MP8794

– 16V, 20A, SYNCHRONOUS STEP-DOWN CONVERTER

MP8794 Rev. 1.0

www.MonolithicPower.com

6

12/2/2019

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

© 2019 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

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

Parameters

Symbol

Condition

Min

Typ

Max

Units

Supply Current

Supply current (shutdown)

IIN

VEN = 0V

10

20

μA

Supply current (quiescent)

IIN

VEN = 2V, VFB = 0.62V

650

850

μA

MOSFET

HS switch on resistance

HSRDS(ON)

9

mΩ

LS switch on resistance

LSRDS(ON)

3

mΩ

Switch leakage

SWLKG_HS

VEN = 0V, VSW = 0V

0

10

μA

SWLKG_LS

VEN = 0V, VSW = 12V

0

30

Current Limit

Current limit threshold

VLIM

1.15

1.2

1.25

V

ICS to IOUT ratio

ICS/IOUT

IOUT

≥ 2A

9

10

11

μA/A

Low-side negative current limit

ILIM_NEG

-18

A

Negative current limit time out (8)

tNCL_Timer

200

ns

Switching Frequency

Switching frequency

fSW

MODE = AGND, IOUT = 0A,

VOUT = 1V at 25°C

450

600

750

kHz

MODE = 30.1k

Ω to AGND,

IOUT = 0A, VOUT = 1V at 25°C

650

800

950

kHz

MODE = 60.4k

Ω to AGND,

IOUT = 0A, VOUT = 1V at 25°C

800

1000

1200

kHz

Minimum on time (8)

tON_MIN

VFB = 500mV

50

ns

Minimum off time (8)

tOFF_MIN

VFB = 500mV

180

ns

Over-Voltage and Under-Voltage Protection (OVP, UVP)

OVP threshold

VOVP

113%

116%

119%

VREF

UVP threshold

VUVP

77%

80%

83%

VREF

Feedback Voltage and Soft Start

Feedback voltage

VREF

TJ = -40°C to +125°C

594

600

606

mV

TJ = 0°C to 70°C

597

600

603

mV

REF/TRK sourcing current

ITRACK_Source VREF/TRK = 0V

42

μA

REF/TRK sinking current

ITRACK_Sink

VREF/TRK = 1V

12

μA

Soft-start time

tREF/TRK

CTRACK = 1nF, TJ = 25°C

0.75

1

1.25

ms

Error Amplifier

Error amplifier offset

VOS

-3

0

+3

mV

Feedback current

IFB

VFB = REF

50

100

nA

Enable and UVLO

Enable input rising threshold

VIHEN

1.17

1.22

1.27

V

Enable hysteresis

VEN-HYS

200

mV

Enable input current

IEN

VEN = 2V

0

μA

Soft shutdown discharge FET

RON_DISCH

80

150

Ω