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

STMicroelectronics LD39030ADTPU12R

Name: LD39030ADTPU12R
Brand: STMicroelectronics
SKU: LD39030ADTPU12R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39030ADTPU12R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39030ADTPU12R.pdf

Description:: IC REG LINEAR 1.2V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,475

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Product details

Overview

LD39030ADTPU12R from STMicroelectronics is a 300 mA ultra-low-dropout linear voltage regulator with 1.2 V fixed output, ±0.5 % accuracy at 25 °C, 300 mV typical dropout at 300 mA, and 20 µA typical quiescent current. It operates from 1.5 V to 5.5 V input, features logic-controlled enable, internal soft-start, and optional output discharge-designed for precision power rails in battery-powered imaging and mobile SoC subsystems.

For engineers reviewing the LD39030ADTPU12R datasheet, LD39030ADTPU12R pinout, LD39030ADTPU12R application, or LD39030ADTPU12R equivalent, key selection criteria include output accuracy tolerance, shutdown current (<0.1 µA), PSRR (80 dB @ 1 kHz), ceramic capacitor compatibility (≥0.47 µF), and DFN4 1×1 thermal performance under -40 °C to 125 °C ambient conditions.

Technical Context

The LD39030ADTPU12R implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 1 kHz–100 kHz. Its internal soft-start circuit limits inrush current without external components, while the integrated output discharge MOSFET (enabled in ADT variants) actively pulls VOUT to GND during shutdown.

Stabilized with ≥0.47 µF ceramic output capacitance, it maintains loop stability over full temperature (-40 °C to 125 °C) and load (0–300 mA) ranges. The EN pin accepts TTL/CMOS-compatible logic levels (V_IL ≤ 0.4 V, V_IH ≥ 1 V) and triggers <0.1 µA standby mode when pulled low.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2 V with ±0.5 % accuracy at 25 °C - enables stable core supply for low-voltage processors and sensors.
Max Output Current	300 mA guaranteed - supports multi-rail SoC subsystems including image signal processors and RF transceivers.
Dropout Voltage	330 mV max at 300 mA and -40 °C to 125 °C - allows operation from single-cell Li-ion (3.0 V min) down to 1.5 V input.
Quiescent Current	20 µA typ. at no load - extends battery life in always-on sensor nodes and standby modes.
PSRR	80 dB @ 1 kHz, 55 dB @ 100 kHz - suppresses switching noise from DC-DC converters feeding intermediate rails.
Enable Threshold	V_IL ≤ 0.4 V, V_IH ≥ 1 V - ensures reliable interface with 1.8 V/3.3 V GPIOs without level-shifting.
Output Capacitor	Compatible with ≥0.47 µF X5R/X7R ceramic - eliminates need for tantalum or electrolytic capacitors, reducing board area and cost.

Pinout & Package

LD39030ADTPU12R is housed in a thermally enhanced DFN4 1×1 mm package with exposed thermal pad connected to GND. The 4-pin layout supports minimal PCB footprint and efficient heat dissipation in space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Regulated output voltage node	Delivers stable 1.2 V to load; requires ≥0.47 µF ceramic capacitor placed adjacent to pin for stability.
2 (GND)	Analog and power ground reference	Common return path for input/output capacitors and thermal pad; must be low-impedance plane connection.
3 (EN)	Logic-controlled enable input	Active-high control: drives device into <0.1 µA shutdown when pulled low; compatible with 1.8 V/3.3 V microcontrollers.
4 (IN)	Unregulated input voltage supply	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed within 2 mm of pin to suppress input ripple.
Thermal Pad	Internal junction-to-PCB thermal conduction path	Must be soldered to solid GND copper pour to achieve R_thJA = 250 °C/W and sustain full 300 mA load at 125 °C ambient.

Key Features

Feature	Design Value
Ultra-low dropout	330 mV max at 300 mA ensures regulation from single-cell batteries down to 1.5 V input.
High-accuracy output	±0.5 % tolerance at 25 °C enables direct powering of 1.2 V FPGA I/O banks and ARM Cortex-A cores without post-regulation trimming.
Low-noise operation	45 µV_RMS output noise (10 Hz–100 kHz) minimizes jitter in clock generators and ADC reference supplies.
Integrated soft-start	100 µs controlled ramp-up prevents inrush current spikes that could destabilize upstream DC-DC converters.
Output discharge function	On-chip MOSFET discharges C_OUT rapidly upon shutdown - critical for fast power-state transitions in camera auto-focus modules.

Applications

Mobile Imaging Subsystem

Digital Still Camera (DSC) Core Rail

Use Scenario: Powering CMOS image sensor analog front-end and ISP core logic in compact smartphones.

IC Role / Device Role / Timing Role: Primary LDO delivering clean 1.2 V to sensor pixel array and ADC reference, synchronized with frame capture timing.

Use Value: Ultra-low noise and ±0.5 % accuracy prevent fixed-pattern noise and color channel drift during high-resolution burst capture.

Use Scenario: Regulating processor core voltage in standalone digital cameras with dual-battery operation.

IC Role / Device Role / Timing Role: Main system LDO enabling boot from 2.8 V Li-ion or 1.5 V alkaline cells via wide 1.5–5.5 V input range.

