STMicroelectronics STLQ020PU33R

Overview

STLQ020PU33R from STMicroelectronics is a 200 mA ultra-low-quiescent-current low-dropout (LDO) voltage regulator in DFN6-2x2 package, delivering fixed 3.3 V output with ±2% accuracy at 25 °C 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 and wearable systems.

For engineers reviewing the STLQ020PU33R datasheet, STLQ020PU33R pinout, STLQ020PU33R application, or STLQ020PU33R equivalent, key selection criteria include its sub-1 µA shutdown current (5 nA typ.), adaptive biasing for fast transient response, logic-controlled EN pin, integrated thermal/overcurrent protection, and support for 1 µF ceramic input/output capacitors without external compensation.

Technical Context

The STLQ020PU33R employs a PMOS pass transistor architecture with adaptive biasing to maintain ultra-low I_q across load and dropout conditions while preserving PSRR >52 dB at 100 Hz and <135 µV_RMS output noise (10 Hz–100 kHz). Its bandgap reference and op-amp error amplifier enable precise output regulation under varying line, load, and temperature conditions.

It integrates a CMOS-compatible enable input (VEN high = ON, low = shutdown), optional output discharge (via NC/ADJ pin configuration), and protection circuitry including constant-current limiting (380 mA typ.) and thermal shutdown with 20 °C hysteresis (trip at 160 °C, recover at ~140 °C).

Key Specifications

Pinout & Package

STLQ020PU33R is supplied in a thermally enhanced DFN6-2x2 (2.0 mm × 2.0 mm, 0.75 mm height) package with exposed pad for improved heat dissipation (R_thJA = 65 °C/W). The pinout is validated per DS12072 Rev 4, page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and ADP160AUJZ-3.3-R7, STLQ020PU33R uniquely combines 5 nA shutdown, integrated thermal protection, 200 mA capability, and DFN6-2x2 thermal efficiency-making it the only choice for long-life, high-reliability, duty-cycled industrial and medical edge nodes.

Availability

STLQ020PU33R is available at Aetrix Electronics and suitable for smartphone image sensor power, medical wearable ECG front-ends, and smart meter RTC circuits requiring stable component supply across extended product lifecycles.

Supply support for STLQ020PU33R 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 STLQ020 series belongs to ST's ultra-low-power LDO portfolio, engineered specifically for battery-operated edge devices demanding nanowatt quiescent consumption, robust protection, and minimal PCB footprint without sacrificing regulation precision or transient performance.

FAQ

What is the minimum input voltage required for STLQ020PU33R to regulate 3.3 V at 200 mA?

The minimum input voltage is 3.46 V, calculated as VOUT + VDROP = 3.3 V + 0.16 V. Below this, the device enters dropout mode and output voltage declines linearly with VIN. At 20 mA load, dropout drops to 15 mV, enabling regulation down to 3.315 V.

Can STLQ020PU33R be used with ceramic capacitors smaller than 1 µF?

No-STMicroelectronics specifies a minimum 1 µF low-ESR ceramic capacitor on both input and output to guarantee loop stability across temperature and load. Using smaller values risks oscillation, especially with X7R/X5R types exhibiting capacitance roll-off above 1 MHz.

Is the exposed pad on the DFN6-2x2 package electrically connected?

Yes-the exposed pad is internally connected to GND and must be soldered to a dedicated PCB ground plane. Thermal vias (≥4, 0.3 mm diameter) are required to achieve the rated R_thJA of 65 °C/W; omitting them raises junction temperature by up to 45 °C at full load.

Does STLQ020PU33R support remote sensing or adjustable output voltage?

No-STLQ020PU33R is a fixed 3.3 V output variant. Adjustable versions (e.g., STLQ020PUR) use the ADJ pin and external resistor divider, but PU33R has NC/ADJ internally disconnected. Remote sensing is not supported in any STLQ020 variant.