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STMicroelectronics LDK220PU-R
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- Part No.:
- LDK220PU-R
- Manufacturer:
- STMicroelectronics
- Package:
- 6-XFDFN
- Datasheet:
-
LDK220PU-R.pdf
- Description:
- IC REG LINEAR POS ADJ 200MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
LDK220PU-R from STMicroelectronics is an adjustable-output, 200 mA low-dropout linear regulator with logic-controlled shutdown, output discharge, and ceramic-capacitor compatibility (COUT = 1 µF). It operates from 2.5 V to 13.2 V input, delivers ±2.0% output voltage accuracy at 25 °C, and achieves 100 mV typical dropout at 100 mA - optimized for space-constrained, battery-powered systems requiring stable low-noise bias.
For engineers reviewing the LDK220PU-R datasheet, LDK220PU-R pinout, LDK220PU-R application, or LDK220PU-R equivalent, key selection criteria include its 55 µA typical quiescent current, 1 µA off-mode current, 200 mA guaranteed output, thermal/short-circuit protection, and support for fixed or adjustable configurations across SOT23-5L, SOT323-5L, SOT-89, and DFN6-1.2×1.3 packages.
Technical Context
The LDK220PU-R implements a bandgap-referenced op-amp control loop with internal bias generation and thermal shutdown (160 °C, 20 °C hysteresis). Its enable input (EN) provides logic-level shutdown with <1 µA total supply current, and an integrated 18 Ω discharge resistor actively pulls VOUT to GND when EN is low - preventing floating outputs in power sequencing.
It supports both fixed and adjustable versions; the PU-R suffix denotes the DFN6-1.2×1.3 package with ADJ/NC pin enabled for external resistor-divider configuration. Unlike SOT-89 variants, DFN6 and SOT23/SOT323-5L packages include full EN and ADJ functionality, enabling precise output tuning from 1.2 V to 12 V in 100 mV steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 200 mA guaranteed - sufficient for powering microcontrollers, sensors, or RF front-ends without external boost circuitry. |
| Dropout voltage | 100 mV typ. @ 100 mA - enables regulation from 3.4 V input to 3.3 V output with minimal headroom loss. |
| Quiescent current | 55 µA typ. - extends battery life in always-on IoT nodes; drops to <1 µA in shutdown mode. |
| Output noise | 20 µVRMS (10 Hz–100 kHz) - low enough for noise-sensitive analog rails (e.g., ADC reference, audio codec supplies). |
| 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 - qualified for industrial and automotive under-hood environments. |
| Output tolerance | ±2.0% @ 25 °C - ensures predictable voltage margining for downstream logic and analog circuits. |
| Capacitor support | Stable with 1 µF ceramic COUT - eliminates need for costly tantalum or large electrolytic capacitors. |
Pinout & Package
LDK220PU-R is housed in a 6-pin DFN package (1.2 mm × 1.3 mm, 0.4 mm height), featuring wettable flanks for automated optical inspection. The compact footprint supports high-density PCB layouts while delivering 237 °C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Regulated output voltage node - connects directly to load; requires 1 µF ceramic capacitor to GND for stability. |
| 2 | N/C | No connection - electrically isolated; must not be tied to any net or plane. |
| 3 | ADJ/NC | Adjust pin on adjustable version - sets output via external R1/R2 divider; left open on fixed versions. |
| 4 | EN | Active-high enable input - drives device into <1 µA shutdown when pulled low; must not float. |
| 5 | GND | Power ground reference - shared return path for input, output, and internal circuitry; requires low-impedance plane. |
| 6 | IN | Input voltage supply - accepts 2.5–13.2 V; requires local 1 µF ceramic decoupling capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-controlled shutdown | EN pin reduces total current to <1 µA - enables clean power gating in multi-rail systems without external MOSFETs. |
| Output discharge function | 18 Ω internal pull-down activates when EN = low - prevents residual voltage hold-up on VOUT, critical for safe hot-swap or reset sequencing. |
| Ceramic capacitor compatibility | Stable with ≥1 µF X5R/X7R ceramics - eliminates ESR dependency and simplifies BOM by removing need for specialized capacitors. |
| Low-noise regulation | 20 µVRMS noise floor - avoids signal corruption in precision analog stages such as op-amp biasing or sensor excitation. |
| Thermal & short-circuit protection | Auto-recovering 160 °C shutdown with 20 °C hysteresis and 400 mA current limit - prevents damage during overload or ambient temperature spikes. |
| Wide output adjustability | 1.2 V to 12 V in 100 mV increments via external resistors - supports diverse SoC core, I/O, and peripheral rail requirements from one base part. |
Applications
| Wearable Health Monitor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU, optical heart-rate sensor, and BLE radio from a single coin-cell or Li-ion battery. IC Role / Device Role / Timing Role: Primary bias regulator providing clean, sequenced 1.8 V and 3.3 V rails with fast enable/disable for duty-cycled sensing. Use Value: 55 µA quiescent current extends battery life beyond 12 months; output discharge ensures rapid sensor reset between measurements. |
Use Scenario: Supplying isolated analog input channels (e.g., 4–20 mA receivers) and digital isolators in harsh factory-floor environments. IC Role / Device Role / Timing Role: Local post-regulator converting switched 5 V or 12 V bus to precise 2.5 V reference and 3.3 V logic supply. Use Value: ±2.0% output accuracy and 55 dB SVR maintain ADC linearity despite noisy plant-floor power; −40 °C to +125 °C rating ensures reliability. |
