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

STMicroelectronics LD39130SPU25R

Name: LD39130SPU25R
Brand: STMicroelectronics
SKU: LD39130SPU25R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39130SPU25R

Manufacturer:: STMicroelectronics

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

Package:: 6-XFDFN

Datasheet:: LD39130SPU25R.pdf

Description:: IC REG LINEAR 2.5V 300MA 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,417

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Product details

Overview

LD39130SPU25R from STMicroelectronics is a 2.5 V fixed-output, 300 mA ultra-low-dropout linear regulator with automatic green mode, 300 mV typical dropout at full load, ±1.0% output voltage accuracy at 25 °C, and 1 µA quiescent current in green mode - designed for power management in battery-powered mobile phones and digital still cameras.

For engineers reviewing the LD39130SPU25R datasheet, LD39130SPU25R pinout, LD39130SPU25R application, or LD39130SPU25R equivalent, key selection criteria include dropout voltage under 300 mA load, green-mode transition thresholds (1–2 mA), thermal shutdown at 160 °C, compatibility with 330 nF ceramic output capacitors, and DFN6 1.2×1.3 mm package footprint constraints.

Technical Context

The LD39130SPU25R integrates a bandgap reference, fast-turn-on op-amp control loop, and auto-switching logic between green mode (ultra-low IQ) and normal mode (fast transient response). Its internal current foldback and thermal protection activate at 50 mA short-circuit current and 160 °C junction temperature, respectively.

Green mode operation is enabled by default on the DFN6 package via internal pull-down on GM pin; it switches to normal mode when load exceeds ~10 mA and reverts below ~1–2 mA. The device supports remote sensing only in adjustable versions - this fixed 2.5 V variant uses internal ADJ reference and omits external resistor divider connections.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 2.5 V ±1.0% at 25 °C - ensures stable core voltage for low-power microcontrollers and image sensors.
Max output current	300 mA guaranteed - sufficient to power baseband processors or camera ISP subsystems without thermal derating at ambient ≤85 °C.
Dropout voltage	300 mV typ. at 300 mA - enables regulation from 2.8 V input down to 2.5 V output, critical for single-cell Li-ion systems.
Quiescent current	1 µA in green mode, 45 µA in normal mode - extends battery life in standby and active states of portable media devices.
Operating temperature	−40 °C to +125 °C junction range - qualified for automotive infotainment and industrial handheld applications.
PSRR	70 dB at 1 kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input.
Output noise	100 µV_RMS (10 Hz–100 kHz) - low enough for analog sensor biasing and RF front-end power domains.

Pinout & Package

LD39130SPU25R is housed in a DFN6 1.2 × 1.3 mm, 0.4 mm pitch package with wettable flanks. Pin 1 (GM) is internally pulled down and enables automatic green mode; Pin 3 (EN) controls logic-level shutdown; Pin 4 (IN) accepts 1.4–5.5 V input; Pin 6 (OUT) delivers regulated 2.5 V.

Pin/Terminal	Circuit Role	Design Meaning
1 (GM)	Auto green mode enable	Low = green mode active (1 µA IQ); high = forced normal mode (45 µA IQ); internal pull-down ensures default green operation.
2 (GND)	Power ground	Common return path for IN, OUT, EN, and GM; must be connected to low-impedance analog ground plane.
3 (EN)	Enable control input	Logic high ≥1 V enables regulator; logic low ≤0.4 V disables output and reduces VIN current to 0.1 µA.
4 (IN)	Input voltage supply	Accepts 1.4–5.5 V DC; requires ≥1 µF ceramic capacitor placed adjacent to pin for stability and transient response.
5 (NC)	No connect	Not bonded in fixed-output version; must remain unconnected and floating per datasheet.
6 (OUT)	Regulated output	Delivers 2.5 V ±1% to load; supports 330 nF–22 µF ceramic capacitors with ESR < 100 mΩ for loop stability.

Key Features

Feature	Design Value
Automatic green mode	Switches between 1 µA (light load) and 45 µA (active load) IQ without external control - eliminates manual mode selection logic.
Internal soft-start	100 µs controlled ramp-up time - prevents inrush current spikes during power-on, eliminating need for external soft-start capacitor.
Output discharge path	100 Ω internal MOSFET between OUT and GND - actively discharges output capacitor when EN = low, preventing residual voltage hold-up.
Ceramic capacitor compatible	Stable with 330 nF minimum C_OUT - enables use of small, low-ESR MLCCs instead of larger tantalum or aluminum electrolytics.
Thermal & current protection	160 °C thermal shutdown with 20 °C hysteresis and 50 mA foldback current limit - protects against sustained overload or PCB overheating.

Applications

Mobile Phone Power Rail

Digital Still Camera Sensor Bias

Use Scenario: Supplying 2.5 V to baseband processor I/O banks and PMIC interface logic in slim smartphone designs.

IC Role / Device Role / Timing Role: Primary low-noise post-regulator after buck converter, delivering clean 2.5 V with fast load transient recovery.

Use Value: 70 dB PSRR at 1 kHz rejects switching noise from upstream DC-DC; 100 µV_RMS noise avoids ADC quantization errors in audio codec interfaces.

