SiC471, SiC472, SiC473, SiC474

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Vishay Siliconix

S21-0217-Rev. F, 08-Mar-2021

4

Document Number: 75786

For technical questions, contact: powerictechsupport@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Note

(1) For input voltages below 5 V, provide a separate supply to VCIN of at least 5 V to prevent the internal VDD rail UVLO from triggering

RECOMMENDED OPERATING CONDITIONS (all voltages referenced to GND = 0 V)

PARAMETER

MIN.

TYP.

MAX.

UNIT

Input voltage (VIN)4.5

-

55

V

Control input voltage (VCIN) (1)

4.5

-

55

Enable (EN)

0

-

55

Bias supply (VDD)

4.75

5

5.25

Drive supply voltage (VDRV)

4.75

5.3

5.55

Output voltage (VOUT)

0.8

-

0.92 x VIN

Temperature

Recommended ambient temperature

-40 to +105

°C

Operating junction temperature

-40 to +125

ELECTRICAL SPECIFICATIONS (VIN = VCIN = 48 V, VEN = 5 V, TJ = -40 °C to +125 °C, unless otherwise stated)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

Power Supplies

VDD supply

VDD

VIN = VCIN = 6 V to 55 V

4.75

5

5.25

V

VIN = VCIN = 5 V

4.7

5

-

VDD dropout

VDD_DROPOUT

VIN = VCIN = 5 V, IVDD = 1 mA

-

70

-

mV

VDD UVLO threshold, rising

VDD_UVLO

4

4.25

4.5

V

VDD UVLO hysteresis

VDD_UVLO_HYST

-

225

-

mV

Maximum VDD current

IDD

VIN = VCIN = 6 V to 55 V

3

-

-

mA

VDRV supply

VDRV

VIN = VCIN = 6 V to 55 V

5.1

5.3

5.55

V

VIN = VCIN = 5 V

4.8

5

5.2

VDRV dropout

VDRV_DROPOUT

VIN = VCIN = 5 V, IVDD = 10 mA

-

160

-

mV

Maximum VDRV current

VDRV

VIN = VCIN = 6 V to 55 V

50

-

-

mA

VDRV UVLO threshold, rising

VDRV_UVLO

4

4.25

4.5

V

VDRV UVLO hysteresis

VDRV_UVLO_HYST

-

295

-

mV

Input current

IVCIN

Non-switching, VFB > 0.8 V

-

235

325

μA

Shutdown current

IVCIN_SHDN

VEN = 0 V

-

4

8

Controller and Timing

Feedback voltage

VFB

TJ = 25 °C

796

800

804

m/V

TJ = -40 °C to +125 °C (1)

792

800

808

VFB input bias current

IFB

-2

-

nA

Transconductance

gm

-0.3

-

mS

COMP source current

ICOMP_SOURCE

15

20

-

μA

COMP sink current

ICOMP_SINK

15

20

-

Minimum on-time

tON_MIN.

-

90

110

ns

tON accuracy

tON_ACCURACY

-10

-

10

%

On-time range

tON_RANGE

110

-

8000

ns

Frequency range

fsw

Ultrasonic mode enabled

20

-

2000

kHz

Ultrasonic mode disabled

0

-

2000

Minimum off-time

tOFF_MIN.

190

250

310

ns

Soft start current

ISS

35

7

μA

Soft start voltage

VSS

When VOUT reaches regulation

-

1.5

-

V