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

STMicroelectronics LD39020DTPU31R

Name: LD39020DTPU31R
Brand: STMicroelectronics
SKU: LD39020DTPU31R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39020DTPU31R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39020DTPU31R.pdf

Description:: IC REG LINEAR 3.1V 200MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,170

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Product details

Overview

LD39020DTPU31R from STMicroelectronics is a 3.1 V, ±2% tolerance, 200 mA ultra-low-dropout linear regulator IC optimized for space-constrained battery-powered systems. It operates from 1.5 V to 5.5 V input, delivers 200 mV typical dropout at 200 mA, and features 20 µA typical quiescent current and logic-controlled shutdown - enabling use in mobile phones, digital still cameras, and portable media players.

For engineers reviewing the LD39020DTPU31R datasheet, LD39020DTPU31R pinout, LD39020DTPU31R application, or LD39020DTPU31R equivalent, key selection criteria include output accuracy (±2%), thermal shutdown threshold (160 °C), soft-start timing (100 µs), PSRR (80 dB @ 1 kHz), and compatibility with 0.47 µF ceramic output capacitors.

Technical Context

The LD39020DTPU31R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a voltage-follower configuration, enabling stable regulation with minimal headroom. Its internal soft-start circuit limits inrush current without external components, and the enable pin (EN) controls active/shutdown states with sub-0.1 µA standby current.

It supports optional output discharge via an integrated NMOS switch (present in "D" suffix variants like LD39020DTPU31R), activated when EN is low. The device is stabilized using ceramic capacitors only - no ESR requirements - and maintains stability across −40 °C to +125 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.1 V nominal, ±2% tolerance at 25 °C - ensures stable rail for 3.3 V–compatible logic with margin for load/temperature drift
Max Output Current	200 mA guaranteed - sufficient for powering RF transceivers, camera sensors, or microcontroller cores in portable devices
Dropout Voltage	200 mV typ. at 200 mA - enables operation down to 3.3 V input while maintaining 3.1 V output, critical for single-cell Li-ion or Li-poly systems
Quiescent Current	20 µA typ. at no load - minimizes battery drain during idle/sleep modes in always-on subsystems
PSRR	80 dB @ 1 kHz - suppresses switching noise from DC-DC converters feeding the LDO input, preserving analog/RF signal integrity
Enable Threshold	V_IL = 0.4 V max, V_IH = 1 V min - compatible with 1.8 V and 3.3 V GPIO logic without level-shifting
Thermal Shutdown	160 °C with 20 °C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up

Pinout & Package

LD39020DTPU31R is available in DFN4 1×1 mm (0.4 mm height) and SOT23-5L packages. This variant uses the DFN4 1x1 package, featuring a thermal pad for enhanced power dissipation and footprint reduction.

Pin	Circuit Role	Design Meaning
1 (OUT)	Regulated output voltage node	Delivers stable 3.1 V to load; requires 0.47 µF ceramic capacitor placed adjacent to minimize loop inductance
2 (GND)	Analog and power ground reference	Common return path for input/output capacitors and internal bias circuits; must be connected to low-impedance PCB ground plane
3 (EN)	Active-high enable control input	Drives internal pass transistor gate; logic high ≥1 V enables regulation, logic low ≤0.4 V disables output and activates shutdown mode
4 (IN)	Unregulated input supply connection	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed within 2 mm of pin to suppress input ripple and transient spikes
Thermal Pad	Internally connected to GND	Must be soldered to exposed copper on PCB for thermal conduction and EMI reduction; improves R_thJA by ~40 °C/W vs. floating pad

Key Features

Feature	Design Value
Ultra-low dropout	200 mV typ. at full 200 mA load - extends usable battery life in single-cell systems by delaying brownout
Logic-controlled shutdown	Sub-0.1 µA total supply current in OFF mode - eliminates leakage paths in deep-sleep system states
Internal soft-start	100 µs controlled ramp-up - prevents inrush current spikes that could destabilize upstream supplies or trigger overcurrent protection
Output discharge (integrated)	100 Ω NMOS switch between VOUT and GND - rapidly discharges hold-up capacitance upon disable, meeting fast-power-down timing requirements
Ceramic capacitor stability	Stable with C_OUT ≥ 0.47 µF, X5R/X7R dielectric - eliminates need for tantalum or aluminum electrolytic, reducing size and improving reliability

Applications

Mobile Phone Power Rail

Digital Still Camera Sensor Bias

Use Scenario: Supplies clean 3.1 V to image sensor analog front-end and ISP core in compact smartphone modules.

IC Role / Device Role / Timing Role: Low-noise post-regulator stepping down from a shared 3.8 V buck converter output.

Use Value: 45 µV_RMS output noise and 80 dB PSRR prevent pixel noise and color banding under RF transmission bursts.

