L4974 STMicroelectronics, L4974 Datasheet - Page 9

• Manufacturer Part Number: L4974
• Description: 3.5A SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

RESET AND POWER FAIL FUNCTIONS
ELECTRICAL CHARACTERISTICS (continued)
Figure 5 : Test and Evaluation Board Circuit.
TYPICAL PERFORMANCES (using evaluation board) :
n = 83% (V
V
Line regulation = 12mV (V
Load regulation = 8mV (I
for component values Refer to the fig. 5 (Part list).
o RIPPLE
Symbo l
I
V
V
V
V
V
V
V
I
2SO
2SI
I
I
9R
2H
4R
4H
9F
2L
3S
3
4
= 30mV (at 1A)
i
Rising Thereshold Voltage
(pin 9)
Falling Thereshold Voltage
(pin 9)
Delay High Threshold Volt.
Delay Low Threshold Volt.
Delay Source Current
Delay Source Sink Current
Output Saturation Voltage
Output Leak Current
Rising Threshold Voltage
Hysteresis
Input Bias Current
= 35V ; V
Parameter
o
= VREF ; I
o
i
= 1 to 3.5A)
= 15 to 50V)
o
= 3.5A ; f
V
V
Vi = 15 to 50V
V
Vi = 15 to 50V
V
Vi = 15 to 50V
V
V
V
I
V3 = 50V; S1 = A
V9 = V
3
i
4
4
4
4
4
4
= 15mA; S1 = B V
= 15 to 50V
= 5.3V
= 5.3V
= 5.3V V
= 4.7V V
= 5.3V;
= 4.7V; V
T est Co nd itions
13
sw
= 100KHz)
2
V
9
9
= 3V
2
= V
= V
= 3V
13
13
4
= 4.7V
4.955
Min.
-130
4.77
4.95
V
0.4
30
10
1
ref
T yp.
-100
-200
Vref
V
5.1
1.1
5.1
0.5
60
1
ref
Max.
-160
5.25
5.25
100
V
V
-80
1.2
0.4
0.6
80
3
ref
ref
Unit
mV
mV
mA
V
V
V
V
V
V
V
A
A
A
L4974A
Fig .
7D
7D
7D
7D
7D
7D
7D
7D
7D
7D
7D
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