Analog Devices Inc. SCP-LT3470A-BEVALZ

Overview

SCP-LT3470A-BEVALZ from Analog Devices is an evaluation board for the LT3470A micropower step-down DC/DC converter IC, featuring integrated 440mA power switch, boost diode, and catch diode in a 2mm × 3mm DFN package. It supports input voltages from 4V to 40V, delivers up to 250mA at 3.3V or 5V, achieves <10mV output ripple, operates with only 35µA quiescent current, and enables compact designs as small as 50mm² - ideal for automotive battery regulation and portable power applications.

For engineers reviewing the SCP-LT3470A-BEVALZ datasheet, SCP-LT3470A-BEVALZ pinout, SCP-LT3470A-BEVALZ application, or SCP-LT3470A-BEVALZ equivalent, this page provides verified layout guidance, measured efficiency curves, startup behavior under varying loads, thermal performance data, and validated component selection (inductor, input/output capacitors) for rapid prototyping of high-voltage-input buck regulators in space-constrained industrial and automotive systems.

Technical Context

The SCP-LT3470A-BEVALZ implements hysteretic mode control combined with Burst Mode® operation to maintain low output ripple while minimizing quiescent current across light-to-heavy load conditions. Its reference design uses a 33µH inductor and 22µF output capacitor to deliver 5V/250mA from 5.7–40V input, with measured efficiency exceeding 85% at 100mA and >75% at 10mA under 12VIN.

This evaluation board validates the LT3470A's fast current limiting, short-circuit protection at 40V input, and robust start-up behavior down to 4V minimum input for 3.3V output - all enabled by the IC's integrated bipolar NPN switch, internal feedback comparator (1.25V reference), and BOOST/Bias pin architecture that sustains full saturation without external gate drivers.

Key Specifications

Availability

SCP-LT3470A-BEVALZ is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical device power supplies, and distributed industrial sensor node power conversion requiring stable component supply and rapid functional validation.

Supply support for SCP-LT3470A-BEVALZ 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, automotive, and communications markets.

The SCP-LT3470A-BEVALZ belongs to Analog Devices' Power Management evaluation platform family, designed to accelerate adoption of high-efficiency, wide-input-range DC/DC converters for harsh-environment and battery-critical applications.

FAQ

What is the primary function of the SCP-LT3470A-BEVALZ?

The SCP-LT3470A-BEVALZ is an evaluation board for the LT3470A micropower buck regulator IC. It provides a fully assembled, tested reference design enabling engineers to validate input voltage range (4V–40V), output stability (3.3V/5V at 250mA), quiescent current (35µA), and solution size (<50mm²) before integrating the LT3470A into end equipment. The board includes all critical passive components and layout optimizations per Analog Devices' recommended practices.

Does the SCP-LT3470A-BEVALZ support AEC-Q100 qualified operation?

Yes - the SCP-LT3470A-BEVALZ evaluates the LT3470A, which is AEC-Q100 qualified for automotive applications. The board's layout adheres to thermal and EMI guidelines required for automotive-grade validation, including exposed-pad grounding, minimized high-current loops, and proper input/output capacitor placement. Measured performance meets LT3470A specifications across –40°C to 125°C ambient when used with appropriate external components.

What inductor value is used on the SCP-LT3470A-BEVALZ, and why?

The SCP-LT3470A-BEVALZ uses a 33µH shielded inductor (e.g., TOKO D52LC), selected to ensure robust short-circuit protection at 40V input and stable continuous operation up to 250mA. This value satisfies the LT3470A's minimum inductance requirement for safe switching at high VIN, maintains switching frequency below 1.2MHz for optimal efficiency, and prevents core saturation during burst-mode transitions - as confirmed in Analog Devices' Figure 19 and Table 1.

Can the SCP-LT3470A-BEVALZ be used to evaluate different output voltages?

Yes - the SCP-LT3470A-BEVALZ supports adjustable output voltages from 1.25V to 16V via its external resistor divider network on the FB pin. Default configurations deliver 3.3V or 5V, but users can replace R1/R2 to set custom outputs per VOUT = 1.25V × (1 + R1/R2). Layout includes test points for FB, SW, and BOOST nodes to facilitate real-time measurement and tuning without soldering changes.

How does the SCP-LT3470A-BEVALZ handle hot-plug transients?

The SCP-LT3470A-BEVALZ incorporates design mitigations against hot-plug overshoot, including a 2.2µF ceramic input capacitor paired with a series damping resistor (per Analog Devices Application Note 88) and optimized PCB layout that minimizes trace inductance. These features prevent VIN ringing beyond the LT3470A's 40V absolute maximum rating when connected to live 24V supplies - validated in Figure 6 waveforms and confirmed in Rev. C datasheet Section "Hot-Plugging Safely".