Analog Devices Inc./Maxim Integrated MAX20458EVKIT#

Overview

MAX20458EVKIT# from Maxim Integrated is a fully assembled and tested evaluation kit for the MAX20458 36V synchronous buck converter and asynchronous boost controller in 28-pin side-wettable TQFN. It supports input voltages from 3.5V to 40V (down to 2V with pre-boost), delivers up to 3.5A at 3.3V/5V on the buck output, and includes jumpers for EN1/EN2 control, FSYNC mode selection, PGOOD1 monitoring, and EXTVCC configuration.

For engineers reviewing the MAX20458EVKIT# datasheet, MAX20458EVKIT# pinout, MAX20458EVKIT# application, or MAX20458EVKIT# equivalent, this kit enables rapid validation of MAX20458 variants-including 400kHz/2.1MHz switching frequencies, adjustable buck outputs (1V–10V), fixed/adjustable boost outputs (10V nominal), and automotive-grade operation across –40°C to +125°C.

Technical Context

The MAX20458EVKIT# implements a proven PCB layout optimized for the MAX20458's dual-regulator architecture: one synchronous buck channel (OUT1) with ±2% output voltage accuracy and PGOOD1 monitoring, and one asynchronous boost channel (OUT2) with 10V fixed or resistor-programmable output. All passive components-including 2.2µH L1, 0.47µH L3, and 47µF C7/C8-are rated for automotive temperature range.

It supports forced-PWM or skip-mode operation via the FSYNC pin (default jumpered high), enables VCC sourcing from internal LDO or external EXTVCC (jumper-selectable), and provides test points at critical nodes-VBATTF, VOUT1, VOUT2, LX1, LX2, PGOOD1, EN1, EN2, and FSYNC-for real-time waveform capture and regulation verification.

Key Specifications

Availability

MAX20458EVKIT# is available at Aetrix Electronics and suitable for automotive power system validation, industrial DC-DC design prototyping, and embedded power supply qualification requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for MAX20458EVKIT# 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 automotive, industrial, and communications systems.

The MAX20458 product line targets high-reliability automotive power conversion-specifically dual-output DC-DC solutions for ADAS, infotainment, and body electronics where input transients up to 40V and wide temperature operation are mandatory.

FAQ

What is the default IC installed on the MAX20458EVKIT#?

The MAX20458EVKIT# ships with the MAX20458ATIA/VY+ variant installed-a 3.3V/ADJ buck output, 2.1MHz switching frequency version in 28-pin TQFN. This variant supports 10V fixed boost output and operates across –40°C to +125°C. The board layout and component selection are optimized for this variant, though other MAX20458 options can be evaluated with minor changes as documented in the user guide.

Can the MAX20458EVKIT# evaluate both buck and boost functions simultaneously?

Yes, the MAX20458EVKIT# supports concurrent operation of its buck (OUT1) and boost (OUT2) channels. Default jumper settings (JU3_EN1 and JU1_EN2 both shunted) enable both controllers. VOUT1 delivers regulated 3.3V at up to 3.5A, while VOUT2 provides 10V boost output using external diode D3 and inductor L4. Independent enable inputs and separate feedback networks allow independent control and tuning of each regulator.

How do I configure the MAX20458EVKIT# for forced-PWM versus skip mode?

Configure the MAX20458EVKIT# for forced-PWM by installing the shunt on JU4_FSYNC (pins 1–2), pulling FSYNC high to VBIAS-this forces PWM operation across all loads. For skip mode, remove the shunt to leave FSYNC floating or pull it low externally; the IC then automatically switches between skip (light load) and PWM (heavy load) based on output current demand. Mode selection directly impacts light-load efficiency and output ripple.

What is the purpose of the JU5_EXTVCC jumper on the MAX20458EVKIT#?

The JU5_EXTVCC jumper on the MAX20458EVKIT# selects the VCC supply source for the MAX20458 IC. With the shunt at pins 2–3, EXTVCC connects to GND, forcing the internal LDO to supply BIAS. To improve efficiency, move the shunt to pins 1–2 to connect EXTVCC to VOUT1-bypassing the LDO and using the buck output to power the IC's bias rail. This reduces power loss and thermal stress during high-current operation.

Does the MAX20458EVKIT# include test points for critical signals like PGOOD1 and FSYNC?

Yes, the MAX20458EVKIT# includes dedicated test points for key control and monitoring signals: TP_PGOOD1 monitors the buck output regulation status (open-drain, pulled up via JU_PGOOD1), TP_FSYNC allows external clock injection or logic-level control of switching mode, TP_EN1 and TP_EN2 provide access to independent enable inputs, and TP_BIAS enables verification of the bias rail voltage. These test points are labeled and accessible on the top silkscreen for oscilloscope probing and multimeter measurement.