Texas Instruments TPS77501D

Overview

TPS77501D from Texas Instruments is an adjustable 500mA low-dropout (LDO) voltage regulator with open-drain RESET output, 1.5V–5.5V output range, 169mV typical dropout at 500mA, and 85µA typical quiescent current. It operates across –40°C to +125°C and is used in FPGA core power, DSP I/O rails, and battery-powered embedded systems requiring precise, low-noise regulation.

For engineers reviewing the TPS77501D datasheet, TPS77501D pinout, TPS77501D application, or TPS77501D equivalent, key selection considerations include its adjustable output architecture, 200ms RESET delay, PMOS pass element enabling load-independent quiescent current, and SOIC-8 package compatibility with space-constrained industrial control and portable instrumentation designs.

Technical Context

The TPS77501D implements a PMOS-based LDO architecture with internal 1.183V reference, feedback-controlled loop via FB pin, and dedicated open-drain RESET comparator monitoring VOUT against 92–98% trip threshold. Its fast transient response is enabled by stability with 10µF low-ESR output capacitors (50mΩ–1.5Ω).

It features TTL-compatible enable input (VEN(HI) = 1.7V), thermal shutdown at 150°C, current limiting at ~1.7A, and reverse-current protection via integrated back diode. The RESET function asserts low after 200ms timeout when VOUT falls below nominal threshold-no external timing components required.

Key Specifications

Pinout & Package

TPS77501D is housed in an 8-pin SOIC (D) package with exposed pad not present; thermal performance relies on standard PCB copper area per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and LP3878MRX-ADJ, the TPS77501D uniquely balances 500mA output, 85µA IQ, SOIC-8 manufacturability, and integrated RESET-making it optimal for mid-power embedded systems where integration, efficiency, and reset reliability are jointly prioritized.

Availability

TPS77501D is available at Aetrix Electronics and suitable for FPGA power, DSP I/O rails, and battery-powered instrumentation requiring stable component supply with long-term industrial lifecycle support.

Supply support for TPS77501D 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 LDO design heritage and automotive-grade process validation.

The TPS775xx family was engineered for high-reliability embedded systems needing adjustable, low-IQ regulation with integrated power-monitoring functions-targeting industrial automation, test equipment, and portable medical devices.

FAQ

What is the output voltage range of the TPS77501D?

The TPS77501D is an adjustable LDO regulator with an output voltage range of 1.5V to 5.5V, set externally via a resistor divider connected to the FB pin. Its internal 1.183V reference enables precise programming using Equation VOUT = 1.183V × (1 + R1/R2). This flexibility allows the TPS77501D to replace multiple fixed-output regulators in multi-rail systems while maintaining ±2% accuracy across temperature and load.

Does the TPS77501D require a minimum load current to maintain regulation?

No, the TPS77501D is stable at zero load and does not require a minimum load current. Its PMOS pass element and internal compensation ensure loop stability even with no output current, eliminating the need for dummy loads in standby or sleep modes. This behavior is confirmed in the datasheet's Application Information section and makes the TPS77501D ideal for intermittent-duty applications like sensor nodes or wake-on-event systems.

How does the RESET function of the TPS77501D operate?

The TPS77501D's RESET output is an open-drain signal that goes low when the regulated output voltage drops to 92–98% of its nominal value, with a fixed 200ms internal timeout. It requires an external pull-up resistor to a valid logic voltage (e.g., VOUT or another rail). RESET remains asserted until VOUT recovers above the hysteresis threshold (~0.5% above trip point), providing robust undervoltage detection without external comparators or timers-key for reliable microcontroller reset in the TPS77501D-based designs.

What package type and thermal characteristics apply to the TPS77501D?

The TPS77501D is offered exclusively in the 8-pin SOIC (D) package (JEDEC MS-012), with no exposed thermal pad. Its thermal resistance θJA is 250°C/W (no airflow) per the Dissipation Ratings table. For reliable operation at full 500mA load, PCB layout must provide adequate copper area on the GND pins and minimize trace resistance; derating is required above +70°C ambient to stay within the 125°C max junction temperature limit.

Can the TPS77501D be used with ceramic output capacitors?

Yes, the TPS77501D is compatible with ceramic output capacitors, provided they meet the 10µF minimum capacitance and 50mΩ–1.5Ω ESR requirements specified in the datasheet. Multilayer ceramic capacitors (MLCCs) with X5R/X7R dielectrics are commonly used; however, DC bias derating must be considered to ensure effective capacitance remains ≥10µF at the applied VOUT. This capability simplifies filtering and reduces board area versus tantalum or aluminum electrolytic alternatives in the TPS77501D application.