Analog Devices Inc./Maxim Integrated MAX5026EVKIT

Overview

MAX5026EVKIT from Maxim Integrated is an evaluation kit for the MAX5026 adjustable 500kHz, 36V-output boost DC-DC converter in SOT23-6 package, designed to generate low-noise 30V bias for varactor diodes in TV tuners and set-top boxes using a 3V–11V input supply and external feedback resistors.

For engineers reviewing the MAX5026EVKIT datasheet, MAX5026EVKIT pinout, MAX5026EVKIT application, or MAX5026EVKIT equivalent, this kit enables rapid validation of MAX5026-based 30V boost designs with RC-filtered output ripple down to 1mV_p-p, efficiency up to 90% at 4mA load, and startup capability down to 3V input voltage.

Technical Context

The MAX5026EVKIT implements a constant-frequency, current-mode PWM boost topology centered on the MAX5026 IC, featuring a 40V lateral DMOS internal switch, 1.25V FB reference, and discontinuous conduction mode operation to minimize output voltage spikes. It supports user-adjustable output via external R1/R2 divider (e.g., 147kΩ/6.34kΩ for 30V) and includes an optional RC filter (100Ω + 1µF) to suppress switching noise.

Designed for low-noise analog biasing, the kit integrates layout-optimized grounding-separate PGND and GND pins tied at a star point-and minimizes trace area at LX and FB to reduce EMI and feedback error. The 47µH shielded drum inductor (Toko A915BY-470M) and Zetex ZHCS500 Schottky diode are pre-selected per Maxim's design guidelines for 500kHz operation.

Key Specifications

Availability

MAX5026EVKIT is available at Aetrix Electronics and suitable for TV tuner development, set-top box power supply validation, and PCI cable modem biasing requiring stable component supply and rapid prototyping support.

Supply support for MAX5026EVKIT 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX5026EVKIT belongs to Maxim's precision DC-DC evaluation platform family, engineered to accelerate design-in of low-noise, high-voltage bias supplies for RF tuning and display applications.

FAQ

What is the primary function of the MAX5026EVKIT?

The MAX5026EVKIT is an evaluation kit that demonstrates and validates the MAX5026 adjustable boost converter IC. It provides a fully assembled, tested circuit generating a low-noise 30V output from a 3V–11V input, optimized for varactor diode biasing in TV tuners and set-top boxes. The MAX5026EVKIT includes all critical components-inductor, Schottky diode, feedback resistors, and optional RC filter-as specified in Maxim's application circuits.

Does the MAX5026EVKIT support adjustable output voltages?

Yes, the MAX5026EVKIT is configured for 30V output using a 147kΩ/6.34kΩ resistor divider per Figure 2 and Figure 3 of the MAX5025–MAX5028 datasheet, but it supports user-defined outputs by replacing R1 and R2. The MAX5026 IC itself has a 1.25V FB reference, enabling output adjustment from V_CC up to 36V using the formula V_OUT = 1.25 × (1 + R1/R2), as validated in the MAX5026EVKIT's design documentation.

What components are included on the MAX5026EVKIT board?

MAX5026EVKIT includes the MAX5026 IC in SOT23-6, Toko A915BY-470M 47µH shielded inductor, Zetex ZHCS500 Schottky diode, 4.7µF input ceramic capacitor (C1), 1µF output ceramic capacitor (C2), optional 100Ω/1µF RC filter (R3/C3), and precision feedback resistors (R1 = 147kΩ, R2 = 6.34kΩ). All parts match Maxim's recommended bill-of-materials for low-noise 30V boost operation.

Can the MAX5026EVKIT be used to evaluate noise performance?

Yes-the MAX5026EVKIT explicitly supports noise characterization via dual configurations: one without RC filtering (Figure 2) and one with a 100Ω + 1µF RC filter (Figure 3), which reduces output ripple to ≤1mV_p-p. Oscilloscope waveforms in the MAX5025–MAX5028 datasheet (toc12–toc17) were captured directly from the MAX5026EVKIT, confirming its utility for measuring light-load switching noise, line/load transients, and EMI-sensitive applications like tuner biasing.

Is the MAX5026EVKIT compatible with other devices in the MAX5025–MAX5028 family?

The MAX5026EVKIT is specifically tailored for the MAX5026, but its PCB layout and component selection align closely with the entire MAX5025–MAX5028 family due to identical SOT23-6 pinout and shared functional architecture. While MAX5025/MAX5027 require different input voltage ranges (4.5V–11V) and MAX5027/MAX5028 use internal feedback for fixed 30V, the MAX5026EVKIT's test points and jumper options allow comparative evaluation of regulation accuracy, efficiency, and thermal behavior across variants when substituted.