STMicroelectronics STLQ020PU28R

Overview

STLQ020PU28R from STMicroelectronics is a 200 mA ultra-low-quiescent-current low-dropout (LDO) voltage regulator in DFN6-2x2 package, delivering fixed 2.8 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 wearable and medical sensors.

For engineers reviewing the STLQ020PU28R datasheet, STLQ020PU28R pinout, STLQ020PU28R application, or STLQ020PU28R equivalent, key selection criteria include its controlled I_q in dropout, logic-enabled shutdown (5 nA off-state), output discharge option, thermal/overcurrent protection, and compatibility with 1 µF ceramic input/output capacitors.

Technical Context

The STLQ020PU28R uses an adaptive biasing circuit to maintain fast transient response and 52 dB PSRR at 100 Hz while sustaining ultra-low I_q. Its internal bandgap reference and CMOS-compatible enable input (VEN high = ON, low = OFF) support precise power sequencing in compact portable systems.

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 sub-µA operation. The fixed-output version omits ADJ pin functionality and routes NC to GND via exposed pad.

Key Specifications

Pinout & Package

STLQ020PU28R is housed in a thermally enhanced DFN6-2x2 (2.0 mm × 2.0 mm, 0.75–0.95 mm height) package with exposed thermal pad requiring GND connection. Pin 1 (VIN) accepts 2–5.5 V input; Pin 2 (NC) is internally unconnected and may be tied to GND; Pin 3 (GND) is ground reference; Pin 4 (EN) enables logic-controlled on/off; Pin 5 (VOUT) delivers regulated 2.8 V; Pin 6 (GND) is secondary ground terminal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with XC6210B282MR-G and RT9013-28GB, STLQ020PU28R uniquely combines sub-µA quiescent current, 160 mV dropout, and DFN6-2x2 footprint-making it optimal for space-constrained, battery-limited applications where runtime and thermal performance are critical.

Availability

STLQ020PU28R is available at Aetrix Electronics and suitable for smartphone camera modules, wearable biosensors, portable medical diagnostics, smart meter RF subsystems, and industrial handheld terminals requiring stable component supply across extended product lifecycles.

Supply support for STLQ020PU28R 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, sensors, and analog components for industrial, automotive, and consumer markets.

The STLQ020 series belongs to ST's ultra-low-power LDO portfolio, engineered specifically for battery-powered portable electronics demanding multi-year operational life, minimal thermal footprint, and guaranteed performance across automotive-grade temperature ranges.

FAQ

What is the minimum input voltage required for STLQ020PU28R to regulate 2.8 V output?

The minimum input voltage is 2.96 V-calculated as VOUT + VDROP = 2.8 V + 160 mV-ensuring regulation under full 200 mA load. At lighter loads, regulation begins as low as 2.815 V due to reduced dropout (15 mV at 20 mA). Input below 2 V is prohibited per absolute maximum ratings.

Can STLQ020PU28R be used with ceramic capacitors smaller than 1 µF?

No. The datasheet mandates ≥1 µF ceramic input and output capacitors with ESR between 3 mΩ and 500 mΩ for guaranteed loop stability. Using smaller values risks oscillation, excessive ringing on load transients, and failure to meet PSRR or noise specifications-even if the device appears functional in bench tests.

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

Yes-the exposed pad is internally connected to GND and must be soldered to a PCB copper pour tied to system ground. This connection provides the primary thermal conduction path (R_thJC = 15 °C/W) and improves power dissipation capability by up to 4× compared to using only perimeter leads.

Does STLQ020PU28R support remote sensing of the output voltage?

No. STLQ020PU28R is the fixed-output variant and lacks the ADJ pin required for remote sensing. Only adjustable versions (e.g., STLQ020PUR) provide the ADJ terminal and internal 0.8 V reference for resistor-divider feedback; this part uses internal trimming for 2.8 V output and has NC on Pin 2.