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L4973D3 数据表(PDF) 4 Page - STMicroelectronics

部件名 L4973D3
功能描述  3.5A STEP DOWN SWITCHING REGULATOR
PDF  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4973D3 数据表(HTML) 4 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS ( Refer to the test circuit,VCC = 24V; Tj =25
°C, COSC = 2.7nF;
ROSC = 20K
Ω; unless otherwise specified)
• = specificationsreferred to T
J from 0 to 125
°C.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
DYNAMIC CHARACTERISTICS
Input Voltage Range (*)
VO =VREF to 40V; IO =3.5A
•
855
V
Output Voltage
L4973V5.1
IO = 1A
5.05
5.1
5.15
V
IO = 0.5A to 3.5A
5.00
5.1
5.20
V
VCC = 8V to 55V
• 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
3.292
3.36
3.427
V
VCC = 8V to 40V
• 3.26
3.36
3.46
V
RDSON
VCC = 10.5V
0.15
0.22
Ω
IO =3.5A
•
0.35
Ω
Maximum Limiting Current
VCC = 8V to 55V
•
4
4.5
5.5
A
η
Efficiency
VO = 5.1V; IO =3.5A
90
%
VO = 3.3V; IO =3.5A
85
%
Switching Frequency
•
90
100
110
KHz
Supply Voltage Ripple
Rejection
Vi =VCC +2VRMS
VO =Vref;IO = 1A; fripple = 100Hz
60
dB
∆fsw
Switching Frequency Stability
vs, Supply Voltage
VCC = 8V to 55V
2
5
%
REFERENCE SECTION
Reference Voltage
5.025
5.1
5.175
V
Iref = 0 to 20mA;
VCC = 8 to 55V
• 4.950
5.1
5.250
V
Line Regulation
Iref = 0mA;
VCC = 8 to 55V
510
mV
Load Regulation
Vref = 0 to 5mA;
VCC = 0 to 20mA
2
6
10
25
mV
mV
Short Circuit Current
30
65
100
mA
SOFT START
Soft Start Charge Current
30
45
60
µA
Soft Start Discharge Current
15
22
30
µA
INHIBIT
High Level Voltage
•
3.0
V
Low Level Voltage
•
0.8
V
Isource High Level
VINH =3V
•
10
16
50
µA
Isource Low Level
VINH = 0.8V
•
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
L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
4/16



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