Analog Devices Inc./Maxim Integrated MAX774EVKIT

Overview

MAX774EVKIT from Maxim Integrated is an evaluation kit for the MAX774 high-efficiency, low-quiescent-current inverting DC-DC controller IC. It supports fixed -5V output or user-adjustable negative output voltages using external feedback resistors, operates from 3V to 16.5V input, delivers up to 1A load current, and enables rapid validation of bootstrapped/nonbootstrapped topologies in LCD bias and portable power applications.

For engineers reviewing the MAX774EVKIT datasheet, MAX774EVKIT pinout, MAX774EVKIT application, or MAX774EVKIT equivalent, this kit provides verified reference design implementation, real-world efficiency measurement capability (85% at 5mA–1A), adjustable output configuration, and direct access to EXT gate-drive waveform analysis - critical for P-channel MOSFET selection and transient response tuning in space-constrained battery-powered systems.

Technical Context

The MAX774EVKIT implements the MAX774 controller in a fully assembled, tested PCB layout with Si9435 P-channel MOSFET, 22µH shielded inductor, Schottky rectifier (1N5822/MBR340), and optimized input/output capacitors. It supports both bootstrapped (EXT driven from V+ to VOUT) and nonbootstrapped (EXT driven from V+ to GND) configurations, enabling evaluation across wide VIN–VOUT differentials while respecting the 21V V+–VOUT absolute maximum rating.

It exposes all key control and monitoring nodes - including SHDN, FB, REF, CS, and EXT - allowing direct oscilloscope probing of gate drive timing (tON(max) = 16µs, tOFF(min) = 2.3µs), current-limit threshold (210mV), and reference stability (1.5V ±30mV). The board includes test points for load-transient (100µs/div) and line-transient (2ms/div) characterization per Figure 2 and Figure 4 of the MAX774 datasheet.

Key Specifications

Availability

MAX774EVKIT is available at Aetrix Electronics and suitable for LCD bias generation, portable medical instrumentation, and industrial handheld terminals requiring stable component supply and fast time-to-test validation of inverting power architectures.

Supply support for MAX774EVKIT 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 solutions for industrial, automotive, and communications markets.

The MAX774EVKIT belongs to Maxim's evaluation platform family for high-efficiency inverting controllers, designed specifically to accelerate development of ultra-low-IQ negative voltage rails in battery-critical applications where >85% efficiency across 5mA–1A load range is mandatory.

FAQ

What is the primary function of the MAX774EVKIT?

The MAX774EVKIT is a fully assembled evaluation kit for the MAX774 inverting DC-DC controller IC. It enables engineers to validate circuit performance, measure efficiency, characterize transient response, and select optimal external components - including P-channel MOSFETs, inductors, and feedback networks - before committing to custom PCB design. The MAX774EVKIT directly implements the bootstrapped topology shown in Figure 2 of the MAX774 datasheet.

Does the MAX774EVKIT support adjustable output voltages?

Yes, the MAX774EVKIT supports both fixed -5V output (via internal resistor divider) and user-adjustable negative output voltages. This is achieved by replacing the factory-installed feedback network with external R1/R2 resistors connected between VOUT, FB, and REF - exactly as described in the "Adjustable Output" section of the MAX774 datasheet. The board includes solder pads and test points to facilitate this reconfiguration without modification to the core layout.

Can the MAX774EVKIT be used to evaluate nonbootstrapped operation?

Yes, the MAX774EVKIT supports nonbootstrapped operation per Figure 4 of the MAX774 datasheet. This requires relocating the OUT jumper from VOUT to GND and adjusting the feedback network accordingly. The board's silkscreen and documentation explicitly identify the required jumpers and test points for both bootstrapped and nonbootstrapped modes, ensuring safe evaluation within the 21V V+–VOUT absolute maximum rating limit.

What external components are included on the MAX774EVKIT?

The MAX774EVKIT includes a Si9435 P-channel MOSFET, 22µH shielded surface-mount inductor, 1N5822/MBR340 Schottky rectifier, 150µF input capacitor, 0.1µF REF bypass, and output capacitors sized per MAX774 recommendations (330µF/10V for MAX774). All components match those specified in the Typical Operating Circuit (Figure 2) and have been selected for low ESR, thermal stability, and high-frequency performance.

How is efficiency measured using the MAX774EVKIT?

Efficiency is measured on the MAX774EVKIT using standard bench setup: input voltage and load current are applied via Kelvin connections, while input/output power is calculated from simultaneous voltage and current readings at dedicated test points. The board's layout minimizes parasitic losses, and its documented test procedure aligns with Figure 1a–1g in the MAX774 datasheet - confirming 85% efficiency across 5mA–1A loads at -5V output with VIN = 5V, 3V, and 15V.