Radiation-hardness-assured (RHA), 3-V to 5.5-V input, 3-A, synchronous step-down converter

Radiation-hardness-assured (RHA), 3-V to 5.5-V input, 3-A, synchronous step-down converter



Product details


Vin (Min) (V) 3 Vin (Max) (V) 5.5 Vout (Min) (V) 0.804 Vout (Max) (V) 5.3 Iout (Max) (A) 3 Iq (Typ) (uA) 2500 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO Adjustable Operating temperature range (C) 25 to 25, -55 to 125 Rating Space Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

CFP (HKH) 20 CFP (HKH) 20 94 mm² 12.7 x 2.9 open-in-new Find other Buck converters (integrated switch)


  • Radiation performance:
    • Radiation-hardness-assured up to TID 100 krad(Si)
    • SEL, SEB, and SEGR immune to LET = 75 MeV-cm2/mg
    • SET and SEFI characterized up to LET = 75 MeV-cm2/mg
  • Peak efficiency: 96.9% (VO = 2.5 V)
  • Integrated 50-mΩ and 35-mΩ MOSFETs
  • Power rail: 3 to 5.5 V on VIN
  • 3-A maximum output current
  • Flexible switching frequency options:
    • 100-kHz to 1-MHz adjustable internal oscillator
    • External sync capability: 100 kHz to 1 MHz
    • SYNC pin can be configured as a 500-kHz output for primary-secondary applications
  • 0.807-V ±1.5% voltage reference over temperature, radiation, and line and load regulation
  • Monotonic start-up into prebiased outputs
  • Adjustable soft start through external capacitor
  • Input enable and power-good output for power sequencing
  • Power good output monitor for undervoltage and overvoltage
  • Adjustable input undervoltage lockout (UVLO)
  • 20-pin ultra-small, thermally-enhanced ceramic flatpack package (HKH) for space applications
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The TPS7H4002-SP is a radiation hardened, 5.5-V, 3-A synchronous step-down converter, which is optimized for small designs through high efficiency and by integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and a high switching frequency, which reduces the inductor footprint.

The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins. In addition, the TPS7H4002-SP can be configured in primary-secondary mode for parallel operation.

Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when die temperature exceeds thermal limit.

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Technical documentation

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Type Title Date
* Data sheet TPS7H4002-SP Radiation-Hardness-Assured 3-V to 5.5-V Input, 3-A Synchronous Step Down Converter datasheet (Rev. A) Aug. 18, 2021
* SMD TPS7H4002-SP SMD 5962-20210 Sep. 02, 2021
* Radiation & reliability report TPS7H4002-SP Total Ionizing Dose (TID) (Rev. A) Aug. 31, 2021
* Radiation & reliability report TPS7H4002-SP Neutron Displacement Damage (NDD) Characterization Jul. 28, 2021
* Radiation & reliability report Single-Event Effects Test Report of the TPS7H4002-SP Sync Step-Down Converter Jun. 10, 2021
User guide TPS7H4002EVM-CVAL Evaluation Module User's Guide May 25, 2021
Selection guide TI Space Products (Rev. H) Jan. 27, 2021
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer Aug. 21, 2020
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations May 18, 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form May 18, 2020
Application note Single-Event Effects Confidence Interval Calculations Jan. 14, 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing Jun. 17, 2019
E-book Radiation Handbook for Electronics (Rev. A) May 21, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide

The TPS7H4002EVM-CVAL demonstrates how the radiation-hardened TPS7H4002-SP buck converter provides a regulated power rail capable of load current up to 3 A to support typical space-grade power-managemnet applications.

  • Radiation-hardened 18-A point-of-load (POL) buck converter for space applications
  • Input range: 3 V to 5.5 V
  • Output up to 3 A
  • Radiation hardness assured (RHA)

Design tools & simulation

SLVMDO0.ZIP (26 KB) - PSpice Model
SLVMDO1.ZIP (42 KB) - PSpice 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
  • 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
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CAD/CAE symbols

Package Pins Download
(KGD) 0 View options
CFP (HKH) 20 View options

Ordering & quality

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