MP9459 – SYNCHRONOUS, STEP-DOWN CONVERTER W/ INTERNAL MOSFETS

MP9459 Rev. 1.0

www.MonolithicPower.com

4

1/13/2020

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ELECTRICAL CHARACTERISTICS

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

Parameter

Symbol

Condition

Min

Typ

Max

Units

Supply current (shutdown)

IIN

VEN = 0V

10

μA

Supply current (quiescent)

IQ

VEN = 2V, VFB = 0.85V

170

200

250

μA

HS switch on resistance

HSRDS(ON)

VBST-SW = 3.3V

60

mΩ

LS switch on resistance

LSRDS(ON)

30

mΩ

Switch leakage

SWLKG

VEN = 0V, VSW = 12V

10

μA

Valley current limit

ILIMIT

VOUT = 0V

5

A

Zero-current detection

(ZCD)

IZCD

VOUT = 3.3V, LO =

2.2μH,

IOUT = 0A

-250

20

+250

mA

Oscillator frequency

fSW

VFB = 0.75V

420

600

780

kHz

Minimum on time (8)

tON_MIN

45

ns

Minimum off time (8)

tOFF_MIN

180

ns

Feedback voltage

VREF

TJ = 25°C

793

805

817

mV

Feedback current

IFB

10

100

nA

Feedback under-voltage

threshold (H to L)

VUV_th

Hiccup entry

75%

VREF

Hiccup duty cycle (8)

DHiccup

25

%

EN rising threshold

VEN_RISING

1.14

1.2

1.26

V

EN hysteresis

VEN_HYS

100

mV

EN input current

IEN

VEN = 2V

2

µA

VIN under-voltage lockout

rising threshold

INUVVth

3.7

4

4.18

V

VIN under-voltage lockout

hysteresis threshold

INUVHYS

330

mV

Soft-start period

tSS

1.6

2.5

3

ms

Thermal shutdown (8)

TSD

150

°C

Thermal hysteresis (8)

TSDHYS

20

°C

Notes:

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

8) Guaranteed by design and engineering sample characterization.