STMicroelectronics LD29080PT15R

Overview

LD29080PT15R from STMicroelectronics is a fixed-output 1.5 V, 800 mA low-dropout linear regulator in PPAK package, featuring 0.4 V typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It serves as a post-regulation stage in power supplies for monitors, TVs, and battery-powered systems where ultra-low dropout and stable low-voltage biasing are critical.

For engineers reviewing the LD29080PT15R datasheet, LD29080PT15R pinout, LD29080PT15R application, or LD29080PT15R equivalent, key selection criteria include guaranteed 800 mA output current, 0.4 V dropout at 800 mA, thermal/current protection, shutdown control interface, and PPAK thermal performance (R_thJC = 8 °C/W).

Technical Context

The LD29080PT15R implements a high-accuracy bandgap reference with internal error amplifier and PMOS pass transistor, enabling stable 1.5 V output across –40 °C to +125 °C. Its dropout voltage remains ≤0.7 V up to 800 mA, and it maintains 65 dB supply voltage rejection at 120 Hz under 400 mA load.

Shutdown is controlled via an inhibit pin requiring ≥2 V to enable operation; the pin draws only 5–10 µA and is not internally pulled up. Minimum 2 mA load current ensures output stability across temperature due to leakage compensation.

Key Specifications

Pinout & Package

LD29080PT15R uses the PPAK (Power Package) thermally enhanced surface-mount package (6-pin, 6.0 × 6.4 mm footprint), optimized for high-power density and low junction-to-case thermal resistance (8 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Compared with LD29080DT15R, the PT15R offers identical regulation performance but superior manufacturability in high-volume PPAK assembly; versus TLV70015DCKR, it delivers 4× higher current, integrated shutdown, and proven thermal reliability in industrial ambient conditions.

Availability

LD29080PT15R is available at Aetrix Electronics and suitable for monitor power supplies, battery-powered instrumentation, and computer peripheral designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LD29080PT15R 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The LD29080 series belongs to ST's high-accuracy, medium-current LDO portfolio, engineered specifically for post-regulation and low-noise biasing in space- and thermal-constrained systems where dropout voltage and output stability are design-critical.

FAQ

What is the minimum input voltage required for LD29080PT15R to regulate 1.5 V at 800 mA?

The minimum input voltage is determined by dropout: 1.5 V + 0.4 V = 1.9 V typical. However, the datasheet specifies a minimum operating input of 2.5 V to guarantee performance across temperature and load. Below 2.5 V, regulation may degrade or cease, especially at cold temperatures or high current.

Does LD29080PT15R require an external capacitor on the INHIBIT pin?

No external capacitor is required on the INHIBIT pin. It is a CMOS-compatible digital input with low leakage (5–10 µA). A simple pull-up resistor to VI or connection to a GPIO suffices; adding capacitance could delay turn-on/turn-off timing and is not recommended unless intentional soft-start behavior is needed.

Can LD29080PT15R be used without a minimum load current?

No. A minimum load current of 2 mA is mandatory across the full temperature range (–40 °C to +125 °C) to prevent output voltage rise caused by internal leakage currents. Omitting this load risks exceeding the 1.515 V upper limit, potentially violating downstream device absolute maximum ratings.

How does thermal performance differ between PPAK and DPAK packages for LD29080PT15R?

Both PPAK and DPAK share identical R_thJC = 8 °C/W, meaning junction-to-case heat transfer is equally efficient. However, PPAK's exposed thermal pad enables lower effective R_thJA in well-designed PCB layouts with large copper pours, whereas DPAK relies more on lead-frame conduction. For 800 mA continuous operation, PPAK typically achieves ~10–15 °C lower junction temperature under identical board conditions.