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

STMicroelectronics LD39030DTPU28R

Name: LD39030DTPU28R
Brand: STMicroelectronics
SKU: LD39030DTPU28R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39030DTPU28R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39030DTPU28R.pdf

Description:: IC REG LINEAR 2.8V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:103

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Product details

Overview

LD39030DTPU28R from STMicroelectronics is a 300 mA ultra-low-dropout linear regulator IC delivering fixed 2.8 V output with ±2.0 % accuracy at 25 °C, 300 mV typical dropout at 300 mA load, 20 µA typical quiescent current at no load, and logic-controlled shutdown. It operates from 1.5–5.5 V input and targets space-constrained, battery-powered systems requiring stable low-noise voltage regulation.

For engineers reviewing the LD39030DTPU28R datasheet, LD39030DTPU28R pinout, LD39030DTPU28R application, or LD39030DTPU28R equivalent, key selection criteria include dropout performance at full load, shutdown current (<0.1 µA), PSRR (80 dB @1 kHz), ceramic capacitor compatibility (≥0.47 µF), and DFN4 1×1 thermal pad grounding requirements.

Technical Context

The LD39030DTPU28R implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across 1 kHz–100 kHz. Its internal soft-start limits inrush current without external components, and the integrated output discharge MOSFET (enabled in this variant) actively discharges COUT during shutdown.

Stability is guaranteed with ≥0.47 µF ceramic output capacitance and X5R/X7R dielectrics; the control loop tolerates ESR down to ~10 mΩ per Figure 17. Thermal protection triggers at 160 °C with 20 °C hysteresis, and the device sustains operation from –40 °C to +125 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2.0 % at 25 °C - ensures precise biasing for 2.8 V I/O rails in portable SoCs
Max Output Current	300 mA guaranteed - supports moderate-power RF modules or sensor subsystems
Dropout Voltage	330 mV max at 300 mA, –40 °C to 125 °C - enables regulation from 3.13 V input in brownout conditions
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 adjacent DC-DC converters
Output Noise	45 µV_RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references
Enable Threshold	V_IL ≤ 0.4 V, V_IH ≥ 1 V - compatible with 1.8 V/3.3 V GPIO without level-shifting

Pinout & Package

LD39030DTPU28R is housed in a thermally enhanced DFN4 1×1 mm package with exposed thermal pad (GND). The pad must be soldered to a PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 OUT	Regulated output node	Delivers 2.8 V to load; requires ≥0.47 µF ceramic capacitor directly adjacent to pin
2 GND	Analog and power ground reference	Common return for input/output capacitors and internal circuitry; connects to thermal pad
3 EN	Active-high enable control	Pull ≥1 V to activate; ≤0.4 V disables regulator and engages output discharge MOSFET
4 IN	Unregulated input supply	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed within 2 mm of pin

Key Features

Feature	Design Value
Ultra-low dropout	300 mV typ. at 300 mA - maintains regulation under tight input margins (e.g., single Li-ion cell at end-of-discharge)
Logic-controlled shutdown	EN pin reduces total current to 0.03 µA typ. - enables system-level power gating with minimal leakage
Integrated output discharge	100 Ω on-resistance MOSFET - discharges output capacitor in <1 ms upon disable, preventing residual voltage hold-up
Ceramic capacitor stability	Stable with 0.47–22 µF X5R/X7R COUT - eliminates need for tantalum or electrolytic capacitors, reducing BOM cost and footprint
Internal soft-start	100 µs turn-on time - prevents inrush current spikes that could destabilize shared input rails

Applications

Mobile Phone Power Management

Digital Still Camera Sensor Bias

Use Scenario: Regulating 2.8 V supply for CMOS image sensor I/O and analog front-end in compact smartphone modules.

IC Role / Device Role / Timing Role: Primary LDO for sensor rail, providing low-noise, fast-transient response during auto-exposure bursts.

Use Value: 45 µV_RMS noise and 80 dB PSRR prevent image banding; 300 mV dropout allows operation down to 3.1 V battery voltage.

Use Scenario: Powering high-resolution CCD/CMOS sensor analog blocks in DSLR and mirrorless cameras.

IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source for precision ADC reference and pixel readout circuitry.

Use Value: ±2.0 % output tolerance and <0.2 %/V line regulation ensure consistent sensor gain calibration across battery discharge.

Tablet Application Processor Core Rail

Cordless Phone Baseband IC Supply

Use Scenario: Delivering clean 2.8 V to application processor I/O banks in thin-profile tablets with dual-cell Li-ion batteries.

IC Role / Device Role / Timing Role: Secondary LDO post-regulator, filtering ripple from main buck converter and supplying configurable I/O voltage.

