L5985 datasheet(5/37 Pages) STMICROELECTRONICS

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L5985

Electrical characteristics

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Electrical characteristics

TJ = 25 °C, VCC = 12 V, unless otherwise specified.

Table 4.

Electrical characteristics

Symbol

Parameter

Test condition

Values

Unit

Min

Typ

Max

VCC

Operating input voltage

range

(1)

2.9

VCCON

Turn on VCC threshold

(1)

2.9

VCCOFF

Turn off VCC threshold

(1)

2.4

RDS(on)

MOSFET on resistance

140

170

(1)

140

220

ILIM

Maximum limiting current

2.5

2.9

3.3

Oscillator

FSW

Switching frequency

225

250

275

kHz

(1)

220

275

VFSW

FSW pin voltage

1.254

Duty cycle

100

FADJ

Adjustable switching

frequency

RFSW = 33 kΩ

1000

kHz

Dynamic characteristics

VFB

Feedback voltage

2.9 V < VCC < 18 V

(1)

0.593

0.6

0.607

DC characteristics

Quiescent current

Duty cycle = 0,

VFB = 0.8 V

2.4

IQST-BY

Total stand-by quiescent

current

μA

Inhibit

INH threshold voltage

Device ON level

0.6

Device OFF level

1.9

INH current

INH = 0

7.5

μA

Soft-start

TSS

Soft-start duration

FSW pin floating

7.4

8.2

9.1

FSW = 1 MHz,

RFSW = 33 kΩ

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