MAX77751 datasheet(3/9 Pages) MAXIM

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Evaluates: MAX77751

MAX77751 Evaluation Kit

Detailed Description of Hardware

Follow the initial test setup procedure.

Battery Charger Test Setup

The battery charger can be tested in three different ways

with a battery, battery simulator, or power supply with

electronic load.

Battery

1) Connect the 1 cell battery pack and current meter

between BATT and GND. Note: Only use a battery

with a charge termination voltage that matches that

of the MAX77751 populated on the board.

2) Connect the 5.0V/5.0A current-limited DC power

supply between CHGIN and GND and turn it on.

3) Observe the current reading from the current meter.

If the battery is discharged, the fast-charging current

should match the setting with the external IFAST

resistor (R4).

Battery Simulator

1) Connect the battery simulator between BATT and

GND, adjust the voltage to 3.8V with 3.5A current

limit, and turn it on.

2) Connect the 5.0V/5.0A current-limited DC power

supply between CHGIN and GND and turn it on.

3) Observe the current reading from the battery simula-

tor and see if the fast-charging current matches with

the external IFAST resistor.

Power Supply with Electronic Load

1) Connect the power supply between BATT and GND

and adjust the voltage to 3.8V with 3.5A current limit.

2) Connect the electronic load between BATT and GND

and set the load current to 3.5A.

3) Turn on the power supply and electronic load.

4) Connect the 5.0V/5.0A current-limited DC power

supply between CHGIN and GND and turn it on.

5) Observe the current reading from the current meter

1 and 2 (the fast-charging current equals I1-I2) and

see if this value matches with the external IFAST

resistor.

Figure 3. Battery Charger Test with Real Battery Pack

Figure 4. Battery Charger Test with Battery Simulator

Figure 5. Battery Charger Test with Power Supply and

Electronic Load

Table 1. Default Shunt Positions and

Jumper Descriptions

JUMPER #

DEFAULT

POSITION

FUNCTION

Open

1-2 Disable Charger

Open

1-2 Enable the Reverse Boost

MAX77751

BATT

GND

1 CELL

BATTERY

PACK

MAX77751

BATT

GND

BATTERY

SIMULATOR

MAX77751

BATT

GND

POWER

SUPPLY

ELECTRONIC

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