NB679

— 28V VIN, FIXED 5V-8A BUCK CONVERTER WITH LDO

NB679 Rev. 1.03

www.MonolithicPower.com

5

7/27/2017

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© 2017 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS (continued)

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

Parameters

Symbol

Condition

Min

Typ

Max

Units

Enable and UVLO

EN rising threshold

VEN_H

1.2

1.3

1.4

V

EN hysteresis

VEN-HYS

150

mV

ENLDO rising threshold

VEN_H

1.2

1.3

1.4

V

ENLDO hysteresis

VEN-HYS

150

mV

EN high limit @ USM

VEN_H_USM

1.8

V

EN low limit @ normal

VEN_L_Normal

2.6

V

EN input current

IEN

VEN = 2 V

5

μA

VEN = 0 V

0

VIN under-voltage lockout threshold

rising

VINVTH

4.45

4.7

V

VIN under-voltage lockout threshold

hysteresis

VINHYS

450

mV

LDO regulator

LDO regulator

VLDO

VEN = 0 V

4.85

4.97

5.12

V

LDO load regulation

VEN = 0 V, LDO load =100 mA

2

%

LDO Iimit

(5)

ILDO_Limit

VEN = 0 V, VLDO = 4.5 V

135

mA

Switch Rdson

(5)

RSwitch

ILDO = 50 mA

0.9

1.2

Ω

VCC regulator

VCC regulator

VCC

3.5

3.6

3.7

V

VCC load regulation

Icc = 5 mA

5

%

Power good

PG when FB rising (good)

PG_Rising(Good) VFB rising, percentage of VFB

95

%

PG when FB falling (fault)

PG_Falling(Fault) VFB falling, percentage of VFB

85

PG when FB rising (fault)

PG_Rising(Fault) VFB rising, percentage of VFB

115

PG when FB falling (good)

PG_Falling(Good) VFB falling, percentage of VFB

105

Power good low to high delay

PGTd

750

μs

EN low to power good low delay

PGTd_EN low

5

μs

Power good sink current capability

VPG

Sink 4 mA

0.4

V

Power good leakage current

IPG_LEAK

VPG = 3.3 V

5

μA

Thermal protection

Thermal shutdown

(5)

TSD

140

°C

Thermal shutdown hysteresis

(5)

TSD-HYS

25

°C

NOTE:

5) Guaranteed by design.