Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LDK220U32R

Name: LDK220U32R
Brand: STMicroelectronics
SKU: LDK220U32R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LDK220U32R

Manufacturer:: STMicroelectronics

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

Package:: TO-243AA

Datasheet:: LDK220U32R.pdf

Description:: IC REG LINEAR 3.2V 200MA SOT89

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,363

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LDK220U32R from STMicroelectronics is a 3.2 V fixed-output, 200 mA low-dropout linear regulator in SOT-89 package, featuring 100 mV typical dropout at 100 mA, ±2.0% output voltage tolerance at 25 °C, and logic-controlled shutdown with <1 µA off-mode current. It operates from 2.5 V to 13.2 V input and supports ceramic output capacitors as low as 1 µF - ideal for space-constrained, battery-powered TV and set-top box power rails.

For engineers reviewing the LDK220U32R datasheet, LDK220U32R pinout, LDK220U32R application, or LDK220U32R equivalent, key selection criteria include dropout performance under 200 mA load, thermal behavior in SOT-89 (R_thJA = 110 °C/W), enable threshold stability across –40 °C to 125 °C, and compatibility with low-ESR ceramic output capacitance.

Technical Context

The LDK220U32R implements a bandgap-referenced error amplifier driving a PMOS pass transistor, enabling ultra-low dropout and stable regulation without requiring external compensation. Its internal bias generator and thermal protection circuitry activate shutdown at 160 °C with 20 °C hysteresis.

Logic-controlled EN pin enables precise system-level power sequencing: asserted high (>1.2 V) for regulation, pulled low (<0.4 V) for sub-1 µA quiescent state with active output discharge (R_dis = 18 Ω). The SOT-89 variant omits ADJ and EN pins - confirming LDK220U32R is a fixed-output, non-adjustable, non-enable version per Table 14 and Figure 3.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 3.2 V ±2.0% at 25 °C - ensures stable core supply for 3.3 V-tolerant digital ICs with margin
Max output current	200 mA guaranteed - sufficient for HDMI PHY, tuner LNB bias, or audio codec rails
Dropout voltage	100 mV typ. @ 100 mA - enables operation down to VIN = 3.3 V while maintaining regulation
Quiescent current	55 µA typ. @ no load - extends battery life in always-on standby circuits
Input voltage range	2.5 V to 13.2 V - accommodates single-cell Li-ion (3.0–4.2 V), 5 V USB, and 12 V industrial rails
Thermal shutdown	160 °C with 20 °C hysteresis - prevents latch-up during transient overloads in enclosed enclosures
Noise (10 Hz–100 kHz)	20 µV_RMS - minimizes ripple-induced jitter in analog audio or RF front-end supplies

Pinout & Package

LDK220U32R uses the SOT-89 package (3-pin, exposed tab for thermal conduction), distinct from 5-pin SOT23/SOT323 and 6-pin DFN variants. Per DS10219 Rev 7 page 3, SOT-89 has no EN or ADJ functionality - only IN, GND, and OUT pins.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Regulated output node	Delivers stable 3.2 V; requires ≥1 µF ceramic capacitor to ground for stability
2 (GND)	Power and signal reference	Low-impedance return path; must be connected directly to PCB ground plane under exposed tab
3 (IN)	Unregulated input supply	Accepts 2.5–13.2 V; needs local 1 µF ceramic decoupling within 5 mm of pin

Key Features

Feature	Design Value
Ultra-low dropout	100 mV @ 100 mA enables use with input as low as 3.3 V - critical for brownout resilience
Ceramic capacitor compatible	Stable with 1 µF C_OUT - eliminates need for costly tantalum or aluminum electrolytics
Wide input range	2.5–13.2 V supports multi-rail systems (Li-ion, USB, 12 V wall adapters) without redesign
High accuracy	±2.0% V_OUT tolerance at 25 °C ensures compliance with 3.3 V I/O voltage specs (±3%)
Industrial temperature range	–40 °C to 125 °C junction operation - validated for set-top box chassis near heat sources

Applications

TV Power Management

Set-Top Box Core Rail

Use Scenario: Providing clean 3.2 V bias to HDMI transmitter ICs in flat-panel TVs.

IC Role / Device Role / Timing Role: Primary post-regulator delivering low-noise, tightly regulated voltage to high-speed digital interface blocks.

Use Value: 20 µV_RMS noise prevents bit errors in TMDS clock recovery; 100 mV dropout allows operation during 5 V rail sag.

Use Scenario: Supplying 3.2 V to MPEG decoder SoC I/O banks in cable/satellite receivers.

