MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS

MP2338 Rev. 1.0

www.MonolithicPower.com

5

12/11/2020

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© 2020 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TJ = -40°C to +125°C (7), typical values are tested at TJ = 25°C, unless otherwise noted.

The over-temperature limit is derived by characterization, unless otherwise noted.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Power Supply

VIN under-voltage

lockout threshold

VINUVLO-R

VIN rising, VEN = 2V

3.66

3.96

4.25

V

VIN under-voltage

lockout hysteresis

VINUVLO-HYS

330

mV

Shutdown supply current

ISD

VEN = 0V

2

10

μA

Quiescent supply current

IQ

VEN = 2V, VFB = 0.55V

160

250

μA

Enable Control

EN rising threshold

VEN-RISE

1.1

1.2

1.3

V

EN hysteresis

VEN-HYS

120

mV

EN input current

IEN

VEN = 2V

2

10

µA

Power Switch

High-side switch on

resistance

HSRDS(ON)

VBST-SW = 5V

115

mΩ

Low-side switch on

resistance

LSRDS(ON)

55

mΩ

Switch leakage

SWLKG

VEN = 0V，VIN = 24V, SW short to VIN

1

μA

Current Limit

Low-side switching valley

current limit

ILIMIT-LS-OC

2.9

3.75

4.6

A

ZCD

IZCD

VIN = 12V, VOUT = 5V, L = 6.8μH

0

50

200

mA

Frequency

Oscillator frequency

fSW

VIN = 12V,VOUT = 5V, IOUT = 1.5A

350

450

550

kHz

Minimum on time (8)

tON-MIN

50

ns

Minimum off time (8)

tOFF-MIN

160

ns

Feedback Control

Feedback voltage

VREF

TJ = 25°C

495

500

505

mV

TJ = -40°C to +125°C

492.5

500

507.5

mV

Feedback current

IFB

VFB = 0.52V

10

50

nA

Soft-start current

ISS

5.5

7.5

9.5

μA