Texas Instruments TPS2157IDGQ

Overview

TPS2157IDGQ from Texas Instruments is a dual-channel high-side power-distribution switch with integrated 3.3-V/200-mA fixed-output LDO, housed in a 10-pin MSOP PowerPAD package. It features two 340-mΩ (typ.) N-channel MOSFETs, independent thermal/short-circuit protection per channel, and active-high enable inputs. It is designed for USB 2.0 bus-powered hubs and portable electronics requiring segmented power control and core/I/O voltage sequencing.

For engineers reviewing the TPS2157IDGQ datasheet, TPS2157IDGQ pinout, TPS2157IDGQ application, or TPS2157IDGQ equivalent, key selection considerations include its 2.9–5.5-V input range, 340-mΩ on-resistance at 25°C, 3.3-V LDO with 0.35-V dropout, independent overcurrent flag outputs (OC1/OC2), and MSOP-10 PowerPAD thermal performance for space-constrained designs.

Technical Context

The TPS2157IDGQ integrates two independently controlled high-side N-channel MOSFET switches and a fixed 3.3-V LDO regulator sharing VIN/SWIN1 as primary supply. Each switch employs a charge pump for gate drive, enabling fast turn-on/turn-off (0.1–6 ms) without external components while minimizing inrush current surges.

It implements dual-threshold thermal protection (120°C first trip, 155°C second trip), per-channel overcurrent detection with transient-filtered open-drain OC flags, and undervoltage lockout (~2.2–2.85 V) on both VIN/SWIN1 and SWIN2 inputs - all operating across −40°C to 85°C ambient.

Key Specifications

Pinout & Package

TPS2157IDGQ uses a 10-pin MSOP (DGQ) package with an exposed thermal pad (PowerPAD™). The package measures 3.0 mm × 3.0 mm × 1.0 mm and requires soldering of the exposed pad to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-switch + LDO power management applications.

Compared with TPS2147IDGQ, TPS2157IDGQ simplifies control logic by eliminating external inverters; compared with TPD3S014RTER, it delivers true dual-rail independence and lower LDO dropout for 3.3-V logic domains - making it optimal for compact, multi-peripheral USB hubs and portable DSP systems.

Availability

TPS2157IDGQ is available at Aetrix Electronics and suitable for USB 2.0 hubs, portable audio systems, and DSP power sequencing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2157IDGQ 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 delivery solutions.

The TPS21xx family was designed specifically for space-constrained USB and portable electronics, integrating dual power switches and LDOs to replace discrete FETs, drivers, and regulators - reducing BOM count and improving thermal robustness.

FAQ

What is the maximum continuous output current per switch in the TPS2157IDGQ?

The TPS2157IDGQ supports 150 mA continuous output current per switch (OUT1 and OUT2) under recommended operating conditions. This rating assumes proper thermal management via the MSOP-10 PowerPAD and ambient temperatures ≤85°C. The device internally limits current to 200–400 mA depending on junction temperature, but sustained operation above 150 mA requires careful thermal design per the dissipation rating table.

Does the TPS2157IDGQ require external components for LDO stability?

Yes, the TPS2157IDGQ requires a minimum 4.7-µF output capacitor on LDO_OUT with ESR between 200 mΩ and 10 Ω for loop stability. Solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting this ESR range are acceptable. A 0.1-µF ceramic bypass capacitor close to LDO_OUT is also recommended to improve high-frequency noise rejection.

How does the overcurrent flag (OC1/OC2) behave during capacitor inrush?

The TPS2157IDGQ incorporates an internal transient filter that delays OC assertion by 5.5 ms and OC deassertion by 10.5 ms. This prevents false triggering from typical hot-plug inrush currents (e.g., charging 100-µF downstream caps), eliminating the need for external RC filtering. The OC pins remain low only during sustained overcurrent events exceeding the 200–400 mA limit.

Can the TPS2157IDGQ operate with input voltages below 3.0 V?

Yes - the TPS2157IDGQ operates from 2.9 V to 5.5 V on both VIN/SWIN1 and SWIN2. However, at 2.9 V input, the 3.3-V LDO cannot regulate (dropout = 0.35 V requires ≥3.65 V input), so LDO_OUT will track VIN/SWIN1 minus drop. The switches remain functional down to 2.9 V, supporting brownout-tolerant peripheral power control.

What is the thermal shutdown behavior of the TPS2157IDGQ?

The TPS2157IDGQ features dual-threshold thermal protection: a first trip at ~120°C disables only the overloaded switch (or LDO), allowing the other channel to remain operational; a second trip at ~155°C shuts down all functions. After cooling by ~10°C, the tripped channel automatically recovers - enabling self-resetting fault handling without system reset.