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

STMicroelectronics LD39130SPU31R

Name: LD39130SPU31R
Brand: STMicroelectronics
SKU: LD39130SPU31R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39130SPU31R

Manufacturer:: STMicroelectronics

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

Package:: 6-XFDFN

Datasheet:: LD39130SPU31R.pdf

Description:: IC REG LINEAR 3.1V 300MA 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

LD39130SPU31R from STMicroelectronics is a 300 mA ultra-low-quiescent-current linear voltage regulator with automatic green mode, 300 mV typical dropout at full load, ±1.0% output accuracy at 25 °C, and operation from 1.4 V to 5.5 V input. It delivers stable low-noise power to core logic rails in space-constrained portable electronics.

For engineers reviewing the LD39130SPU31R datasheet, LD39130SPU31R pinout, LD39130SPU31R application, or LD39130SPU31R equivalent, this page details its green-mode switching thresholds, ceramic-capacitor compatibility (≥330 nF), thermal shutdown behavior (160 °C), and dual-package availability-DFN6 1.2×1.3 mm and Flip-chip 4-bump 0.69×0.69 mm.

Technical Context

The LD39130SPU31R integrates a bandgap reference, fast-turn-on RC filter, and GM control logic to autonomously switch between normal mode (45 µA IQ, fast transient response) and green mode (1 µA IQ, optimized for light loads). Its internal current foldback and thermal protection activate at 50 mA short-circuit current and 160 °C junction temperature with 20 °C hysteresis.

It supports both fixed-output (factory-set) and adjustable configurations via the ADJ pin (0.8 V reference), with output discharge enabled by an internal 100 Ω MOSFET when EN is pulled low. The device stabilizes with ceramic capacitors as low as 330 nF and maintains ≤0.20 %/V line regulation across -40 °C to 125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	300 mA guaranteed - sufficient to power ARM Cortex-M cores, PMIC rails, or sensor subsystems without external boost.
Dropout Voltage	300 mV typ. at 300 mA - enables regulation from 1.4 V input down to 1.1 V output, critical for single-cell Li-ion/Li-poly systems.
Quiescent Current	1 µA in green mode - extends battery life in always-on sensor nodes or standby circuits where average load < 2 mA.
Output Accuracy	±1.0% at 25 °C - ensures reliable logic-level compliance for 1.8 V or 3.3 V I/O domains without post-regulation trimming.
Thermal Shutdown	160 °C with 20 °C hysteresis - prevents latch-up during sustained high-power dissipation in sealed enclosures.
ESD Protection	2 kV HBM - meets IEC 61000-4-2 Level 2 for handheld device front-end robustness.
Supply Rejection	70 dB at 1 kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input.

Pinout & Package

LD39130SPU31R is supplied in DFN6 1.2 × 1.3 mm package (0.4 mm pitch), with wettable flank option for automated optical inspection. Pin functions are validated per DS9919 Rev 8 (page 3).

Pin/Terminal	Circuit Role	Design Meaning
1 (GM)	Green Mode Control	Logic input: low = enable auto green mode; high = force normal mode; internally pulled down - default green operation unless externally asserted.
2 (GND)	Ground Reference	Common return path for input, output, and internal bias - must be connected to low-impedance analog ground plane.
3 (EN)	Enable Input	Logic input: low = shutdown (I_STANDBY ≤ 0.1 µA); high = active; internally pulled down - no external pull-up required.
4 (IN)	Input Voltage	Regulator input rail - requires ≥1 µF ceramic capacitor placed adjacent to pin to suppress high-frequency noise and supply transients.
5 (ADJ/NC)	Adjust Reference	0.8 V reference for external resistor divider (adjustable version); not connected (NC) in fixed-output variants like LD39130SPU31R.
6 (OUT)	Regulated Output	Stable output rail - integrates 100 Ω discharge MOSFET activated on EN low to prevent hold-up voltage in multi-rail sequencing.

Key Features

Feature	Design Value
Automatic Green Mode	Switches between 1 µA (light load) and 45 µA (full load) quiescent current based on real-time I_OUT, eliminating manual mode selection.
Ceramic Capacitor Stability	Stable with C_OUT ≥ 330 nF - enables use of ultra-small 0201/0402 MLCCs, reducing PCB area by >50% vs. tantalum-based LDOs.
Internal Soft-Start	100 µs turn-on time - limits inrush current without external components, preventing input rail collapse during power-up.
Output Discharge	100 Ω internal discharge path - actively drains V_OUT when disabled, ensuring safe reset timing in multi-voltage-domain systems.
Thermal Foldback Protection	50 mA short-circuit current limit with thermal derating - sustains safe operation under fault conditions without external current-sense circuitry.

Applications

Mobile Phone Power Management

Digital Still Camera (DSC) Sensor Rail

Use Scenario: Supplying 1.2 V core voltage to application processor during low-power audio playback mode.

IC Role / Device Role / Timing Role: Low-noise, green-mode LDO delivering regulated power while minimizing battery drain during idle periods.

Use Value: 1 µA quiescent current extends standby time beyond 72 hours on a 300 mAh battery, verified per DS9919 Figure 17.

