Texas Instruments TPS2145IPWP

Overview

TPS2145IPWP from Texas Instruments is an integrated dual-channel power-distribution switch with an adjustable 1 V to 3.3 V, 200 mA LDO regulator in a single 14-pin TSSOP-PowerPAD package. It features two 340-mΩ (typical) high-side N-channel MOSFETs, independent thermal/short-circuit protection per channel, and CMOS/TTL-compatible active-low enable inputs. It is designed for USB 2.0 bus-powered hubs and portable electronics requiring compact, sequenced, and fault-protected power delivery.

For engineers reviewing the TPS2145IPWP datasheet, TPS2145IPWP pinout, TPS2145IPWP application, or TPS2145IPWP equivalent, key selection criteria include its dual-switch + adjustable-LDO integration, 2.9–5.5 V input range, 340-mΩ typical R_DS(on), independent overcurrent flag outputs (OC1/OC2), and thermal shutdown thresholds at 120°C (per switch) and 155°C (global).

Technical Context

The TPS2145IPWP integrates two independently controlled high-side N-channel MOSFET switches and an adjustable LDO on a shared die. Each switch uses internal current-sense FETs and dedicated thermal sensing to enable per-channel fault isolation - a short on OUT1 triggers OC1 and shuts down only SWIN1, leaving OUT2 operational. The LDO employs an internal 0.8 V reference and external resistor divider (LDO_ADJ) to set output from 1 V to 3.3 V with 0.35 V dropout at 200 mA.

Control logic includes active-low EN1/EN2 (pin 14/pin 13) and active-high LDO_EN (pin 10), all compatible with 3-V/5-V logic. An internal charge pump drives MOSFET gates without external components, ensuring controlled turn-on/turn-off timing (0.1–6 ms typical) and minimizing inrush surges. Undervoltage lockout (2.2–2.85 V threshold) disables both switches when VIN/SWIN1 or SWIN2 drops below specification.

Key Specifications

Pinout & Package

TPS2145IPWP is housed in a 14-pin TSSOP package with exposed PowerPAD (PWP) for enhanced thermal dissipation. The PowerPAD must be soldered to PCB ground plane for optimal thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2147IDGQ, TPS2145IPWP adds voltage adjustability and LDO enable control at the cost of two extra pins; compared with TPS2155IPWP, it retains active-low enables preferred in USB-compliant designs, simplifying interface with standard hub controllers.

Availability

TPS2145IPWP is available at Aetrix Electronics and suitable for USB hubs, portable DSP systems, and peripheral power segmentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2145IPWP 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 solutions.

The TPS2145IPWP belongs to TI's power distribution switch + LDO family, engineered specifically for space-constrained, fault-tolerant USB and portable electronics applications demanding integrated sequencing, protection, and regulation.

FAQ

What is the maximum continuous output current per switch in the TPS2145IPWP?

The TPS2145IPWP supports 150 mA continuous output current per switch (OUT1 and OUT2) under recommended operating conditions. This rating assumes proper PCB thermal design - including soldering the PowerPAD to a ground plane - and ambient temperature ≤85°C. Current limiting activates at 200–400 mA depending on junction temperature, with thermal shutdown engaging at 120°C per switch to protect against sustained overload.

How do I configure the adjustable LDO output voltage on the TPS2145IPWP?

To configure the TPS2145IPWP LDO output, connect an external resistor divider between LDO_OUT (pin 4), LDO_ADJ (pin 7), and GND (pin 8). The output voltage follows V_OUT = 0.8 V × (1 + R1/R2), where R2 is typically 200 kΩ to establish ~4 µA divider current. For example, setting R1 = 625 kΩ yields 3.3 V; R1 = 250 kΩ yields 1.8 V. A bypass capacitor (e.g., 6 pF at 1.8 V) across R1 may be needed for stability at lower voltages.

Does the TPS2145IPWP support independent fault reporting for each power switch?

Yes, the TPS2145IPWP provides independent open-drain overcurrent flags: OC1 (pin 12) reports faults on OUT1, and OC2 (pin 11) reports faults on OUT2. Each flag asserts low during overcurrent and remains latched until the fault condition clears. This enables per-channel diagnostics in multi-load systems - for instance, a USB hub can disable only the faulty port while maintaining others active - without requiring additional monitoring circuitry.

What is the purpose of the NC pins (6 and 9) on the TPS2145IPWP?

Pins 6 and 9 on the TPS2145IPWP are No Connection (NC) terminals - they have no internal bond wire or circuit connection. These pins must remain unconnected on the PCB; routing traces to or placing solder paste on them risks mechanical stress or unintended coupling. Their presence accommodates package compatibility across the TPS21xx family (e.g., TPS2147 uses different pin assignments), but they serve no functional role in the TPS2145IPWP itself.

Can the TPS2145IPWP operate with input voltages below 3.3 V?

Yes, the TPS2145IPWP operates from 2.9 V to 5.5 V on both VIN/SWIN1 and SWIN2 inputs. However, LDO regulation requires headroom: for a 3.3 V output, input must exceed 3.65 V (3.3 V + 0.35 V dropout); for 1.8 V output, minimum input is 2.15 V. Below 2.9 V, undervoltage lockout disables both switches. Thus, while the device powers on at 2.9 V, usable LDO output depends on selected V_OUT and required dropout margin.