L4973D5.1 STMicroelectronics, L4973D5.1 Datasheet - Page 17

• 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

L4973
Figure 25. Dropout voltage between pin
Figure 27. Efficiency vs. output voltage
(%)
0.6
0.4
0.2
ΔV
(V)
98
96
94
92
90
88
86
0
η
0
0
5
7,8 and 2,3
(Diode STPS745D)
1
10
100KHz
15
200KHz
2
20
Tj=125˚C
I
V
O
25
CC
= 3A
Tj=0˚C
3
= 35V
30
D97IN643
D97IN642
V
I
O
O
(A)
(V)
Figure 26. Efficiency vs. output voltage
Figure 28. Efficiency vs. output current
(%)
(%)
98
96
94
92
90
88
86
95
90
85
80
η
η
0
0
(see
(see
10
Vcc=24V
1
Vcc=12V
Figure
Figure
Vcc=48V
100KHz
200KHz
20
Typical characteristics
2
4)
7)
30
V
f
sw
O
I
V
O
CC
= 100KHz
= 5.1V
= 3A
3
= 50V
D97IN641
D97IN645
40
V
I
O
O
(A)
(V)
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