MAX77650 datasheet(9/27 Pages) MAXIM

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Evaluates: MAX77650/MAX77651

MAX77650/MAX77651 Evaluation Kit

Electronic Load

The EV kit comes with an electronic load that allows the

user to easily evaluate the SIMO and LDO. An on-board

DAC and op-amp configuration set the load current

through I2C. J201, J203, J205, and J207 connect the

load to the output of the SBB0, SBB1, SBB2, and LDO,

respectively. Emulate SYS loading by removing J207 and

connecting pin 1 of the header to VSYS with a wire. To

exercise the load transient response, remove J200 (for

SBB0), J202 (for SBB1), J204 (for SBB2), or J206 (for

LDO) and connect a signal generator to the gate of the

load MOSFET (pin 2 of the header). Drive the MOSFET

gate with a signal between 1V (off) and 3V (fully on) to

apply transients to the output of the SIMO or LDO. Note

that there is a 1Ω sense resistor that has test point access

(called VIL_SBB0, VIL_SBB1, VIL_SBB2, and VIL_LDO)

that allows for a 1:1 conversion of load current to voltage.

See the Software section for how to set the load current

from the GUI.

On-Board ADC (MAX11614)

An on-board ADC is available to convert the output volt-

ages of SBB0, SBB1, SBB2, and LDO. The AMUX pin of

the MAX77650/MAX77651, test points AIN1 and AIN7,

and battery current (IBATT) are also measured. The GUI

does the appropriate conversions. See the Software sec-

tion for how to read these values from the GUI.

Software

The graphical user interface (GUI) software allows for

quick, easy, and thorough evaluation of the MAX77650/

MAX77651.

The GUI is designed to have individual tabs for each func-

tional block of the device (global resources, interrupts/status,

GPIO, charger, SIMO buck-boost, LDO, and LED driver)

and two additional tabs for controlling EV kit hardware

(load control and AMUX/ADC). See Figure 8 for a screen-

shot of the GUI upon first opening.

Figure 7. Electronic Load Block Diagram

MAX5815

DAC

REGULATOR OUTPUT

1Ω

SENSE

RESISTOR

JUMPER A

JUMPER B

REGULATOR

OUTPUT

JUMPER A

JUMPER B

SBB0

SBB1

SBB2

LDO

SENSE

J200

J201

VIL_SBB0

J202

J203

VIL_SBB1

J204

J205

VIL_SBB2

J206

J207

VIL_LDO

SENSE

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