2024年6月7日发(作者：)

MAX38886EVKIT#

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MAX38886 Evaluation Kit

General Description

The MAX38886 evaluation kit (EV kit) evaluates the

MAX38886 IC. The MAX38886 is a super cap backup

regulator designed to transfer power between a super

cap and a system supply rail. When the main battery is

present and above the minimum system supply voltage,

the regulator charges the super cap at up to a 500mA

rate. Once the super cap is charged, the circuit draws only

3μA of current while it maintains the super cap in its ready

state. When the main battery is removed, the regulator

prevents the system from dropping below the minimum

operating voltage, discharging the super cap at up to a

2.5A peak inductor current. Multiple MAX38886 ICs can

be connected in parallel for higher current applications.

The MAX38886 is externally programmable for mini-

mum and maximum super cap voltage, minimum system

voltage, and maximum charge and discharge currents.

The internal DC-DC converter requires only a 1μH induc-

tor and a 22μF capacitor.

Features

● 2.99V to 3.36V System Output Voltage Range

● 0.5V to 2.71V Super Cap Voltage Range

● 2.5A Peak Discharge Current

● Resistor-Adjustable Voltage and Current Thresholds

● Proven 2-Layer, 2oz Copper PCB Layout

● Compact Solution Size

● Fully Assembled and Tested

MAX38886 EV Kit Files

FILEDESCRIPTION

MAX38886 EV BOMEV Kit Bill of Material

MAX38886 EV PCB LayoutEV Kit Layout

MAX38886 EV SchematicEV Kit Schematic

Ordering Information appears at end of data sheet.

319-100532; Rev 0; 5/20

Evaluates: MAX38886

Quick Start

Required Equipment

● MAX38886 EV kit

● 5V, 3A DC power supply

● One digital multimeter (DMM)

Procedure

The EV kit is fully assembled and tested. Use the follow-

ing steps to verify board operation:

Caution: Do not turn on power supply until all con-

nections are completed.

1) Verify that a shunt is installed onto pins 1 and 2 and

jumper JU1 (EV kit enabled).

2) Verify that jumper JU2 is opened (No load is connect-

ed across VSYS and PGND).

3) Set the power supply output to 3.4V, and disable the

power supply.

4) Connect the power supply between the VSYS and

PGND terminal posts.

5) Connect the DMM between the VSC and PGND

terminal posts.

6) Enable the power supply and verify that the super cap

voltage at VSC is ramping up and stops at about 2.7V.

7) Disable and disconnect the power supply from the

VSYS and PGND terminal posts.

8) Verify that VSYS drops to about 3V and VSC drops

to about 2.5V.

9) Install jumper JU2. This connects a 51Ω load across

VSYS and PGND.

10) Verify that VSYS remains at 3V while VSC is ramping

down toward 0.5V.

11) Verify that VSYS is 0V when VSC drops below 0.5V.