STMicroelectronics LD29080DT50R

Overview

LD29080DT50R from STMicroelectronics is a fixed-output 5.0 V, 800 mA low-dropout linear regulator in DPAK package, featuring 0.4 V typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power for post-regulation in switching supplies and battery-powered systems where ultra-low dropout and low ground current are critical.

For engineers reviewing the LD29080DT50R datasheet, LD29080DT50R pinout, LD29080DT50R application, or LD29080DT50R equivalent, key selection factors include guaranteed 800 mA output current, 0.4 V dropout at 800 mA, 5.0 V ±1% output tolerance, thermal/current protection, and DPAK thermal resistance (R_thJA = 100 °C/W).

Technical Context

The LD29080DT50R implements a high-accuracy bandgap reference with internal error amplifier and PMOS pass transistor, enabling stable regulation with minimal input–output differential. Its inhibit function requires external pull-up to >2 V for ON mode operation and supports low-quiescent-current shutdown (130–180 µA).

Designed for medium-current loads up to 800 mA, it maintains regulation across –40 °C to +125 °C ambient, with built-in thermal foldback and short-circuit current limiting (1.2 A). Output noise is 180 µV_RMS (10 Hz–100 kHz) at 100 mA load.

Key Specifications

Pinout & Package

DPAK package (TO-252-3), surface-mount, thermally enhanced with exposed drain pad. Pin 1: Input (VI); Pin 2: Ground (GND); Pin 3: Output (VO).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD29080DT50R, LD2980DT50R sacrifices output current for lower I_q, while TSM10505D trades shutdown control and thermal performance for smaller footprint - neither matches the full specification set of the LD29080DT50R in 800 mA, 5.0 V, DPAK, and inhibit-enabled applications.

Availability

LD29080DT50R is available at Aetrix Electronics and suitable for power supply post-regulation, portable medical devices, set-top box AV subsystems, and automotive infotainment core rails requiring stable component supply and long-term manufacturability.

Supply support for LD29080DT50R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LD29080 series belongs to ST's high-accuracy, medium-current LDO portfolio, engineered specifically for applications demanding ultra-low dropout, tight output tolerance, and integrated protection in space-constrained, thermally challenging environments.

FAQ

What is the minimum input voltage required for stable 5.0 V output at 800 mA?

The LD29080DT50R requires VI ≥ VO + V_DROP = 5.0 V + 0.4 V = 5.4 V minimum for full 800 mA output. At 5.4 V input, it maintains regulation; below this, output collapses. The absolute minimum operating VI is 6 V per Table 9, ensuring margin for line regulation and transient response.

Does LD29080DT50R require an external capacitor on the inhibit pin?

No external capacitor is required on the inhibit pin. The inhibit function is DC-coupled: connecting Pin 1 to a logic-high voltage >2 V enables regulation; pulling it to GND or ≤0.8 V disables output. A pull-up resistor to VI is mandatory for reliable ON-state operation, as the pin is not internally biased.

Can LD29080DT50R be used with ceramic output capacitors?

Yes - the LD29080DT50R is stable with ceramic output capacitors ≥10 µF, as confirmed in Figure 17 (stability vs. C_O) and application notes. ESR is not required; typical designs use 10–22 µF X7R ceramics with low impedance across frequency for optimal transient response and noise filtering.

Is the DPAK package of LD29080DT50R RoHS-compliant and halogen-free?

Yes - the LD29080DT50R DPAK package is ECOPACK2 compliant, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. This is documented in Section 6 (Package mechanical data) of the datasheet and verified in ST's official ECOPACK database.