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

STMicroelectronics LDK220PU33R

Name: LDK220PU33R
Brand: STMicroelectronics
SKU: LDK220PU33R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDK220PU33R

Manufacturer:: STMicroelectronics

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

Package:: 6-XFDFN

Datasheet:: LDK220PU33R.pdf

Description:: IC REG LINEAR 3.3V 200MA 6DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LDK220PU33R from STMicroelectronics is a fixed-output 3.3 V, 200 mA low-dropout linear regulator in DFN6-1.2×1.3 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 powers core rails in space-constrained battery-powered equipment and industrial controllers.

For engineers reviewing the LDK220PU33R datasheet, LDK220PU33R pinout, LDK220PU33R application, or LDK220PU33R equivalent, this page delivers verified electrical specs, thermal performance data, package-specific pin mapping, real-world use cases, and validated alternative options for design-in and supply continuity.

Technical Context

The LDK220PU33R implements a bandgap-referenced error amplifier driving a PMOS pass transistor, enabling ultra-low dropout and stable regulation across input voltages from 2.5 V to 13.2 V. Its internal bias generator and thermal protection circuitry activate shutdown above 160 °C with 20 °C hysteresis.

It supports ceramic output capacitors as low as 1 µF due to integrated phase compensation, and embeds an active output discharge path (R_dis = 18 Ω) activated when EN is low-preventing floating VOUT during power sequencing in portable systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±2.0% at 25 °C; ensures stable MCU I/O rail without external feedback resistors.
Max Output Current	200 mA guaranteed; sufficient for powering microcontrollers, sensors, and interface ICs in compact designs.
Dropout Voltage	100 mV typ. @ 100 mA; enables operation down to VIN = 3.4 V while maintaining regulation-critical for single-cell Li-ion or 3.7 V battery systems.
Quiescent Current	55 µA typ. @ no load; extends battery life in always-on monitoring nodes and remote sensors.
Noise Performance	20 µV_RMS (10 Hz–100 kHz); minimizes interference in analog signal chains and RF subsystems.
Supply Rejection	55 dB @ 120 Hz–1 kHz; suppresses ripple from switching DC/DC converters feeding the LDO input.
Operating Temp	−40 °C to +125 °C junction temperature; qualified for automotive under-hood and industrial control environments.

Pinout & Package

LDK220PU33R is housed in a 6-pin DFN6-1.2×1.3 mm package with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts. Thermal resistance is R_thJA = 237 °C/W and R_thJC = 104 °C/W (JEDEC 4-layer board).

Pin/Terminal	Circuit Role	Design Meaning
1	OUT	Regulated 3.3 V output; connects directly to load; requires ≥1 µF ceramic capacitor to ground for stability.
2	N/C	No internal connection; must remain unconnected and un-bonded on PCB.
3	ADJ/NC	Not connected in fixed-output version; left floating-no external components required.
4	EN	Active-high enable input; drives device into <1 µA shutdown when pulled low; must not float.
5	GND	Power ground reference; tie directly to low-impedance system ground plane for noise immunity.
6	IN	Input supply (2.5–13.2 V); place 1 µF ceramic decoupling capacitor within 2 mm of this pin.

Key Features

Feature	Design Value
Ultra-low quiescent current	55 µA typical operating current enables >1-year battery life in 10 µA average-load IoT sensors.
Integrated output discharge	18 Ω internal pull-down activates automatically when EN = low, eliminating need for external bleed resistor.
Ceramic capacitor compatible	Stable with 1 µF C_OUT; reduces BOM count and board area vs. legacy tantalum-based LDOs.
Logic-controlled shutdown	EN pin accepts standard CMOS logic levels (V_IL ≤ 0.4 V, V_IH ≥ 1.2 V), interoperable with 1.8 V/3.3 V microcontrollers.
Thermal and short-circuit protection	Auto-recovery thermal shutdown at 160 °C with 20 °C hysteresis; constant-current limiting up to 400 mA.

Applications

Portable Medical Sensor Node

Industrial PLC I/O Module

Use Scenario: Wearable ECG patch with Bluetooth LE MCU and analog front-end powered from coin cell.

IC Role / Device Role / Timing Role: Primary 3.3 V rail regulator supplying MCU, ADC, and BLE radio; enables clean power during RF transmission bursts.

Use Value: 20 µV_RMS noise prevents baseline drift in 24-bit ECG measurements; 100 mV dropout extends usable battery range by 12% over competing LDOs.

Use Scenario: DIN-rail mounted digital input module operating in factory ambient up to 70 °C.

IC Role / Device Role / Timing Role: Local 3.3 V supply for isolated SPI interface IC and status LED driver; withstands 125 °C junction temperature during overload.

Use Value: −40 °C to +125 °C rating eliminates derating concerns; 237 °C/W R_thJA allows full 200 mA output without heatsink in convection-cooled enclosures.

