Texas Instruments TPS2091D

Overview

TPS2091D 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 active-low enable inputs. It operates from 2.7 V to 5.5 V, provides thermal and short-circuit protection with open-drain overcurrent outputs, and is used in USB peripheral power management and hot-plug subsystems.

For engineers reviewing the TPS2091D datasheet, TPS2091D pinout, TPS2091D application, or TPS2091D equivalent, key selection considerations include its dual-channel independent enable logic (EN1/EN2 both active-low), SOIC-8 package footprint, 2.5-ms typical rise time for EMI control, and integrated undervoltage lockout at ~2 V.

Technical Context

The TPS2091D integrates two independent high-side N-channel MOSFET switches with internal charge-pump gate drive, enabling full operation down to 2.7 V without external components. Each channel features separate enable (active-low) and overcurrent (OC) open-drain output signals.

It implements dual thermal trip points (~140°C primary, ~160°C secondary) for fault isolation: only the overloaded channel shuts down initially, preserving operation of the healthy channel. Current limiting is achieved via sense-FET-based monitoring, forcing constant-current mode (typ. 0.5 A short-circuit limit) before thermal shutdown.

Key Specifications

Pinout & Package

TPS2091D is housed in an 8-pin SOIC (D) package with standard 1.27-mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating. The package supports surface-mount reflow up to 260°C peak.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2091D, TPS2051BDR requires duplication for dual-rail use and lacks independent fault handling, while TPS2065D trades per-channel thermal autonomy for higher current capacity and simpler enable polarity - neither matches TPS2091D's combination of dual active-low control, 250 mA precision, and channel-isolated protection.

Availability

TPS2091D is available at Aetrix Electronics and suitable for USB peripheral power switching, hot-plug module control, and industrial I/O power management requiring stable component supply and long-term industrial temperature support (0°C to 85°C).

Supply support for TPS2091D 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 solutions, with decades of leadership in power-switching ICs.

The TPS209x family was designed specifically for robust, fault-tolerant power distribution in USB, hot-swap, and modular electronics - emphasizing channel independence, EMI-controlled switching, and seamless integration into space-constrained PCB layouts.

FAQ

What is the enable logic polarity for TPS2091D?

The TPS2091D uses active-low enable inputs: EN1 and EN2 must be driven low to turn on their respective power switches. When either enable pin is high, its channel is disabled and supply current drops to ≤10 μA. This logic matches common microcontroller GPIO defaults and simplifies pull-up resistor-based fail-safe configurations.

Does TPS2091D support bidirectional current flow?

No, TPS2091D is a unidirectional high-side switch. Its N-channel MOSFET architecture blocks reverse current from OUT to IN, preventing backfeed in multi-rail systems. It does not support true bidirectional conduction - the "bidirectional switch" feature cited in TI documentation refers to forward conduction capability under both polarities of enable logic, not physical current reversal.

How does the overcurrent (OC) pin behave during a fault on TPS2091D?

The OC pin on TPS2091D is an open-drain output asserted low during overcurrent or overtemperature conditions on either channel. It remains low until the fault is cleared and junction temperature falls below hysteresis threshold (~120°C). The pin does not indicate which channel faulted - it serves as a system-level fault flag requiring additional diagnostics.

What is the maximum continuous current per channel for TPS2091D?

The TPS2091D is rated for 250 mA continuous output current per channel under recommended operating conditions (T_A ≤ 85°C, V_IN = 5.5 V). At higher ambient temperatures or lower input voltages, derating applies - e.g., at 85°C ambient, power dissipation limits reduce usable current to maintain safe junction temperature.

Is TPS2091D pin-compatible with other devices in the TPS209x family?

TPS2091D shares the same SOIC-8 package and pinout with TPS2090D and TPS2092D, but enable logic differs: TPS2090D uses active-high EN1/EN2, TPS2092D uses active-low EN1 and active-high EN2, while TPS2091D uses active-low on both. Swapping requires firmware or schematic updates to match enable polarity - not drop-in compatible without design review.