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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LD29080PT33R

Name: LD29080PT33R
Brand: STMicroelectronics
SKU: LD29080PT33R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD29080PT33R

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Datasheet:: LD29080PT33R.pdf

Description:: IC REG LINEAR 3.3V 800MA PPAK

Quantity:: RFQ Add To RFQ list

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Inventory:1,704

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Product details

Overview

LD29080PT33R from STMicroelectronics is a fixed-output 3.3 V, 800 mA low-dropout linear regulator in PPAK (Power Package)封装, featuring 400 mV typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power for microcontroller core supplies, FPGA I/O rails, and industrial sensor interfaces where low quiescent current and high PSRR are critical.

For engineers reviewing the LD29080PT33R datasheet, LD29080PT33R pinout, LD29080PT33R application, or LD29080PT33R equivalent, key selection criteria include dropout voltage at 800 mA, thermal resistance (R_thJA = 100 °C/W), output noise (132 µV_RMS), and inhibit input compatibility with 2 V logic-high threshold.

Technical Context

The LD29080PT33R implements a PNP pass transistor architecture with internal current and thermal limiting, enabling robust operation without external protection components. Its reference voltage (1.23 V) feeds a precision error amplifier that regulates VO via feedback to the pass element, maintaining stability with ≥10 µF ceramic output capacitance.

Shutdown is controlled by an active-high INHIBIT pin requiring ≥2 V to enable regulation; no internal pull-up exists, so external biasing is mandatory for reliable ON-state operation. The device operates across –40 °C to +125 °C ambient and supports input voltages from 4.3 V to 13 V for 3.3 V output.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	3.3 V ±1% (3.267–3.333 V) at –40 to +125 °C - ensures compliance with 3.3 V digital logic supply tolerances.
Max output current	800 mA - sufficient for powering ARM Cortex-M4/M7 MCUs or dual-channel ADCs without derating at T_A ≤ 85 °C.
Dropout voltage	0.4 V typ. at 800 mA - enables regulation from 3.7 V input, critical for single-cell Li-ion or 5 V rail post-regulation.
Quiescent current	14–35 mA at 800 mA load - balances efficiency and transient response; drops to 130–180 µA in shutdown mode.
PSRR	52–67 dB at 120 Hz - suppresses ripple from upstream switching converters, reducing need for additional LC filtering.
Output noise	132 µV_RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like precision DACs or RF front-ends.
Thermal resistance	R_thJA = 100 °C/W (PPAK) - requires ≤25 °C ambient rise at 800 mA in standard PCB layout with 2 oz copper pour.

Pinout & Package

LD29080PT33R uses the PPAK (Power Package) surface-mount package: 5-pin, exposed thermal pad, dimensions 6.0 × 6.4 × 2.4 mm (L × W × H), RoHS-compliant and ECOPACK® certified.

Pin/Terminal	Circuit Role	Design Meaning
1 - VI	Input voltage supply	Accepts 4.3–13 V DC; must be decoupled with ≥330 nF ceramic capacitor close to pin.
2 - GND	Ground reference	Common return for input/output/INHIBIT; connects to thermal pad for optimal heat dissipation.
3 - VO	Regulated output	Delivers 3.3 V ±1%; requires ≥10 µF low-ESR ceramic output capacitor for stability.
4 - NC	No connection	Not internally bonded; left floating - not used in fixed-output version LD29080PT33R.
5 - INHIBIT	Enable control input	Active-high logic input; tie to ≥2 V (e.g., 3.3 V rail) to enable regulation; connect to GND for shutdown.

Key Features

Feature	Design Value
Ultra-low dropout	0.4 V typ. at 800 mA enables operation with minimal headroom - extends battery runtime in portable systems.
High accuracy output	±1% over –40 to +125 °C eliminates need for external trimming in automotive and industrial applications.
Logic-controlled shutdown	INHIBIT pin draws only 5–10 µA at 13 V - allows direct interfacing with GPIOs without level-shifting.
Integrated protection	Internal current limit (1.2 A) and thermal shutdown prevent damage during overload or poor heatsinking.
Low-noise regulation	132 µV_RMS output noise meets requirements for mixed-signal SoCs and high-resolution data acquisition.

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering isolated CAN transceiver and microcontroller I/O banks in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU GPIOs and CAN PHY interface; provides clean, regulated rail independent of 12 V battery fluctuations.

Use Value: 67 dB PSRR rejects alternator ripple; 0.4 V dropout ensures regulation during cold-crank (6.5 V battery).

Use Scenario: Supplying door module microcontrollers and LIN transceivers in 12 V vehicle architectures.

IC Role / Device Role / Timing Role: Fixed 3.3 V regulator for MCU core and peripheral logic; INHIBIT pin synchronized with vehicle ignition state.

