Digital Power-Supply Controller/Monitor

with PMBus Interface

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5

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RST INPUT

RST Input Low Voltage

0.8

V

RST Input High Voltage

2.1

V

RST Input Bias Current

RST = DVDD or DGND

10

µA

Minimum SMBus Interface Reset

Pulse Width

1

455

µs

SMBus Interface Recovery Time

After Interface Reset

15

µs

Minimum Reset Pulse Width

565

µs

Recovery Time After Device Reset

15

µs

OTHER TIMING PARAMETERS

PMBus Command Response Time

300

µs

Overvoltage fault

5

Fault Response Time

Overcurrent fault

5

ms

unless otherwise noted.

Note 5: When an EEPROM is connected to A2/SDAE and A1/SCLE, these pins cannot be hardwired to ground or supply. They must

be connected through 33k

Ω ±5% resistors.

Note 6: Equivalent of having 33k

Ω pulldown resistor to DGND.

Note 7: Equivalent of having 33k

Ω pullup resistor to DVDD.

Typical Operating Characteristics

REFIN MODE SOFT-START

WITH TRACKING

MAX8688 toc01

2ms/div

0.5V/div

REFIN MODE SOFT-STOP

WITH TRACKING

MAX8688 toc02

2ms/div

0.5V/div