Texas Instruments TPS77601D

Overview

TPS77601D from Texas Instruments is an adjustable 500mA low-dropout (LDO) voltage regulator with power-good (PG) output, PMOS pass element, 1.2V–5.5V output range, ±2% output accuracy over line/load/temperature, and 85µA typical quiescent current. It delivers stable core/I/O rail regulation for FPGA, DSP, and portable embedded systems requiring fast transient response and low-power operation.

For engineers reviewing the TPS77601D datasheet, TPS77601D pinout, TPS77601D application, or TPS77601D equivalent, key selection criteria include dropout voltage at 500mA (169mV typ), PG output threshold (92–98% VOUT), thermal shutdown (150°C), SOIC-8 package compatibility, and support for 10µF low-ESR output capacitors.

Technical Context

The TPS77601D uses a voltage-driven PMOS pass transistor to achieve ultralow, load-independent quiescent current (85µA typ) and linear dropout behavior-dropout voltage scales directly with output current (169mV at 500mA). Its internal 1.183V reference feeds a high-impedance feedback amplifier, enabling precise output programming via external resistor divider on FB pin.

It integrates an open-drain power-good (PG) monitor with 200ms delay, hysteresis (0.5% VOUT), and trip threshold at 92–98% of nominal output. The EN pin provides TTL-compatible shutdown (ISTBY = 1µA), and thermal protection disables regulation above 150°C junction temperature.

Key Specifications

Pinout & Package

TPS77601D is packaged in an 8-pin SOIC (D) with exposed pad not connected internally; GND pins (1, 2) provide low-impedance return paths, and IN/OUT pins are duplicated for current sharing and reduced trace inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77601D, TPS767D318 offers dual outputs but omits PG functionality and increases quiescent current, while MCP1826T-ADJE/DC reduces size and cost at the expense of thermal robustness and system-level power monitoring capability.

Availability

TPS77601D is available at Aetrix Electronics and suitable for FPGA power management, DSP I/O regulation, portable medical sensors, industrial PLC modules, and battery-backed data loggers requiring stable component supply and long-term lifecycle support.

Supply support for TPS77601D 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 regulation solutions.

The TPS776xx family was designed specifically for high-performance, low-quiescent-current LDO applications in portable, battery-operated, and thermally constrained systems demanding precision output regulation and integrated power-status signaling.

FAQ

What is the minimum input voltage required for TPS77601D to regulate a 1.2V output?

The minimum input voltage for TPS77601D is determined by dropout voltage plus output voltage. At 500mA, typical dropout is 169mV, so minimum VIN = 1.2V + 0.169V = 1.369V. Per datasheet Section 6.5, absolute minimum VIN is also bounded at 2.7V for VOUT < 2.8V - however, this applies only to fixed-output variants. Since TPS77601D is adjustable and specified for 1.2V–5.5V output, the 2.7V floor does not apply; regulation begins at 1.369V. Always verify stability with 10µF output capacitor.

Does TPS77601D require a minimum load current to maintain regulation?

No, TPS77601D is stable at zero load. The datasheet explicitly states "The TPS775xx and TPS776xx families are stable at zero load; no minimum load is required for operation." This is enabled by its PMOS pass element and internal compensation optimized for 10µF output capacitance. Unlike older PNP-based LDOs, it avoids instability or oscillation when sourcing no current.

How is the power-good (PG) output of TPS77601D configured and used in a system?

The PG pin (Pin 8) is an open-drain output that pulls low when VOUT falls below 92–98% of its nominal value, with 200ms delay and 0.5% hysteresis. It requires an external pullup resistor (typically 10kΩ to VIN or logic rail) to generate an active-high signal. In practice, this signal drives microcontroller reset inputs or FPGA configuration enable lines, ensuring peripherals activate only after stable regulation is confirmed.

Can TPS77601D be used with ceramic output capacitors, and what ESR range is acceptable?

Yes, TPS77601D is compatible with multilayer ceramic capacitors (MLCCs) as long as their equivalent series resistance (ESR) falls within 50mΩ to 1.5Ω. The datasheet confirms stability with 10µF low-ESR capacitors - MLCCs typically exhibit ESR < 10mΩ, which lies below the 50mΩ lower bound. To meet the minimum ESR requirement, add a small series resistor (e.g., 50–100mΩ) or select a hybrid capacitor with controlled ESR. Avoid using MLCCs alone without ESR boosting in high-stability applications.

What thermal considerations apply when operating TPS77601D in SOIC-8 package at 500mA?

In SOIC-8 (D package), TPS77601D has RθJA = 9.04°C/W (with 250 CFM airflow) per the Dissipation Ratings Table. At 500mA and VIN = 5.5V, VOUT = 1.2V, power dissipation PD ≈ (5.5V − 1.2V) × 0.5A = 2.15W. Junction temperature rise ΔTJ = 2.15W × 9.04°C/W ≈ 19.4°C. With TA = 85°C, TJ ≈ 104.4°C - within the –40°C to +125°C operating range. For continuous 500mA operation at high ambient, use PCB copper pour under the exposed pad (though unconnected) to enhance convection cooling.