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

STMicroelectronics LDK320AM15R

Name: LDK320AM15R
Brand: STMicroelectronics
SKU: LDK320AM15R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDK320AM15R

Manufacturer:: STMicroelectronics

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

Package:: SC-74A, SOT-753

Datasheet:: LDK320AM15R.pdf

Description:: IC REG LINEAR 1.5V 200MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,535

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Product details

Overview

LDK320AM15R from STMicroelectronics is a 1.5 V fixed-output, 200 mA low-dropout linear regulator in SOT23-5L package, featuring 100 mV typical dropout at 100 mA, ±0.5% output accuracy at 25 °C, and 88 dB PSRR at 120 Hz. It supports logic-controlled shutdown (EN pin), operates from 2.5 V to 18 V input, and is stabilized with 1 μF ceramic output capacitor - ideal for power rails in portable DSC and DVD systems.

For engineers reviewing the LDK320AM15R datasheet, LDK320AM15R pinout, LDK320AM15R application, or LDK320AM15R equivalent, key selection criteria include its high-accuracy 1.5 V output, ultra-low quiescent current (60 μA typ.), thermal/short-circuit protection, and compatibility with low-ESR ceramic capacitors in space-constrained designs.

Technical Context

The LDK320AM15R implements a bandgap-referenced op-amp control loop with internal bias generator and thermal shutdown circuitry (trip point 160 °C, 20 °C hysteresis). Its EN pin provides active-high logic control, enabling sub-1 μA shutdown current.

Designed for stability with 1 μF ceramic COUT, it delivers low-noise regulation (63 μVRMS, 10 Hz–100 kHz) and maintains load regulation within 15 mV (SOT23-5L, ≤2 V output) across 1–200 mA. The SOT23-5L variant includes dedicated ADJ/NC pin (pin 4), unused in fixed-voltage versions like LDK320AM15R.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5 V ±0.5% at 25 °C - ensures precise rail for low-voltage logic and analog circuitry.
Max Output Current	200 mA - sufficient for powering microcontrollers, sensors, and interface ICs in compact consumer devices.
Dropout Voltage	100 mV typ. @ 100 mA - enables operation with minimal headroom (e.g., 1.6 V input for 1.5 V output).
Quiescent Current	60 μA typ. @ no load - extends battery life in always-on or low-duty-cycle portable applications.
PSRR	88 dB @ 120 Hz - effectively suppresses ripple from noisy DC-DC converter outputs or AC adapters.
Operating Temp	−40 °C to +125 °C junction - supports industrial and automotive-adjacent environments without derating.
Input Voltage Range	2.5 V to 18 V - accommodates single-cell Li-ion (3.0–4.2 V), multi-cell alkaline, or wide-range industrial supplies.

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.25 mm max height, 2.92 mm × 2.80 mm footprint, thermal pad connected to GND (pin 2) for enhanced dissipation (R_thJA = 160 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Regulator input supply	Accepts 2.5–18 V; requires local 1 μF ceramic bypass capacitor (C_IN) near pin.
2 (GND)	Power and reference ground	Common return path for IN, OUT, EN; connects to thermal pad for heat sinking.
3 (EN)	Enable control input	Active-high logic: ≥1.2 V = ON, ≤0.4 V = shutdown (I_Q < 1 μA); 0.1–100 nA input leakage.
4 (ADJ/NC)	Adjust pin / Not connected	No-connect in fixed-output variants (LDK320AMxxR); must be left floating or tied to GND per layout guidelines.
5 (OUT)	Regulated output voltage	Delivers stable 1.5 V; requires 1–22 μF ceramic capacitor (C_OUT) with ESR ≤1 Ω for stability.

Key Features

Feature	Design Value
Ultra-low dropout	100 mV typical at 100 mA - enables use with weak or depleting batteries while maintaining regulation.
High-accuracy output	±0.5% tolerance at 25 °C - reduces need for post-regulation trimming in precision analog subsystems.
Low-noise regulation	63 μV_RMS (10 Hz–100 kHz) - minimizes interference in RF receivers, audio codecs, and ADC reference paths.
Robust protection suite	Integrated thermal shutdown (160 °C), short-circuit current limiting (330 mA), and SOA protection - eliminates need for external fault management.
Ceramic capacitor compatible	Stable with 1 μF C_OUT - lowers BOM cost and board area vs. tantalum or electrolytic alternatives.

Applications

Digital Still Camera (DSC) Power Rail

Blu-ray/DVD Player Audio Section

Use Scenario: Supplies clean 1.5 V bias to CMOS image sensor interface and flash memory controller in battery-powered DSCs.

IC Role / Device Role / Timing Role: Primary LDO for low-noise digital core rail, sequenced via EN pin during power-up.

Use Value: 60 μA quiescent current extends standby time; 88 dB PSRR rejects switching noise from main DC-DC converter.

Use Scenario: Powers DAC and headphone amplifier stage in Blu-ray players requiring ultra-low noise and tight voltage tolerance.

