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

STMicroelectronics LD39020DTPU11R

Name: LD39020DTPU11R
Brand: STMicroelectronics
SKU: LD39020DTPU11R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39020DTPU11R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39020DTPU11R.pdf

Description:: IC REG LINEAR 1.1V 200MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,289

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Product details

Overview

LD39020DTPU11R from STMicroelectronics is a 200 mA ultra-low-dropout linear regulator with 1.1 V fixed output voltage, 200 mV typical dropout at 200 mA, ±2.0 % output accuracy at 25 °C, and logic-controlled enable/shutdown. It features 20 µA typical quiescent current at no load, internal soft-start, optional output discharge MOSFET, and operates from 1.5 V to 5.5 V input - designed for space-constrained, battery-powered systems such as mobile phone baseband processors and camera sensor rails.

For engineers reviewing the LD39020DTPU11R datasheet, LD39020DTPU11R pinout, LD39020DTPU11R application, or LD39020DTPU11R equivalent, key selection criteria include dropout performance under 200 mA load, shutdown current < 0.1 µA, ceramic capacitor compatibility (≥0.47 µF), thermal behavior in DFN4 1x1 package, and functional distinction between auto-discharge (DT) and non-discharge (T) variants.

Technical Context

The LD39020DTPU11R implements a bandgap-referenced error amplifier driving a PMOS pass transistor, enabling ultra-low dropout and high PSRR (80 dB @ 1 kHz). Its internal soft-start circuit limits inrush current by controlling output ramp-up over ~100 µs without external components.

It integrates logic-level enable (EN) with hysteresis-free threshold (0.4 V low / 1 V high), thermal shutdown at 160 °C with 20 °C hysteresis, and an optional integrated discharge MOSFET (enabled in "DT" suffix variants like this part) that actively pulls VOUT to GND during shutdown - critical for fast power-state transitions in portable systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 1.1 V - matches low-voltage I/O or core rails of modern SoCs and image sensors.
Max output current	200 mA guaranteed - sufficient for single-core microcontrollers or compact camera modules.
Dropout voltage	200 mV typ. @ 200 mA - enables regulation from 1.3 V input, extending battery runtime in Li-ion/Li-poly systems.
Quiescent current	20 µA typ. @ no load - minimizes standby power loss in always-on subsystems.
PSRR	80 dB @ 1 kHz - suppresses switching noise from adjacent DC-DC converters feeding noisy supply rails.
Output discharge	Integrated MOSFET (RON ≈ 100 Ω) - discharges output capacitor rapidly on disable, preventing residual voltage hold-up.
Operating temp	–40 °C to +125 °C junction - supports automotive cabin and industrial edge device deployment.
Capacitor support	Stable with ≥0.47 µF ceramic COUT - eliminates need for bulky tantalum or electrolytic capacitors.

Pinout & Package

LD39020DTPU11R is packaged in DFN4 1x1 (1.0 mm × 1.0 mm, 0.4 mm height), optimized for ultra-dense PCB layouts. Thermal pad is internally connected to GND and must be soldered to PCB ground plane for thermal and electrical integrity.

Pin	Circuit Role	Design Meaning
1 (OUT)	Regulated output	Delivers stable 1.1 V; requires ≥0.47 µF ceramic capacitor placed adjacent to pin for loop stability.
2 (GND)	Power ground	Common return for input, output, and bias circuits; connects to thermal pad for heat dissipation.
3 (EN)	Enable control input	Active-high logic: < 0.4 V = shutdown (<0.1 µA I_STANDBY), >1 V = active; no pull-up required.
4 (IN)	Input voltage supply	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed close to minimize input ripple and ESR effects.
Thermal pad	Ground & thermal path	Must be soldered to PCB GND plane; improves thermal resistance (R_thJA = 250 °C/W) and EMI performance.

Key Features

Feature	Design Value
Ultra-low dropout	200 mV @ 200 mA enables operation from partially discharged batteries (e.g., 1.3 V cutoff for Li-ion).
Low-noise regulation	45 µV_RMS (10 Hz–100 kHz) supports noise-sensitive analog/RF blocks without additional filtering.
Logic-controlled shutdown	EN pin draws only 100 nA; reduces total system current to <0.1 µA in off-mode - ideal for IoT wake-on-event designs.
Internal soft-start	100 µs controlled ramp prevents inrush-induced supply sag or brownout in shared rail systems.
Output discharge	Integrated 100 Ω NMOS discharges VOUT within microseconds upon EN deactivation - avoids floating outputs in multi-rail sequencing.
Ceramic capacitor compatible	Stable with 0.47–22 µF X5R/X7R ceramics - eliminates cost, size, and reliability penalties of electrolytic alternatives.

Applications

Mobile Baseband Power

Digital Camera Sensor Rail

Use Scenario: Powers ARM Cortex-A/M series application processors' I/O or auxiliary cores in smartphones and tablets.

IC Role / Device Role / Timing Role: Primary LDO for 1.1 V interface voltage domain, sequenced after main PMIC rails.

