Texas Instruments TPS259270DRCR

Overview

TPS259270DRCR from Texas Instruments is a 4.5-V to 18-V eFuse IC with integrated 28-mΩ pass MOSFET, latched thermal shutdown, reverse current blocking support via BFET pin, and adjustable 1-A to 5-A current limit set by external R_ILIM. It protects HDD/SSD drives, PCIe cards, and server AUX supplies against overcurrent, short circuit, inrush, and reverse current.

For engineers reviewing the TPS259270DRCR datasheet, TPS259270DRCR pinout, TPS259270DRCR application, or TPS259270DRCR equivalent, key selection criteria include latched fault response (vs. auto-retry), 28-mΩ R_DS(on) at 25°C, ±8% I_LIM accuracy at 3.7 A, programmable dV/dT slew rate, and UL 2367 recognition for safety-critical power distribution.

Technical Context

The TPS259270DRCR implements a precision current-limit amplifier with fast-trip comparator (160% of I_LIM) for sub-300-ns short-circuit response, coupled with thermal foldback that reduces I_LIM by 2–12% when internal power dissipation exceeds 10 W. Its BFET driver provides 2-µA gate charge and 26-Ω discharge path for external back-to-back NFET control.

Operation begins at VIN > 4.3 V (UVLO rising threshold), followed by EN/UVLO sampling; output ramp rate is programmable via dV/dT pin capacitor (0–1000 nF), and ILIM resistor sets both overload and short-circuit limits with single-point failure test compliance (UL60950) at R_ILIM = open or shorted.

Key Specifications

Pinout & Package

TPS259270DRCR uses a 10-pin VSON package (3.00 mm × 3.00 mm) with exposed thermal pad (EP) on underside for enhanced thermal performance. Pin numbering follows top-view layout with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259271DRCR and TPS25942ARVCR, the TPS259270DRCR uniquely combines latched fault response, BFET-controlled reverse blocking, and UL 2367 recognition in a 3-mm × 3-mm VSON package - making it the only option qualified for safety-critical, hot-swap-capable storage and server AUX rails.

Availability

TPS259270DRCR is available at Aetrix Electronics and suitable for HDD/SSD drives, server AUX supplies, and PCIe card power management requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for TPS259270DRCR 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The TPS25927x product line is engineered for robust power distribution in high-reliability computing infrastructure, emphasizing precise current limiting, thermal safety, and reverse current prevention in storage and server subsystems.

FAQ

What is the fault response behavior of the TPS259270DRCR during thermal shutdown?

The TPS259270DRCR features latched thermal shutdown: when junction temperature exceeds 150°C, the internal MOSFET turns off and remains latched in the OFF state until either the EN/UVLO pin is toggled (driven low then high) or main power is cycled. This prevents automatic restart into a sustained fault condition, enhancing system safety in server and storage applications where uncontrolled recovery could cause cascading failures. The TPS259270DRCR does not implement auto-retry like the TPS259271DRCR variant.

How does the BFET pin function in the TPS259270DRCR, and what external component is required?

The BFET pin on the TPS259270DRCR drives the gate of an external N-channel MOSFET connected back-to-back with the output to block reverse current flow from load to source - essential for SSDs with holdup capacitors. It sources 2 µA to charge the external FET gate and discharges it through a 26-Ω internal resistor for sub-microsecond turnoff. No additional driver IC is needed; only a single discrete NFET (e.g., DMN3025LSD) is required, connected between OUT and the load, with its gate tied to BFET and source to OUT.

What is the accuracy and adjustment range of the current limit in the TPS259270DRCR?

The TPS259270DRCR supports adjustable current limiting from 1 A to 5 A using a single external resistor (R_ILIM) connected between ILIM and GND. At 3.7 A, the limit accuracy is ±8% over temperature and process variation. The relationship is approximately I_LIM ≈ 0.7 + (3 × 10⁻⁵ × R_ILIM), with validated points at R_ILIM = 10 kΩ (1.02 A), 45.3 kΩ (2.10 A), 100 kΩ (3.75 A), and 150 kΩ (5.1 A). Open or shorted R_ILIM defaults to safe limits of 0.73 A or 0.84 A respectively.

Does the TPS259270DRCR support programmable output voltage ramp rate, and how is it implemented?

Yes, the TPS259270DRCR supports programmable output voltage ramp rate via the dV/dT pin. Connecting a capacitor (1–1000 nF) from dV/dT to GND sets the output slew time from 0.7 ms (1 nF) to 1.3 ms (1000 nF) for a full 0–VIN transition. The internal 220-nA current source charges the capacitor, and the resulting voltage controls the gate drive ramp of the internal MOSFET. Leaving dV/dT floating yields the minimum ramp time. This eliminates need for external RC timing networks or dedicated ramp controllers.

Is the TPS259270DRCR certified for safety standards, and which certifications apply?

Yes, the TPS259270DRCR is UL 2367 recognized (File E339631) when R_ILIM ≤130 kΩ, validating its use in end-equipment requiring safety certification. It also meets UL60950 single-point-failure test requirements for both open and shorted R_ILIM conditions. These certifications confirm robust fault handling for enterprise storage, servers, and industrial systems - distinguishing it from non-certified eFuses. TI provides supporting documentation including test reports and certification marks in the official product folder.