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

STMicroelectronics LD39030DTPU18R

Name: LD39030DTPU18R
Brand: STMicroelectronics
SKU: LD39030DTPU18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39030DTPU18R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39030DTPU18R.pdf

Description:: IC REG LINEAR 1.8V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,922

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Product details

Overview

LD39030DTPU18R from STMicroelectronics is a 300 mA ultra-low-dropout linear voltage regulator delivering 1.8 V output with ±2.0 % accuracy at 25 °C, 300 mV typical dropout at 300 mA, 20 µA quiescent current at no load, and logic-controlled shutdown. It operates from 1.5–5.5 V input and is stabilized with 0.47 µF ceramic output capacitance in DFN4 1×1 package-designed for space-constrained, battery-powered mobile and portable systems.

For engineers reviewing the LD39030DTPU18R datasheet, LD39030DTPU18R pinout, LD39030DTPU18R application, or LD39030DTPU18R equivalent, key selection criteria include dropout voltage under 300 mA load, shutdown current below 0.1 µA, PSRR of 80 dB @ 1 kHz, thermal shutdown at 160 °C, and compatibility with low-ESR ceramic capacitors down to 0.47 µF.

Technical Context

The LD39030DTPU18R integrates an internal soft-start circuit limiting inrush current without external components, and an optional output discharge MOSFET activated during shutdown to rapidly deplete VOUT capacitance. Its bandgap reference and error amplifier deliver tight output regulation across –40 °C to 125 °C junction temperature.

It uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR up to 100 kHz. The EN pin provides TTL/CMOS-compatible logic control (low = shutdown, high = active), with enable threshold specified at 0.4 V (low) and 1 V (high) over full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.8 V fixed, ±2.0 % tolerance at 25 °C - ensures stable core/sensor rail in portable devices
Max Output Current	300 mA guaranteed - supports moderate-power RF, audio, or imaging subsystems
Dropout Voltage	330 mV max at 300 mA, –40 °C to 125 °C - enables operation from single-cell Li-ion or 2xAA alkaline
Quiescent Current	20 µA typ. at no load; 0.03 µA typ. in shutdown - extends battery life in always-on standby modes
PSRR	80 dB @ 1 kHz, 55 dB @ 100 kHz - suppresses switching noise from DC-DC converters feeding its input
Output Noise	45 µV_RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog/RF circuits
Operating Temp	–40 °C to 125 °C junction - qualified for automotive cabin and industrial edge environments

Pinout & Package

Delivered in STMicroelectronics' DFN4 1×1 mm, 0.4 mm height, thermally enhanced package with exposed thermal pad connected to GND. Pin pitch is 0.65 mm; recommended footprint per Figure 29 (DS11386 Rev 5, p.16).

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Regulated output voltage node	Supplies 1.8 V to load; requires ≥0.47 µF ceramic capacitor to ground for stability
2 (GND)	Analog and power ground reference	Common return for input/output capacitors and thermal pad; must be low-impedance PCB plane
3 (EN)	Active-high enable logic input	Drives internal regulator; <0.4 V disables device, <0.1 µA total supply current in shutdown
4 (IN)	Unregulated input voltage source	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed adjacent to pin
Thermal Pad	Internal die thermal connection	Must be soldered to GND copper pour on PCB for R_thJA = 250 °C/W and thermal shutdown margin

Key Features

Feature	Design Value
Ultra-low dropout	330 mV max at full 300 mA load enables use with weak or aging batteries
Logic-controlled shutdown	EN pin draws <100 nA; reduces total system current to <0.1 µA when inactive
Integrated soft-start	100 µs turn-on time limits inrush current without external RC network
Output discharge function	On-chip MOSFET discharges C_OUT rapidly upon disable - prevents residual voltage hold-up
Ceramic capacitor compatible	Stable with 0.47–22 µF X5R/X7R ceramics - eliminates need for tantalum or electrolytic

Applications

Mobile Phone Power Rail

Digital Still Camera Sensor Bias

Use Scenario: Supplying 1.8 V to baseband processor I/O or memory interface in slim smartphone designs.

IC Role / Device Role / Timing Role: Primary LDO for noise-sensitive digital domain requiring low ripple and fast transient response.

Use Value: 45 µV_RMS output noise and 80 dB PSRR prevent bit errors during high-speed data transfer.

Use Scenario: Providing clean 1.8 V bias to CMOS image sensor analog front-end in compact DSC modules.

IC Role / Device Role / Timing Role: Low-noise post-regulator after buck converter, with discharge function to reset sensor between frames.