Use Value: 300 mV dropout and 20 µA quiescent current extend usable battery life by >18% versus standard LDOs in standby photo-review mode.

Wearable Health Sensor Hub

Bluetooth LE Audio Earbud SoC

Use Scenario: Supplying ultra-low-power ECG/PPG analog signal chain in wrist-worn monitors.

IC Role / Device Role / Timing Role: Precision bias rail for instrumentation amplifiers and 16-bit sigma-delta ADCs, active during biometric sampling windows.

Use Value: 45 µV_RMS noise floor and 80 dB PSRR eliminate switching artifacts from concurrent BLE radio transmission.

Use Scenario: Providing regulated 1.2 V to Bluetooth audio SoC DSP and codec blocks in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Secondary LDO activated only during audio playback, controlled via host MCU GPIO.

Use Value: <0.1 µA shutdown current and 100 µs soft-start reduce average power by 2.3 µW per earbud during silent intervals.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B122MR-G	1.2 V, ±2 % accuracy, 250 mV dropout at 300 mA, no output discharge, 35 µA IQ	Lacks output discharge and tighter accuracy; suitable only where fast power-down discharge is not required	Select when cost sensitivity outweighs need for 0.5 % accuracy or discharge functionality.
Richtek RT9013-12GB	1.2 V, ±2 % accuracy, 300 mV dropout at 300 mA, 25 µA IQ, no soft-start or discharge	No internal soft-start or discharge MOSFET; requires external RC network for controlled ramp if needed	Choose for legacy designs already using RT9013 footprint and where thermal pad grounding is impractical.

Compared with XC6210B122MR-G and RT9013-12GB, LD39030ADTPU12R delivers superior accuracy (±0.5 % vs. ±2 %), guaranteed discharge capability, and integrated soft-start-making it optimal for next-generation imaging and ultra-low-power wearable systems demanding precise, noise-free, and fast-state-transition power delivery.

Availability

LD39030ADTPU12R is available at Aetrix Electronics and suitable for mobile imaging subsystems, digital still cameras, wearable health monitors, and Bluetooth LE audio earbuds requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LD39030ADTPU12R 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 specializing in power management, microcontrollers, and analog ICs for automotive, industrial, and consumer applications.

LD39030ADTPU12R belongs to ST's high-accuracy, ultra-low-IQ LDO family engineered for battery-powered portable electronics where precision, efficiency, and miniaturization are critical design constraints.

FAQ

What is the minimum output capacitor value required for stable operation?

The LD39030ADTPU12R is stable with a minimum effective output capacitance of 220 nF, but ST specifies 0.47 µF as the recommended minimum for guaranteed stability across temperature, input voltage, and load variations. X5R or X7R ceramic types are required to maintain ESR and capacitance within the stable region shown in Figure 17 of DS11386.

Does LD39030ADTPU12R include output discharge functionality?

Yes. The "ADT" suffix in LD39030ADTPU12R indicates inclusion of the internal output discharge MOSFET, which activates when the EN pin is driven low to rapidly discharge the output capacitor. This feature is confirmed in Table 7 (Ordering Information) and Section 6.2 of the datasheet.

What is the maximum junction temperature and how is thermal protection implemented?

The LD39030ADTPU12R has an operating junction temperature range of -40 °C to 125 °C and incorporates internal thermal shutdown at 160 °C with 20 °C hysteresis. When triggered, the device disables the pass transistor until junction temperature falls below 140 °C, preventing permanent damage during sustained overload or poor PCB thermal design.

Can LD39030ADTPU12R operate with input voltages below 1.5 V?

No. Absolute maximum ratings specify VIN ≥ -0.3 V, but functional operation requires VIN ≥ 1.5 V per Table 5. Attempting operation below 1.5 V results in loss of regulation, increased dropout, and potential instability - the 1.2 V output cannot be maintained with insufficient headroom.

LD39030ADTPU12R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 4-XDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.33V @ 300mA (Typ)

Current - Output:: 300mA

Current - Quiescent (Iq):: 40 µA

Current - Supply (Max):: 130 µA

PSRR:: 80dB ~ 55dB (1kHz ~ 100kHz)

Control Features:: Enable, Soft Start

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-DFN (1x1)

LD39030ADTPU12R FAQ

1.How can I place an order for LD39030ADTPU12R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39030ADTPU12R 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 LD39030ADTPU12R reliable?

The price and inventory of LD39030ADTPU12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030ADTPU12R is usually 5 days.

3.What payment methods are accepted for LD39030ADTPU12R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030ADTPU12R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39030ADTPU12R?

LD39030ADTPU12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39030ADTPU12R 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 LD39030ADTPU12R?

For technical support, including LD39030ADTPU12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030ADTPU12R requirements.

6.How does Aetrix verify that LD39030ADTPU12R is sourced from the original manufacturer or authorized distributors?

All LD39030ADTPU12R 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 LD39030ADTPU12R meets industry standards.

7.What is the process for return or replacement of LD39030ADTPU12R?

All LD39030ADTPU12R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030ADTPU12R, 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 LD39030ADTPU12R part is unused and in its original packaging.

Return procedure for LD39030ADTPU12R:

1.Submit a request within 90 days.

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

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