MP4541

– 80V, 0.8A, SYNCHRONOUS STEP-DOWN CONVERTER

MP4541 Rev. 1.0

MonolithicPower.com

4

5/28/2021

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© 2021 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = 48V, TJ = -40°C to +125°C (6), typical value is tested at TJ = 25°C, unless otherwise noted.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Power Supply

VCC under-voltage

lockout (UVLO) threshold

rising

VCCUVLO-R VCC rising

3.15

3.35

3.55

V

VCC UVLO threshold

hysteresis

VCCHYS

150

mV

VCC regulation voltage

IVCC = 2mA

4.5

4.85

5.2

V

Shutdown current

ISD

VEN = 0V, measured on VIN

2

μA

Quiescent current

IQ

VIN = 12V, VFB = 1.05V, no

switching, measured on VIN,

TJ = 25°C

15

μA

Enable (EN) Control

Micro-power EN start-up

threshold

0.9

V

Micro-power EN off

threshold

0.4

V

EN input high threshold

VEN_ON

VEN rising

1.15

1.25

1.35

V

EN hysteresis

VEN_H

VEN rising/falling

120

mV

Minimum off time

tMIN_OFF

VFB = 0V

150

ns

Minimum on time (7)

tMIN_ON

45

ns

Reference Voltage

FB reference voltage

VREF

8V to 100V, TJ = 25°C

0.99

1

1.01

V

8V to 100V, TJ = -40°C to +125°C

0.985

1

1.015

V

FB input current

IFB

VFB = 1.05V

50

nA

Soft-start (SS) time

tSS

10% to 90% of VREF

4.35

ms

FB under-voltage

threshold

VUVP

60%

VREF

Power Switch

LS-FET on resistance

RON_L

265

mΩ

Synchronous HS-FET on

resistance

RON_H

625

mΩ

Current Limit

LS-FET valley current limit

IVL_LIMT

Over full duty cycle, TJ = 25°C

0.72

0.8

0.88

A

Over full duty cycle,

TJ = -40°C to +125°C

0.68

0.8

0.92

A

Inductor current zero-

current detection (ZCD)

threshold

-60

0

+60

mA

Thermal Protection

Thermal shutdown (7)

TSD

150

°C

Thermal shutdown

hysteresis (7)

TSD_HYS

25

°C

Notes:

6) Not tested in production. Guaranteed by over-temperature correlation.

7) Guaranteed by engineering sample characterization.