L4973D5.1 STMicroelectronics, L4973D5.1 Datasheet - Page 18

• Manufacturer Part Number: L4973D5.1
• Description: IC REG SW 3.5A STEPDOWN 20-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D5.1

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5.1V, 5.1 ~ 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 %
• Current, Input Bias: 2 μA
• Current, Output: 300 μA
• Current, Supply: 2.7 mA
• Frequency, Oscillator: 100 kHz
• Package Type: SO-20
• Power Dissipation: 4 W
• Regulation, Line: 5 mV
• Regulation, Load: 2 mV
• Regulator Type: Switching
• Temperature, Operating, Range: -40 to +150 °C
• Transconductance: 2.5
• Voltage, Gain: 60 dB
• Voltage, Input: 55 V
• Voltage, Output: 5.1 V
• Voltage, Output, High: 3 V
• Voltage, Output, Low: 0.8 V
• Voltage, Supply: 24 V
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-1412-5

Typical characteristics
18/28
Figure 29. Efficiency vs. output current
Figure 31. Efficiency vs. output current
(%)
(%)
90
85
80
75
90
85
80
75
70
η
η
0
0
0.5
Vcc=12V
(see
(see
Vcc=24V
1
1
Figure
Vcc=48V
Figure
1.5
Vcc=24V
Vcc=12V
Vcc=48V
2
2
7)
8)
2.5
V
f
V
f
sw
sw
O
O
= 3.3V
= 200KHz
= 200KHz
= 5.1V
3
3
D97IN646
D97IN662
3.5
I
I
O
O
(A)
(A)
Figure 30. Efficiency vs. output current
Figure 32. Power dissipation vs. input
Pdiss
(%)
(W)
1.5
1.0
0.5
90
85
80
75
η
0
0
0
10
(see
voltage (device only)
(see
1
I
O
=2.5A
20
Vcc=24V
Figure
Figure
I
O
=3A
Vcc=12V
Vcc=48V
I
O
I
O
=3.5A
30
=2A
2
8)
7)
40
V
f
sw
O
V
f
sw
= 3.3V
= 100KHz
O
3
= 5.1V
= 100KHz
50
D97IN647A
D97IN644
Vcc(V)
I
O
(A)
L4973