STMicroelectronics STEVAL-ISB034V1

Overview

STEVAL-ISB034V1 from STMicroelectronics is an evaluation board for the LDBL20 200 mA low-dropout linear regulator, configured to deliver a precise 2.5 V ±2% output from 2.85–5.5 V input. It features 80 dB PSRR at 1 kHz, 20 μA typical quiescent current at no load, and uses only two 1 μF ceramic capacitors. Designed for space-constrained, battery-powered applications including smartphones and wearables.

For engineers reviewing the STEVAL-ISB034V1 datasheet, STEVAL-ISB034V1 pinout, STEVAL-ISB034V1 application, or STEVAL-ISB034V1 equivalent, this board enables rapid validation of the LDBL20's ultra-low quiescent current (0.03 μA in off mode), miniature ST Stamp™ 0.47 × 0.47 mm² CSP package, and high-PSRR performance in portable power rail design.

Technical Context

The board implements the LDBL20D-25R variant with fixed 2.5 V output, logic-controlled enable (EN) functionality, and dual-input/dual-output terminal configuration to minimize PCB parasitics and improve noise rejection. Input filtering uses parallel Vin_f/Vin_s paths, while output employs Vout_f/Vout_s separation for enhanced high-frequency PSRR.

Designed around ST's bumpless chip-scale packaging, the board supports direct integration into compact layouts without solder mask defined pads or thermal vias-critical for wearable device form factors where board area and thermal mass are tightly constrained.

Key Specifications

Availability

STEVAL-ISB034V1 is available at Aetrix Electronics and suitable for smartphone power validation, wearable device battery management, and IoT sensor node LDO qualification requiring stable component supply and documented reference design implementation.

Supply support for STEVAL-ISB034V1 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, delivering microcontrollers, power management ICs, sensors, and analog solutions for automotive, industrial, and consumer markets.

The STEVAL-ISB034V1 belongs to ST's ST Evaluation Board product line, engineered to accelerate adoption of ultra-miniature, high-PSRR LDOs in battery-sensitive portable electronics.

FAQ

What is the primary function of the STEVAL-ISB034V1 board?

The STEVAL-ISB034V1 is a dedicated evaluation platform for the LDBL20 200 mA LDO, pre-configured to deliver 2.5 V ±2% from 2.85–5.5 V input. It validates key performance metrics including PSRR, dropout behavior, and ultra-low quiescent current-without requiring custom layout or component selection.

Does the board include the LDBL20 in its actual production package?

Yes-the board mounts the LDBL20D-25R in its native ST Stamp™ bumpless CSP package (0.47 × 0.47 mm²). The layout replicates recommended pad geometry and thermal relief per ST's AN4629, enabling direct correlation between evaluation results and final PCB performance.

Can the output voltage be adjusted on this board?

No-STEVAL-ISB034V1 is factory-configured for fixed 2.5 V output using the LDBL20D-25R variant. Adjustable versions (e.g., LDBL20ADxx) require different boards or custom modifications; this board does not support resistor-divider feedback rework.

What external components are required to operate the board?

Only two 1 μF X5R/X7R ceramic capacitors (C1 and C2) are required-one on the input (Vin_f/Vin_s) and one on the output (Vout_f/Vout_s). No additional resistors, inductors, or bias networks are needed; the EN pin is routed to header CN1 for external logic control.