Use Value: Shutdown current <180 µA minimizes parasitic drain; –40 to +125 °C rating meets AEC-Q100 Grade 2 requirements.

Medical Patient Monitor Sensor Interface

Industrial IoT Edge Node

Use Scenario: Biasing low-noise instrumentation amplifiers and 24-bit sigma-delta ADCs in bedside vital sign monitors.

IC Role / Device Role / Timing Role: Low-noise 3.3 V supply for analog signal chain; placed adjacent to ADC to minimize ground loop interference.

Use Value: 132 µV_RMS output noise avoids degrading ENOB; ±1% accuracy maintains calibration integrity over temperature.

Use Scenario: Powering LoRaWAN node MCU, RF transceiver, and environmental sensors in remote wireless gateways.

IC Role / Device Role / Timing Role: Main system regulator converting 5 V USB or PoE-derived supply to 3.3 V for ultra-low-power operation.

Use Value: 14 mA quiescent current at 800 mA load optimizes efficiency in burst-transmit duty cycles; PPAK package enables compact 2-layer PCB design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM108033DCQ	Fixed 3.3 V, 800 mA, R_thJA = 90 °C/W (D2PAK), dropout = 0.35 V typ. at 800 mA	Higher thermal performance but larger D2PAK footprint; no INHIBIT pin - requires external enable circuitry	Select when board space allows larger package and shutdown control is implemented externally.
MCP1703T-3302E/MB	Fixed 3.3 V, 250 mA, SOT-23-5, dropout = 0.6 V at 250 mA, I_q = 4 µA	Lower current capability and higher dropout; ultra-low quiescent current ideal for always-on battery nodes	Select only for sub-250 mA loads where micropower (<5 µA) dominates over dropout and thermal performance.

Compared with TSM108033DCQ and MCP1703T-3302E/MB, LD29080PT33R uniquely balances 800 mA delivery, 0.4 V dropout, integrated shutdown, and PPAK thermal efficiency - making it optimal for space-constrained industrial and automotive modules requiring full-load capability without external enable logic.

Availability

LD29080PT33R is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical sensor interfaces, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD29080PT33R 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 power management applications.

LD29080PT33R belongs to ST's high-accuracy, medium-current LDO family engineered for post-regulation in noise-sensitive and thermally constrained systems - emphasizing low dropout, tight tolerance, and robust protection without external components.

FAQ

What is the minimum input voltage required for LD29080PT33R to maintain regulation at 800 mA?

The minimum input voltage is calculated as VO + VDROP = 3.3 V + 0.4 V = 3.7 V. However, per Table 8, the specified operating input range starts at 4.3 V for guaranteed 3.3 V output across –40 to +125 °C. Below 4.3 V, regulation may degrade outside temperature extremes or load conditions.

Can LD29080PT33R be used without the INHIBIT pin connected?

No. The INHIBIT pin has no internal pull-up; leaving it floating risks undefined operation. To ensure reliable enable, it must be tied to a valid logic-high voltage ≥2 V (e.g., 3.3 V rail). For permanent enable, connect directly to VI through a 10 kΩ resistor to limit fault current.

What output capacitor value and type are required for stability?

A minimum 10 µF ceramic capacitor with X5R/X7R dielectric and ≤100 mΩ ESR is required at the VO pin. ST recommends 22 µF for improved transient response. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR and reliability concerns.

Is LD29080PT33R pin-compatible with other variants in the LD29080 series?

Yes - all LD29080 fixed-output versions (e.g., LD29080PT15R, LD29080PT50R) share identical PPAK-5 pinout and footprint. Only the output voltage differs; no changes to VI, GND, VO, or INHIBIT connections are needed when substituting across the series.

LD29080PT33R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 13V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.7V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 180 µA

Current - Supply (Max):: 35 mA

PSRR:: 67dB (120Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LD29080PT33R FAQ

1.How can I place an order for LD29080PT33R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD29080PT33R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LD29080PT33R reliable?

The price and inventory of LD29080PT33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29080PT33R is usually 5 days.

3.What payment methods are accepted for LD29080PT33R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29080PT33R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD29080PT33R?

LD29080PT33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD29080PT33R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LD29080PT33R?

For technical support, including LD29080PT33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29080PT33R requirements.

6.How does Aetrix verify that LD29080PT33R is sourced from the original manufacturer or authorized distributors?

All LD29080PT33R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD29080PT33R meets industry standards.

7.What is the process for return or replacement of LD29080PT33R?

All LD29080PT33R units undergo pre-shipment inspection (PSI). If there is an issue with LD29080PT33R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LD29080PT33R part is unused and in its original packaging.

Return procedure for LD29080PT33R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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