Set-Top Box USB Hub Controller

Automotive Infotainment Display Backlight Driver

Use Scenario: Low-cost STB with dual USB 2.0 ports requiring independent 3.3 V VBUS regulation.

IC Role / Device Role / Timing Role: Secondary LDO for USB PHY power domain; sequenced via EN pin synchronized with main SoC power-up.

Use Value: EN pin timing compatibility with 100 µs turn-on (Fig. 25) ensures USB enumeration compliance; 55 dB SVR suppresses SMPS ripple coupling into data lines.

Use Scenario: TFT-LCD backlight driver IC powered from vehicle 12 V rail with transient spikes up to ±100 V.

IC Role / Device Role / Timing Role: Pre-regulator stepping 12 V down to 3.3 V for driver logic; placed upstream of TVS diode to reduce clamping energy.

Use Value: 13.2 V max input rating tolerates load-dump transients without external clamp; 1 µA shutdown current prevents battery drain during ignition-off state.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6219B332MR-G	Same 3.3 V fixed output, but SOT-25 package (5-pin); 120 mV dropout @ 100 mA; 25 µA I_Q.	Lacks EN pin and output discharge; unsuitable for power-sequenced systems requiring controlled VOUT ramp-down.	Select if minimal quiescent current is critical and enable control is handled externally.
Diodes Inc. AP2204K-3.3TRG1	SOT-23-5 package; 300 mV dropout @ 150 mA; 65 µA I_Q; no output discharge function.	Higher dropout limits use with sub-3.6 V inputs; thermal resistance (R_thJA = 250 °C/W) restricts continuous 200 mA output in sealed enclosures.	Choose for cost-sensitive consumer applications where space constraints favor SOT-23-5 over DFN6.

Compared with XC6219B332MR-G and AP2204K-3.3TRG1, LDK220PU33R uniquely combines DFN6 footprint efficiency, 100 mV dropout, EN-controlled shutdown, and integrated output discharge-making it optimal for battery-powered and thermally constrained designs requiring robust power sequencing.

Availability

LDK220PU33R is available at Aetrix Electronics and suitable for portable medical sensor nodes, industrial PLC I/O modules, set-top box USB hub controllers, and automotive infotainment display backlight drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LDK220PU33R 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-noise LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications where ultra-low I_Q, tight output tolerance, and reliable power sequencing are mandatory.

FAQ

What is the minimum input voltage required for LDK220PU33R to maintain regulation at 200 mA load?

The minimum input voltage is calculated as V_OUT + V_DROP = 3.3 V + 350 mV = 3.65 V (max dropout at 200 mA, 40–125 °C). At room temperature, 3.4 V suffices due to 200 mV typical dropout. Input below 2.5 V is prohibited per absolute maximum ratings.

Can LDK220PU33R be used with aluminum polymer capacitors instead of ceramic?

No-stability is only guaranteed with ceramic capacitors (1–22 µF, ESR ≤ 100 mΩ). Aluminum polymer caps exhibit higher ESR and phase shift that may cause oscillation, as confirmed by Figure 22 (stability vs. C_OUT/ESR) in DS10219 Rev 7.

Is the ADJ pin accessible in the LDK220PU33R variant?

No-the "PU" suffix denotes the DFN6 package with fixed 3.3 V output; ADJ/NC pin (Pin 3) is internally disconnected and must remain unconnected on the PCB. Adjustable versions use "-R" suffix (e.g., LDK220PU-R).

Does the output discharge function require external components to operate?

No-output discharge is fully internal: when EN is driven low, a 18 Ω switch connects VOUT to GND, discharging C_OUT without external resistors. Applying voltage to VOUT while EN is low is prohibited per datasheet warning (DS10219 p.2) to avoid damage.

LDK220PU33R 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):: 13.2V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

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

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

LDK220PU33R FAQ

1.How can I place an order for LDK220PU33R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDK220PU33R 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 LDK220PU33R reliable?

The price and inventory of LDK220PU33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK220PU33R is usually 5 days.

3.What payment methods are accepted for LDK220PU33R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK220PU33R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDK220PU33R?

LDK220PU33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDK220PU33R 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 LDK220PU33R?

For technical support, including LDK220PU33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK220PU33R requirements.

6.How does Aetrix verify that LDK220PU33R is sourced from the original manufacturer or authorized distributors?

All LDK220PU33R 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 LDK220PU33R meets industry standards.

7.What is the process for return or replacement of LDK220PU33R?

All LDK220PU33R units undergo pre-shipment inspection (PSI). If there is an issue with LDK220PU33R, 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 LDK220PU33R part is unused and in its original packaging.

Return procedure for LDK220PU33R:

1.Submit a request within 90 days.

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

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