Texas Instruments TPS2091DR

Overview

TPS2091DR from Texas Instruments is a dual-channel high-side power-distribution switch featuring two independent 80-mΩ N-channel MOSFETs, 250 mA continuous current per channel, and integrated thermal/short-circuit protection with open-drain overcurrent (OC) outputs. It operates from 2.7 V to 5.5 V, supports CMOS/TTL enable inputs, and is used in hot-plug USB peripherals, embedded system power rail control, and modular backplane interfaces.

For engineers reviewing the TPS2091DR datasheet, TPS2091DR pinout, TPS2091DR application, or TPS2091DR equivalent, key selection criteria include per-channel current limiting (0.5 A short-circuit trip), 2.5-ms typical rise time for EMI control, undervoltage lockout (~2 V threshold), bidirectional switching capability, and SOIC-8 package compatibility with tape-and-reel delivery.

Technical Context

The TPS2091DR implements two independent high-side N-channel MOSFET switches controlled by active-low enable inputs (EN1, EN2), each with dedicated overcurrent sensing and thermal shutdown circuitry. Its internal charge pump enables full gate drive down to 2.7 V input without external components, ensuring reliable turn-on across the full operating range.

Each channel features independent constant-current limiting (typ. 0.5 A), automatic thermal recovery with ~20°C hysteresis, and an open-drain OC output that asserts low during overcurrent or junction temperature >140°C. The device uses sense-FET current monitoring-not shunt resistors-minimizing conduction loss and eliminating added series resistance in the power path.

Key Specifications

Pinout & Package

TPS2091DR is housed in an 8-pin SOIC (D) package, RoHS-compliant, green (Pb-free, no Sb/Br), moisture sensitivity level 1, rated for 260°C peak reflow. Tape-and-reel packaging (2500 units/reel) is standard per orderable suffix 'R'.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel high-side power switch applications.

Compared with TPS2091DR, TPS2051BDR increases component count and board area for dual-rail use, while AP2152MPG-13 trades per-channel thermal autonomy for higher current rating and different enable polarity - making TPS2091DR optimal for compact, fault-isolated 250 mA dual-rail designs.

Availability

TPS2091DR is available at Aetrix Electronics and suitable for USB peripheral interfaces, hot-swap backplane modules, and embedded rail sequencing requiring stable component supply, long-term lifecycle support, and tape-and-reel logistics for automated assembly.

Supply support for TPS2091DR 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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power-switching solutions.

The TPS209x family was designed specifically for robust hot-plug and capacitive-load power distribution in computing, industrial, and communications equipment - emphasizing fault containment, EMI control, and supply-voltage flexibility.

FAQ

What is the enable logic polarity for TPS2091DR?

The TPS2091DR uses active-low enable inputs: EN1 and EN2 must be driven low to turn on their respective channels. This is confirmed in the Terminal Functions table for TPS2091D/TPS2091DR, where both EN1 and EN2 are defined as "Enable input. Active low turns on power switch." The device supports CMOS- and TTL-compatible voltage levels, with VIH ≥2 V and VIL ≤0.4 V across the 2.7–5.5 V input range.

Does TPS2091DR support bidirectional current flow?

TPS2091DR is configured as a high-side N-channel MOSFET switch and provides bidirectional blocking - it prevents current flow from OUT to IN *and* from IN to OUT when disabled. However, it only conducts unidirectionally (IN → OUT) when enabled. The datasheet explicitly states: "Configured as a high-side switch, the power switch prevents current flow from OUTx to IN and IN to OUTx when disabled." So TPS2091DR does not support reverse conduction during normal operation.

What is the short-circuit current limit for TPS2091DR?

The TPS2091DR limits short-circuit output current to a typical value of 0.5 A per channel, with a minimum of 0.3 A and maximum of 0.7 A, as specified in the Electrical Characteristics table under "IOS Short-circuit output current." This limit is enforced via constant-current mode activation when overload or short conditions are detected by the internal sense-FET circuitry - independent of input voltage within the 2.7–5.5 V range.

How does the OC pin function on TPS2091DR?

The OC pin on TPS2091DR is an open-drain output that pulls low when *either* channel experiences overcurrent *or* overtemperature (junction >140°C). It remains asserted until the fault condition is removed. As a shared indicator, it does not distinguish between Channel 1 and Channel 2 faults. An external pull-up resistor is required; the datasheet specifies a 10 mA sink capability and 0.5 V max VOL at 5 mA, confirming its compatibility with standard logic-level interfacing.

Is TPS2091DR compatible with 3.3 V logic enable signals?

Yes, TPS2091DR is fully compatible with 3.3 V logic enable signals. Its enable inputs meet CMOS/TTL thresholds: VIH (high-level input) is ≥2 V for 2.7–5.5 V supply operation, and VIL (low-level input) is ≤0.4 V. A 3.3 V microcontroller GPIO driving EN1 or EN2 low (0 V) will reliably enable the channel, while driving it high (3.3 V) satisfies the VIH requirement and disables the switch - all within guaranteed specs across temperature and voltage ranges.