Use Value: 55 dB PSRR at 100 kHz attenuates high-frequency switching noise; DFN4 1×1 footprint saves >60 % area vs. SOT-23.

Use Scenario: Providing regulated 2.8 V to DECT baseband ICs and RF transceivers in battery-backed cordless phone handsets.

IC Role / Device Role / Timing Role: Standby-mode LDO with sub-1 µA shutdown current, enabling multi-week shelf life on primary alkaline cells.

Use Value: 0.03 µA standby current extends battery life by >3× vs. standard LDOs; thermal shutdown protects during ambient temperature excursions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B282MR-G	280 mA max output; 250 mV dropout at 200 mA; no integrated output discharge	Lacks active COUT discharge - requires external circuitry for rapid rail collapse	Preferred where board space permits discrete discharge FET and lower cost is critical
Richtek RT9080AL-28GJ6F	500 mA output; 200 mV dropout at 300 mA; 35 µA quiescent current; no thermal shutdown	Higher current capability but lacks overtemperature protection - unsuitable for sealed enclosures	Chosen when higher load margin is needed and thermal environment is tightly controlled

Compared with XC6210B282MR-G and RT9080AL-28GJ6F, LD39030DTPU28R uniquely combines guaranteed 300 mA output, integrated discharge, thermal shutdown, and industry-leading 20 µA quiescent current - making it optimal for space- and energy-constrained portable designs where reliability and feature integration are prioritized over raw current headroom.

Availability

LD39030DTPU28R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, cordless phones, and portable media players requiring stable component supply with long-term lifecycle support.

Supply support for LD39030DTPU28R 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 devices for industrial, automotive, and consumer markets.

LD39030 belongs to ST's high-accuracy, ultra-low-I_Q LDO family targeting battery-powered portable electronics where minimal power loss, small footprint, and robust protection features are essential design requirements.

FAQ

What is the minimum output capacitance required for stable operation?

The LD39030DTPU28R is stable with a minimum effective output capacitance of 220 nF, but ST recommends ≥0.47 µF ceramic (X5R/X7R) for guaranteed stability across temperature, input voltage, and load variations. This value satisfies the stability region shown in Figure 17 of DS11386 Rev 5, ensuring robust transient response and no oscillation under worst-case ESR conditions.

Does LD39030DTPU28R include output discharge functionality?

Yes - the "D" suffix in LD39030DTPU28R indicates the version with integrated output discharge MOSFET (RON = 100 Ω). When EN is pulled low, this MOSFET actively discharges the output capacitor to GND, collapsing VOUT rapidly. This feature is confirmed in Section 6.2 and Table 7 of the datasheet, distinguishing it from non-"D" variants like LD39030PU28R.

What is the maximum allowable input voltage and what happens beyond that limit?

The absolute maximum input voltage is 7 V (per Table 2), but continuous operation above 5.5 V violates the recommended operating conditions and risks permanent damage. Operation at 5.5 V is permitted only if thermal limits (T_J ≤ 125 °C) are maintained; exceeding 5.5 V even briefly may trigger latch-up or gate oxide breakdown due to internal PMOS stress.

Can LD39030DTPU28R be used with aluminum polymer capacitors instead of ceramic?

No - the control loop is optimized for low-ESR ceramic capacitors (0.47–22 µF, X5R/X7R). Aluminum polymer capacitors typically exhibit higher ESR and less stable capacitance vs. temperature, placing them outside the stability region in Figure 17. Using them risks oscillation, poor load transient response, or startup failure, as confirmed in Section 6.3 of DS11386 Rev 5.

LD39030DTPU28R 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):: 0.33V @ 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)

LD39030DTPU28R FAQ

1.How can I place an order for LD39030DTPU28R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39030DTPU28R 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 LD39030DTPU28R reliable?

The price and inventory of LD39030DTPU28R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030DTPU28R is usually 5 days.

3.What payment methods are accepted for LD39030DTPU28R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030DTPU28R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39030DTPU28R?

LD39030DTPU28R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39030DTPU28R 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 LD39030DTPU28R?

For technical support, including LD39030DTPU28R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030DTPU28R requirements.

6.How does Aetrix verify that LD39030DTPU28R is sourced from the original manufacturer or authorized distributors?

All LD39030DTPU28R 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 LD39030DTPU28R meets industry standards.

7.What is the process for return or replacement of LD39030DTPU28R?

All LD39030DTPU28R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030DTPU28R, 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 LD39030DTPU28R part is unused and in its original packaging.

Return procedure for LD39030DTPU28R:

1.Submit a request within 90 days.

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

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