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

STMicroelectronics LD39020ADTPU28R

Name: LD39020ADTPU28R
Brand: STMicroelectronics
SKU: LD39020ADTPU28R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39020ADTPU28R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39020ADTPU28R.pdf

Description:: IC REG LINEAR 2.8V 200MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,736

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Product details

Overview

LD39020ADTPU28R from STMicroelectronics is a high-accuracy, 200 mA low-dropout linear regulator with 2.8 V fixed output voltage, ±0.5 % tolerance at 25 °C, 200 mV typical dropout at 200 mA load, and ultra-low 20 µA quiescent current at no load - designed for power-sensitive battery-operated systems such as mobile phones and digital still cameras.

For engineers reviewing the LD39020ADTPU28R datasheet, LD39020ADTPU28R pinout, LD39020ADTPU28R application, or LD39020ADTPU28R equivalent, key selection criteria include output accuracy, shutdown current (<0.1 µA), ceramic capacitor compatibility (≥0.47 µF), thermal protection, and auto-discharge MOSFET functionality.

Technical Context

The LD39020ADTPU28R integrates a bandgap reference, error amplifier, and internal soft-start circuit to ensure controlled turn-on without external components. Its enable-controlled shutdown reduces input current to 0.03 µA typ., and the optional output discharge MOSFET (present in ADT variants) actively pulls VOUT to GND when disabled.

Stabilized with ceramic capacitors as low as 0.47 µF, it achieves 80 dB PSRR at 1 kHz and maintains regulation across –40 °C to +125 °C junction temperature. The device uses internal current limiting and thermal shutdown (160 °C with 20 °C hysteresis) for robust fault protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 2.8 V with ±0.5 % accuracy at 25 °C - enables precise biasing of RF front-ends and low-voltage logic rails.
Dropout voltage	200 mV typ. at 200 mA - supports operation down to VIN = 3.0 V while maintaining regulation, critical for single-cell Li-ion systems.
Quiescent current	20 µA typ. at no load; 0.03 µA typ. in shutdown - extends battery life in always-on sensor nodes and standby modes.
PSRR	80 dB @ 1 kHz, 55 dB @ 100 kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal portable designs.
Output discharge	Integrated MOSFET (RON = 100 Ω) activated during shutdown - ensures rapid VOUT decay to prevent latch-up or back-powering in multi-rail systems.
Capacitor support	Stable with ≥0.47 µF ceramic COUT (X5R/X7R recommended) - eliminates need for bulky tantalum or electrolytic capacitors.
Operating temp.	–40 °C to +125 °C junction range - qualified for automotive infotainment modules and industrial handhelds.

Pinout & Package

LD39020ADTPU28R is packaged in DFN4 1×1 mm (0.4 mm height), a space-constrained footprint ideal for ultra-thin mobile PCBs. Thermal pad must be connected to PCB ground for optimal thermal performance.

Pin	Circuit Role	Design Meaning
1 (OUT)	Regulated output terminal	Delivers stable 2.8 V to load; requires ≥0.47 µF ceramic capacitor placed adjacent to pin for loop stability.
2 (GND)	Analog and power ground reference	Common return path for internal bias, feedback, and thermal pad; must be low-impedance connection to PCB ground plane.
3 (EN)	Logic-enable input	Active-high control: <0.4 V = shutdown (<0.1 µA I_IN), >1 V = active; compatible with 1.8 V/3.3 V GPIOs.
4 (IN)	Input voltage supply	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed within 2 mm of pin to minimize input ripple and EMI.
Thermal pad	Exposed thermal interface	Internally connected to GND; soldered to PCB copper pour to reduce R_thJA by up to 40 % and sustain full 200 mA load at 125 °C.

Key Features

Feature	Design Value
Ultra-low dropout	200 mV typ. at 200 mA - enables use with depleted batteries or low-headroom supplies without regulation loss.
Auto-discharge function	Integrated 100 Ω NMOS between VOUT and GND - discharges output in <1 ms when EN = low, preventing residual voltage issues.
Internal soft-start	100 µs controlled ramp-up - limits inrush current to <100 mA, eliminating need for external RC timing networks.
High PSRR	80 dB @ 1 kHz - rejects noise from PMIC switchers, enabling clean power for ADCs, PLLs, and RF ICs.
Low-noise operation	45 µV_RMS (10 Hz–100 kHz) - suitable for powering sensitive analog circuits like audio codecs and precision sensors.

Applications

Mobile Phone Power Management

Digital Still Camera Sensor Bias

Use Scenario: Supplying 2.8 V to CMOS image sensor analog front-end and ISP core in compact smartphone modules.

IC Role / Device Role / Timing Role: Primary LDO delivering low-noise, tightly regulated voltage with fast transient response to dynamic pixel readout loads.

Use Value: Enables 12-bit+ image fidelity by suppressing supply-induced fixed-pattern noise and maintaining <±0.5 % output accuracy over temperature.

Use Scenario: Powering high-speed image signal processor (ISP) I/O banks requiring stable 2.8 V during burst capture sequences.

