L5981TR 查看數據表（PDF） - STMicroelectronics

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L5981TR

1A step-down switching regulator

STMicroelectronics 

Electrical characteristics

3

Electrical characteristics

L5981

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

Table 3. Electrical characteristics

Symbol

Parameter

Test condition

VCC

Operating input voltage (1)

range

VCCON Turn on VCC threshold

(1)

VCCOFF Turn off VCC threshold

(1)

RDSON MOSFET on resistance (1)

ILIM

Maximum limiting current

Oscillator

FSW Switching frequency

(1)

VFSW

D

FADJ

FSW pin voltage

Duty Cycle

Adjustable switching

frequency

Dynamic characteristics

RFSW=33kΩ

VFB Feedback voltage

DC characteristics

2.9V<VCC<18V

IQ

IQST-BY

Quiescent current

Total stand-by quiescent

current

Duty Cycle=0,

VFB=0.8V

Inhibit

INH threshold voltage

INH current

Device ON level

Device OFF level

INH=0

Soft start

TSS Soft start duration

FSW=Floating

FSW=1MHz,

RFSW=33kΩ

Values

Unit

Min Typ Max

2.9

18

2.9

V

2.4

x

150

x

mΩ

150 300

1.5 1.8 2.1

A

225 250 275

kHz

x

250

x

1.262

V

0

100

%

1000

kHz

0.593 0.6 0.607 V

2.4 mA

20

30

µA

0.6

V

1.9

7.5

10

µA

7.4 8.2 9.1

ms

2

5/37

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