Use Scenario: Powers CMOS image sensor's analog bias rails during burst capture mode with rapid on/off cycling.

IC Role / Device Role / Timing Role: Enable-controlled LDO delivering precise 3.1 V with <100 µs turn-on to meet sensor startup timing specs.

Use Value: Integrated soft-start and output discharge ensure repeatable sensor initialization and eliminate residual voltage holdover.

Portable Media Player Audio Codec

Cordless Phone Baseband IC

Use Scenario: Provides low-noise 3.1 V supply to stereo DAC and headphone amplifier in battery-operated audio players.

IC Role / Device Role / Timing Role: Primary analog rail regulator, decoupled from noisy digital domains using ceramic caps only.

Use Value: Ultra-low quiescent current (20 µA) extends playback time; 0.47 µF C_OUT enables ultra-thin PCB stackup.

Use Scenario: Powers baseband processor and RF transceiver in DECT cordless handsets operating from 2.4–3.6 V Li-ion packs.

IC Role / Device Role / Timing Role: Input-supply tolerant LDO maintaining 3.1 V output across full battery discharge curve (4.2 V → 2.8 V).

Use Value: 200 mV dropout allows >90% battery utilization; thermal shutdown (160 °C) prevents damage during extended talk-time operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, low-I_Q LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B312MR-G	3.1 V, ±2%, 200 mA, 150 mV dropout, 1 µA I_Q, no EN pin, SOT-25	Lacks enable control and output discharge; fixed-output only	Select when minimal quiescent current is prioritized over system-level power sequencing control
Richtek RT9013-31GB	3.1 V, ±2%, 300 mA, 250 mV dropout, 60 µA I_Q, EN pin, SOT-23-5	Higher I_Q, no output discharge, wider input range (2.0–6.0 V)	Select when higher output current headroom is required and discharge function is not needed

Compared with LD39020DTPU31R, the XC6210B312MR-G offers lower quiescent current but forfeits enable functionality and thermal protection, while the RT9013-31GB provides greater current capability at the cost of higher static power and absence of auto-discharge - making LD39020DTPU31R optimal for sequenced, low-noise, fast-shutdown portable systems.

Availability

LD39020DTPU31R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable media players requiring stable component supply with guaranteed long-term manufacturability and automotive-grade reliability screening.

Supply support for LD39020DTPU31R 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 analog, MCU, power, and sensing solutions 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 efficiency, size, and noise performance are critical.

FAQ

What is the minimum output capacitor required for stable operation of LD39020DTPU31R?

The LD39020DTPU31R is stable with a minimum 0.47 µF X5R or X7R ceramic capacitor on the output. While the control loop remains functional down to 220 nF, 0.47 µF is the recommended minimum to ensure stability across temperature, input voltage, and load variations per Figure 17 in DS9956.

Does LD39020DTPU31R include output voltage discharge functionality?

Yes. The "D" in the part number (LD39020DTPU31R) indicates inclusion of an integrated NMOS discharge switch (R_ON ≈ 100 Ω) between VOUT and GND, activated automatically when the EN pin is driven low - ensuring rapid discharge of output capacitance during shutdown.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum input voltage is 7 V, but the recommended operating input voltage range is 1.5 V to 5.5 V per datasheet Table 5. Exceeding 5.5 V risks exceeding safe power dissipation limits, especially at high ambient temperatures or high output currents.

How does thermal performance differ between DFN4 1x1 and SOT23-5L packages?

The DFN4 1x1 package has R_thJA = 250 °C/W, while the SOT23-5L has R_thJA = 255 °C/W - nearly identical junction-to-ambient resistance. However, the DFN4's exposed thermal pad provides superior heat spreading when soldered to a large copper area, yielding up to 20 °C lower junction temperature under identical 200 mA load conditions.

LD39020DTPU31R 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):: 3.1V

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)

LD39020DTPU31R FAQ

1.How can I place an order for LD39020DTPU31R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39020DTPU31R 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 LD39020DTPU31R reliable?

The price and inventory of LD39020DTPU31R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020DTPU31R is usually 5 days.

3.What payment methods are accepted for LD39020DTPU31R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020DTPU31R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39020DTPU31R?

LD39020DTPU31R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39020DTPU31R 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 LD39020DTPU31R?

For technical support, including LD39020DTPU31R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020DTPU31R requirements.

6.How does Aetrix verify that LD39020DTPU31R is sourced from the original manufacturer or authorized distributors?

All LD39020DTPU31R 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 LD39020DTPU31R meets industry standards.

7.What is the process for return or replacement of LD39020DTPU31R?

All LD39020DTPU31R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020DTPU31R, 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 LD39020DTPU31R part is unused and in its original packaging.

Return procedure for LD39020DTPU31R:

1.Submit a request within 90 days.

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

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