L7987L datasheet(8/41 Pages) STMICROELECTRONICS

Part #	L7987L

Description	Adjustable current limitation

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Electrical characteristics

L7987L

8/41

DocID026362 Rev 3

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

61

V

RDSON HS High-side RDSON

ISW = 0.5 A

0.30

0.48



ISW = 0.5 A

(1)

0.30

0.57



fSW

Switching frequency

FSW floating

233

250

267

kHz

FSW floating

(1)

225

250

275

kHz

Selected switching

frequency

RFSW = 10 k

1350 1500 1650 kHz

IPK

Peak current limit

RILIM = 27 k; VFB = 0.6 V

(2)

2.65

3.05

3.45

A

Selected peak current limit

RILIM = 100 k; VFB = 0.6 V

(2)

0.68

0.85

1.01

A

ISKIP

Pulse skipping peak current

(2)

0.5

A

VFOLD

Feedback foldback level

(3)

400

mV

TONMAX Maximum On time

12

µs

TONMIN Minimum On time

120

150

ns

TOFFMIN Minimum Off time

(3)

360

ns

VCC / VBIAS

VCCH

VCC UVLO rising threshold

(1)

3.85

4.10

4.30

V

VCCHYST VCC UVLO hysteresis

(1)

160

250

340

mV

SWO

VBIAS threshold

Switch internal supply from VCC to VBIAS.

VBIAS ramping up from 0 V.

(1)

2.84

2.90

2.96

V

Hysteresis

(3)

80

mV

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

V

Hysteresis

(3)

750

mV

Power consumption

ISHTDWN Shutdown current from VIN

VEN = GND

11

16

µA

IQUIESC

Quiescent current from VIN

and VCC

LX floating, VFB = 1 V, VBIAS = GND,

FSW floating

2.5

3.4

mA

IQOPVIN

Quiescent current from VIN

and VCC

LX floating, VFB = 1 V, VBIAS = 3.3 V,

FSW floating

1.0

1.4

mA

IQOPVBIAS

Quiescent current from

VBIAS

1.6

2.4

mA

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