L4973D5.1-013TR datasheet(6/27 Pages) STMICROELECTRONICS

Part #	L4973D5.1-013TR

Description	3.5A step down switching regulator

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Electrical characteristics

L4973

6/27

4

Electrical characteristics

Table 4. Electrical characteristics

(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

Dynamic characteristics

Input Voltage Range (1)

VO = VREF to 40V; IO = 3.5A (2)

855

V

Output Voltage

L4973V5.1

IO = 1A

5.05

5.1

5.15

V

IO = 0.5A to 3.5A VCC = 8V

to 55V

5.00

5.1

5.20

V

(2)

4.95

5.1

5.25

V

Output Voltage

L4973V3.3

IO = 1A

3.326

3.36

3.393

V

IO = 0.5A to 3.5A VCC = 8V

to 40V

3.292

3.36

3.427

V

(2)

3.26

3.36

3.46

V

RDS(on )

VCC = 10.5V IO = 3.5A

0.15

0.22

Ω

(2)

0.35

Ω

Maximum Limiting

Current

VCC = 8V to 55V

(2)

3.8

4.5

5.5

A

4

4.5

5.5

A

η

Efficiency

VO = 5.1V; IO = 3.5A

90

%

VO = 3.3V; IO = 3.5A

85

%

Switching Frequency

(2)

90

100

110

KHz

Supply Voltage Ripple

Rejection

Vi = VCC+2VRMS VO = Vref;

IO = 1A; fripple = 100Hz

60

dB

∆f

sw

Switching Frequency

Stability vs., Supply

Voltage

VCC = 8V to 55V

2

5

%

Reference section

Reference Voltage

Iref = 0 to 20mA;

VCC = 8 to 55V

5.025

5.1

5.175

V

(2)

4.950

5.1

5.250

V

Line Regulation

Iref = 0mA;

VCC = 8 to 55V

5

10

mV

Load Regulation

Vref = 0 to 5mA;

VCC = 0 to 20mA

2

6

10

25

mV

Short Circuit Current

30

65

100

mA

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