Use Value: Output discharge MOSFET clears residual charge in <1 ms, eliminating ghosting artifacts in burst capture mode.

Tablet SoC Core Logic

Cordless Phone Baseband IC

Use Scenario: Delivering regulated 1.8 V to application processor core logic in battery-powered tablets.

IC Role / Device Role / Timing Role: High-accuracy, low-quiescent-current LDO supporting dynamic voltage scaling (DVS) states.

Use Value: ±2.0 % output tolerance and <20 µA IQ ensure consistent timing margins across battery discharge cycles.

Use Scenario: Powering 1.8 V DSP and codec in DECT cordless phone handsets with multi-day standby.

IC Role / Device Role / Timing Role: Standby-optimized LDO with sub-0.1 µA shutdown current and fast enable response.

Use Value: 100 µs turn-on time synchronizes cleanly with wake-up interrupt, minimizing latency in voice call initiation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B182MR-G	Same 1.8 V output, 300 mA rating, but 250 mV dropout (typ), 25 µA IQ, no output discharge	Lacks integrated discharge MOSFET; requires external circuit for rapid VOUT decay	Preferred where board area allows discrete discharge solution and lower dropout is critical
Richtek RT9013-18GB	1.8 V, 300 mA, 350 mV dropout (max), 25 µA IQ, 65 dB PSRR @ 1 kHz, no discharge	Lower PSRR and no discharge function; wider operating temp (–40 °C to 85 °C only)	Suitable for cost-sensitive consumer applications where full industrial temp range is not required

Compared with XC6210B182MR-G and RT9013-18GB, the LD39030DTPU18R uniquely combines 125 °C operation, integrated output discharge, and 80 dB PSRR-making it optimal for high-reliability portable systems demanding fast state transitions and robust noise immunity.

Availability

LD39030DTPU18R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, tablets, and cordless phone systems requiring stable component supply with long-term manufacturability and automotive-grade thermal resilience.

Supply support for LD39030DTPU18R 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, sensors, and analog chips for industrial, automotive, and consumer markets.

The LD39030 belongs to ST's high-accuracy, ultra-low-IQ LDO family targeting battery-powered portable electronics-emphasizing minimal footprint, thermal robustness, and seamless integration with ceramic capacitors.

FAQ

What is the minimum output capacitance required for stable operation?

The LD39030DTPU18R is stable with as little as 220 nF effective output capacitance, but ST specifies a minimum of 0.47 µF ceramic (X5R/X7R) to guarantee stability across temperature, input voltage, and load variations per Figure 17. Using smaller values risks oscillation under worst-case conditions.

Does LD39030DTPU18R include output discharge functionality?

Yes-the 'D' in the order code (LD39030DTPU18R) explicitly denotes inclusion of the internal output discharge MOSFET. When EN is pulled low, this MOSFET connects VOUT to GND, discharging the output capacitor with R_ON ≈ 100 Ω, enabling rapid rail collapse.

Can LD39030DTPU18R operate with input voltage below 1.8 V?

No-it requires VIN ≥ VOUT + dropout voltage. With 1.8 V output and 330 mV max dropout, minimum functional input is 2.13 V. Operation below 1.5 V input is prohibited per absolute maximum ratings (Table 2), and regulation fails below ~2.1 V.

How does thermal protection behave during overload?

The LD39030DTPU18R features internal thermal shutdown at 160 °C junction temperature with 20 °C hysteresis. When triggered, it disables the pass element until die cools to ~140 °C, then auto-resumes-preventing permanent damage during sustained overload or poor PCB heatsinking.

LD39030DTPU18R 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):: 1.8V

Voltage - Output (Max):: -

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

Current - Output:: 300mA

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)

LD39030DTPU18R FAQ

1.How can I place an order for LD39030DTPU18R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39030DTPU18R 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 LD39030DTPU18R reliable?

The price and inventory of LD39030DTPU18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030DTPU18R is usually 5 days.

3.What payment methods are accepted for LD39030DTPU18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030DTPU18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39030DTPU18R?

LD39030DTPU18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39030DTPU18R 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 LD39030DTPU18R?

For technical support, including LD39030DTPU18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030DTPU18R requirements.

6.How does Aetrix verify that LD39030DTPU18R is sourced from the original manufacturer or authorized distributors?

All LD39030DTPU18R 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 LD39030DTPU18R meets industry standards.

7.What is the process for return or replacement of LD39030DTPU18R?

All LD39030DTPU18R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030DTPU18R, 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 LD39030DTPU18R part is unused and in its original packaging.

Return procedure for LD39030DTPU18R:

1.Submit a request within 90 days.

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

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