STLQ020PUR - 200mA Ultra-Low Iq LDO 2V-5.5V | STMicroelectronics
MPN: STLQ020PUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.76 | $0.76 |
| 10 | $0.68 | $6.80 |
| 100 | $0.53 | $53.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.35 | $350.00 |
STLQ020PUR Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage by dissipating excess energy as heat, even when the input-to-output voltage differential is very small. LDOs sit within the broader hierarchy of power management ICs and are typically chosen over switching regulators in noise-sensitive or low-power applications because they introduce no switching ripple and require only small input/output capacitors. The STLQ020 belongs to the "ultra-low quiescent current" sub-category, where nanoamp-level Iq enables multi-year battery life in always-on systems.
Key features of the STLQ020PUR include a 160 mV typical dropout at full 200 mA load, an enable pin that drops total current consumption to 5 nA in shutdown, and stable operation with low-ESR ceramic output capacitors as small as 1 uF. Built-in protections include thermal shutdown and short-circuit current limiting, and the exposed-pad package keeps junction temperature rise manageable at typical 50-100 mA portable loads.
Internally, the regulator uses a CMOS pass element driven by a precision bandgap reference and an error amplifier optimized for low bias current. Compared with bipolar LDOs of similar rating, this CMOS architecture keeps quiescent current in the low microamp range even during dropout, which is critical when the battery voltage approaches the regulated rail and the regulator is barely regulating.
Typical applications include coin-cell-powered IoT nodes, wearables and hearables, remote controls, BLE/Zigbee sensor modules, and standby rails of always-on microcontrollers. The wide enable range and tiny DFN-6 footprint also make it suitable as a post-regulator following a switching pre-regulator in space-constrained PMUs.
When designing with the STLQ020PUR, keep the trace from ADJ pin to the feedback resistor divider short to minimize noise pickup, place the input/output ceramic capacitors within 1-2 mm of the package, and verify that worst-case VIN minus VOUT does not exceed the 160 mV dropout budget at peak load.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Distributor stock and pricing were verified against DigiKey and Mouser as of 2026-10-10.
Drop-in alternatives for STLQ020PUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STLQ020PU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STLQ020PG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STLQ020PUR Maximum Ratings & Electrical Characteristics
| Regulator Type | LDO, Positive Adjustable |
| Number of Outputs | 1 |
| Input Voltage Range | 2 V to 5.5 V |
| Output Voltage Range | 0.8 V to 4.5 V (adjustable) |
| Maximum Output Current | 200 mA |
| Dropout Voltage (typical) | 160 mV at 200 mA |
| Quiescent Current (typ) | Ultra-low (uA range) |
| Shutdown Current | 5 nA typical |
| Output Capacitor | 1 uF ceramic (low-ESR), stable |
| Thermal Shutdown | Yes (internal) |
| Current Limit | Yes (internal short-circuit protection) |
| Enable Pin | Yes (active-high, 5 nA shutdown) |
| Operating Temperature | -40 C to +125 C |
| Package | 6-DFN (2x2 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
STLQ020PUR Pin Configuration
| Pin 1 | VIN — Input supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | EN — Enable (active-high) |
| Pin 4 | ADJ — Adjust / feedback |
| Pin 5 | NC — Not connected |
| Pin 6 | VOUT — Regulated output voltage |
Typical Applications
STLQ020PUR is suitable for 7 applications: Coin-Cell IoT Sensor Node, Wearable Heart-Rate / Hearable, Remote Control / Wireless Keyboard, Standby Rail for Always-On Microcontroller, Sensor Module Power Tree (Post-Regulator), Battery-Powered Medical Patch, IoT Smart-Home Sensor.
Coin-Cell IoT Sensor Node
Regulates a coin-cell or lithium battery down to a stable 1.8 V or 3.3 V rail for an ultra-low-power MCU and sensor in a wireless IoT node. The STLQ020PUR's 5 nA shutdown current and ultra-low quiescent current dominate multi-year battery-life budgets, while 200 mA peak current covers radio TX bursts. Place the 1 uF ceramic output cap within 2 mm of VOUT. Dropping in a switching pre-regulator upstream would only add ripple that disturbs ADC readings, so a pure LDO is preferred here.
Recommended
Wearable Heart-Rate / Hearable
Powers the always-on domain of a wristband or hearable, including a low-power MCU, accelerometer, and PPG sensor front-end. The STLQ020PUR's 6-DFN (2x2 mm) footprint fits inside compact wristband PCBs, and the 5 nA shutdown mode lets the host turn the rail off entirely during deep sleep. Compared with a buck converter it adds zero switching noise, which is critical for clean PPG photodiode biasing. Designers should budget worst-case VIN minus VOUT to stay within the 160 mV dropout window at peak sensor duty cycle.
Recommended
Remote Control / Wireless Keyboard
Drives the MCU and RF transmitter in an IR/RF remote, drawing from two AAA cells or a coin cell. The STLQ020PUR's wide 2 V-5.5 V input range accommodates the entire discharge curve of alkaline or NiMH cells without a boost stage. Its high PSRR cleans up the residual switching ripple from any upstream boost used for the IR LED. The enable pin lets the MCU gate the rail during sleep, extending shelf life to multiple years on a single coin cell.
