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L4973 数据表(PDF) 7 Page - STMicroelectronics

部件名 L4973
功能描述  3.5A step down switching regulator
PDF  27 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4973 数据表(HTML) 7 Page - STMicroelectronics

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L4973
Electrical characteristics
7/27
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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