Texas Instruments TPS2158IDGNR

Overview

TPS2158IDGNR from Texas Instruments is a USB bus-powered peripheral power management IC integrating a 3.3-V/200-mA fixed-output LDO, two independent high-side N-channel MOSFET power switches (each rated for 150 mA continuous), and independent thermal/short-circuit protection. It operates from 2.9 V to 5.5 V input, features active-high enables (EN1, EN2, LDO_EN), and is packaged in an 8-pin MSOP-PowerPAD™ for compact USB peripheral designs such as digital cameras and headsets.

For engineers reviewing the TPS2158IDGNR datasheet, TPS2158IDGNR pinout, TPS2158IDGNR application, or TPS2158IDGNR equivalent, key selection criteria include its dual-switch + LDO integration, 340-mΩ typical R_DS(on), independent enable logic compatibility with 3-V/5-V systems, and thermal fault isolation capability per switch - all critical for USB 2.0-compliant bus-powered peripheral power sequencing and current limiting.

Technical Context

The TPS2158IDGNR implements three independent regulated power paths: one 3.3-V LDO (200 mA, 0.35-V dropout) fed from VIN/SWIN1, and two high-side N-MOSFET switches (OUT1 and OUT2) each with 340-mΩ typical on-resistance and independent enable inputs. Each switch includes dedicated current-sense FETs and thermal shutdown thresholds (120°C first trip, 155°C second trip), enabling fault containment without cross-switch disruption.

Its control architecture uses active-high CMOS/TTL-compatible enables (EN1, EN2, LDO_EN), undervoltage lockout (2.2–2.85 V threshold with 260-mV hysteresis), and controlled rise/fall times (0.1–6 ms depending on load) to suppress inrush current and EMI - essential for meeting USB enumeration current limits (<100 mA at power-up) and hot-plug robustness.

Key Specifications

Pinout & Package

The TPS2158IDGNR is housed in an 8-pin MSOP-PowerPAD™ (DGN) package with exposed thermal pad for enhanced heat dissipation. Pin 1 is OUT1; pin numbering follows standard MSOP top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2148IDGNR, the TPS2158IDGNR eliminates level-shifting overhead via active-high enables; compared with TPS2159IDGNR, it integrates the essential USB 3.3-V LDO, reducing BOM count and layout complexity for bus-powered peripherals.

Availability

TPS2158IDGNR is available at Aetrix Electronics and suitable for USB peripheral designs, digital camera power sequencing, and bus-powered audio device development requiring stable component supply, RoHS-compliant packaging, and production-ready thermal performance.

Supply support for TPS2158IDGNR 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 technologies, with leadership in USB interface and power solutions.

The TPS21xx family was designed specifically for USB bus-powered peripheral power management, integrating LDO regulation, dual high-side switching, and fault protection in minimal footprint to meet USB 2.0 enumeration and thermal requirements.

FAQ

What is the maximum continuous output current supported by each switch in the TPS2158IDGNR?

The TPS2158IDGNR supports 150 mA of continuous output current per switch (OUT1 and OUT2) under recommended operating conditions (T_J ≤ 100°C). This rating ensures reliable operation within USB low-power function limits and accounts for thermal derating in the MSOP-8 PowerPAD™ package. The device also provides 200–400 mA short-circuit current limiting to protect against transient overloads without immediate shutdown.

Does the TPS2158IDGNR include an integrated LDO, and what are its key specifications?

Yes, the TPS2158IDGNR integrates a fixed 3.3-V LDO delivering up to 200 mA continuous output current with a typical dropout voltage of 0.35 V at 200 mA. Its output voltage is tightly regulated at 3.3 V ±3%, exhibits ≥50 dB PSRR at 1 kHz, and features active-high LDO_EN control. The LDO_OUT pin also serves as the source for the second high-side switch (OUT2), enabling efficient 3.3-V rail distribution.

How does thermal protection work in the TPS2158IDGNR, and is it per-switch or global?

The TPS2158IDGNR implements dual-threshold thermal protection: a first trip at ~120°C disables only the overheating switch (OUT1 or OUT2) while leaving the LDO and other switch operational; a second global trip at 155°C shuts down all functions. Hysteresis of ~10°C allows automatic recovery after cooling. This per-switch isolation prevents single-point faults from disrupting USB communication or auxiliary power paths.

What is the purpose of the undervoltage lockout (UVLO) feature in the TPS2158IDGNR?

The UVLO in the TPS2158IDGNR prevents erroneous operation during power-up, brownout, or hot-plug events by holding all outputs disabled until VIN/SWIN1 rises above 2.2–2.85 V. With 260-mV hysteresis and 50-µs deglitching, it rejects noise-induced false triggers and ensures clean, monotonic power sequencing - critical for USB compliance where premature enablement could violate <100 mA startup current limits.

Can the TPS2158IDGNR be used in applications requiring independent control of 3.3-V and 5-V rails from a single USB VBUS input?

Yes, the TPS2158IDGNR is explicitly designed for this use case: its integrated 3.3-V LDO (LDO_OUT) powers USB controllers and logic, while OUT1 (switched 5-V) and OUT2 (switched 3.3-V) provide independently enabled rails. EN1 and EN2 allow precise sequencing - e.g., enabling LDO_OUT first for enumeration, then OUT2 for 3.3-V peripherals, and finally OUT1 for 5-V loads - all from a single 5-V USB input.