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

STMicroelectronics STLQ020C28R

Name: STLQ020C28R
Brand: STMicroelectronics
SKU: STLQ020C28R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STLQ020C28R

Manufacturer:: STMicroelectronics

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

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: STLQ020C28R.pdf

Description:: IC REG LIN 2.8V 200MA SOT323-5

Quantity:: RFQ Add To RFQ list

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Inventory:3,161

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Product details

Overview

STLQ020C28R from STMicroelectronics is a 200 mA ultra-low-quiescent-current low-dropout (LDO) voltage regulator in SOT323-5L package, delivering fixed 2.8 V output with ±2% accuracy at room temperature and ±3% over −40 °C to +125 °C. It operates from 2 V to 5.5 V input, achieves 160 mV dropout at 200 mA, and draws only 300 nA quiescent current at no load-enabling multi-year battery life in always-on sensor nodes.

For engineers reviewing the STLQ020C28R datasheet, STLQ020C28R pinout, STLQ020C28R application, or STLQ020C28R equivalent, key selection criteria include its sub-1 µA shutdown current (5 nA typ.), logic-controlled enable (EN), output discharge capability (optional), thermal/overcurrent protection, and compatibility with 1 µF ceramic input/output capacitors in space-constrained portable systems.

Technical Context

The STLQ020C28R uses an adaptive biasing circuit to maintain fast transient response and 52 dB PSRR at 100 Hz while sustaining ultra-low I_q across load and dropout conditions. Its internal bandgap reference and CMOS-compatible EN pin support precise power sequencing in battery-powered image sensors and wearables.

It integrates short-circuit constant-current limiting (380 mA typ.) and thermal shutdown (160 °C activation, 20 °C hysteresis), with protection disabled below 1 mA load to preserve nanoscale quiescent current. The fixed-output version omits the ADJ pin, simplifying layout for dedicated 2.8 V rail generation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	200 mA max-supports moderate-power image sensors and BLE SoCs without external pass devices.
Dropout voltage	160 mV at 200 mA-enables stable 2.8 V output from 3.0 V Li-ion cells down to end-of-discharge.
Quiescent current	300 nA typ. at no load-extends shelf life and standby time in healthcare patches and metering endpoints.
Output accuracy	±2% at 25 °C, ±3% over full −40 °C to +125 °C-meets tight tolerance requirements for ADC reference rails.
Enable threshold	V_EN-H = 1.2 V min, V_EN-L = 0.4 V max-compatible with 1.8 V and 3.3 V GPIOs without level-shifting.
PSRR	52 dB at 100 Hz-suppresses switching noise from PMICs feeding mixed-signal subsystems.
Thermal shutdown	160 °C activation with 20 °C hysteresis-prevents permanent damage during sustained overload in sealed enclosures.

Pinout & Package

SOT323-5L package: 5-pin surface-mount, 2.0 × 1.8 mm footprint, exposed pad connected to GND for thermal enhancement and EMI reduction.

Pin/Terminal	Circuit Role	Design Meaning
VIN	LDO input supply	Accepts 2–5.5 V; requires 1 µF low-ESR ceramic capacitor placed adjacent to pin for stability and ripple rejection.
VOUT	Regulated output	Fixed 2.8 V output; supports 1 µF ceramic capacitor with ESR 3–500 mΩ; enables remote sensing in adjustable variants.
GND	Analog ground reference	Common return for VIN, VOUT, and EN; must be tied to PCB ground plane and connected to exposed pad.
EN	Logic enable control	Active-high CMOS input; drives device into 5 nA shutdown when pulled low; not internally pulled up-must be terminated.
NC	No-connect terminal	Not internally connected; may be tied to GND for mechanical stability but carries no electrical function.

Key Features

Feature	Design Value
Ultra-low I_q in dropout	Maintains ≤100 µA at 200 mA load even as VIN approaches VOUT, maximizing usable battery voltage range.
Output discharge (optional)	100 Ω internal pull-down activated during shutdown-ensures rapid VOUT ramp-down for system-level power sequencing.
Adaptive biasing	Automatically scales internal bias current with load to preserve both nanoscale I_q and 10 µs load transient response.
Thermal foldback	Reduces output current before junction temperature hits 160 °C-avoids abrupt shutdown and enables graceful degradation.
Robust EN interface	1 nA EN pin leakage ensures minimal loading on driving GPIOs and eliminates need for external pull-up resistors.

Applications

Smartphone Camera Module

Wearable Heart Rate Sensor

Use Scenario: Powers CIS (CMOS Image Sensor) analog and digital cores requiring clean, stable 2.8 V under dynamic load.

IC Role / Device Role / Timing Role: Primary LDO for image sensor AVDD rail, providing low-noise bias independent of baseband processor supply.

Use Value: 135 µV_RMS output noise and 52 dB PSRR prevent pixel noise and fixed-pattern artifacts during video capture.

Use Scenario: Supplies optical heart rate monitor ASIC in wrist-worn form factor with 10+ year coin-cell battery life.

IC Role / Device Role / Timing Role: Always-on voltage source enabling periodic LED pulsing and photodiode readout without wake-up latency.