Use Value: Ultra-low quiescent current extends standby time; 200 mV dropout preserves headroom during battery voltage decay.

Use Scenario: Supplies image sensor analog front-end (AFE) and timing controller in compact digital still cameras.

IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO delivering clean 1.1 V to CIS pixel array and ADC reference.

Use Value: 45 µV_RMS noise and 80 dB PSRR prevent fixed-pattern noise and clock feedthrough in high-resolution imaging.

Wearable System Sub-Rail

Bluetooth Audio SoC Core

Use Scenario: Provides regulated 1.1 V to motion sensor fusion ICs and ultra-low-power MCUs in smartwatches.

IC Role / Device Role / Timing Role: Standby-optimized LDO with EN-controlled deep-sleep mode synchronized to host MCU sleep states.

Use Value: 0.03 µA standby current ensures months of shelf life; soft-start prevents wake-up glitches during sensor polling.

Use Scenario: Feeds 1.1 V core rail of Bluetooth LE audio SoCs (e.g., CSR8675 derivatives) in true wireless earbuds.

IC Role / Device Role / Timing Role: High-PSRR LDO decoupling RF transceiver from noisy switching regulators in compact RF modules.

Use Value: 55 dB PSRR @ 100 kHz suppresses DC-DC switching artifacts near 2.4 GHz band, improving EVM and sensitivity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B112MR-G	1.1 V fixed, 150 mA, 150 mV dropout @ 100 mA, no discharge MOSFET, SOT-25 package	Lacks output discharge and thermal shutdown hysteresis; lower current rating limits use in higher-load sensor clusters	Select when board space allows SOT-25 and discharge function is unnecessary; verify thermal margin at 200 mA.
Richtek RT9013-11GB	1.1 V fixed, 300 mA, 250 mV dropout @ 300 mA, 25 µA IQ, no discharge, SOT-23-5	Higher current capability but larger footprint and no discharge - unsuitable for fast power-state cycling	Prefer for higher-current loads where discharge is not required; avoid in battery-critical wearables needing sub-µA shutdown.

Compared with XC6210B112MR-G and RT9013-11GB, LD39020DTPU11R uniquely combines 200 mA capability, ultra-low 20 µA quiescent current, integrated discharge, and DFN4 1x1 footprint - making it optimal for miniaturized, multi-state portable devices demanding rapid rail control and extended battery life.

Availability

LD39020DTPU11R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless communication systems requiring stable component supply, consistent parametric performance across temperature, and long-term lifecycle availability.

Supply support for LD39020DTPU11R 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The LD39020 belongs to ST's high-accuracy, ultra-low-I_Q LDO family - engineered specifically for battery-powered portable electronics where minimal standby power, fast transient response, and ultra-compact packaging are mandatory design constraints.

FAQ

What is the minimum input voltage required for regulation at 1.1 V output?

The LD39020DTPU11R requires VIN ≥ VOUT + VDROP. With 200 mV typical dropout at 200 mA, regulation is maintained down to 1.3 V input. Absolute minimum operating VIN is 1.5 V per datasheet specifications - below which internal biasing fails and output collapses.

Does LD39020DTPU11R require an external pull-up resistor on the EN pin?

No. The EN pin has CMOS-compatible input structure with leakage <100 nA and defined logic thresholds (V_IL ≤ 0.4 V, V_IH ≥ 1 V). It can be driven directly from GPIO or open-drain controllers without pull-up; internal biasing ensures valid state during power-up.

Can LD39020DTPU11R be used with a 0.22 µF output capacitor?

No. While the regulator may remain stable with 0.22 µF under narrow conditions, the datasheet mandates ≥0.47 µF ceramic COUT for guaranteed stability across –40 °C to +125 °C, full load range, and input voltage variation. Using smaller values risks oscillation or poor transient response.

How does the output discharge feature behave during EN assertion?

When EN transitions from high to low, the internal discharge MOSFET turns on within ~1 µs and sinks current until VOUT drops below ~0.2 V. Discharge time depends on COUT value and ESR; for 4.7 µF, typical discharge is <1 ms. The MOSFET turns off immediately upon EN re-assertion.

LD39020DTPU11R 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):: 1.1V

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)

LD39020DTPU11R FAQ

1.How can I place an order for LD39020DTPU11R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39020DTPU11R 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 LD39020DTPU11R reliable?

The price and inventory of LD39020DTPU11R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020DTPU11R is usually 5 days.

3.What payment methods are accepted for LD39020DTPU11R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020DTPU11R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39020DTPU11R?

LD39020DTPU11R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39020DTPU11R 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 LD39020DTPU11R?

For technical support, including LD39020DTPU11R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020DTPU11R requirements.

6.How does Aetrix verify that LD39020DTPU11R is sourced from the original manufacturer or authorized distributors?

All LD39020DTPU11R 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 LD39020DTPU11R meets industry standards.

7.What is the process for return or replacement of LD39020DTPU11R?

All LD39020DTPU11R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020DTPU11R, 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 LD39020DTPU11R part is unused and in its original packaging.

Return procedure for LD39020DTPU11R:

1.Submit a request within 90 days.

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

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