Texas Instruments TPS259621DDAT

Overview

TPS259621DDAT from Texas Instruments is a 2.7–19 V, 0.125–2-A eFuse IC with 89-mΩ on-resistance, fast 5-μs overvoltage clamp (3.8 V / 5.7 V / 13.8 V pin-selectable), auto-retry thermal shutdown, and ±10.4% current limit accuracy - used for robust input protection in energy meters and UL 60335-1 appliance power supplies.

For engineers reviewing the TPS259621DDAT datasheet, TPS259621DDAT pinout, TPS259621DDAT application, or TPS259621DDAT equivalent, key selection criteria include its SOIC-8 package with exposed thermal pad, OVCSEL pin-based voltage clamp selection, FLT open-drain fault indicator, ILM dual-function current limit/monitor pin, and auto-retry behavior under thermal fault conditions.

Technical Context

The TPS259621DDAT implements a precision current-limiting N-channel MOSFET switch with integrated charge pump gate drive, enabling stable operation across 2.7–19 V input. Its overvoltage response uses internal clamping circuitry-no external TVS required-with three fixed thresholds selected via OVCSEL pin resistance to GND (short, 400 kΩ, or open).

Thermal protection employs junction-sensing with 157°C trip and 11.5°C hysteresis; fault recovery is auto-retry (95-ms interval), distinguishing it from latch-off variants like TPS259620DDAT. Current monitoring delivers 656 µA/A gain with ≤±5.5% error at 1 A, referenced to ILM pin voltage.

Key Specifications

Pinout & Package

TPS259621DDAT is housed in an 8-pin SOIC package (4.91 mm × 3.9 mm) with exposed thermal pad (connected to GND) for enhanced thermal performance (R_θJA = 52.7°C/W with PCB ground plane).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar eFuse protection applications.

Compared with TPS259621DDAT, TPS259620DDAT offers identical protection features but latches off permanently on thermal fault - requiring system-level intervention - while TPS259421RVCT trades simplicity for higher performance and digital configurability in compact form factors.

Availability

TPS259621DDAT is available at Aetrix Electronics and suitable for energy metering, UL 60335-1 appliance power supplies, IP network cameras, and set-top boxes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS259621DDAT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability protection ICs.

The TPS2596xx family was designed specifically for robust, low-component-count eFuse protection in industrial and white-goods applications - emphasizing fast overvoltage response, accurate current monitoring, and thermal resilience without external complexity.

FAQ

What is the overvoltage clamp response time of the TPS259621DDAT?

The TPS259621DDAT achieves a 5-μs typical response time from overvoltage event onset to output clamping. This is measured with I_OUT = 2 A and applies to all three pin-selectable thresholds (3.8 V, 5.7 V, 13.8 V). The fast response prevents downstream IC damage during lightning-induced surges or regulator failures, and is enabled by internal clamping circuitry - no external components required. TPS259621DDAT's 5-μs spec is consistent across temperature and input voltage ranges per TI SLVSET8A datasheet Section 7.6.

How does the TPS259621DDAT implement auto-retry thermal shutdown?

The TPS259621DDAT triggers thermal shutdown at 157°C junction temperature and enters auto-retry mode with a fixed 95-ms interval between attempts. After shutdown, the device disables the FET, cools passively, and automatically re-enables after 95 ms - repeating until fault condition clears. This behavior is intrinsic to the TPS259621DDAT variant (denoted by "21" suffix) and differs from latch-off versions like TPS259620DDAT. The retry timer is internal and requires no external components.

Can the TPS259621DDAT current limit be adjusted, and what is its accuracy?

Yes, the TPS259621DDAT current limit is adjusted using a single external resistor (R_ILM) connected from ILM pin to GND, supporting 0.125–2 A range. Accuracy is ±10.4% maximum across the full range, and ±5.5% maximum at 1-A setting. This is verified per TI SLVSET8A datasheet Section 7.5, where R_ILM = 453 Ω yields 2.004 A (typ) with 1.83–2.147 A min/max bounds. The ILM pin also provides proportional voltage for real-time current monitoring.

What package type and thermal characteristics does the TPS259621DDAT use?

The TPS259621DDAT uses an 8-pin SOIC package (DDA suffix) with 4.91 mm × 3.9 mm body and exposed thermal pad. With the pad soldered to a PCB ground plane, its junction-to-ambient thermal resistance is 52.7°C/W. The pad must be connected to system ground for optimal thermal performance - not left floating - as specified in TI SLVSET8A Section 7.4. This package enables compatibility with standard SOIC footprints while delivering sufficient thermal headroom for 2-A continuous operation.

Does the TPS259621DDAT require external components for overvoltage protection?

No, the TPS259621DDAT provides fully integrated overvoltage clamp protection with no external components required. Its OVCSEL pin selects one of three fixed clamp thresholds (3.8 V, 5.7 V, or 13.8 V) via simple termination: short-to-GND, 400-kΩ-to-GND, or open. This eliminates external TVS diodes, Zener regulators, or comparator circuits - reducing BOM cost and board area. The clamp activates in 5 μs and holds output within ±0.3 V of threshold during fault, per TI SLVSET8A Electrical Characteristics table.