NB679A

–28V VIN, FIXED 5.1V-8A BUCK CONVERTER WITH LDO AND LP# VOUT SCALING

NB679A 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

VIN under-voltage lockout threshold

hysteresis

VINHYS

450

mV

LP# Logic

LP# rising threshold

VLP#_H

1.2

1.3

1.4

V

LP# hysteresis

VLP#-HYS

150

mV

LDO Regulator

LDO regulator

VLDO

VEN = 3.3V, VOUT = 0V

4.85

4.97

5.12

V

LDO load regulation

VEN = 3.3V, VOUT = 0V ,

LDO load = 100mA

2

%

LDO I-LIMIT

(5)

ILDO_Limit

VEN = 3.3V, VOUT = 0V , VLDO

= 4.5V

135

mA

Switch Rdson

(5)

RSwitch

ILDO = 50mA

0.9

1.2

Ω

VCC Regulator

VCC regulator

VCC

3.5

3.6

3.7

V

VCC load regulation

Icc = 5mA

5

%

Power Good

PG when FB risng (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 4mA

0.4

V

Power good leakage current

IPG_LEAK

VPG = 3.3V

5

μA

Thermal Protection

Thermal shutdown

(5)

TSD

140

°C

Thermal shutdown hysteresis

(5)

TSD-HYS

25

°C

NOTE:

5) Guaranteed by design.