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

STMicroelectronics LD39030ADTPU28R

Name: LD39030ADTPU28R
Brand: STMicroelectronics
SKU: LD39030ADTPU28R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39030ADTPU28R

Manufacturer:: STMicroelectronics

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

Package:: 4-XDFN Exposed Pad

Datasheet:: LD39030ADTPU28R.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,852

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Product details

Overview

LD39030ADTPU28R from STMicroelectronics is a 300 mA ultra-low-dropout linear voltage regulator delivering 2.8 V output with ±0.5 % accuracy at 25 °C, 300 mV typical dropout at 300 mA load, and 20 µA quiescent current at no load. It operates from 1.5 V to 5.5 V input and features logic-controlled shutdown, internal soft-start, and optional output discharge - optimized for space-constrained battery-powered systems such as mobile phones and digital still cameras.

For engineers reviewing the LD39030ADTPU28R datasheet, LD39030ADTPU28R pinout, LD39030ADTPU28R application, or LD39030ADTPU28R equivalent, key selection criteria include output accuracy tolerance, dropout behavior under 300 mA load, thermal performance in DFN4 1×1 package, EN pin logic thresholds, and compatibility with 0.47 µF ceramic output capacitors.

Technical Context

The LD39030ADTPU28R implements a PMOS pass transistor architecture enabling ultra-low dropout (330 mV max at 300 mA, −40 °C to 125 °C), high PSRR (80 dB @ 1 kHz), and low noise (45 µV_RMS). Its internal soft-start limits inrush current without external components, and the integrated output discharge MOSFET (RON = 100 Ω) actively discharges C_OUT during shutdown.

Stabilized with ≥0.47 µF ceramic output capacitance and requiring only 1 µF input capacitor, it maintains loop stability across −40 °C to 125 °C junction temperature. The EN pin accepts logic-level control (V_IL ≤ 0.4 V, V_IH ≥ 1 V) and draws just 100 nA input current, supporting ultra-low-power system sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.8 V fixed, ±0.5 % accuracy at 25 °C ensures tight regulation for sensitive analog/digital rails
Max Output Current	300 mA guaranteed - supports moderate-power subsystems like camera ISPs or RF front-ends
Dropout Voltage	330 mV max at 300 mA and full temperature range - enables operation down to 3.13 V input for 2.8 V rail
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 Capacitor	Compatible with 0.47 µF ceramic (X5R/X7R) - eliminates need for bulky tantalum or electrolytic caps
Enable Threshold	V_IL ≤ 0.4 V, V_IH ≥ 1 V - interfaces directly with 1.8 V/3.3 V GPIO without level-shifting

Pinout & Package

Supplied in STMicroelectronics' DFN4 1×1 mm package (0.4 mm height, thermal pad connected to GND), offering minimal PCB footprint and enhanced thermal dissipation (R_thJA = 250 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1: OUT	Regulated output voltage node	Delivers stable 2.8 V; requires 0.47–22 µF ceramic capacitor with ESR < 15 Ω for stability
2: GND	Analog and power ground reference	Common return for IN, OUT, and EN; thermal pad must be soldered to PCB GND plane
3: EN	Active-high enable control input	Drives device into <0.1 µA shutdown when pulled low; 100 nA leakage preserves battery integrity
4: IN	Unregulated input supply connection	Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed adjacent to pin for transient immunity

Key Features

Feature	Design Value
Ultra-low dropout	330 mV max at 300 mA over −40 °C to 125 °C - sustains regulation with minimal headroom loss
Output discharge	Integrated 100 Ω NMOS between OUT and GND - discharges output cap within microseconds upon EN deassertion
Soft-start	100 µs controlled ramp-up - prevents inrush current spikes without external timing components
Low-noise operation	45 µV_RMS (10 Hz–100 kHz) - suitable for powering ADC references and RF synthesizers
Robust protection	Internal current limiting and thermal shutdown at 160 °C with 20 °C hysteresis - prevents damage during overload

Applications

Mobile Phone Power Rail

Digital Still Camera Core Supply

Use Scenario: Providing clean 2.8 V bias to image signal processors (ISPs) and CMOS sensors in compact smartphones.

IC Role / Device Role / Timing Role: Low-noise post-regulator after primary buck converter; ensures stable voltage during rapid sensor wake/sleep transitions.

Use Value: 45 µV_RMS noise and 80 dB PSRR prevent corruption of analog pixel data; 100 µs soft-start avoids frame drop on power-up.

Use Scenario: Supplying 2.8 V to autofocus actuators and flash LED drivers in portable digital cameras.

IC Role / Device Role / Timing Role: Load-switch-capable LDO with fast EN response (<100 µs turn-on) for precise timing-critical actuator control.

