MP8861 – 2.85V - 18V, 6A, SYNCHRONOUS, STEP-DOWN CONVERTER

MP8861 Rev. 1.1

www.MonolithicPower.com

4

5/28/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2020 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TJ = -40°C to +125°C (5), typical value is tested at TJ = +25°C, unless otherwise noted.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Supply current (shutdown)

IIN

VEN = 0V

2.1

4

μA

Supply current (quiescent)

Iq

No switching, FB = 105%

VREF, PFM mode

420

600

μA

HS switch on resistance

HSRDS(ON)

VBST - SW = 3.3V

29

mΩ

LS switch on resistance

LSRDS(ON)

VCC = 3.3V

14

mΩ

Switch leakage

SWLKG

VEN = 0V, VSW = 12V,

TJ = +25°C

1

μA

Low-side valley current limit

ILIMIT_L

Adjustable by I2C

8.5

A

Low-side negative current limit

ILIMIT_LN

In forced PWM mode or

OVP state

-3

A

Low-side ZCD threshold

IZCD

TJ = +25°C

200

mA

Switching frequency

fSW1

VIN = 12V, VOUT = 1V

400

500

600

kHz

fSW2

VIN = 12V, VOUT = 5V

400

500

600

kHz

Minimum off time (6)

τOFF_MIN

185

ns

Minimum on time (6)

τON_MIN

VOUT = 0.6V

50

ns

Reference voltage

Vref

TJ = 25°C

-1%

720

+1%

mV

-40°C < TJ < 125°C (5)

-1.5%

720

+1.5%

FB current

IFB

VFB = 740mV

10

50

nA

A0 voltage threshold 1

VADD_1

Set I2C address 61H

0.24

VCC

A0 voltage threshold 2

VADD_2

Set I2C address 63H

0.28

0.49

VCC

A0 voltage threshold 3

VADD_3

Set I2C address 65H

0.53

0.72

VCC

A0 voltage threshold 4

VADD_4

Set I2C address 67H

0.77

VCC

A0 to GND pull-down resistor

RA0_PD

2

MΩ

EN rising threshold

VEN_RISING

1.1

1.2

1.3

V

EN threshold hysteresis

VEN_HYS

110

mV

EN to GND pull-down resistor

REN

1.5

MΩ

VIN under-voltage lockout

threshold rising

INUVVth_r

2.45

2.65

2.85

V

VIN under-voltage lockout

threshold falling

INUVVth_f

2.5

2.7

V

Power good UV threshold rising

PGVth-Hi

Good

0.86

0.9

0.94

VOUT

Power good UV threshold falling

PGVth-Lo

Fault

0.81

0.85

0.89

VOUT

Power good OV threshold rising

PGVth-Hi

Fault

1.11

1.15

1.19

VOUT

Power good OV threshold falling

PGVth-Lo

Good

1.01

1.05

1.09

VOUT

Power good deglitch time

PGTd

I2C programmable

30

μs

Power good sink current

capability

VPG

Sink 4mA

0.4

V