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

STMicroelectronics LD39020ADM30R

Name: LD39020ADM30R
Brand: STMicroelectronics
SKU: LD39020ADM30R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39020ADM30R

Manufacturer:: STMicroelectronics

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

Package:: SC-74A, SOT-753

Datasheet:: LD39020ADM30R.pdf

Description:: IC REG LINEAR 3V 200MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,603

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Product details

Overview

LD39020ADM30R from STMicroelectronics is a 3.0 V, ±0.5 % accuracy, 200 mA ultra-low-dropout linear regulator in SOT23-5L package, featuring 200 mV typical dropout at full load, 20 µA quiescent current at no load, and logic-controlled shutdown. It delivers stable low-noise power for precision analog rails in compact battery-powered systems such as digital still cameras and portable media players.

For engineers reviewing the LD39020ADM30R datasheet, LD39020ADM30R pinout, LD39020ADM30R application, or LD39020ADM30R equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative options with documented functional differences.

Technical Context

The LD39020ADM30R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a fixed-output LDO architecture. Its internal soft-start circuit limits inrush current by controlling output ramp-up over ~100 µs without external components.

It includes an enable-controlled discharge MOSFET (active when EN = low) to rapidly deplete the output capacitor, and features thermal shutdown with 160 °C trip point and 20 °C hysteresis. PSRR reaches 80 dB at 1 kHz and 55 dB at 100 kHz, supporting noise-sensitive analog loads.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 3.0 V with ±0.5 % tolerance at 25 °C - enables direct replacement of 3.0 V references in precision sensor or ADC biasing circuits.
Max output current	200 mA guaranteed - sufficient to power microcontroller cores, RF transceivers, or small display drivers without derating.
Dropout voltage	200 mV typ. at 200 mA - allows operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min) while maintaining regulation.
Quiescent current	20 µA typ. at no load - extends battery life in always-on monitoring nodes where standby current dominates energy budget.
PSRR	80 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal SoCs.
Enable threshold	V_IL ≤ 0.4 V, V_IH ≥ 1.0 V - compatible with 1.8 V and 3.3 V GPIOs without level-shifting.
Operating temp	−40 °C to +125 °C junction - qualified for automotive cabin and industrial edge controller environments.

Pinout & Package

LD39020ADM30R is housed in a 5-pin SOT23-5L package (2.95 mm × 1.60 mm × 1.45 mm), optimized for space-constrained PCB layouts. The exposed pad is not present - all thermal dissipation occurs through leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 1.5–5.5 V; requires ≥1 µF ceramic decoupling placed adjacent to pin for stability and transient response.
2 (GND)	Power ground reference	Common return path for input/output currents and internal bias; must connect to low-impedance analog ground plane.
3 (EN)	Logic enable control	Active-high input; drives device into <0.1 µA shutdown when pulled low; compatible with standard CMOS logic levels.
4 (NC)	No internal connection	Unbonded pin; must be left floating or tied to GND per layout best practice - no electrical function.
5 (OUT)	Regulated output	Delivers 3.0 V ±0.5 %; supports 0.47–22 µF ceramic output capacitors; includes integrated discharge MOSFET (enabled).

Key Features

Feature	Design Value
Ultra-low dropout	200 mV at 200 mA enables regulation down to 3.2 V input - critical for extending runtime in single-cell Li-ion systems.
Output discharge	Integrated MOSFET actively discharges VOUT when disabled - prevents residual voltage from interfering with system power sequencing or causing latch-up.
Ceramic capacitor support	Stable with ≥0.47 µF X5R/X7R ceramics - eliminates need for tantalum or electrolytic caps, reducing board area and improving reliability.
Internal soft-start	100 µs controlled ramp-up - avoids inrush current spikes that could collapse shared input rails or trigger upstream current limiting.
High PSRR	80 dB @ 1 kHz - maintains clean 3.0 V rail for noise-sensitive analog blocks (e.g., audio codecs, precision ADCs) in noisy DC/DC environments.

Applications

Digital Still Camera (DSC)

Portable Media Player

Use Scenario: Powering image sensor analog front-end and ISP core requiring low-noise, tightly regulated 3.0 V.

IC Role / Device Role / Timing Role: Primary low-noise LDO delivering clean bias for CCD/CMOS sensor analog chain and timing-critical ISP logic.

Use Value: 80 dB PSRR and 45 µV_RMS output noise prevent corruption of high-resolution image data during capture.

Use Scenario: Supplying DAC, headphone amplifier, and flash memory interface in battery-powered audio playback devices.

IC Role / Device Role / Timing Role: Fixed 3.0 V LDO providing stable reference for audio DAC and low-jitter clock generation circuitry.

Use Value: ±0.5 % output accuracy ensures consistent audio amplitude scaling; 20 µA quiescent current extends playback time between charges.

