NB681- 28V, 6 A, HIGH-CURRENT SYNCHRONOUS BUCK CONVERTER WITH 2-BIT VID

NB681 Rev. 1.04

www.MonolithicPower.com

5

12/28/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2017 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS (continued)

VIN = 12 V, 3V3 = 3.3 V, TJ = 25C, unless otherwise noted.

Parameters

Symbol

Condition

Min

Typ

Max

Units

Internal reference voltage

VREF,

MODE=150k

LP# = 0

(5)

0

mV

LP# = 1, C1 = 0, C0 = 0

1000

mV

LP# = 1, C1 = 0, C0 = 1

1075

mV

LP# = 1, C1 = 1, C0 = 0

1150

mV

LP# = 1, C1 = 1, C0 = 1

1200

mV

Soft-start time

TSS

En to PG up

0.9

1.3

1.5

ms

VID change slew rate

SRVID

MODE = Float or 150 k

5

10

mV/μs

MODE = 100 k

25

35

mV/μs

MODE = 0

10

20

mV/μs

VID change timer (EOPIO)

(5)

TVID EOPIO

MODE = 100 k

10

µs

LP# exit timer

(5)

TLP#_exit

MODE = Float

45

μs

MODE = 0/100 k/150 k

240

μs

MODE

Mode source current

IMODE

9

10

11.6

μA

Enable and UVLO

EN UVLO rising threshold

VEN H UVLO

1.1

1.2

1.3

V

EN hysteresis

VEN HYS

100

mV

EN high limit @USM

VEN H USM

1.6

V

EN low limit @Normal

(5)

VEN L Normal

2.3

V

Enable input current

IEN

VEN = 3.3 V

5

μA

VEN = 0 V

0

VCC under-voltage lockout

threshold rising

VCCVth

2.8

3.0

3.13

V

VCC under-voltage lockout

threshold hysteresis

VCCHYS

200

mV

VIN under-voltage lockout

threshold rising

VINVTH

4.2

4.4

V

VIN under-voltage lockout

threshold hysteresis

VINHYS

300

mV

LP# , C1, C0 logic

Rising threshold

VLH

0.39

0.6

0.79

V

Hysteresis

VLHYS

100

mV

Input current

ILIN

V LP#,C1,C0 = 3.3 V

1

μA

Power good

PG when Vout risng (good)

PG Rising(GOOD) VFB rising, percentage of VREF

95

%

PG when Vout falling (fault)

PG Falling(Fault)

VFB falling, percentage of VREF

90

PG when Vout rising (fault)

PG Rising(Fault)

VFB rising, percentage of VREF

115

PG when Vout falling (good)

PG Falling(Fault)

VFB falling, percentage of VREF

105