L4974A STMicroelectronics, L4974A Datasheet - Page 9

• Manufacturer Part Number: L4974A
• Description: IC REG SW 3.5A 5.1V-40V 20-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4974A

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5.1 ~ 40 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz
• Voltage - Input: 15 ~ 50 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Power - Output: 1.3W
• Output Voltage: 40 V
• Output Current: 3.5 A
• Input Voltage: 15 V to 50 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• Duty Cycle (max): 90 %
• No. Of Outputs: 1
• Power Dissipation Pd: 5W
• No. Of Pins: 20
• Filter Terminals: Through Hole
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6699-5; L4974A

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
Symbol
I
V
V
V
V
V
V
V
I
2SO
2SI
I
I
9R
2H
3S
4R
4H
9F
2L
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
Vi = 15 to 50V
V3 = 50V; S1 = A
V
V
Vi = 15 to 50V
V
V
Vi = 15 to 50V
V
V
V
I
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
= 5.3V;
= 4.7V; V
Test Conditions
13
sw
= 100KHz)
V
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
Typ.
-100
-200
Vref
V
0.5
5.1
1.1
5.1
60
1
ref
Max.
-160
5.25
5.25
100
V
-80
V
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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