Use Scenario: Providing precision 2.5 V bias to CMOS image sensor analog front-end and column ADC circuitry.

IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source enabling accurate pixel readout and correlated double sampling.

Use Value: ±1.0% output tolerance over −40 °C to +85 °C ensures consistent sensor gain calibration; 300 mV dropout allows operation from aging 3.0 V battery rails.

Cordless Phone Base Station

Portable Media Player Audio Codec

Use Scenario: Powering DSP and RF transceiver ICs in battery-operated cordless phone handsets with intermittent transmit bursts.

IC Role / Device Role / Timing Role: Green-mode LDO managing dynamic load profile - idle (1 µA IQ) vs. TX burst (300 mA peak).

Use Value: Automatic mode switching eliminates firmware overhead; 100 µs turn-on time meets fast wake-up requirements for VoIP call initiation.

Use Scenario: Delivering 2.5 V to stereo DAC, headphone amplifier, and flash memory interface in MP3 players.

IC Role / Device Role / Timing Role: System-level power rail stabilizer ensuring consistent audio playback fidelity across battery discharge cycle.

Use Value: 300 mV dropout sustains regulation down to 2.8 V battery voltage; 1 µA green-mode IQ extends playback time by >12% versus standard LDOs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B252MR-G	2.5 V fixed, 300 mA, 250 mV dropout, 1 µA IQ - no green mode; uses external soft-start capacitor.	Lacks auto-load-sensing; requires board space for soft-start cap and lacks output discharge function.	Choose when deterministic startup timing is required and green-mode complexity is unnecessary.
Richtek RT9080-25PU5	2.5 V fixed, 300 mA, 200 mV dropout, 2.5 µA IQ - no green mode; 65 dB PSRR at 1 kHz; no thermal shutdown hysteresis.	Lower dropout but higher IQ and reduced protection robustness; not qualified for automotive temp range.	Prefer for ultra-low-input-voltage systems where 1.6 V min VIN is critical, and extended temperature is not required.

Compared with XC6210B252MR-G and RT9080-25PU5, the LD39130SPU25R uniquely combines green-mode IQ optimization, integrated output discharge, and automotive-grade thermal protection - making it optimal for space-constrained, battery-life-sensitive consumer electronics requiring adaptive power efficiency.

Availability

LD39130SPU25R 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 RoHS-compliant packaging.

Supply support for LD39130SPU25R 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 sensor solutions for automotive, industrial, and consumer markets.

The LD39130S series belongs to ST's high-accuracy, ultra-low-IQ LDO family - engineered specifically for battery-powered portable electronics demanding minimal standby consumption and reliable light-load regulation.

FAQ

What is the minimum input voltage required for stable 2.5 V output at 300 mA?

The LD39130SPU25R requires a minimum input voltage of 2.8 V to maintain 2.5 V output at 300 mA load, based on its 300 mV typical dropout voltage specification. At −40 °C to +125 °C junction temperature, the maximum dropout rises to 350 mV, so 2.85 V input is recommended for worst-case margin.

Can the GM pin be left unconnected in the DFN6 package?

No - Pin 1 (GM) is internally pulled down to GND and must be either grounded or driven high to disable green mode. Leaving it floating risks undefined mode behavior due to noise coupling; ST recommends tying GM to GND if green mode is desired, or to VIN if forced normal mode is needed.

Is an external capacitor required on the EN pin for noise immunity?

No external capacitor is required on the EN pin. The LD39130SPU25R has built-in hysteresis and filtering; its enable threshold is specified at 0.4 V (low) and 1.0 V (high) over full temperature range, with input leakage <100 nA - making it robust against typical PCB-level noise without added capacitance.

Does the LD39130SPU25R support reverse current blocking?

No - the LD39130SPU25R does not integrate reverse current blocking. When input voltage falls below output voltage (e.g., during battery swap), current can flow backward from OUT to IN through the pass transistor body diode. An external Schottky diode in series with IN is required if reverse current must be prevented.

LD39130SPU25R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 6-XFDFN

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):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 300mA (Typ)

Current - Output:: 300mA

Current - Quiescent (Iq):: 45 µA

Current - Supply (Max):: -

PSRR:: 70dB ~ 65dB (1kHz ~ 10kHz)

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:: 6-DFN (1.2x1.3)

LD39130SPU25R FAQ

1.How can I place an order for LD39130SPU25R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39130SPU25R 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 LD39130SPU25R reliable?

The price and inventory of LD39130SPU25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39130SPU25R is usually 5 days.

3.What payment methods are accepted for LD39130SPU25R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39130SPU25R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39130SPU25R?

LD39130SPU25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39130SPU25R 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 LD39130SPU25R?

For technical support, including LD39130SPU25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39130SPU25R requirements.

6.How does Aetrix verify that LD39130SPU25R is sourced from the original manufacturer or authorized distributors?

All LD39130SPU25R 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 LD39130SPU25R meets industry standards.

7.What is the process for return or replacement of LD39130SPU25R?

All LD39130SPU25R units undergo pre-shipment inspection (PSI). If there is an issue with LD39130SPU25R, 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 LD39130SPU25R part is unused and in its original packaging.

Return procedure for LD39130SPU25R:

1.Submit a request within 90 days.

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

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