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

STMicroelectronics LD39015M15R

Name: LD39015M15R
Brand: STMicroelectronics
SKU: LD39015M15R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39015M15R

Manufacturer:: STMicroelectronics

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

Package:: SC-74A, SOT-753

Datasheet:: LD39015M15R.pdf

Description:: IC REG LINEAR 1.5V 150MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,196

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Product details

Overview

LD39015M15R from STMicroelectronics is a 150 mA ultra-low-noise, low-quiescent-current LDO voltage regulator delivering a fixed 1.5 V output with ±2.0% accuracy at 25 °C, 80 mV typical dropout at 100 mA, 18 µA quiescent current at no load, and 29 µV_RMS output noise (1.1–100 kHz) - designed for power-sensitive battery-operated systems such as mobile handsets and PDAs.

For engineers reviewing the LD39015M15R datasheet, LD39015M15R pinout, LD39015M15R application, or LD39015M15R equivalent, key selection criteria include guaranteed 150 mA output under 1.5–5.5 V input, logic-controlled shutdown (<1 µA OFF-mode current), ceramic capacitor compatibility (C_OUT = 1 µF), thermal/short-circuit protection, and operation across –40 °C to 125 °C junction temperature.

Technical Context

The LD39015M15R implements a bandgap-referenced feedback loop with internal trimming resistors (R1/R2) and thermal/overcurrent protection circuitry. Its enable-controlled shutdown path reduces total supply current below 1 µA, while its ultra-low dropout architecture maintains regulation down to VIN = VOUT + 80 mV (typ.) at full load.

Stability is ensured with 1 µF ceramic output capacitance and ESR <2.4 Ω; PSRR reaches 65 dB at 1 kHz but rolls off above 10 kHz. Noise performance is specified without external bypass capacitors - critical for RF and precision analog subsystems where board space and BOM count are constrained.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 1.5 V ±2.0% at 25 °C - ensures stable core/bias rail for low-voltage logic and sensors.
Max output current	150 mA guaranteed - supports multiple low-power peripherals from single LDO.
Dropout voltage	80 mV typ. at 100 mA - enables operation from single-cell Li-ion (3.0 V min) or coin cell (1.5 V) inputs.
Quiescent current	18 µA typ. at no load; 38 µA typ. at 150 mA - extends battery life in always-on standby modes.
Output noise	29 µV_RMS (1.1–100 kHz, V_OUT = 0.8 V) - meets noise requirements for ADC references and RF synthesizers.
PSRR	65 dB at 1 kHz - suppresses ripple from noisy switching supplies feeding the LDO input.
Enable logic threshold	V_IL ≤ 0.4 V, V_IH ≥ 0.9 V - compatible with 1.2 V/1.8 V GPIO without level-shifting.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.95 mm × 1.60 mm footprint, 0.95 mm pitch, thermally enhanced die pad (no exposed pad connection).

Pin/Terminal	Circuit Role	Design Meaning
1 - IN	LDO input supply	Accepts 1.5–5.5 V DC; requires 1 µF ceramic input capacitor for stability.
2 - GND	Analog/digital ground reference	Common return for IN, OUT, and EN; must be low-impedance connection to minimize noise coupling.
3 - EN	Active-high enable control	Drives internal pass transistor; <0.4 V disables regulator (I_Q <1 µA), >0.9 V enables.
4 - NC	No connect	Internally unconnected; must remain floating or tied to GND per layout guidelines.
5 - OUT	Regulated output	Delivers 1.5 V ±2% with 1 µF ceramic output capacitor; supports up to 150 mA load.

Key Features

Feature	Design Value
Ultra-low-noise regulation	29 µV_RMS output noise without bypass cap - eliminates need for secondary filtering in sensitive analog rails.
Logic-controlled shutdown	<1 µA OFF-mode current with EN = GND - enables deep-sleep power states in portable devices.
Ceramic capacitor compatibility	Stable with 1 µF C_OUT, ESR <2.4 Ω - reduces BOM cost and PCB area vs. tantalum/aluminum electrolytics.
Thermal & short-circuit protection	160 °C thermal shutdown with 20 °C hysteresis; 350 mA short-circuit current limit - prevents damage during fault conditions.
Wide operating temperature	–40 °C to 125 °C junction range - qualified for automotive infotainment and industrial edge sensor nodes.

Applications

Mobile Handset Power Rail

Wearable Sensor Bias Supply

Use Scenario: Providing clean 1.5 V bias to MEMS accelerometers and low-power Bluetooth SoCs in compact wearables.

IC Role / Device Role / Timing Role: Primary low-noise LDO for analog sensor front-end and radio subsystems.

Use Value: 29 µV_RMS noise and 18 µA quiescent current directly extend battery runtime while preserving signal integrity.

