E-L4973V3.3 datasheet(7/27 Pages) STMICROELECTRONICS

No de pièce	E-L4973V3.3

Description	3.5A step down switching regulator

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L4973

Electrical characteristics

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Soft start

Soft Start Charge

Current

30

45

60

µA

Soft Start Discharge

Current

15

22

30

µA

Inhibit

High Level Voltage

(2)

3.0

V

Low Level Voltage

(2)

0.8

V

Isource High Level

VINH = 3V

(2)

10

16

50

µA

Isource Low Level

VINH = 0.8V

(2)

10

15

50

µA

DC characteristics

Total Operating

Quiescent Current

Duty Cycle = 50%

4

6

mA

Quiescent Current

Duty Cycle = 0

2.7

4

mA

Total stand-by quiescent

current

VCC = 24V; VINH = 5V

100

200

µA

VCC = 55V; VINH = 5V

150

300

µA

Error amplifier

High Level Output

Voltage

11.0

V

Low Level Output

Voltage

0.65

V

Source Bias Current

1

2

3

µA

Source Output Current

200

300

600

µA

Sink Output Current

200

300

µA

Supply Voltage Ripple

Rejection

VCOMP = VFB

CREF = 4.7µF 1-5mA load

current

60

80

dB

DC Open Loop Gain

RL = ∞

50

60

dB

Transconductance

Icomp = -0.1 to 0.1mA;

Vcomp = 6V

2.5

mS

Oscillator section

Ramp valley

0.78

0.85

0.92

V

Table 4. Electrical characteristics (continued)

(Refer to the test circuit,VCC = 24V; TJ = 25°C, COSC = 2.7nF; ROSC = 20KΩ;

unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

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E-L4973V3.3 Fiches technique(PDF) 7 Page - STMicroelectronics

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