IC Role / Device Role / Timing Role: Secondary LDO providing isolated, low-ripple rail decoupled from main system PMIC to avoid clock jitter coupling.

Use Value: Reduces timing skew in parallel LVDS data lanes via 80 dB PSRR at 1 kHz, preserving pixel data integrity.

Wearable Health Monitor

Bluetooth LE Audio Earbud

Use Scenario: Regulating 2.8 V for optical heart-rate sensor (PPG) ASIC and analog front-end in wrist-worn devices.

IC Role / Device Role / Timing Role: Always-on LDO with sub-µA shutdown current, activated only during sensor sampling intervals.

Use Value: Extends battery runtime beyond 7 days on coin cell by minimizing quiescent draw (20 µA typ.) and enabling deep-sleep discharge control.

Use Scenario: Supplying 2.8 V to Bluetooth radio transceiver and DAC in true wireless stereo (TWS) earbuds with tight space constraints.

IC Role / Device Role / Timing Role: Compact-area LDO using DFN4 1×1 package to fit within 3.5 mm × 3.5 mm earbud PCB real estate.

Use Value: Delivers clean 2.8 V with 45 µV_RMS noise to minimize DAC quantization error and improve SNR in audio playback.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B282MR-G	200 mA, 2.8 V, ±2 % accuracy, no auto-discharge, SOT-25 package	Lacks output discharge MOSFET and tighter ±0.5 % tolerance - unsuitable where rapid VOUT decay or precision bias is required.	Select only if cost sensitivity outweighs need for accuracy and discharge control; verify thermal derating in DFN4 footprint-constrained layouts.
Richtek RT9013-28GB	300 mA, 2.8 V, ±2 % accuracy, 25 µA IQ, no discharge, SOT-23-5	Higher current rating but looser tolerance and missing discharge function - better for general-purpose loads, not precision analog rails.	Prefer when higher output current headroom is needed and board space allows larger SOT-23-5; avoid in systems requiring <1 ms VOUT decay.

Compared with XC6210B282MR-G and RT9013-28GB, LD39020ADTPU28R uniquely combines ±0.5 % accuracy, integrated discharge, and DFN4 1×1 size - making it the only choice for space-constrained, high-fidelity portable analog power domains.

Availability

LD39020ADTPU28R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and wearable health monitors requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance across temperature.

Supply support for LD39020ADTPU28R 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 microcontrollers, power management ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

LD39020 belongs to ST's ultra-low-quiescent-current LDO portfolio, engineered specifically for battery-powered portable electronics demanding minimal standby power, fast enable response, and high output accuracy under thermal stress.

FAQ

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

The LD39020ADTPU28R is stable with a minimum 0.47 µF X5R or X7R ceramic capacitor on the output. While the control loop functions down to 220 nF, 0.47 µF is the recommended minimum to ensure stability across –40 °C to +125 °C, full load range (0–200 mA), and input voltage variation (1.5–5.5 V).

Does LD39020ADTPU28R support adjustable output voltage?

No - LD39020ADTPU28R is a fixed-output variant with factory-trimmed 2.8 V regulation. ST offers adjustable versions (e.g., LD39020ADJ) in the same family, but this specific part number has no external feedback resistor network and cannot be reconfigured.

How does the output discharge MOSFET behave during shutdown?

When EN is pulled low, the internal 100 Ω NMOS connects VOUT directly to GND, discharging the output capacitor in under 1 ms (depending on COUT value). This prevents back-powering of upstream circuitry and ensures safe power sequencing in multi-rail systems.

Can LD39020ADTPU28R operate with input voltage below 1.5 V?

No - the absolute minimum input voltage is 1.5 V per datasheet specifications. Operation below this risks loss of regulation, increased dropout, or undefined behavior. At 2.8 V output, VIN must remain ≥3.0 V to maintain margin above the 200 mV typical dropout.

LD39020ADTPU28R 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):: 2.8V

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:: 4-DFN (1x1)

LD39020ADTPU28R FAQ

1.How can I place an order for LD39020ADTPU28R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39020ADTPU28R 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 LD39020ADTPU28R reliable?

The price and inventory of LD39020ADTPU28R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020ADTPU28R is usually 5 days.

3.What payment methods are accepted for LD39020ADTPU28R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020ADTPU28R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39020ADTPU28R?

LD39020ADTPU28R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39020ADTPU28R 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 LD39020ADTPU28R?

For technical support, including LD39020ADTPU28R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020ADTPU28R requirements.

6.How does Aetrix verify that LD39020ADTPU28R is sourced from the original manufacturer or authorized distributors?

All LD39020ADTPU28R 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 LD39020ADTPU28R meets industry standards.

7.What is the process for return or replacement of LD39020ADTPU28R?

All LD39020ADTPU28R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020ADTPU28R, 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 LD39020ADTPU28R part is unused and in its original packaging.

Return procedure for LD39020ADTPU28R:

1.Submit a request within 90 days.

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

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