MPQ9842

– 36V, 2A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER

MPQ9842 Rev. 1.1

www.MonolithicPower.com

5

7/29/2022

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© 2022 MPS. All Rights Reserved.

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

Output voltage accuracy for the

MPQ9842-33

3217

3300

3895

mV TJ

=

25°C

3743

3800

3857

mV

3383

mV

TJ = +25°C

3250

3300

3800

3895

mV TJ

=

25°C

3743

3800

3857

mV

3350

mV

Output voltage accuracy for the

MPQ9842-5

4875

5000

5125

mV

TJ = +25°C

4925

5000

5075

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 = 180k

Ω or from sync clock

400

475

550

kHz

RFREQ = 82k

Ω or from sync clock

850

1000

1150

kHz

RFREQ = 27k

Ω 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%

4.0

5.0

6.8

A

Low-side valley current limit

ILIMIT_LS

VOUT = 3.3V, L = 4.7µH

2.5

3.8

5.1

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