Recommended
Standby Rail for Always-On Microcontroller
Acts as a dedicated standby LDO that remains on while the main system rail is switched off, providing retention power to RTC, SRAM, and wake-up logic. The STLQ020PUR's 5 nA shutdown current on EN means the rail itself can be gated, and its ultra-low Iq prevents the standby battery from discharging during months of storage. For battery-backed RTC designs this part replaces legacy CMOS LDOs that wasted more current in quiescent than the RTC consumed. Place a small capacitor at EN to filter false wake-ups.
Recommended
Sensor Module Power Tree (Post-Regulator)
Sits downstream of a switching pre-regulator in mixed-rail sensor modules, providing a clean, low-noise output for analog front-ends and precision ADCs. The STLQ020PUR's high PSRR attenuates the residual switching ripple from the buck stage, and the 200 mA rating supports most analog signal chains. The exposed pad must be soldered to a thermal copper pour to handle sustained loads above 100 mA. Compared to an LDO with higher minimum-Iq, this part adds negligible current to the standby budget.
Recommended
Battery-Powered Medical Patch
Regulates a single-cell Li-ion or Li-polymer battery down to 1.8 V or 2.5 V for a continuous-glucose-monitor patch or similar low-power medical sensor. The STLQ020PUR's tiny DFN-6 footprint fits inside the patch's flex PCB, and its low quiescent current directly extends wear-time. The exposed pad enables adequate heat dissipation for sustained sensor bias currents. Engineers should verify the part's moisture-sensitivity level with ST before designing the manufacturing process flow.
Recommended
IoT Smart-Home Sensor
Powers a Zigbee, Thread, or Matter-based environmental sensor (temperature, humidity, air quality) from two AA cells. The STLQ020PUR's wide input range accepts the full discharge curve of alkalines, eliminating the need for a boost converter. The 200 mA peak covers the radio's TX burst, and the enable pin lets the MCU switch the LDO off entirely for sub-uA sleep. Compared with higher-Iq regulators this part adds months to battery-replacement intervals.
Recommended
Recommended Products Summary
Engineering reference data for STLQ020PUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STLQ020PU | STLQ020PG | LP2985AIM5-3.3/NOPB | MIC5205-3.3YM5-TR | TLV1117LV33DCYR |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | Microchip Technology | Texas Instruments |
| Package | 6-DFN (2x2) | 6-DFN (2x2) - same | 6-DFN (2x2) - same | SOT-23-5 | SOT-23-5 | SOT-223 |
| Maximum Output Current | 200 mA | 200 mA | 200 mA | 150 mA | 150 mA | 1 A |
| Input Voltage Range | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2.2 V to 16 V | 2.5 V to 16 V | 1.4 V to 5.5 V |
| Dropout Voltage | 160 mV at 200 mA | 160 mV at 200 mA | 160 mV at 200 mA | 280 mV at 150 mA | 165 mV at 150 mA | 455 mV at 1 A |
| Quiescent Current | Ultra-low (uA range), 5 nA shutdown | Ultra-low (uA range) | Ultra-low (uA range) | 850 uA typical | 180 uA typical | 100 uA typical |
| Output Voltage | 0.8 V to 4.5 V adjustable | 0.8 V to 4.5 V adjustable | 0.8 V to 4.5 V adjustable | Fixed 3.3 V | Fixed 3.3 V | Fixed 3.3 V |
| Enable Pin | Yes (active-high, 5 nA off) | Yes | Yes | Yes | No | No |
Key Differentiators
- Lowest quiescent current in a 200 mA 6-DFN LDO (vs LP2985AIM5-3.3/NOPB)
- Tiny 2x2 mm DFN footprint for wearable designs (vs MIC5205-3.3YM5-TR)
- Ultra-low dropout at 200 mA (vs TLV1117LV33DCYR)
Design Notes
Estimated: at VIN=3.7 V, VOUT=1.8 V, IOUT=200 mA the dissipation is (3.7-1.8)x0.2 = 0.38 W. The DFN-6 exposed pad has a typical theta_JA around 60-80 C/W on a 1-oz 1 sq-in copper pour, yielding a junction rise of 25-30 C above ambient. For continuous 200 mA loads on small PCBs (wearables, hearing aids) confirm the actual theta_JA with thermal via arrays under the exposed pad and adequate copper. Avoid running the part at maximum current on a flex PCB with minimal copper.
Place the input and output 1 uF ceramic capacitors within 1-2 mm of the VIN and VOUT pins respectively, using X5R or X7R dielectric. Keep the ADJ feedback trace short to avoid noise pickup on the high-impedance node. Solder the exposed thermal pad to a copper pour stitched with thermal vias to the bottom layer for best heat dissipation. Avoid routing noisy digital lines (radio, motor driver) under the LDO's inductor or feedback trace.
Do not operate continuously with VIN below VOUT + 160 mV - the LDO will drop out and VOUT will sag below regulation, potentially causing brown-outs on the load. Ensure the EN pin is not left floating - use a 100 kohm pull-down to guarantee a defined off state during power-up. Do not exceed 5.5 V on VIN even briefly, as the absolute-maximum rating can cause permanent damage. For adjustable versions use 1% feedback resistors to maintain output accuracy across temperature.
Compliance Information
RoHS-compliant per ST product page. Not AEC-Q100 qualified; for automotive applications use an AEC-Q100-qualified LDO such as ST's automotive-grade portfolio. Halogen-free status not stated in datasheet - request the ST MDDS for confirmation.