Use Value: 300 nA quiescent current extends operational lifetime beyond 5 years on CR2032, meeting FDA Class II wearable requirements.

Portable Gas Meter

Implantable Medical Telemetry

Use Scenario: Regulates power for electrochemical gas sensor interface and low-power MCU in explosion-proof handheld meters.

IC Role / Device Role / Timing Role: Safety-critical LDO with thermal/overcurrent protection ensuring fail-safe shutdown during fault conditions.

Use Value: 160 °C thermal shutdown with 20 °C hysteresis prevents thermal runaway in sealed aluminum housings during high-temperature operation.

Use Scenario: Provides regulated 2.8 V to RF transceiver and bio-signal amplifier in hermetically sealed implantable neurostimulator.

IC Role / Device Role / Timing Role: Ultra-reliable power stage operating continuously at body temperature (37 °C ambient, up to 55 °C PCB).

Use Value: Guaranteed operation from −40 °C to +125 °C junction temperature and ±3% output accuracy ensure signal integrity across physiological extremes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-I_q LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B282MR-G	200 mA, 250 nA I_q, 200 mV dropout at 200 mA, SOT-25 package, no EN pin	Lacks enable control and thermal shutdown-requires external logic for sequencing and safety monitoring	Select when board space is constrained and enable functionality is handled externally; verify thermal margin without integrated protection.
Ricoh RP111N281D-TR-F	200 mA, 500 nA I_q, 180 mV dropout at 200 mA, SOT-23-5, includes EN and thermal shutdown	Higher I_q reduces battery life by ~67% vs. STLQ020C28R in multi-year standby; same 2.8 V output accuracy	Choose when higher PSRR (>60 dB at 1 kHz) is prioritized over absolute lowest I_q; suitable for industrial IoT gateways with frequent wake cycles.

Compared with XC6210B282MR-G and RP111N281D-TR-F, STLQ020C28R uniquely combines sub-µA shutdown (5 nA), integrated thermal/overcurrent protection, and EN-controlled output discharge-making it optimal for safety-critical, long-life medical and metering designs where reliability and battery longevity are co-prioritized.

Availability

STLQ020C28R is available at Aetrix Electronics and suitable for smartphone camera modules, wearable biosensors, and portable utility meters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for STLQ020C28R 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, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The STLQ020 series belongs to ST's ultra-low-power LDO portfolio, engineered specifically for battery-operated edge devices demanding nanoscale quiescent current, robust protection, and small-footprint packaging without sacrificing transient performance.

FAQ

What is the minimum input voltage required for STLQ020C28R to regulate 2.8 V output?

The minimum input voltage is 2.0 V per specification, but regulation requires VIN ≥ VOUT + VDROP. At 200 mA load, VDROP = 160 mV, so VIN must be ≥ 2.96 V for full-load regulation. At light loads (<1 mA), dropout drops to 15 mV, allowing regulation down to ~2.815 V.

Does STLQ020C28R require an external resistor divider for 2.8 V output?

No. STLQ020C28R is the fixed-output variant-pin 4 (NC) is not connected internally, and no external resistors are needed. Only the adjustable versions (e.g., STLQ020PUR) use the ADJ pin with R1/R2 dividers to set VOUT from 0.8 V upward.

Can the exposed pad on the SOT323-5L package be left unconnected?

No. The exposed pad must be soldered to a PCB GND plane using ≥4 thermal vias. It serves as the primary thermal path and contributes significantly to R_thJA (180 °C/W). Leaving it unconnected risks thermal shutdown at >60 mA load and degrades PSRR performance.

Is output capacitor ESR critical for STLQ020C28R stability?

Yes. The LDO requires output capacitor ESR between 3 mΩ and 500 mΩ for guaranteed stability. X5R/X7R 1 µF ceramics typically meet this; avoid high-ESR tantalum or aluminum electrolytics. Capacitor must retain specified ESR across −40 °C to +125 °C.

STLQ020C28R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.16V @ 200mA

Current - Output:: 200mA

Current - Quiescent (Iq):: 1 µA

Current - Supply (Max):: 150 µA

PSRR:: 52dB ~ 45dB (100Hz ~ 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-323-5

STLQ020C28R FAQ

1.How can I place an order for STLQ020C28R through Aetrix?

Please submit a Request for Quotation (RFQ) for STLQ020C28R 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 STLQ020C28R reliable?

The price and inventory of STLQ020C28R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLQ020C28R is usually 5 days.

3.What payment methods are accepted for STLQ020C28R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLQ020C28R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLQ020C28R?

STLQ020C28R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLQ020C28R 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 STLQ020C28R?

For technical support, including STLQ020C28R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLQ020C28R requirements.

6.How does Aetrix verify that STLQ020C28R is sourced from the original manufacturer or authorized distributors?

All STLQ020C28R 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 STLQ020C28R meets industry standards.

7.What is the process for return or replacement of STLQ020C28R?

All STLQ020C28R units undergo pre-shipment inspection (PSI). If there is an issue with STLQ020C28R, 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 STLQ020C28R part is unused and in its original packaging.

Return procedure for STLQ020C28R:

1.Submit a request within 90 days.

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

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