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E-L4973D3.3 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. E-L4973D3.3
Description  3.5A step down switching regulator
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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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
(2)
0.35
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
mV
Short Circuit Current
30
65
100
mA




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