Use Scenario: Regulating power to ultra-low-power microcontrollers (e.g., ARM Cortex-M0+) in hearables and fitness trackers.

IC Role / Device Role / Timing Role: Core system LDO enabling sub-µA sleep modes via EN-controlled shutdown.

Use Value: <1 µA OFF-mode current and fast 30 µs turn-on time support responsive wake-from-sleep behavior.

Industrial IoT Edge Node

Medical Diagnostic Patch

Use Scenario: Delivering stable 1.5 V to isolated ADCs and wireless transceivers in battery-powered condition-monitoring sensors.

IC Role / Device Role / Timing Role: Precision analog supply LDO with high PSRR to reject switching noise from nearby DC-DC converters.

Use Value: 65 dB PSRR at 1 kHz and ±2.0% output tolerance ensure accurate 12-bit+ measurement fidelity.

Use Scenario: Powering biosignal amplifiers and low-power ECG front-ends in disposable patient monitoring patches.

IC Role / Device Role / Timing Role: Medical-grade LDO meeting IEC 60601 leakage and reliability requirements.

Use Value: –40 °C to 125 °C operation and internal thermal protection support safe, long-duration clinical use.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P152MR	150 mA, 1.5 V fixed, 1.0 µA IQ (typ.), but only 60 dB PSRR at 1 kHz and no EN pin.	Lacks enable control and has lower noise rejection - unsuitable for dynamic power-gating or RF-adjacent rails.	Select when minimal IQ is primary requirement and EN functionality is not needed.
ROHM BD39015GUL	150 mA, 1.5 V fixed, 25 µA IQ (typ.), SOT-23-5, but 120 mV dropout at 100 mA and 45 µV_RMS noise.	Higher dropout and noise limit use in single-cell Li-ion or precision analog systems.	Select when wider input range (up to 6.5 V) is required and modest noise/dropout trade-offs are acceptable.

Compared with XC6206P152MR and BD39015GUL, the LD39015M15R uniquely combines EN control, lowest noise (29 µV_RMS), and tightest dropout (80 mV) - making it optimal for space-constrained, battery-sensitive designs requiring both low IQ and high analog integrity.

Availability

LD39015M15R is available at Aetrix Electronics and suitable for mobile handset power rails, wearable sensor bias supplies, and industrial IoT edge nodes requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for LD39015M15R 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The LD39015 series belongs to ST's high-performance analog LDO portfolio, engineered specifically for ultra-low-power, low-noise battery-powered applications where efficiency, precision, and reliability are non-negotiable.

FAQ

What is the minimum input voltage required for regulation at 1.5 V output?

The LD39015M15R requires VIN ≥ VOUT + VDROP. With 80 mV typical dropout at 100 mA, minimum functional input is 1.58 V. Absolute minimum VIN per datasheet is 1.5 V, but regulation margin degrades below 1.58 V under load. UVLO turns on at 1.45 V nominal, ensuring predictable startup.

Can the LD39015M15R operate with a 0.47 µF output capacitor?

No. The device requires ≥1 µF ceramic output capacitance for guaranteed stability, as confirmed by Figure 7 (stability region) and Table 5 (COUT specification). Using 0.47 µF risks oscillation or poor transient response, especially across temperature and load variations.

Is the NC pin (Pin 4) required to be grounded or left floating?

Pin 4 is internally unconnected and must remain floating. ST's layout guidelines explicitly prohibit connecting NC pins to any net, including GND, as it may compromise thermal performance or introduce parasitic coupling. No solder mask opening or routing is needed.

Does the LD39015M15R support adjustable output voltages?

No. LD39015M15R is a fixed-output variant (1.5 V). Adjustable versions (e.g., LD39015xx with external resistor dividers) are not offered in this family - all part numbers specify fixed voltages from 0.8 V to 3.3 V in 100 mV steps, with no external feedback option.

LD39015M15R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-74A, SOT-753

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):: 1.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.1V @ 100mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: 70 µA

PSRR:: 65dB ~ 62dB (1kHz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

LD39015M15R FAQ

1.How can I place an order for LD39015M15R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39015M15R 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 LD39015M15R reliable?

The price and inventory of LD39015M15R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39015M15R is usually 5 days.

3.What payment methods are accepted for LD39015M15R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39015M15R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39015M15R?

LD39015M15R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39015M15R 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 LD39015M15R?

For technical support, including LD39015M15R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39015M15R requirements.

6.How does Aetrix verify that LD39015M15R is sourced from the original manufacturer or authorized distributors?

All LD39015M15R 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 LD39015M15R meets industry standards.

7.What is the process for return or replacement of LD39015M15R?

All LD39015M15R units undergo pre-shipment inspection (PSI). If there is an issue with LD39015M15R, 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 LD39015M15R part is unused and in its original packaging.

Return procedure for LD39015M15R:

1.Submit a request within 90 days.

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

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