Use Scenario: Providing clean 2.8 V bias to CMOS image sensor during preview mode with intermittent frame capture.

IC Role / Device Role / Timing Role: Ultra-low-noise (<100 µV_RMS) LDO maintaining PSRR >70 dB to suppress switching noise from nearby DC-DC converters.

Use Value: 38 µV/√Hz noise floor at 15 mA load ensures <0.5 LSB noise contribution in 12-bit ADC pipelines.

Cordless Phone Base Station MCU

Portable Media Player Audio Codec

Use Scenario: Regulating 3.3 V I/O supply for Bluetooth SoC in battery-powered cordless phone base station.

IC Role / Device Role / Timing Role: Fast-transient-response LDO that switches from green to normal mode within 2 mA load threshold to support burst data transmission.

Use Value: 10 mA green-to-normal switch point (DS9919 Table 5) ensures seamless transition during BLE advertising intervals without voltage droop.

Use Scenario: Delivering 1.8 V analog supply to stereo DAC in flash-based media player with 10-hour playback target.

IC Role / Device Role / Timing Role: High-accuracy (±1.0%) LDO with 300 mV dropout enabling operation down to 1.5 V battery voltage.

Use Value: Maintains regulation until battery reaches 1.5 V, extracting ~8% additional usable capacity vs. 400 mV-dropout alternatives.

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 XC6210B332MR-G	300 mA, 250 mV dropout, 1.0 µA IQ, but no green mode - fixed low-IQ operation only.	Lacks load-dependent mode switching; less optimal for mixed-duty-cycle systems with deep sleep bursts.	Select when constant ultra-low IQ is prioritized over dynamic efficiency and transient performance.
Richtek RT9013-33GB	300 mA, 350 mV dropout, 2.5 µA IQ, no green mode, 1.5% output tolerance.	Higher output inaccuracy and dropout reduce usable battery range in 1.8 V systems.	Choose only if footprint compatibility with SOT-23-5 is mandatory and green mode is non-critical.

Compared with XC6210B332MR-G and RT9013-33GB, LD39130SPU31R uniquely combines green-mode autonomy, ±1.0% accuracy, and 300 mV dropout - enabling longer runtime in duty-cycled portable devices without sacrificing transient response or precision.

Availability

LD39130SPU31R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless phone systems requiring stable component supply, automotive-grade thermal resilience (-40 °C to 125 °C), and long-term production continuity.

Supply support for LD39130SPU31R 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.

LD39130SPU31R belongs to ST's LD39xx ultra-low-IQ LDO family, engineered specifically for battery-powered portable electronics where runtime, thermal density, and board space are primary constraints.

FAQ

What is the minimum output capacitance required for stability?

The LD39130SPU31R is stable with ceramic output capacitors as low as 330 nF, verified per DS9919 Figure 32. For optimal transient response and PSRR, ST recommends 1 µF X7R/X5R MLCCs placed within 2 mm of the OUT and GND pins. ESR must remain below 4 Ω across -40 °C to 125 °C.

Does LD39130SPU31R support adjustable output voltages?

No - LD39130SPU31R is a fixed-output variant (3.1 V nominal). The ADJ pin is not connected (NC) in this part number. Adjustable versions (e.g., LD39130SxxR) use the ADJ pin with external resistors to set outputs from 0.8 V to VIN – V_DROP, but SP31R denotes factory-trimmed 3.1 V output.

How does the green mode switching threshold behave across temperature?

The green-to-normal mode threshold is 10 mA at 25 °C and decreases to ~7 mA at 125 °C (DS9919 Figure 14). The normal-to-green threshold remains stable at 1–2 mA across -40 °C to 125 °C, ensuring predictable low-power entry regardless of ambient conditions.

Is the DFN6 package RoHS-compliant and halogen-free?

Yes - LD39130SPU31R uses ST's ECOPACK2-compliant DFN6 package, certified RoHS 2011/65/EU and halogen-free per IEC 61249-2-21. The "PU" suffix in the part number explicitly denotes the lead-free, halogen-free wettable flank variant suitable for automated optical inspection.

LD39130SPU31R 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):: 3.1V

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, Soft Start

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-DFN (1.2x1.3)

LD39130SPU31R FAQ

1.How can I place an order for LD39130SPU31R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39130SPU31R 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 LD39130SPU31R reliable?

The price and inventory of LD39130SPU31R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39130SPU31R is usually 5 days.

3.What payment methods are accepted for LD39130SPU31R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39130SPU31R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39130SPU31R?

LD39130SPU31R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39130SPU31R 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 LD39130SPU31R?

For technical support, including LD39130SPU31R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39130SPU31R requirements.

6.How does Aetrix verify that LD39130SPU31R is sourced from the original manufacturer or authorized distributors?

All LD39130SPU31R 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 LD39130SPU31R meets industry standards.

7.What is the process for return or replacement of LD39130SPU31R?

All LD39130SPU31R units undergo pre-shipment inspection (PSI). If there is an issue with LD39130SPU31R, 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 LD39130SPU31R part is unused and in its original packaging.

Return procedure for LD39130SPU31R:

1.Submit a request within 90 days.

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

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