L4973D3.3-013TR STMicroelectronics, L4973D3.3-013TR Datasheet - Page 19

• Manufacturer Part Number: L4973D3.3-013TR
• Description: IC REG SW STEP DOWN 3.5A 20-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D3.3-013TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 0.5 ~ 50 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Power - Output: 4W
• Output Voltage: 5.1 V
• Output Current: 3.5 A
• Input Voltage: 8 V to 55 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 97 %
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3358-2

L4973
Figure 33. Power dissipation vs. output
Figure 35. Load transient
2
1
(A)
Pdiss
I
3
2
1
O
(W)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
200μs/DIV
5
voltage (device only)
V
f
T
sw
T
CC
= 100KHz
= 35V
10
15
20
V
f
sw
CC
= 100KHz
= 35V
25
D97IN649
I
I
I
30
O
O
O
I
I
D97IN648
O
O
=3.5A
=2.5A
=2A
=1A
=3A
V
O
(mV)
-100
100
V
(V)
0
O
Figure 34. Pulse by pulse limiting
Figure 36. Line transient
V
1
2
(V)
30
20
10
CC
Ilim
(A)
5.2
4.8
4.6
4.4
4.2
5
-40 -20
1ms/DIV
current vs.
junction temperature
0
20 40
Typical characteristics
60 80
Vcc=35
I
f
O
sw
= 1A
= 100KHz
100
120
D97IN650
D97IN652
Tj(˚C)
(mV)
-100
100
V
0
O
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