Analog Devices Inc./Maxim Integrated MAX1797EVKIT

Overview

MAX1797EVKIT from Maxim Integrated is an evaluation kit for the MAX1797 high-efficiency, 1A current-limit step-up DC-DC converter in 8-pin μMAX package. It enables rapid validation of 3.3V/5V output configurations, True Shutdown™ operation, and battery-monitoring comparator functionality in ultra-low-power portable systems. The kit supports input voltages from +0.7V to +5.5V and delivers up to 550mA at 3.3V or 370mA at 5.0V from a 2V input.

For engineers reviewing the MAX1797EVKIT datasheet, MAX1797EVKIT pinout, MAX1797EVKIT application, or MAX1797EVKIT equivalent, this kit provides verified reference design implementation of the MAX1797 IC-including LX-damping circuitry for EMI reduction, LBI/LBO comparator integration in shutdown mode, and adjustable output voltage via external resistor divider-enabling accurate system-level power architecture validation before production.

Technical Context

The MAX1797EVKIT implements the MAX1797 IC's minimum-off-time, current-limited control scheme that combines PWM efficiency with pulse-skipping quiescent current (25μA typical). It validates the device's synchronous rectification architecture-eliminating external Schottky diodes-and demonstrates the proprietary LX-damping switch (100–400Ω on-resistance) that suppresses ringing without affecting output ripple.

This kit confirms real-world behavior of key integrated functions: True Shutdown™ disconnects OUT from BATT while maintaining LBI/LBO activity (<2μA shutdown current); the dual-mode FB pin selects preset 3.3V (FB→OUT) or 5.0V (FB→GND) outputs or enables 2.0–5.5V adjustment; and the 0.85V LBI threshold remains active across -40°C to +85°C.

Key Specifications

Availability

MAX1797EVKIT is available at Aetrix Electronics and suitable for portable digital audio players, wireless handsets, PDAs/palmtops, and portable terminals requiring stable component supply and validated power-conversion reference designs.

Supply support for MAX1797EVKIT 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 portable, industrial, and communications applications.

The MAX1797EVKIT belongs to Maxim's low-supply-current DC-DC converter product line, designed specifically for space-constrained, battery-powered handheld devices needing high efficiency (>95%), ultra-low quiescent current, and integrated battery monitoring.

FAQ

What is the primary function of the MAX1797EVKIT?

The MAX1797EVKIT is an evaluation kit for the MAX1797 step-up DC-DC converter IC. It provides a fully assembled, tested PCB with all necessary passive components-including 22µH inductor, 47µF input/output capacitors, and feedback/resistor network-to validate the MAX1797's performance in real-world conditions. Engineers use it to verify startup from 0.85V, efficiency curves, True Shutdown™ behavior, LBI/LBO comparator response, and adjustable output voltage configuration before integrating the MAX1797 into their own designs.

Does the MAX1797EVKIT support both 3.3V and 5.0V output configurations?

Yes, the MAX1797EVKIT supports both preset output voltages. By strapping the FB pin to OUT, the MAX1797 delivers 3.3V; by strapping FB to GND, it delivers 5.0V. The kit includes solder jumpers or test points to easily configure either mode. Additionally, the board allows replacement of the feedback resistors to implement custom output voltages between 2.0V and 5.5V using the formula R1 = R2 × ((VOUT / 1.245V) − 1).

How does the MAX1797EVKIT demonstrate True Shutdown™ functionality?

The MAX1797EVKIT validates True Shutdown™ by showing complete disconnection of the output (OUT) from the input (BATT) when SHDN is asserted high: OUT enters high-impedance state, supply current drops below 2μA, and no DC path remains. Crucially, the kit confirms that the LBI/LBO comparator remains fully operational during shutdown-enabling autonomous low-battery detection and system-level shutdown sequencing without waking the main controller. This eliminates need for external MOSFETs or diodes in battery-sensitive designs.

Can the MAX1797EVKIT be used to evaluate EMI reduction features?

Yes, the MAX1797EVKIT directly implements Maxim's proprietary LX-damping circuitry. It includes the internal damping switch (100–400Ω) connected between BATT and LX, which activates when inductor energy depletes to suppress ringing. Users can compare oscilloscope waveforms at the LX node-with and without damping enabled-to quantify EMI reduction. The kit's layout follows best practices (short LX/GND traces, ground plane) to isolate this effect and confirm >95% efficiency is maintained without compromising noise performance.

What are the key design validations enabled by the MAX1797EVKIT for portable applications?

The MAX1797EVKIT enables validation of five critical portable-design requirements: (1) startup from weak batteries (0.85V min), (2) sustained operation down to 0.7V input, (3) <25μA quiescent current under light load, (4) seamless transition into & out of True Shutdown™ with LBI/LBO active, and (5) stable 3.3V/5.0V output under dynamic load transients (0–325mA). These are measured using the onboard test points and documented in Maxim's typical operating characteristics graphs included with the MAX1797EVKIT user guide.