Texas Instruments TPS7A2137PYWDJ

Overview

TPS7A2137PYWDJ from Texas Instruments is a 500-mA, low-noise, ultra-low-I_Q (6.5 μA), high-PSRR (91 dB @ 1 kHz) LDO voltage regulator in a 0.602-mm × 0.602-mm DSBGA package, delivering 3.7 V output with ±1.5% tolerance over line, load, and temperature - designed for RF power supply rails in battery-constrained portable systems.

For engineers reviewing the TPS7A2137PYWDJ datasheet, TPS7A2137PYWDJ pinout, TPS7A2137PYWDJ application, or TPS7A2137PYWDJ equivalent, key selection criteria include its 175-mV dropout at 500 mA (2.5-V_OUT), 7.7 μV_RMS output noise without external bypass capacitor, smart EN pulldown (440-kΩ internal resistor), and stable operation with 1–200-μF ceramic output capacitors.

Technical Context

The TPS7A2137PYWDJ employs a CMOS pass transistor architecture with integrated low-pass RC filtering on the reference path to achieve 7.7 μV_RMS noise without external components. Its smart enable circuit disconnects the 440-kΩ internal pulldown when EN > 0.9 V, reducing leakage and eliminating need for external pull-down resistors.

It features active output discharge via a 150-Ω internal pulldown when disabled, foldback current limiting (ICL = 740–1500 mA, ISC = 325 mA), and UVLO with 50-mV hysteresis (thresholds 1.05–1.63 V). Thermal shutdown activates at 165°C with 25°C hysteresis.

Key Specifications

Pinout & Package

TPS7A2137PYWDJ uses a 4-pin, 0.602-mm × 0.602-mm DSBGA (YWD) package with bottom-side ball layout. The ultra-small footprint supports high-density portable PCB designs and enables placement directly under processors or RF modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A2137PYWDJ, TPS7A2037PDQNR offers smaller footprint but sacrifices PSRR and noise performance, while MCP1826T-3702E/DB provides through-hole-compatible packaging and lower unit cost at the expense of quiescent current, transient response, and advanced safety features like active discharge.

Availability

TPS7A2137PYWDJ is available at Aetrix Electronics and suitable for mobile RF power supplies, wearable sensor nodes, IP camera image signal chains, and portable medical front-ends requiring stable component supply across production lifecycles.

Supply support for TPS7A2137PYWDJ 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, high-performance power solutions.

The TPS7A21 family was engineered specifically for noise-sensitive RF and analog subsystems in space-constrained portable electronics, emphasizing ultra-low I_Q, high PSRR, and minimal external component count.

FAQ

What is the exact output voltage of the TPS7A2137PYWDJ?

The TPS7A2137PYWDJ is a fixed-output LDO delivering 3.7 V nominal voltage. Its output voltage tolerance is ±1.5% over line, load, and temperature conditions, meaning the actual output remains within 3.645 V to 3.755 V across all specified operating ranges. This tight accuracy eliminates need for external feedback trimming in precision applications.

Does the TPS7A2137PYWDJ require an external noise bypass capacitor?

No, the TPS7A2137PYWDJ does not require an external noise bypass capacitor. Its internal low-pass RC filter on the reference path achieves 7.7 μV_RMS output noise (10 Hz–100 kHz) inherently. This design reduces BOM count, saves PCB area, and simplifies layout - especially valuable in ultra-compact wearable and mobile designs where every mm² matters.

What is the dropout voltage specification for the TPS7A2137PYWDJ at full load?

At 500 mA output current and 2.5-V output, the TPS7A2137PYWDJ has a maximum dropout voltage of 175 mV. For its specific 3.7-V output, the datasheet specifies dropout voltages by output voltage range: 1.5 V ≤ V_OUT < 2.5 V → 260 mV max; 2.5 V ≤ V_OUT ≤ 5.5 V → 175 mV max. Thus, TPS7A2137PYWDJ maintains regulation down to VIN = 3.875 V at full load.

How does the smart enable function work on the TPS7A2137PYWDJ?

The TPS7A2137PYWDJ's smart enable (EN) pin features an internal 440-kΩ pulldown resistor that holds the regulator disabled when EN is floating or unconnected. When EN voltage exceeds 0.9 V (V_EN(HI)), the pulldown is disconnected to minimize leakage. This eliminates need for external pull-down resistors and ensures robust startup behavior even when driven by weak GPIO sources.

Can the TPS7A2137PYWDJ safely drive large output capacitance during startup?

Yes - the TPS7A2137PYWDJ includes an internal soft-start circuit that controls inrush current, minimizing input voltage drop during startup. It is stable with output capacitance from 1 μF to 200 μF, including high-value ceramics used for transient suppression. However, for C_OUT > 100 μF, verify input source current capability to avoid violating absolute max ratings during initial charge.