L7987 datasheet(8/37 Pages) STMICROELECTRONICS

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Electrical characteristics

L7987

8/37

DocID025589 Rev 3

Electrical characteristics

All the population tested at TJ = 25 °C, VIN = VCC = 24 V and VEN =3 V unless otherwise

specified.

Table 5. Electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max. Unit

VIN

Operating input voltage range

(1)

4.5

RDSON HS High side RDSON

ISW = 0.5 A

0.2

0.32



ISW = 0.5 A

(1)

0.2

0.42



fSW

Switching frequency

FSW floating

233

250

267

kHz

FSW floating

(1)

225

250

275

kHz

Selected switching frequency

RSW = 10 k 

1350

1500

1650

kHz

IPK

Peak current limit

ILIM floating; VFB = 0.6 V

(2)

3.4

4.0

4.6

Selected peak current limit

RILIM = 100 k VFB = 0.6 V

(2)

0.68

0.85

1.01

ISKIP

Pulse skipping peak current

(2)

0.5

VFOLD

Feedback foldback level

(3)

400

TONMAX Maximum on time

µs

TONMIN

Minimum on time

120

150

TOFFMIN Minimum off time

(3)

360

VCC / VBIAS

VCCH

VCC UVLO rising threshold

(1)

3.85

4.10

4.30

VCCHYST VCC UVLO hysteresis

(1)

160

250

340

SWO

VBIAS threshold

Switch internal supply from VCC to

VBIAS. VBIAS ramping up from 0 V.

(1)

2.84

2.90

2.96

Hysteresis

(3)

VCC - VBIAS threshold

Switch internal supply from VCC to

VBIAS. VIN = VCC = 24 V, VBIAS

falling from 24 V to GND.

(1)

3.35

4.05

4.90

Hysteresis

(3)

750

Power consumption

ISHTDWN Shutdown current from VIN

VEN = GND

A

IQUIESC

Quiescent current from VIN and

VCC

LX floating, VFB = 1 V,

VBIAS = GND, FSW floating

2.5

3.4

IQOPVIN

Quiescent current from VIN and

VCC

LX floating, VFB = 1 V,

VBIAS = 3.3 V, FSW floating

1.0

1.4

IQOPVBIAS Quiescent current from VBIAS

1.6

2.4

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