L5987TR 데이터 시트보기 (PDF) - STMicroelectronics

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L5987TR

3 A step-down switching regulator

STMicroelectronics 

Electrical characteristics

4

Electrical characteristics

L5987

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

Table 4. Electrical characteristics

Symbol

Parameter

Test condition

VCC

Operating input voltage range

(1)

VCCON Turn-on VCC threshold

(1)

VCCHYS VCC UVLO hysteresis

(1)

RDS(on) MOSFET on resistance

(1)

ILIM

Maximum limiting current

Oscillator

Values

Unit

Min. Typ. Max.

2.9

0.175

18

2.9

V

0.3

140 170

m

140 220

3.5

4.0

4.4

A

FSW Switching frequency

VFSW

D

FSW pin voltage

Duty cycle

FADJ Adjustable switching frequency

Dynamic characteristics

VFB

Feedback voltage

DC characteristics

(1)

RFSW = 33 k

2.9 V < VCC < 18 V(1)

225 250 275

kHz

220

265

1.262

V

0

100

%

1000

kHz

0.593 0.6 0.607 V

IQ

IQST-BY

Inhibit

Quiescent current

Total standby quiescent current

Duty cycle = 0, VFB = 0.8 V

2.4 mA

20

30

A

INH threshold voltage

INH current

Soft-start

Device ON level

Device OFF level

INH = 0

0.6

V

1.9

7.5

10

A

TSS

Soft-start duration

FSW pin floating

7.4

8.2

9.1

ms

FSW = 1 MHz, RFSW = 33 k

2

6/40

DocID14972 Rev 4

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