Texas Instruments TPS76515DRG4

Overview

TPS76515DRG4 from Texas Instruments is a 1.5-V fixed-output, 150-mA ultra-low-quiescent-current LDO voltage regulator using a PMOS pass element. It delivers 1.5 V ±3% over –40°C to 125°C at up to 150 mA load, with 85 mV typical dropout at 150 mA (TPS76550 variant), 35 µA typical ground current, and open-drain power-good output - ideal for battery-powered microcontroller and sensor supply rails.

For engineers reviewing the TPS76515DRG4 datasheet, TPS76515DRG4 pinout, TPS76515DRG4 application, or TPS76515DRG4 equivalent, key selection criteria include its 35-µA quiescent current across full load range, SOIC-8 package compatibility, thermal shutdown protection, enable-controlled sleep mode (<1 µA standby), and stability with 4.7-µF output capacitor.

Technical Context

The TPS76515DRG4 employs a PMOS pass transistor architecture, enabling voltage-driven gate control that decouples quiescent current from load - maintaining ~35 µA from 0 to 150 mA. Its dropout voltage scales linearly with output current due to low on-resistance channel behavior, unlike bipolar-based LDOs.

It integrates an internal 1.224-V reference, precision error amplifier, open-drain PG comparator with 92–98% VO trip threshold and 0.5% hysteresis, and thermal shutdown triggered at 150°C. The EN pin accepts TTL-compatible logic (VIH ≥ 2.0 V, VIL ≤ 0.8 V) for fast 160-µs turn-on.

Key Specifications

Pinout & Package

TPS76515DRG4 is housed in an 8-pin SOIC (D) package with exposed pad not present; footprint matches JEDEC MS-012AC. Pin functions are validated per TI SLVS236 datasheet Section "Terminal Functions – SOIC Package".

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76515D and MCP1700T-1502E/TT, the TPS76515DRG4 uniquely combines PG monitoring, 125°C operation, and proven stability with 4.7-µF capacitors - making it optimal for safety-critical or thermally demanding embedded deployments.

Availability

TPS76515DRG4 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and energy-harvesting systems requiring stable component supply with long-term manufacturability and RoHS compliance.

Supply support for TPS76515DRG4 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 connectivity technologies with decades of LDO design heritage.

The TPS765xx family was engineered for ultra-low-power battery-operated systems needing precise, stable, and supervisor-capable voltage regulation - particularly in space-constrained industrial and medical edge devices.

FAQ

What is the minimum input voltage required for TPS76515DRG4 to regulate at 150 mA?

The TPS76515DRG4 requires a minimum input voltage of 2.7 V per datasheet Section "Recommended Operating Conditions". Since its nominal output is 1.5 V, this implies a practical dropout headroom of 1.2 V at full load - consistent with the family's PMOS architecture and confirmed by TPS76528 (2.8-V version) dropout of 190 mV at 150 mA. Always verify actual dropout under your specific thermal and layout conditions.

Does TPS76515DRG4 require an external resistor divider for 1.5-V operation?

No. The TPS76515DRG4 is a fixed-output variant; its 1.5-V regulation is achieved internally. Pin 1 (NC/FB) is unconnected and must be left floating - no external resistors are needed. Only the adjustable TPS76501 requires an R1/R2 divider network on the FB pin.

Can TPS76515DRG4 be used with ceramic output capacitors?

Yes - the TPS76515DRG4 is stable with ceramic capacitors provided they meet the 4.7 µF minimum capacitance and 300 mΩ to 20 Ω ESR range. Datasheet Figure 25 confirms stability with added ceramic capacitance, and application note SLVS236 explicitly lists multilayer ceramic as suitable when ESR constraints are satisfied.

What is the purpose of the dual IN and OUT pins on TPS76515DRG4?

The dual IN (pins 5 & 6) and dual OUT (pins 7 & 8) reduce effective trace resistance and inductance, improving transient response and current sharing. This layout minimizes voltage drop and noise coupling during load steps - critical for noise-sensitive analog circuits powered by the TPS76515DRG4.

How does the power-good (PG) output behave during startup and dropout?

The PG output of the TPS76515DRG4 goes high only when VO reaches ≥92% of 1.5 V (≥1.38 V) and remains high until VO falls below 92% (hysteresis ensures clean release at ~1.373 V). During startup, PG asserts after output settles; during input brownout, PG deasserts before regulation loss - providing early warning for controlled shutdown in systems using the TPS76515DRG4.