TPS7H4003-SEP Synchronous Step-Down Converter Single-Event Effects (SEE)

Abstract

The purpose of this study is to characterize the single-event-effects (SEE) performance due to heavy-ion irradiation of the TPS7H4003-SEP. Heavy-ions with LET_EFF of 48.2 MeV·cm²/mg were used to irradiate 3 production devices. Flux of ≈10⁵ ions/cm²·s and fluence of ≈10⁷ ions/cm² per run were used for the characterization. The results demonstrated that the TPS7H4003-SEP is SEL and SEB/SEGR-free up to 48.2 MeV·cm²/mg, at T = 125°C and T = 25°C, respectively, and across the full electrical specifications. SET transients performance for output voltage excursions ≥ |3%| from the nominal voltage and PGOOD ≤ V_IN – 0.5 V are presented and discussed.

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1 Introduction

The TPS7H4003-SEP is an space-enhanced-plastic, 3-V to 7-V input, 18-A, synchronous step-down buck point-of-load (POL) voltage converter. The device provides exceptional efficiency and output accuracy in a very small design size. Along with the small design size, the configurable switching frequency (0.1 to 1 MHz), can reduce the output filter lumped components, optimizing the power density (W/in³). The TPS7H4003-SEP has many use cases, as well as circuit protection capabilities, enabled by the following features:

A voltage start-up ramp controlled by the SS/TR pin for different operations.
Power sequencing through enable and power good configurations.
Ability to configure in primary-secondary mode depending on the SYNC2 pin.
Cycle-by-cycle current limiting on high-side FET to protect the device in overload situations.
Low-side-sourcing current protection to prevent current runaway.
Low-side-sinking current protection turns off low-side MOSFET to prevent reverse current.
Thermal shutdown disables the part when die temperature exceeds thermal limit.

The device is offered in a 44-pin plastic package. General device information and test conditions are listed in Table 1-1. For more detailed technical specifications, user guides, and application notes, see the TPS7H4003-SEP product page.

Table 1-1 Overview Information

DESCRIPTION⁽¹⁾	DEVICE INFORMATION
TI Part Number	TPS7H4003-SEP
Orderable Number	TPS7H4003MDDWSEP
Device Function	Point-of-load (POL) switching regulator
Technology	LBC7
Exposure Facility	Radiation Effects Facility, Cyclotron Institute, Texas A&M University (15 MeV/nucleon)
Heavy Ion Fluence per Run	9.95 × 10⁶ – 1 × 10⁷ ions/cm²
Irradiation Temperature	25°C (for SET and SEB/SEGR testing) and 125°C (for SEL testing)

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