L7983 datasheet(7/43 Pages) STMICROELECTRONICS

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Electrical characteristics

TJ = 25 °C, VIN = 24 V, VEN/UVLO = VIN, LNM selected, fSW = 1 MHz unless otherwise specified.

Table 6. Electrical characteristics

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Turn on and power section characteristics

VINH

VIN turn-on

VIN rising

2.6

2.8

3.0

VINL

VIN turn-off

VIN falling

2.5

2.7

2.9

Hysteresis

0.1

VWAKEUPH Wake-up ON threshold

VEN rising

0.7

VWAKEUPL

Wake-up OFF threshold

VEN falling

0.2

VENH

Enable ON threshold

VEN rising

1.1

1.2

1.3

VENL

Enable OFF threshold

VEN falling

0.9

1.0

1.1

Hysteresis

0.2

IPK

Peak current limit

Duty cycle < 20% (1)

0.42

0.47

0.52

Duty cycle = 100%, closed loop operation (1)

0.35

0.39

0.43

IVY

Valley current limit

(1)

0.43

0.52

0.61

ISKIP

Skip current limit

(1)

0.08

INEG

Reverse current limit

LNM selected, VFB = 0.9 V (1)

- 0.15

HS RDSON HS MOS ON resistance

ILX = 0.2 A

1.9

2.5

LS RDSON

LS MOS ON resistance

ILX = 0.2 A

0.85

1.2

fSW

Selected switching frequency

RFSW = 5.6 kΩ

450

500

550

kHz

RFSW = 0 Ω

900

1000

1100

RFSW = 56 kΩ

1980

2200

2420

Duty cycle

100

tON MIN

Minimum HS MOS on-time

tSS

Internal soft-start time

1.3

2.7

VCC and VBIAS

VCC

LDO output voltage

VBIAS = GND

2.9

3.3

3.6

VBIAS = 5 V

2.9

3.3

3.6

SWO

Switchover threshold

VBIAS increasing

3.2

Hysteresis

0.075

Power consumption

ISHTDWN

Shutdown current from VIN

VEN/UVLO = GND

2.3

3.2

µA

IQVIN

Quiescent current from VIN, LCM

(refer to Section 5.5 VCC and

switchover)

VBIAS = 5 V, VOUT = 1.05 * VREF(2)

VBIAS = GND, VOUT = 1.05 * VREF(2)

Quiescent current from VIN, LNM

VBIAS = 5 V, VOUT = 1.05 * VREF

170

205

VBIAS = GND, VOUT = 1.05 * VREF

1300

1500

L7983

Electrical characteristics

DS13354 - Rev 1

page 7/43

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