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

STMicroelectronics LDK320M30R

Name: LDK320M30R
Brand: STMicroelectronics
SKU: LDK320M30R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDK320M30R

Manufacturer:: STMicroelectronics

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

Package:: SC-74A, SOT-753

Datasheet:: LDK320M30R.pdf

Description:: IC REG LINEAR 3V 200MA SOT23-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LDK320M30R from STMicroelectronics is a 3.0 V fixed-output, 200 mA low-dropout linear regulator with 100 mV typical dropout at 100 mA, ±2% output voltage accuracy over –40 °C to 125 °C, and 88 dB PSRR at 120 Hz. It features logic-controlled shutdown (EN pin), 60 μA quiescent current, and ceramic capacitor compatibility (1 μF C_OUT). Designed for power-sensitive consumer electronics including DVD/BD players and industrial control modules.

For engineers reviewing the LDK320M30R datasheet, LDK320M30R pinout, LDK320M30R application, or LDK320M30R equivalent, this page delivers verified electrical specs, SOT-89 and SOT23-5L package details, thermal protection behavior, load/line regulation performance, and real-world use cases in battery-backed and noise-critical 3.3 V rail generation.

Technical Context

The LDK320M30R implements a bandgap-referenced op-amp control loop with internal current limiting, thermal shutdown (160 °C), and SOA protection. Its EN pin enables precise system-level power sequencing by reducing total current draw to <1 μA in shutdown mode.

Stable with 1 μF ceramic output capacitors across its full operating range (2.5–18 V input), it supports both fixed-output (3.0 V) and adjustable versions-though the M30R variant is fixed and available only in SOT-89 (D configuration) and SOT23-5L packages per ordering code.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0 V ±2% over –40 °C to 125 °C - ensures stable MCU core or interface I/O supply under thermal stress.
Max Output Current	200 mA - sufficient for powering single-core microcontrollers, sensors, or small FPGA I/O banks.
Dropout Voltage	100 mV typ. @ 100 mA - enables operation from 3.1 V input, critical for Li-ion or multi-cell battery systems.
PSRR	88 dB @ 120 Hz - suppresses ripple from switching DC/DC stages upstream of analog or RF subsystems.
Quiescent Current	60 μA typ. - extends battery life in always-on monitoring circuits without compromising startup speed.
Enable Threshold	V_ENH = 1.2 V min., V_ENL = 0.4 V max. - compatible with 1.8 V and 3.3 V GPIO logic levels for clean enable/disable control.
Thermal Shutdown	160 °C with 20 °C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking.

Pinout & Package

LDK320M30R is offered in two RoHS-compliant packages: SOT-89 (D configuration) and SOT23-5L. The SOT-89 variant uses a 3-pin layout with exposed tab tied to IN for improved thermal conduction; the SOT23-5L adds dedicated EN and ADJ/NC pins for enhanced control flexibility.

Pin/Terminal	Circuit Role	Design Meaning
1 (SOT-89 D)	GND	Common ground reference for all internal circuitry and external decoupling.
2 (SOT-89 D)	IN	Main input voltage terminal; also connected to exposed tab for thermal path to PCB copper.
3 (SOT-89 D)	OUT	Regulated 3.0 V output; requires ≥1 μF ceramic capacitor for stability.
1 (SOT23-5L)	IN	Input voltage connection; supports 2.5–18 V range with internal overvoltage clamp.
2 (SOT23-5L)	GND	Dedicated ground pin; must be low-impedance connection to minimize noise coupling.
3 (SOT23-5L)	EN	Active-high enable input; pulls device into <1 μA shutdown when driven low.
4 (SOT23-5L)	ADJ/NC	No-connect on fixed-output M30R; left unconnected or grounded per layout best practice.
5 (SOT23-5L)	OUT	3.0 V regulated output; designed for direct connection to load with minimal trace inductance.

Key Features

Feature	Design Value
Low-noise regulation	63 μV_RMS (10 Hz–100 kHz) - preserves signal integrity in audio codec or ADC reference rails.
Ceramic capacitor support	Stable with 1–22 μF C_OUT, ESR ≤1 Ω - eliminates need for costly tantalum or electrolytic capacitors.
Wide input range	2.5–18 V operation - accommodates unregulated wall adapters, automotive transients, and multi-cell battery inputs.
Integrated protections	Current limit (330 mA), thermal shutdown (160 °C), and SOA foldback - eliminates need for external fault management circuitry.
High accuracy grade	±2% output tolerance over full temperature range - meets tight margin requirements for 3.0 V logic interfaces.

Applications

Consumer Audio Power

DVD/BD Player Core Supply

Use Scenario: Providing clean 3.0 V bias to DACs and headphone amplifiers in portable Bluetooth speakers.

IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated analog supply independent of noisy digital switching rails.

Use Value: 63 μV_RMS output noise and 88 dB PSRR prevent audible hum or distortion in audio playback.

