Analog Devices Inc./Maxim Integrated MAX77505QEVKIT#

Overview

MAX77505QEVKIT# from Analog Devices is a fully assembled and tested evaluation kit designed to demonstrate the MAX77505 hysteretic step-down (buck) converter. It supports 2.5V–16V input, delivers up to 3A continuous load, and enables adjustable output voltage from 0.8V to 5.5V via RSEL resistor or onboard potentiometer-used for power validation in portable industrial sensors and battery-powered edge nodes.

For engineers reviewing the MAX77505QEVKIT# datasheet, MAX77505QEVKIT# pinout, MAX77505QEVKIT# application, or MAX77505QEVKIT# equivalent, this kit provides verified reference layout, jumper-configurable EN/SEL/POK control, on-board sense terminals for precision efficiency measurement, and critical node probe points (LX1, OUT1) for ripple and transient analysis under real load conditions.

Technical Context

The MAX77505QEVKIT# implements the MAX77505AEFB+ IC in a fixed 3.3V default configuration (J3 at 1–2), with hardware-selectable enable (J1), POK pullup (J2), and SEL voltage programming. It integrates 1.5µH power inductor, dual 10µF X7S output capacitors, 4.7µF input bulk caps, and 0.22µF BST capacitor-all optimized for low-I_Q (800µA typ) operation across –40°C to +125°C junction temperature.

Test points include INS/PGNDS for input voltage sensing, OUTS/PGND1S for output voltage sensing, SIG_P/SIG_N across R3 (replaceable with 1Ω) for Bode plot injection, and LX1/OUT1 socketed probe points with pig-tail ground path to minimize switching noise coupling during waveform capture.

Key Specifications

Availability

MAX77505QEVKIT# is available at Aetrix Electronics and suitable for power validation, DC-DC reference design verification, and efficiency benchmarking in portable instrumentation, battery management subsystems, and low-power IoT edge devices requiring stable component supply and rapid prototyping support.

Supply support for MAX77505QEVKIT# 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

Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement, power management, and signal integrity applications.

The MAX77505QEVKIT# belongs to Analog Devices' power management evaluation platform family, engineered to accelerate development of ultra-low-quiescent-current DC-DC solutions for space-constrained, battery-critical applications such as wearables and remote sensors.

FAQ

What is the default output voltage configured on the MAX77505QEVKIT#?

The MAX77505QEVKIT# ships with jumper J3 in position 1–2, connecting the SEL pin to a 0Ω resistor to set the default output voltage to 3.3V. This configuration matches the typical application circuit in the MAX77505 datasheet and is verified across input range (2.5V–16V) and load (0–3A). The MAX77505QEVKIT# can be reconfigured to any output between 0.8V and 5.5V using the onboard potentiometer or external RSEL resistor.

How do I measure efficiency accurately using the MAX77505QEVKIT#?

To measure efficiency accurately with the MAX77505QEVKIT#, use the dedicated sense terminals: INS and PGNDS for input voltage, OUTS and PGND1S for output voltage. Connect the DC power supply and electronic load to the main IN/PGND and OUT/PGND terminals-not the sense pins-to avoid damage or measurement error. Set multimeters to 100 NPLC integration time, ensure short/thick load wires, and verify output settles before recording VI readings. The MAX77505QEVKIT#'s layout minimizes parasitic resistance for repeatable results.

Can the MAX77505QEVKIT# operate at full 3A load across its entire input voltage range?

Yes, the MAX77505QEVKIT# is rated for 3A continuous output across the full 2.5V–16V input range, validated with its Sumida 1.5µH/4.9A inductor, dual 10µF X7S output capacitors, and thermal layout per MAX77505AEFB+ FC2QFN package specifications. At low input voltages (e.g., 2.5V), ensure adequate airflow or heatsinking to maintain junction temperature ≤+125°C, as power dissipation increases at high duty cycles.

What is the purpose of the SIG_P and SIG_N test points on the MAX77505QEVKIT#?

SIG_P and SIG_N are differential test points placed across 0Ω resistor R3 between the MAX77505QEVKIT# output and feedback sense node (OUTS). They enable Bode plot measurement when R3 is replaced with a 1Ω resistor and an AC disturbance is injected. This allows loop stability analysis using instruments like the Bode100. The MAX77505QEVKIT# schematic and layout preserve signal integrity for accurate phase/gain margin assessment without modifying the core power stage.

Does the MAX77505QEVKIT# support high-temperature operation up to +125°C?

The MAX77505QEVKIT# incorporates the MAX77505AEFB+, which is rated for +125°C junction temperature, but not all passive components share this rating. Specifically, C4 (100µF tantalum) is not rated for +125°C and may exhibit increased leakage. For sustained high-temperature testing, verify or replace temperature-sensitive parts (e.g., C4, certain ceramics) per the MAX77505QEVKIT# Bill of Materials. The MAX77505QEVKIT# PCB itself supports thermal profiling up to +125°C ambient with appropriate derating.