Use Value: 300 mA capability drives dual-phase AF coils; output discharge clears residual voltage before next focus cycle.

Tablet SoC I/O Domain

Cordless Phone Baseband IC

Use Scenario: Regulating 2.8 V for application processor I/O banks in thin tablets with constrained board area.

IC Role / Device Role / Timing Role: Space-optimized point-of-load regulator in DFN4 1×1 package; co-located near SoC BGA balls.

Use Value: 0.47 µF ceramic compatibility reduces layout area by >60% vs. traditional 10 µF tantalum solutions.

Use Scenario: Powering 2.8 V baseband ASICs and audio codecs in battery-operated cordless handsets.

IC Role / Device Role / Timing Role: Ultra-low-I_Q regulator maintaining RTC and memory retention during deep sleep.

Use Value: 0.03 µA shutdown current extends shelf life; ±0.5 % accuracy ensures consistent codec bias across temperature.

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	2.8 V fixed, ±2 % accuracy, 150 mV dropout @ 300 mA, no output discharge	Lacks active discharge and tighter accuracy; lower PSRR (65 dB @ 1 kHz)	Preferred where cost sensitivity outweighs precision and fast discharge requirements
Richtek RT9013-28GB	2.8 V fixed, ±2 % accuracy, 250 mV dropout @ 300 mA, 25 µA I_Q, no discharge	Higher quiescent current and no discharge MOSFET; requires ≥1 µF C_OUT	Suitable for non-critical rails where 0.03 µA shutdown is unnecessary

Compared with XC6210B282MR-G and RT9013-28GB, the LD39030ADTPU28R delivers superior accuracy (±0.5 % vs. ±2 %), lower shutdown current (0.03 µA vs. ≥1 µA), and integrated discharge - making it optimal for high-fidelity, battery-sensitive applications demanding rapid state transitions.

Availability

LD39030ADTPU28R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless phone systems requiring stable component supply, long-term lifecycle support, and AEC-Q200–compatible thermal robustness.

Supply support for LD39030ADTPU28R 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 specializing in power management, microcontrollers, and analog ICs, with manufacturing aligned to ISO 9001 and IATF 16949 standards.

The LD39030 series belongs to ST's high-accuracy, ultra-low-I_Q LDO portfolio designed specifically for space- and energy-constrained portable electronics requiring precision voltage regulation and fast dynamic response.

FAQ

What is the minimum output capacitance required for stable operation?

The LD39030ADTPU28R is stable with as little as 0.47 µF ceramic output capacitance (X5R/X7R dielectric), verified across −40 °C to 125 °C. This value satisfies ESR and capacitance stability requirements per Figure 17 of DS11386, eliminating need for larger or higher-ESR capacitors.

Does the LD39030ADTPU28R include output discharge functionality?

Yes - the "D" in the order code (LD39030DTPU28R) indicates integrated output discharge MOSFET (RON = 100 Ω), activated automatically when EN is pulled low. This feature rapidly discharges the output capacitor, preventing unintended downstream wake-up or latch-up.

What is the maximum allowable input voltage?

The absolute maximum input voltage is 7 V, but the recommended operating range is 1.5 V to 5.5 V per datasheet Section 5. Exceeding 5.5 V risks violating safe operating area limits, especially under high ambient temperature or heavy load conditions.

How does thermal performance compare between DFN4 1×1 and larger packages?

In DFN4 1×1, R_thJA is 250 °C/W (no PCB copper pour). With standard 2-layer board and thermal pad soldered to 1 cm² GND plane, junction-to-ambient resistance drops to ~60 °C/W - enabling 300 mA continuous operation up to 85 °C ambient without derating.

LD39030ADTPU28R 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)

LD39030ADTPU28R FAQ

1.How can I place an order for LD39030ADTPU28R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39030ADTPU28R 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 LD39030ADTPU28R reliable?

The price and inventory of LD39030ADTPU28R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030ADTPU28R is usually 5 days.

3.What payment methods are accepted for LD39030ADTPU28R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030ADTPU28R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39030ADTPU28R?

LD39030ADTPU28R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39030ADTPU28R 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 LD39030ADTPU28R?

For technical support, including LD39030ADTPU28R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030ADTPU28R requirements.

6.How does Aetrix verify that LD39030ADTPU28R is sourced from the original manufacturer or authorized distributors?

All LD39030ADTPU28R 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 LD39030ADTPU28R meets industry standards.

7.What is the process for return or replacement of LD39030ADTPU28R?

All LD39030ADTPU28R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030ADTPU28R, 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 LD39030ADTPU28R part is unused and in its original packaging.

Return procedure for LD39030ADTPU28R:

1.Submit a request within 90 days.

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

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