STMicroelectronics STLQ020PUR

Overview

STLQ020PUR from STMicroelectronics is an adjustable 200 mA ultra-low-quiescent-current LDO voltage regulator in DFN6-2x2 package, operating from 2 V to 5.5 V input, delivering 0.8 V to 4.5 V output (50 mV step), with 160 mV dropout at 200 mA and ±2% output accuracy at room temperature. It enables long battery life in always-on image sensors and wearable healthcare monitors.

For engineers reviewing the STLQ020PUR datasheet, STLQ020PUR pinout, STLQ020PUR application, or STLQ020PUR equivalent, key selection criteria include its 300 nA no-load quiescent current, logic-controlled shutdown (5 nA off-state), output discharge capability, adaptive biasing for fast transient response, and thermal/overcurrent protection across –40 °C to +125 °C.

Technical Context

The STLQ020PUR implements a CMOS-based low-dropout regulator architecture with an internal bandgap reference, adaptive biasing circuitry for load-dependent quiescent current control, and a PMOS pass transistor enabling ultra-low I_q even in dropout. Its enable pin directly controls gate bias of the pass device without internal pull-up.

It supports both fixed-output and adjustable configurations via the ADJ pin (connected to external resistor divider), where V_OUT = 0.8 V × (1 + R1/R2). Output discharge is implemented through an internal 100 Ω NMOS switch activated during shutdown, ensuring rapid V_OUT decay.

Key Specifications

Pinout & Package

STLQ020PUR is supplied in DFN6-2x2 (2.0 mm × 2.0 mm, 0.65 mm pitch) with exposed thermal pad requiring GND connection. Pin 1 (A1) is VIN; Pin 2 (B2) is NC/ADJ; Pin 3 (B1) is EN; Pin 4 (A2) is VOUT; Pin 5 (B2) is GND; Pin 6 (A1) is GND (exposed pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and ADM7172ACPZ-1.8-R7, STLQ020PUR uniquely balances sub-µA quiescent current, adjustable output, integrated output discharge, and full protection suite in a 2×2 mm DFN - making it optimal for space-constrained, battery-limited systems requiring flexible voltage scaling.

Availability

STLQ020PUR is available at Aetrix Electronics and suitable for smartphones/tablets, image sensors, wearable accessories, healthcare devices, and metering requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for STLQ020PUR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The STLQ020 series belongs to ST's ultra-low-I_q LDO product line, engineered specifically for battery-powered edge devices demanding multi-year operation without maintenance.

FAQ

What output voltage range does STLQ020PUR support?

STLQ020PUR supports adjustable output from 0.8 V to 4.5 V in 50 mV increments, set via external resistor divider on the ADJ pin using V_OUT = 0.8 V × (1 + R1/R2). The minimum output is constrained by the 0.8 V internal reference; maximum is limited by (VIN – V_DROP), where V_DROP is 160 mV at 200 mA.

How is the exposed thermal pad on the DFN6-2x2 package used?

The exposed pad on STLQ020PUR must be soldered to a dedicated GND copper pour on the PCB, with ≥4 thermal vias (0.3 mm diameter) connecting to inner or backside ground planes. This reduces R_thJA from 250 °C/W (no pad) to 65 °C/W, enabling 200 mA continuous operation at 60 °C ambient without derating.

Does STLQ020PUR require specific output capacitor ESR values?

Yes - STLQ020PUR requires an output capacitor with ESR between 3 mΩ and 500 mΩ (e.g., X5R/X7R ceramic) and minimum 1 µF capacitance. Capacitors outside this range risk instability or oscillation. The ESR must remain within bounds across –40 °C to +125 °C and full load range to ensure loop stability.

Can STLQ020PUR operate with input voltage below 2 V?

No - the absolute minimum operating input voltage is 2 V per datasheet Table 4. Operation below 2 V risks loss of regulation, increased dropout, or undefined behavior. At VIN = 2 V, the device delivers full 200 mA only if V_OUT ≤ 1.84 V (2 V – 160 mV); lower outputs are supported, but not higher.