Analog Devices Inc./Maxim Integrated MAX1605EVKIT

Overview

The MAX1605EVKIT from Maxim Integrated is a fully assembled and tested evaluation kit for the MAX1605 boost switching converter IC, configured to generate +18V at up to 30mA for driving low-power LCD displays. It operates from input voltages as low as +0.8V (battery) and +2.4V–+5.5V (IC V_CC), supports 500kHz switching, and features jumper-selectable shutdown mode and inductor current limits (125/250/500mA).

For engineers reviewing the MAX1605EVKIT datasheet, MAX1605EVKIT pinout, MAX1605EVKIT application, or MAX1605EVKIT equivalent, this board enables rapid validation of boost converter performance, output voltage adjustment via feedback resistors, efficiency testing up to 88%, low-quiescent-current operation (1µA shutdown), and single- or dual-supply configuration with verified component layout.

Technical Context

The MAX1605EVKIT implements a fixed-frequency, current-mode boost topology using the MAX1605EUT SOT23-6 IC with integrated MOSFET switches. It accepts ultra-low input voltages down to +0.8V while delivering regulated +18V output, leveraging external components including a 10µH inductor (Sumida CR32-100), Schottky diode (Nihon EP05Q03L), and ceramic capacitors (C1–C3).

Jumper JU1 controls SHDN pin logic (VIN-enabled or GND-shutdown), and JU2 selects LIM pin bias to set inductor peak current at 125mA, 250mA, or 500mA. Output voltage is set by R1 (2.2MΩ) and R2 (165kΩ) to yield V_OUT = 1.25V × (R1/R2 + 1) = +18V, and is adjustable across +0.8V to +30V via resistor reselection.

Key Specifications

Availability

MAX1605EVKIT is available at Aetrix Electronics and suitable for LCD bias supply validation, portable medical display power design, handheld instrument battery-life optimization, and low-voltage boost converter reference implementation requiring stable component supply and documented test conditions.

Supply support for MAX1605EVKIT 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.

The MAX1605 product line delivers ultra-low-input-voltage boost converters for battery-powered LCD bias and sensor interface applications, emphasizing high efficiency, minimal quiescent current, and small-footprint integration.

FAQ

What is the primary function of the MAX1605EVKIT?

The MAX1605EVKIT is an evaluation platform for the MAX1605 boost converter IC. It provides a ready-to-test circuit that generates +18V at up to 30mA from inputs as low as +0.8V, specifically targeting low-power LCD display bias applications. The MAX1605EVKIT includes all necessary passive components, jumpers for configuration, and verified layout per Maxim's reference design.

Can the MAX1605EVKIT operate from a single power supply?

Yes, the MAX1605EVKIT supports single-supply operation. To enable this, connect a jumper wire between the VIN and VCC pads, then apply a +2.4V to +5.5V supply to either pad. This configuration powers both the converter input and the MAX1605 IC's V_CC pin simultaneously, eliminating the need for separate supplies - a key capability validated on the MAX1605EVKIT board.

How do I adjust the output voltage on the MAX1605EVKIT?

The MAX1605EVKIT's output voltage is set by feedback resistors R1 (2.2MΩ) and R2 (165kΩ), yielding +18V per V_OUT = 1.25V × (R1/R2 + 1). To change V_OUT, replace R1 and/or R2 with values calculated using that equation. Capacitor C3 must be rated above the new V_OUT. Instructions for resistor selection are provided in the MAX1605 data sheet referenced in the MAX1605EVKIT documentation.

What are the jumper configurations on the MAX1605EVKIT used for?

JU1 controls shutdown: shunt pins 1–2 enables the MAX1605; shunt pins 2–3 places it in shutdown (<0.1µA). JU2 sets inductor current limit: pins 1–2 = 500mA, pins 2–3 = 125mA, floating = 250mA. These jumpers allow direct hardware-level evaluation of power-stage behavior without soldering - a core feature of the MAX1605EVKIT's test methodology.

What efficiency and quiescent current performance does the MAX1605EVKIT demonstrate?

The MAX1605EVKIT demonstrates up to 88% conversion efficiency at full load and 18µA typical operating supply current (I_CC). In shutdown mode (JU1 pins 2–3), the MAX1605 draws <0.1µA - critical for battery longevity. These metrics are measured under the board's factory configuration and documented in the MAX1605EVKIT data sheet, confirming real-world performance of the MAX1605 IC in its intended application.