STMicroelectronics STEVAL-LDO001V1

Overview

STEVAL-LDO001V1 from STMicroelectronics is an evaluation board for the LDLN025 250 mA ultra-low-noise LDO voltage regulator, designed to demonstrate low-noise power delivery in battery-powered RF and precision analog systems. It supports input voltages from 1.5 V to 5.5 V, delivers up to 250 mA with 6.5 µV_RMS output noise and 80 dB PSRR at 100 Hz, and features logic-controlled shutdown, soft-start, and output discharge - validated on smartphones, image sensors, VCO modules, and instrumentation.

For engineers reviewing the STEVAL-LDO001V1 datasheet, STEVAL-LDO001V1 pinout, STEVAL-LDO001V1 application, or STEVAL-LDO001V1 equivalent, this board enables rapid validation of LDLN025 performance under real-world load transients, dropout conditions, and noise-sensitive supply scenarios - especially where ceramic capacitor stability, sub-250 mV dropout, and <12 µA quiescent current are critical.

Technical Context

The STEVAL-LDO001V1 implements the LDLN025 LDO in a configurable test platform with input/output filtering (1 µF X7R ceramic), jumper-selectable enable control, and exposed thermal pad routing. It supports all three package variants (Flip-Chip4, DFN4-1x1, SOT23-5L) via footprint compatibility and provides direct access to VIN, VOUT, GND, and EN terminals for oscilloscope probing and load switching.

Board-level design reflects LDLN025's internal architecture: bandgap-referenced error amplifier, PMOS pass transistor with controlled I_Q in dropout, thermal shutdown at 160 °C, and internal soft-start limiting inrush current. The layout prioritizes low-inductance paths and ground plane integrity to preserve measured 6.5 µV_RMS noise and 80 dB PSRR performance.

Key Specifications

Availability

STEVAL-LDO001V1 is available at Aetrix Electronics and suitable for RF module validation, portable medical sensor design, and low-power imaging system development requiring stable component supply and fast-turn evaluation capability.

Supply support for STEVAL-LDO001V1 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, specializing in microcontrollers, power management, analog ICs, and automotive-grade components.

The STEVAL-LDO001V1 belongs to ST's evaluation board portfolio for ultra-low-noise LDOs, developed specifically to accelerate design-in of the LDLN025 in noise-critical applications such as mobile RF front-ends and precision data acquisition.

FAQ

What is the primary purpose of the STEVAL-LDO001V1 evaluation board?

The STEVAL-LDO001V1 is a dedicated evaluation platform for the LDLN025 ultra-low-noise LDO regulator. It enables engineers to validate key performance metrics-including output noise (6.5 µV_RMS), PSRR (80 dB @ 100 Hz), dropout behavior (120 mV @ 250 mA), and transient response-under real operating conditions using standard 1 µF ceramic capacitors and configurable enable logic.

Which LDLN025 package variants does the board support?

The STEVAL-LDO001V1 supports all three production packages of the LDLN025: Flip-Chip4 (0.41 mm height), DFN4-1x1 (1.0 mm × 1.0 mm), and SOT23-5L (2.95 mm × 1.60 mm). Its PCB layout includes compatible footprints and thermal pad connections for each, allowing direct soldering and thermal characterization without adapter hardware.

Can the board be used to evaluate different output voltage versions of the LDLN025?

Yes - the STEVAL-LDO001V1 is voltage-agnostic and supports all standard LDLN025 output options (1.0 V to 5.0 V in 50 mV steps), including 2.925 V (LDLN025J2925R). Users select the target variant by populating the corresponding LDLN025 device; no board modification or jumper reconfiguration is required for different V_OUT settings.

Does the board include provisions for measuring ground current and shutdown leakage?

Yes - the board provides test points for VIN, VOUT, GND, and EN, enabling direct current measurement via series ammeter or shunt resistor. Shutdown current (<1 µA) and quiescent current (12 µA typ.) can be accurately measured by disconnecting the EN jumper and monitoring input current while holding EN low, per LDLN025's specified test conditions.