Analog Devices Inc./Maxim Integrated MAX1724EVKIT+

Overview

MAX1724EVKIT+ from Maxim Integrated is a fully assembled and tested evaluation kit for boost switching regulators, featuring two independent surface-mount circuits: a left-side MAX1724-based 3.3V fixed-output stage and a right-side MAX1722-based adjustable 3.6V output stage. It supports input voltages from 0.91V to VOUT, delivers up to 100mA from 2-cell alkaline/NiMH sources, and operates with 1.5µA quiescent current and up to 90% efficiency via synchronous rectification.

For engineers reviewing the MAX1724EVKIT+ datasheet, MAX1724EVKIT+ pinout, MAX1724EVKIT+ application, or MAX1724EVKIT+ equivalent, this board enables rapid validation of low-voltage startup (0.91V), shutdown mode behavior (0.1µA typ), output voltage adjustability (2.0V–5.5V), and component-level performance of MAX1722/MAX1723/MAX1724 DC-DC converters in battery-powered portable designs.

Technical Context

The MAX1724EVKIT+ implements two discrete boost regulator topologies on a single PCB: the left-side circuit uses the MAX1724 (THIN SOT23-5) with factory-set 3.3V output and SHDN-controlled 0.1µA shutdown mode; the right-side circuit hosts the MAX1722 (also THIN SOT23-5) with feedback-resistor-adjustable output (default 3.6V), BATT-pin-assisted low-voltage startup, and compatibility with MAX1723 evaluation via component swap.

Both circuits operate from 0.91V input, support 200kHz switching frequency, use external 10µH inductors and 10µF ceramic output capacitors, and rely on jumper-configurable SHDN/BATT connections (JU1 for MAX1724, JU2 for MAX1722/MAX1723) - enabling direct verification of startup threshold, load regulation, and quiescent current under real-world battery conditions.

Key Specifications

Availability

MAX1724EVKIT+ is available at Aetrix Electronics and suitable for battery-powered portable electronics, low-voltage sensor nodes, and energy-harvesting subsystems requiring stable component supply and validated reference design validation.

Supply support for MAX1724EVKIT+ 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, automotive, communications, and consumer applications.

The MAX1724EVKIT+ belongs to Maxim's battery-optimized DC-DC evaluation platform family, designed specifically to accelerate development of ultra-low-voltage boost converters for 1- and 2-cell primary/secondary battery systems.

FAQ

What devices does the MAX1724EVKIT+ evaluate?

The MAX1724EVKIT+ evaluates three related boost converter ICs: the MAX1724 (3.3V fixed output, left-side circuit), the MAX1722 (adjustable output, right-side circuit, default 3.6V), and the MAX1723 (SHDN-enabled variant of MAX1722, evaluated by swapping U2). All share the same THIN SOT23-5 package and core architecture, and the MAX1724EVKIT+ provides dedicated jumpers (JU1, JU2) and layout provisions to validate each device's specific features including shutdown mode and BATT-pin functionality.

How do I configure the MAX1724EVKIT+ for MAX1724 evaluation?

To evaluate the MAX1724 on the left side of the MAX1724EVKIT+, install a shunt across pins 1 and 2 of jumper JU1 to enable the device, connect 0.91V–3.3V to VBATT and GND, then measure 3.3V at VOUT. The MAX1724EVKIT+ ships with this configuration pre-set. For shutdown testing, move the shunt to pins 2–3 of JU1, which grounds SHDN and reduces quiescent current to 0.1µA typical while pulling VOUT to VBATT minus diode drop.

Can the right-side circuit of the MAX1724EVKIT+ be used for other output voltages?

Yes - the right-side circuit of the MAX1724EVKIT+ supports output voltages from 2.0V to 5.5V by replacing feedback resistors R1 (2.00MΩ) and R2 (1.02MΩ) with values calculated per the MAX1722/MAX1723/MAX1724 datasheet's output voltage equation. The MAX1724EVKIT+ schematic and component placement accommodate standard 0805 resistors, and the board includes pads for optional D1 (low-VF Schottky) when extending operation below 0.91V input.

What is the role of the BATT pin on the MAX1724EVKIT+ right-side circuit?

The BATT pin on the MAX1724EVKIT+ right-side circuit connects to the MAX1722/MAX1723's BATT terminal, lowering the guaranteed startup voltage from 1.2V to 0.91V. On the MAX1724EVKIT+, jumper JU2 configures this connection: a shunt across pins 1–2 links BATT to VBATT, enabling low-voltage operation. This feature is critical for evaluating true end-of-discharge behavior in 1-cell alkaline or NiMH systems, and is verified during functional test of the MAX1724EVKIT+.

Does the MAX1724EVKIT+ include all necessary passive components?

Yes - the MAX1724EVKIT+ is fully assembled and tested with all required passives: four 10µF/16V X7R ceramic capacitors (C1–C4), two 10µH shielded inductors (L1, L2), and precision feedback resistors (R1 = 2.00MΩ, R2 = 1.02MΩ). No additional components are needed to operate either circuit at their default outputs (3.3V and 3.6V); only a DC input source, ground connection, and voltmeter are required for basic validation of the MAX1724EVKIT+.