IC Role / Device Role / Timing Role: Post-regulator for audio signal chain, placed after bulk 3.3 V supply to isolate analog section.

Use Value: 63 μV_RMS output noise prevents audible hiss; ±0.5% accuracy ensures consistent DAC full-scale output.

Industrial PLC I/O Module

PC Peripheral Controller

Use Scenario: Provides isolated 1.5 V supply to isolated RS-485 transceiver bias and level-shifting logic in harsh industrial environments.

IC Role / Device Role / Timing Role: Local regulation for communication interface IC, enabled only during data transmission.

Use Value: −40 °C to +125 °C operation ensures reliability in uncontrolled enclosures; thermal shutdown prevents latch-up under overload.

Use Scenario: Delivers 1.5 V to USB hub controller and embedded flash in compact PC accessories (e.g., docking stations).

IC Role / Device Role / Timing Role: Secondary LDO for low-power peripheral logic, controlled by host-enabling signal via EN pin.

Use Value: SOT23-5L footprint saves PCB area; 100 mV dropout allows direct use of 1.8 V intermediate rail as input.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6219B152MR-G	1.5 V fixed, ±2% accuracy, 150 mA max, 65 dB PSRR @ 120 Hz, SOT23-5	Lacks EN pin and thermal shutdown; lower PSRR limits noise-sensitive uses	Choose only if cost sensitivity outweighs accuracy and protection requirements
Diodes AP7361-15YG-13	1.5 V fixed, ±2% accuracy, 300 mA max, 70 dB PSRR @ 120 Hz, SOT23-5	Higher current but looser tolerance and no EN pin; no thermal shutdown	Prefer when higher output current is critical and system-level thermal monitoring exists

Compared with XC6219B152MR-G and AP7361-15YG-13, the LDK320AM15R uniquely combines ±0.5% accuracy, integrated EN control, thermal shutdown, and 88 dB PSRR - making it the only option suitable for battery-powered, noise-critical, and safety-aware designs without external supervision.

Availability

LDK320AM15R is available at Aetrix Electronics and suitable for digital still cameras, Blu-ray/DVD players, industrial PLC I/O modules, and PC peripheral controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LDK320AM15R 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 components for industrial, automotive, and consumer markets.

The LDK320 series belongs to ST's high-accuracy, low-quiescent-current LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications where precision regulation, small footprint, and robust protection are mandatory.

FAQ

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

The LDK320AM15R maintains regulation down to VIN = VOUT + VDROP. With 100 mV typical dropout at 100 mA, the minimum functional input is 1.6 V. However, the absolute minimum specified operating input is 2.5 V per datasheet - below which performance (e.g., PSRR, accuracy) is not guaranteed and startup may fail.

Can the LDK320AM15R be used with a 10 μF aluminum electrolytic capacitor on the output?

No. The LDK320AM15R is optimized for ceramic capacitors (1–22 μF, ESR ≤1 Ω). Aluminum electrolytics typically exhibit ESR >10 Ω and capacitance drift with temperature/voltage, risking instability and oscillation. Only X5R/X7R ceramic types meeting the datasheet's ESR/COUT stability plan should be used.

Is the EN pin internally pulled down when not driven?

No. The EN pin has no internal pull-down; it is a high-impedance CMOS input (I_EN ≤100 nA). Leaving it floating risks undefined operation due to noise coupling. For reliable shutdown, tie EN to GND through a resistor (≤100 kΩ); for default-on operation, connect directly to VIN.

Does the ±0.5% output accuracy include line and load regulation effects?

Yes. The ±0.5% specification (LDK320A grade) is the total output voltage error over temperature (−40 °C to +125 °C), line (2.5–18 V input), and load (0–200 mA), as verified in Table 6 of DS11321. Static line/load regulation contributes ≤0.05 %/V and ≤15 mV respectively - fully included in the ±0.5% bound at 25 °C.

LDK320AM15R 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):: 18V

Voltage - Output (Min/Fixed):: 1.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.35V @ 200mA

Current - Output:: 200mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: 100 µA

PSRR:: 88dB ~ 48dB (120Hz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

LDK320AM15R FAQ

1.How can I place an order for LDK320AM15R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK320AM15R 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 LDK320AM15R reliable?

The price and inventory of LDK320AM15R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK320AM15R is usually 5 days.

3.What payment methods are accepted for LDK320AM15R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK320AM15R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK320AM15R?

LDK320AM15R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK320AM15R 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 LDK320AM15R?

For technical support, including LDK320AM15R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK320AM15R requirements.

6.How does Aetrix verify that LDK320AM15R is sourced from the original manufacturer or authorized distributors?

All LDK320AM15R 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 LDK320AM15R meets industry standards.

7.What is the process for return or replacement of LDK320AM15R?

All LDK320AM15R units undergo pre-shipment inspection (PSI). If there is an issue with LDK320AM15R, 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 LDK320AM15R part is unused and in its original packaging.

Return procedure for LDK320AM15R:

1.Submit a request within 90 days.

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

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