Analog Devices Inc. DC188A-A

Overview

DC188A-A from Analog Devices (formerly Linear Technology) is a demonstration board for the LT1374 500kHz, 4.5A monolithic buck switching regulator in 16-pin TSSOP package. It implements a fixed 5V output with 4.25A continuous load capability, uses all surface-mount components including a 5µH inductor, and supports shutdown and synchronization functions. Designed for evaluation of high-efficiency DC/DC conversion in portable computing and battery-powered systems.

For engineers reviewing the DC188A-A datasheet, DC188A-A pinout, DC188A-A application, or DC188A-A equivalent, this page delivers verified board-level specifications, thermal performance data, supported input voltage range (6V to 25V), measured efficiency curves at 5V/4.25A, and confirmed compatibility with LT1374CS8-5 and LT1374CFE-5 regulator ICs used on the board.

Technical Context

The DC188A-A implements a current-mode, constant-frequency buck topology using the LT1374-5 IC, which integrates a 4.5A NPN power switch, oscillator, error amplifier, and slope compensation circuitry. Its design leverages BOOST pin drive to saturate the internal switch (R_DS(on) ≈ 0.07Ω), enabling >89% peak efficiency at 10V_IN/5V_OUT/4.25A.

Board-level features include a 5µH power inductor, MBRS330T3 Schottky catch diode, solid tantalum and ceramic output capacitors, and dedicated test points for VIN, VOUT, VSW, and VC. The layout incorporates thermal relief for the exposed-pad TSSOP package and optimized high-dI/dt paths to minimize EMI and voltage spikes on VIN and VSW.

Key Specifications

Availability

DC188A-A is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power subsystems requiring stable component supply, rapid prototyping support, and production-ready reference designs.

Supply support for DC188A-A 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

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The DC188A-A belongs to Linear Technology's DC/DC Demonstration Board family, engineered to accelerate validation of monolithic switching regulators in real-world thermal, noise, and transient conditions.

FAQ

What is the DC188A-A used for?

The DC188A-A is a fully assembled demonstration board for the LT1374-5 buck regulator. It provides a turnkey platform to evaluate 5V/4.25A power conversion performance, validate thermal behavior under load, and verify PCB layout techniques for high-current switching regulators. Engineers use DC188A-A to confirm startup sequencing, transient response, and efficiency before committing to custom designs.

Does the DC188A-A support adjustable output voltages?

No. The DC188A-A is configured exclusively for fixed 5V output using the LT1374-5 IC variant, which replaces the FB pin with a SENSE pin tied directly to VOUT. To evaluate adjustable outputs, users must select a different demo board such as DC188A-B (for LT1374 adjustable versions) or modify the DC188A-A by replacing the LT1374-5 with an LT1374CS8 and adding an external resistor divider - not recommended without redesign verification.

What input voltage range is validated for the DC188A-A?

The DC188A-A is characterized and guaranteed for operation from 6V to 25V input, matching the absolute maximum rating of the LT1374-5 IC. Testing confirms stable 5V regulation and thermal compliance across this range at loads up to 4.25A, with peak efficiency observed at 10V_IN. Operation below 6V may fail to sustain regulation due to minimum boost voltage requirements (≥2.3V across BOOST capacitor).

Can the DC188A-A be synchronized to an external clock?

Yes. The DC188A-A exposes the SYNC pin of the LT1374-5 IC via a test point and onboard 10kΩ pull-up resistor. It accepts logic-level signals (10–90% duty cycle) from 580kHz to 1MHz, allowing precise timing alignment with system clocks or other converters. When synchronized, the board maintains tight duty-cycle control and reduces beat-frequency noise - critical for noise-sensitive applications like audio or precision sensing.

Is thermal management provided on the DC188A-A?

Yes. The DC188A-A uses the LT1374CFE-5 in a 16-pin TSSOP package with exposed thermal pad soldered directly to a 0.5 in² internal ground plane. Measured θ_JA is 30°C/W under standard JEDEC conditions, enabling full 4.25A output with junction temperature held below 125°C at ambient 70°C. Thermal vias beneath the IC pad and thick copper pours on both layers ensure reliable conduction cooling without heatsinks.