MPQ9840 – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER, AEC-Q100

MPQ9840 Rev. 1.02

www.MonolithicPower.com

5

7/1/2020

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ELECTRICAL CHARACTERISTICS

VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TJ =

+25°C.

Parameter

Symbol

Condition

Min

Typ

Max

Units

VIN quiescent current

IQ

VFB = 0.85V, no load, no

switching, TJ = +25°C

14

21

µA

VFB = 0.85V, no load, no switching

29

VIN shutdown current

ISHDN

VEN = 0V

2

6

µA

VIN under-voltage lockout

threshold rising

INUVRISING

2.4

2.8

3.2

V

VIN under-voltage lockout

threshold hysteresis

INUVHYS

150

mV

EN rising threshold

VEN_RISING

0.9

1.05

1.2

V

EN threshold hysteresis

VEN_HYS

120

mV

Feedback reference voltage

VREF

784

800

816

mV

TJ = 25°C

792

800

808

mV

HS switch on resistance

RON_HS

VBST - VSW = 5V

125

165

mΩ

LS switch on resistance

RON_LS

55

85

mΩ

Switching frequency

FSW

RFREQ = 180kΩ or from sync clock

400

475

550

kHz

RFREQ = 82kΩ or from sync clock

850

1000

1150

kHz

RFREQ = 27kΩ or from sync clock

2250

2500

2750

kHz

Minimum on time (6)

TON_MIN

80

ns

SYNC input low voltage

VSYNC_LOW

0.4

V

SYNC input high voltage

VSYNC_HIGH

1.8

V

Current limit

ILIMIT_HS

Duty cycle = 40%

4.6

5.6

7.4

A

Low-side valley current limit

ILIMIT_LS

VOUT = 3.3V, L = 4.7µH

3.1

4.4

5.7

A

ZCD current

IZCD

0.1

A

Reverse current limit

ILIMIT_REVERSE

3

A

Switch leakage current

ISW_LKG

0.01

1

µA

Soft-start current

ISS

VSS = 0.8V

5

10

15

µA

VCC regulator

VCC

5

V

VCC load regulation

ICC = 5mA

3.5

%

Thermal shutdown (6)

TSD

170

°C

Thermal shutdown hysteresis (6)

TSD_HYS

20

°C