STMicroelectronics STLQ020J25R

Overview

STLQ020J25R from STMicroelectronics is a 200 mA ultra-low-quiescent-current low-dropout (LDO) voltage regulator in Flip-Chip4 package, delivering fixed 2.5 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 load, 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 STLQ020J25R datasheet, STLQ020J25R pinout, STLQ020J25R application, or STLQ020J25R equivalent, key selection criteria include its 300 nA no-load I_q, 160 mV dropout at full load, logic-controlled shutdown (5 nA off-state), integrated thermal/overcurrent protection, and support for 1 µF ceramic input/output capacitors in space-constrained portable systems.

Technical Context

The STLQ020J25R uses an adaptive biasing circuit to maintain ultra-low quiescent current while delivering fast transient response and 52 dB PSRR at 100 Hz (V_OUT = 2.5 V, I_OUT = 10 mA). Its internal bandgap reference and CMOS-compatible enable pin (VEN low = 0.4 V max, high = 1.2 V min) ensure precise turn-on/turn-off control without external pull-ups.

Thermal protection activates at 160 °C with 20 °C hysteresis, and short-circuit current is internally limited to 380 mA typ. The device sustains stable operation with 1 µF X5R/X7R ceramic capacitors (ESR 3–500 mΩ), and its Flip-Chip4 package provides low R_thJA of 130 °C/W for efficient heat dissipation in thin-profile designs.

Key Specifications

Pinout & Package

STLQ020J25R is packaged in Flip-Chip4 (0.773 mm × 0.773 mm, 0.26 mm height), featuring solder bumps on bottom side for direct die-to-PCB interconnect and optimized thermal path via exposed substrate. The package has no leads; terminals are accessed through four solder pads labeled A1, A2, B1, B2 per datasheet Figure 38.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B252MR-G and ADP160ACBZ-2.5-R7, STLQ020J25R delivers the lowest dropout (160 mV) and lowest no-load I_q (300 nA) in the smallest package (Flip-Chip4), making it optimal for space- and battery-limited IoT edge nodes where every nanocoulomb and millivolt matters.

Availability

STLQ020J25R is available at Aetrix Electronics and suitable for smartphone image sensor power, wearable health monitoring, portable medical diagnostics, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STLQ020J25R 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-powered portable electronics where multi-year standby life, minimal PCB area, and guaranteed performance across automotive-grade temperatures are mandatory.

FAQ

What is the minimum input voltage required for STLQ020J25R to regulate 2.5 V output at 200 mA?

The minimum input voltage is 2.66 V, calculated as V_OUT + V_DROP = 2.5 V + 0.16 V. Below this, the device enters dropout mode-still regulating but with reduced PSRR and increased sensitivity to input ripple. Datasheet Table 4 confirms 160 mV dropout at 200 mA load and 25 °C.

Does STLQ020J25R require an external resistor divider for 2.5 V output?

No. STLQ020J25R is a fixed-output version (2.5 V) in Flip-Chip4 package; the ADJ pin is not present. Only adjustable versions (e.g., STLQ020PUR in DFN6-2x2) include the ADJ terminal and require external resistors. Pin configuration Table 1 explicitly lists NC/ADJ as "Not connected on the fixed version" for Flip-Chip4.

Can STLQ020J25R be used with 0.5 µF output capacitance?

No. The datasheet mandates ≥1 µF ceramic output capacitance (X5R/X7R) with ESR between 3 mΩ and 500 mΩ for loop stability. Using 0.5 µF risks oscillation or load-transient overshoot, as confirmed in Section 7.1 and Figure 28–31 transient response plots with 1 µF C_OUT.

Is the exposed substrate of the Flip-Chip4 package electrically connected?

No. The Flip-Chip4 package substrate is non-conductive and serves solely as a mechanical carrier and thermal conduction path. Datasheet Figure 38 and Table 7 show no electrical designation for the substrate; thermal vias should connect underlying GND copper, not the substrate itself.