Mobile Phone Baseband

Cordless Phone Handset

Use Scenario: Regulating power to cellular modem baseband processor I/O and auxiliary analog peripherals.

IC Role / Device Role / Timing Role: Secondary LDO supplying 3.0 V to modem interface logic and RF front-end bias controls.

Use Value: Logic-controlled shutdown synchronizes with modem sleep states, cutting leakage to <0.1 µA during idle periods.

Use Scenario: Providing regulated 3.0 V to DECT radio transceiver and voice codec in compact cordless handset PCBs.

IC Role / Device Role / Timing Role: Compact-area LDO enabling tight integration of RF and audio sections within strict height constraints.

Use Value: SOT23-5L footprint (2.95 × 1.60 mm) saves >40 % board area vs. standard SOT23-5; 125 °C rating supports sealed enclosure thermal profiles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P302MR	3.0 V, ±2 % accuracy, 150 mA max, no enable or discharge, SOT23-3 package	Lacks shutdown control and output discharge; limited to simpler, non-sequenced systems	Select only if board space permits larger dropout margin and system does not require active discharge or precise enable timing.
ROHM BD39020GUL	3.0 V, ±1 % accuracy, 200 mA, SOT23-5, no discharge MOSFET, 30 µA IQ	Higher output tolerance and quiescent current; lacks auto-discharge function	Prefer when cost sensitivity outweighs need for fast VOUT decay or tighter voltage accuracy in battery-gauge-critical designs.

Compared with XC6206P302MR and BD39020GUL, LD39020ADM30R uniquely combines ±0.5 % accuracy, integrated discharge, and sub-25 µA quiescent current in SOT23-5L - making it optimal for space-constrained, multi-rail battery systems requiring precise sequencing and minimal standby loss.

Availability

LD39020ADM30R is available at Aetrix Electronics and suitable for digital still cameras, portable media players, and cordless phone handsets requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for volume production.

Supply support for LD39020ADM30R 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.

LD39020ADM30R belongs to ST's high-accuracy, ultra-low-I_Q LDO family targeting battery-powered portable electronics - engineered to maximize runtime while meeting stringent noise and regulation requirements of modern imaging and audio subsystems.

FAQ

What is the minimum input voltage required for regulation at 3.0 V output?

The LD39020ADM30R maintains regulation down to VIN = VOUT + VDROP. With 200 mV typical dropout at 200 mA, the minimum functional input is 3.2 V under full load. At lighter loads (e.g., 10 mA), dropout drops to 35 mV, allowing stable operation from 3.035 V - enabling use with partially discharged single-cell Li-ion batteries.

Does LD39020ADM30R require an external capacitor on the EN pin?

No. The EN pin has no internal filtering or timing requirement; it is a standard CMOS logic input with 100 nA leakage. A pull-up resistor (e.g., 100 kΩ to VIN) is recommended for robust startup in noisy environments, but no capacitor is needed - unlike older LDOs requiring RC delays for sequencing.

Can LD39020ADM30R be used with a 0.22 µF output capacitor?

No. While the regulator remains stable with ≥220 nF capacitance under ideal conditions, ST specifies a minimum of 0.47 µF ceramic (X5R/X7R) for guaranteed stability across temperature, input voltage, and load variations. Using 0.22 µF risks oscillation during load transients or at temperature extremes.

Is the NC pin on SOT23-5L electrically isolated or internally grounded?

The NC (pin 4) is unconnected internally - no bond wire, no die attachment. It must be left floating or tied to GND on the PCB per ST's layout recommendation to minimize parasitic coupling; it is not a thermal pad or ground tie, and connecting it to any voltage rail may cause unpredictable behavior.

LD39020ADM30R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-74A, SOT-753

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):: 3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.35V @ 200mA

Current - Output:: 200mA

Current - Quiescent (Iq):: 40 µA

Current - Supply (Max):: -

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

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Soft Start

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

LD39020ADM30R FAQ

1.How can I place an order for LD39020ADM30R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39020ADM30R 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 LD39020ADM30R reliable?

The price and inventory of LD39020ADM30R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020ADM30R is usually 5 days.

3.What payment methods are accepted for LD39020ADM30R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020ADM30R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39020ADM30R?

LD39020ADM30R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39020ADM30R 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 LD39020ADM30R?

For technical support, including LD39020ADM30R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020ADM30R requirements.

6.How does Aetrix verify that LD39020ADM30R is sourced from the original manufacturer or authorized distributors?

All LD39020ADM30R 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 LD39020ADM30R meets industry standards.

7.What is the process for return or replacement of LD39020ADM30R?

All LD39020ADM30R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020ADM30R, 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 LD39020ADM30R part is unused and in its original packaging.

Return procedure for LD39020ADM30R:

1.Submit a request within 90 days.

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

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