Texas Instruments TPS2155IPWP

Overview

TPS2155IPWP from Texas Instruments is a dual-channel high-side power-distribution switch with integrated 3.3-V fixed-output LDO regulator, featuring two 340-mΩ (typ.) N-channel MOSFETs, independent thermal/short-circuit protection per channel, and active-high enable inputs. It delivers up to 200 mA from the LDO and 150 mA per switch, operating across 2.9 V–5.5 V input range, and is designed for USB 2.0 bus-powered hub power segmentation.

For engineers reviewing the TPS2155IPWP datasheet, TPS2155IPWP pinout, TPS2155IPWP application, or TPS2155IPWP equivalent, this device supports precise power sequencing in DSP systems, fault-isolated peripheral powering in portable electronics, and compact dual-switch + LDO integration where board space and independent overcurrent monitoring are critical.

Technical Context

The TPS2155IPWP integrates two independently controlled high-side N-channel MOSFET switches and a fixed 3.3-V LDO in a single TSSOP-14 PowerPAD package. Each switch features internal charge-pump gate drive enabling fast turn-on/turn-off (0.1–6 ms) and low inrush current, while the LDO provides regulated output with 0.35-V dropout at 200 mA.

It implements dual-threshold thermal shutdown (120°C first trip, 155°C second trip), open-drain overcurrent flags (OC1/OC2) with 5.5-ms assertion delay, and undervoltage lockout (2.2–2.85 V threshold) on both VIN/SWIN1 and SWIN2 inputs - all without external components.

Key Specifications

Pinout & Package

TSSOP-14 (PWP) package with exposed thermal pad (PowerPAD™); 5.0 mm × 4.4 mm footprint, 1.2 mm height, lead pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2155IPWP, TPS2145IPWP offers voltage flexibility at the cost of enable polarity compatibility, while TPS2157IDGQ trades thermal performance and pin count for compactness - neither is pin-compatible, but both serve overlapping power-segmentation use cases.

Availability

TPS2155IPWP is available at Aetrix Electronics and suitable for USB hub design, DSP power sequencing, and portable electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS2155IPWP 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 distribution solutions.

The TPS21xx family was engineered specifically for USB-compliant power segmentation and DSP voltage sequencing - integrating dual switches, LDOs, and intelligent protection in minimal footprint to replace multi-component discrete designs.

FAQ

What is the maximum continuous output current per switch in the TPS2155IPWP?

The TPS2155IPWP supports 150 mA continuous output current per switch (OUT1 and OUT2) under recommended operating conditions. This rating assumes proper thermal management - at 70°C ambient, the TSSOP-14 PowerPAD package sustains 517 mW total dissipation, which corresponds to ~150 mA per switch at 340 mΩ R_DS(on). Exceeding this requires verifying junction temperature using Equation (6) from the datasheet.

Does the TPS2155IPWP require external components for basic operation?

No, the TPS2155IPWP operates without external components for core functionality: the internal charge pump eliminates bootstrap capacitors, and UVLO/thermal/overcurrent protections are fully integrated. However, external capacitors are required for stability - 4.7 µF on LDO_OUT (ESR 200 mΩ–10 Ω), and 0.01–0.1 µF ceramic bypass caps on VIN/SWIN1 and SWIN2 - as specified in Section 15 of the SLVS333 datasheet.

How does the overcurrent protection behave during a short circuit on OUT1?

When a short occurs on OUT1, the TPS2155IPWP's sense FET detects rising current and transitions the MOSFET into constant-current mode at 200–400 mA (depending on temperature/voltage). OC1 asserts low after 5.5 ms, and the switch remains active - it does not latch off. If the fault persists, junction temperature rises to ~120°C, triggering per-switch thermal shutdown; recovery occurs after cooling ~10°C.

Can the TPS2155IPWP be used with a 3.3-V-only input supply?

Yes, the TPS2155IPWP operates with input voltages as low as 2.9 V, making it compatible with regulated 3.3-V supplies. At 3.3 V input, the LDO maintains 3.3-V output with 0.35-V dropout (i.e., functional down to 3.65-V input), but the switches will deliver ~3.3 V minus I×R_DS(on) drop. For full 3.3-V LDO regulation, ensure VIN/SWIN1 ≥3.65 V; otherwise, LDO output drops proportionally.

What is the purpose of the NC pins (6 and 9) on the TPS2155IPWP?

Pins 6 and 9 on the TPS2155IPWP are designated NC (No Connection) - they have no internal bond wire or circuit connection. Per TI's datasheet guidance, these pins may be left unconnected, tied to GND, or routed as unused copper; they serve no electrical function and must not be used for thermal relief or signal routing. Their presence is due to package commonality with adjustable variants (TPS2145/55).