| Set-Top Box USB Hub Controller | Laptop Embedded Controller (EC) |
|
Use Scenario: Delivering stable 1.2 V core and 3.3 V I/O power to a USB 2.0 hub IC sharing a 5 V SMPS rail. IC Role / Device Role / Timing Role: Low-noise point-of-load regulator decoupling digital switching noise from sensitive USB PHY circuitry. Use Value: 20 µVRMS noise prevents packet errors; 100 mV dropout allows operation even as input rail sags during peak USB load transients. |
Use Scenario: Providing always-on 3.3 V supply to laptop EC managing keyboard, lid switch, and battery fuel gauging during S3/S4 sleep states. IC Role / Device Role / Timing Role: Always-on LDO with hardware-enforced shutdown during main CPU power-off sequences. Use Value: <1 µA off-mode current meets ACPI S5 leakage budgets; EN pin synchronizes with chipset power-good signals for deterministic wake timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B332MR-G | 200 mA, 150 mV dropout @ 100 mA, no EN or discharge; SOT-25 only. | Lacks enable/shutdown and output discharge - unsuitable for power-sequenced systems requiring controlled VOUT ramp-down. | Select only if board space permits larger SOT-25 and system design omits active discharge requirements. |
| Analog Devices ADM7172ACPZ-3.3-R7 | 200 mA, 120 mV dropout @ 200 mA, 2.5 µA IQ, includes soft-start; 8-lead LFCSP. | Higher cost, larger package, and soft-start add complexity where rapid enable/disable is required. | Prefer when soft-start is mandatory to prevent inrush into large capacitive loads; avoid if minimizing footprint and IQ is primary goal. |
Compared with XC6210B332MR-G and ADM7172ACPZ-3.3-R7, the LDK220PU-R uniquely combines ultra-low IQ (55 µA), integrated discharge, and DFN6 compactness - making it optimal for battery-critical, space-constrained designs needing deterministic power control.
Availability
LDK220PU-R is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, set-top box USB hubs, and laptop embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LDK220PU-R 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 quiescent current, fast transient response, and robust protection features are mandatory.
FAQ
What is the minimum output capacitor value required for stability with LDK220PU-R?
The LDK220PU-R is stable with a minimum 1 µF X5R or X7R ceramic capacitor on the output. This value is validated across all operating conditions including −40 °C to +125 °C and 1 mA to 200 mA load range. Larger values up to 22 µF improve transient response but are not required for basic stability.
Can the ADJ pin be left unconnected when using LDK220PU-R in fixed-output mode?
No - the LDK220PU-R is the adjustable version; the ADJ pin must be connected to the output through a resistor divider to set the desired voltage. Leaving ADJ floating causes undefined regulation behavior and potential output instability. Fixed-output variants use different order codes (e.g., LDK220PU33R for 3.3 V).
Does LDK220PU-R require an input capacitor, and what type is recommended?
Yes - a 1 µF ceramic capacitor is required on the IN pin, placed as close as possible to pins 6 (IN) and 5 (GND). X5R or X7R dielectrics are recommended for stable capacitance over temperature and bias. This capacitor reduces input impedance and suppresses high-frequency noise from upstream power sources.
How does the output discharge function behave during EN deactivation?
When EN is driven low, the internal 18 Ω discharge resistor connects VOUT to GND, actively pulling the output voltage down within microseconds. This prevents residual charge from interfering with downstream logic states or causing latch-up. External voltage must never be applied to VOUT while EN is low, as it may damage the discharge path.
LDK220PU-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-XFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13.2V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 60dB ~ 45dB (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)
LDK220PU-R FAQ
1.How can I place an order for LDK220PU-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDK220PU-R 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 LDK220PU-R reliable?
The price and inventory of LDK220PU-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK220PU-R is usually 5 days.
3.What payment methods are accepted for LDK220PU-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK220PU-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDK220PU-R?
LDK220PU-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDK220PU-R 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 LDK220PU-R?
For technical support, including LDK220PU-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK220PU-R requirements.
6.How does Aetrix verify that LDK220PU-R is sourced from the original manufacturer or authorized distributors?
All LDK220PU-R 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 LDK220PU-R meets industry standards.
7.What is the process for return or replacement of LDK220PU-R?
All LDK220PU-R units undergo pre-shipment inspection (PSI). If there is an issue with LDK220PU-R, 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 LDK220PU-R part is unused and in its original packaging.
Return procedure for LDK220PU-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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