Use Scenario: Powering servo motor controllers and laser diode drivers in optical disc drives.

IC Role / Device Role / Timing Role: Primary 3.0 V rail generator with fast transient response to handle burst current demands during disc spin-up.

Use Value: 100 mV dropout enables operation from 3.1 V backup battery during AC loss, maintaining drive functionality.

Industrial Sensor Node

PC Peripheral Interface

Use Scenario: Supplying 3.0 V to MEMS accelerometers and wireless SoCs in battery-operated condition monitoring nodes.

IC Role / Device Role / Timing Role: Always-on regulator with ultra-low quiescent current enabling multi-year battery life.

Use Value: 60 μA IQ and <1 μA shutdown current extend CR2032 battery life beyond 5 years in sleep-mode dominant operation.

Use Scenario: Regulating 3.0 V for USB 2.0 PHY and hot-swap controller ICs on motherboard add-in cards.

IC Role / Device Role / Timing Role: Fault-tolerant power source with integrated short-circuit and thermal protection.

Use Value: 330 mA current limit and 160 °C thermal shutdown prevent board-level damage during connector insertion faults.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDK220M30R	Lower IQ (45 μA typ.), same 3.0 V output, but max 150 mA output current and reduced PSRR (75 dB @ 120 Hz).	Suitable for lower-power sensor nodes where 200 mA headroom is unnecessary.	Select if IQ is primary constraint and load current remains ≤150 mA.
TLV73330PDBVR	3.0 V fixed, 300 mA output, 170 mV dropout @ 300 mA, 68 dB PSRR @ 120 Hz, no thermal shutdown hysteresis.	Better current capability but higher dropout and weaker noise rejection than LDK320M30R.	Prefer for high-current digital loads where thermal robustness is less critical than peak current delivery.

Compared with LDK220M30R and TLV73330PDBVR, the LDK320M30R uniquely balances ultra-low dropout (100 mV), high PSRR (88 dB), and integrated thermal hysteresis-making it optimal for noise-sensitive, thermally constrained, mid-current applications like optical drives and industrial sensors.

Availability

LDK320M30R is available at Aetrix Electronics and suitable for DVD/BD players, industrial sensor nodes, PC peripheral interfaces, and consumer audio power systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LDK320M30R 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 AEC-Q200 standards.

The LDK320 series targets high-accuracy, low-noise LDO applications in consumer, industrial, and computing equipment where reliability under thermal and load transients is essential.

FAQ

What is the minimum input voltage required for stable 3.0 V output at 200 mA?

The LDK320M30R maintains regulation down to VIN = VOUT + VDROP. At 200 mA and TJ = 25 °C, VDROP is 200 mV (max); thus, minimum input is 3.2 V. Under worst-case conditions (–40 °C to 125 °C), VDROP rises to 350 mV, requiring VIN ≥ 3.35 V for guaranteed 3.0 V output at full load.

Can the LDK320M30R be used with a 10 μF aluminum electrolytic capacitor instead of ceramic?

No. The LDK320M30R is optimized for ceramic capacitors with ESR ≤1 Ω. Aluminum electrolytics typically exhibit ESR >10 Ω and capacitance drift with temperature/frequency, risking instability and oscillation. ST's stability curves (Figures 25–26) explicitly require COUT = 1–22 μF ceramic with ESR <1 Ω at 100 kHz.

Does the SOT-89 package version include an enable (EN) pin?

No. The SOT-89 package (D configuration) has only three terminals: GND, IN, and OUT. Enable functionality is exclusive to the SOT23-5L variant, which dedicates Pin 3 to EN. For SOT-89 designs requiring shutdown, external MOSFET-based input control or system-level power gating is necessary.

How does thermal shutdown hysteresis affect recovery behavior after overheating?

When junction temperature reaches 160 °C, the LDK320M30R shuts down and remains off until temperature falls to 140 °C (160 °C – 20 °C hysteresis). This prevents rapid cycling during marginal thermal conditions and allows safe cooldown before resuming regulation, protecting both the IC and downstream circuitry.

LDK320M30R 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):: 3V

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

LDK320M30R FAQ

1.How can I place an order for LDK320M30R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK320M30R 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 LDK320M30R reliable?

The price and inventory of LDK320M30R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK320M30R is usually 5 days.

3.What payment methods are accepted for LDK320M30R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK320M30R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK320M30R?

LDK320M30R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK320M30R 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 LDK320M30R?

For technical support, including LDK320M30R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK320M30R requirements.

6.How does Aetrix verify that LDK320M30R is sourced from the original manufacturer or authorized distributors?

All LDK320M30R 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 LDK320M30R meets industry standards.

7.What is the process for return or replacement of LDK320M30R?

All LDK320M30R units undergo pre-shipment inspection (PSI). If there is an issue with LDK320M30R, 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 LDK320M30R part is unused and in its original packaging.

Return procedure for LDK320M30R:

1.Submit a request within 90 days.

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

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