IC Role / Device Role / Timing Role: Fixed-output LDO ensuring voltage stability during burst-mode video decoding loads up to 200 mA.

Use Value: ±2.0% output tolerance maintains setup/hold timing margins; 125 °C rating survives enclosure temperatures near power supplies.

Laptop Display Backlight Control

Industrial Human-Machine Interface

Use Scenario: Powering LED driver control logic in notebook display modules.

IC Role / Device Role / Timing Role: Secondary LDO isolating sensitive analog control circuitry from noisy DC-DC converter outputs.

Use Value: Low 55 µA quiescent current extends battery runtime in lid-closed suspend mode; ceramic capacitor compatibility reduces board area.

Use Scenario: Generating 3.2 V for ARM Cortex-M microcontroller I/O in factory automation panels.

IC Role / Device Role / Timing Role: Robust local regulator handling wide-input industrial 12 V bus variations and ESD transients.

Use Value: 13.2 V max input withstands load-dump spikes; thermal shutdown protects against enclosure overheating during extended operation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDK320U32R	Same 3.2 V output but 300 mA rated; lower R_thJA (90 °C/W) in SOT-89; identical pinout	Required where peak loads exceed 200 mA (e.g., multi-channel audio codecs)	Select when higher current headroom or improved thermal margin is needed without layout change
TLV73332PDBVR	3.2 V fixed, 300 mA, SOT-23-5; includes enable pin and higher PSRR (60 dB @ 1 kHz)	Suitable for designs needing active sequencing or tighter ripple rejection in noise-sensitive analog sections	Choose if system requires programmable enable or superior AC performance - but note different pinout and footprint

Compared with LDK220U32R, LDK320U32R offers higher current and better thermal dissipation in the same SOT-89 package, while TLV73332PDBVR adds enable control and higher PSRR but requires PCB redesign due to SOT-23-5 footprint and pin assignment.

Availability

LDK220U32R is available at Aetrix Electronics and suitable for TV power management, set-top box core rails, and industrial HMI applications requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LDK220U32R 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 LDK220 series belongs to ST's precision low-quiescent-current LDO portfolio, engineered specifically for battery-powered and thermally constrained applications where dropout, noise, and standby current are critical.

FAQ

Is LDK220U32R pin-compatible with other LDK220 variants?

No - LDK220U32R uses the 3-pin SOT-89 package with IN/GND/OUT only. SOT23-5L and SOT323-5L versions include EN and ADJ/NC pins; DFN6 adds a second NC pin. Pinouts differ across packages, and SOT-89 lacks enable functionality entirely per DS10219 section 2.

What is the minimum recommended output capacitance for stability?

The datasheet specifies 1 µF ceramic capacitor (X5R/X7R) as minimum for stable operation across all loads and temperatures. Larger values (up to 22 µF) improve transient response but are not required for basic regulation. Tantalum or aluminum electrolytics are not recommended due to ESR sensitivity.

Does LDK220U32R support adjustable output voltage?

No - LDK220U32R is a fixed 3.2 V output device. Adjustable versions use part numbers ending in "-R" (e.g., LDK220M-R) and require SOT23-5L or DFN6 packages with ADJ pin access. SOT-89 packaging does not support adjustability per datasheet footnote on page 3.

How does thermal performance compare between SOT-89 and SOT23-5L packages?

SOT-89 offers significantly better thermal resistance: R_thJA = 110 °C/W vs. 160 °C/W for SOT23-5L. This allows LDK220U32R to sustain 200 mA continuous output at higher ambient temperatures - critical in enclosed TV or set-top box chassis where airflow is limited.

LDK220U32R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 13.2V

Voltage - Output (Min/Fixed):: 3.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 200mA

Current - Quiescent (Iq):: 90 µA

Current - Supply (Max):: 100 µA

PSRR:: 55dB ~ 50dB (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-89

LDK220U32R FAQ

1.How can I place an order for LDK220U32R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK220U32R 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 LDK220U32R reliable?

The price and inventory of LDK220U32R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK220U32R is usually 5 days.

3.What payment methods are accepted for LDK220U32R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK220U32R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK220U32R?

LDK220U32R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK220U32R 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 LDK220U32R?

For technical support, including LDK220U32R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK220U32R requirements.

6.How does Aetrix verify that LDK220U32R is sourced from the original manufacturer or authorized distributors?

All LDK220U32R 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 LDK220U32R meets industry standards.

7.What is the process for return or replacement of LDK220U32R?

All LDK220U32R units undergo pre-shipment inspection (PSI). If there is an issue with LDK220U32R, 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 LDK220U32R part is unused and in its original packaging.

Return procedure for LDK220U32R:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…