voltages as low as 0.8 V and as high as 90% of the input voltage.

Both high-side and low-side MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. Channel 1 can provide up to 1.5 A of continuous current. Meanwhile, Channel 2 supports up to 2.5 A.

Current mode control simplifies the compensation. The external compensation adds flexibility for the user to choose different type of output capacitors.

180° out-of-phase operation reduces the ripple current through the input capacitor, providing the benefit of reducing input capacitance, alleviating EMI and increasing capacitor life.

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Technical documentation

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Type Title Date
* Data sheet TPS5429x 1.5-A and 2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET datasheet (Rev. A) Dec. 29, 2016
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Understanding Thermal Dissipation and Design of a Heatsink May 04, 2011

Design & development

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

Hardware development

document-generic User guide
The TPS54291EVM-431 evaluation module (EVM) is a dual synchronous buck converter providing fixed 3.3V and 1.2V outputs at up to 1.5A and 2.5A respectively from a 12V bus. The EVM is designed to start-up from a single supply, so no additional bias voltages are require for start-up. The module uses (...)
  • 12 V +10% /–20% input range
  • 5.0 V and 3.3 V fixed output voltage, adjustable with resistor change
  • 1.5A (3.3V) and 2.5A (1.2V) Steady State Current
  • 600kHz switching frequency (Fixed by TPS54291)
  • Internal switching MOSFET and external Rectifier Diode
  • Double Sided 2 Active Layer PCB with all components on (...)

Design tools & simulation

SLIM099A.ZIP (93 KB) - PSpice Model
SLUM160.TSC (152 KB) - TINA-TI Reference Design
SLUM161.ZIP (34 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

5V Input Dual Sync Buck (1.8V@ 1A)
PMP5136 — The PMP5136 reference design uses the TPS54292 to generate 3.3V/1A and 1.8V/1A from a 5V input source. The electrical components on this compact design consume less than 1/3 of an inch of board space on a single-sided PCB. The 1.8V switcher has a peak efficiency of over 89%, while the peak (...)
Design files

CAD/CAE symbols

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