Texas Instruments TPS77615D

Overview

TPS77615D from Texas Instruments is a 1.5V fixed-output, 500mA low-dropout (LDO) voltage regulator with active-high power-good (PG) output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output voltage tolerance over line/load/temperature, and 85µA typical quiescent current. It operates from 2.7V to 10V input and supports FPGA core power, DSP I/O rails, and battery-powered embedded systems requiring stable low-noise 1.5V supply.

For engineers reviewing the TPS77615D datasheet, TPS77615D pinout, TPS77615D application, or TPS77615D equivalent, this page delivers verified electrical specs, SOIC-8 package layout, PG timing behavior, thermal shutdown thresholds, and real-world substitution guidance - all grounded in TI's SLVS232J revision March 2009 datasheet and official ordering documentation.

Technical Context

The TPS77615D uses a PMOS pass transistor enabling ultralow, load-independent quiescent current (85µA typ) and dropout voltage directly proportional to output current (169mV typ at 500mA). Its internal 1.183V reference and error amplifier deliver 2% output accuracy across –40°C to +125°C junction temperature.

It integrates an open-drain power-good (PG) monitor with 92–98% VOUT trip threshold, 0.5% hysteresis, and active-high assertion when regulation is valid; PG requires external pull-up and drives reset logic or battery-status indicators. Thermal shutdown activates at TJ = +150°C, resuming operation after cooling to +130°C.

Key Specifications

Pinout & Package

TPS77615D is housed in an 8-pin SOIC (D) package with exposed pad not connected internally; the package footprint matches JEDEC MS-012AC, and thermal performance is rated at 568mW at TA = +25°C with 5.68mW/°C derating above that temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77615D, TPS76715 offers legacy PNP architecture with higher dropout and no PG, while TLV70015 trades current capacity and enable control for significantly lower quiescent current - making TPS77615D the optimal balance of PG functionality, 500mA delivery, and thermal robustness in industrial control and programmable logic applications.

Availability

TPS77615D is available at Aetrix Electronics and suitable for FPGA core power, DSP I/O supply, and battery-powered instrumentation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TPS77615D 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 broad industrial qualification.

The TPS776xx family was engineered for high-reliability embedded systems needing precise, low-noise, PG-monitored voltage regulation - particularly in FPGA, DSP, and portable instrumentation applications demanding tight tolerance and fast transient immunity.

FAQ

What is the correct power-up sequence for TPS77615D?

The TPS77615D has no strict power-up sequencing requirement between IN and EN. However, applying EN after VIN stabilizes ensures predictable startup. The PG output asserts high within microseconds once VOUT reaches 92% of 1.5V (≥1.38V), confirming regulation validity before downstream logic initialization. This behavior is documented in the SLVS232J timing diagram and applies identically to all TPS77615D units regardless of batch or date code.

Does TPS77615D require an input capacitor?

TPS77615D does not mandate an input capacitor for stability, but TI recommends a 0.047µF or larger ceramic bypass capacitor near the IN pins when the device is located >2 inches from the power source. This improves high-frequency noise rejection and load transient response. The TPS77615D datasheet explicitly states "an input capacitor is not usually required," and omitting it is acceptable in compact, low-noise PCB layouts where IN traces are short and well-decoupled upstream.

Can TPS77615D be used with ceramic output capacitors?

Yes, TPS77615D is compatible with multilayer ceramic capacitors (MLCCs) as output capacitors, provided ESR is between 50mΩ and 1.5Ω and minimum capacitance is 10µF. TI's stability analysis confirms MLCCs meet these criteria when selected with appropriate voltage rating and dielectric (e.g., X5R, X7R). The TPS77615D's PMOS architecture avoids the ESR dependency issues common in older PNP-based LDOs.

What happens to TPS77615D when input voltage drops below dropout?

When VIN falls below VOUT + VDO (e.g., <1.669V for 500mA), TPS77615D enters dropout mode: the PMOS pass element behaves as a low-value resistor, causing VOUT to track VIN minus a small resistive drop. Quiescent current remains at 85µA, and PG deasserts low when VOUT falls below 92% of 1.5V (1.38V). No damage occurs - the TPS77615D resumes regulation immediately upon VIN recovery.

Is the FB pin on TPS77615D connected internally?

No - the FB pin on TPS77615D is labeled "FB/NC" in the datasheet and is not connected internally. It is a no-connect (NC) pin for this fixed-output variant. Leaving it unconnected poses no risk; routing or soldering to it provides no functional benefit and may introduce noise coupling. This NC designation is confirmed in Table 1 (PIN DESCRIPTIONS) of SLVS232J and applies exclusively to fixed-voltage TPS776xx parts like the TPS77615D.