L5973D STMicroelectronics, L5973D Datasheet - Page 8

• Manufacturer Part Number: L5973D
• Description: IC REG SWITCHING STEPDOWN SOIC-8
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5973D

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 35 V
• Current - Output: 2.5A
• Frequency - Switching: 250kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
• Power - Output: 2.25W
• Output Voltage: 35 V
• Output Current: 2.5 A
• Input Voltage: 4 V to 36 V
• Switching Frequency: 212 KHz to 280 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Current, Input Bias: 2.5 μA
• Current, Output: 300 μA
• Current, Supply: 2.5 mA
• Frequency, Oscillator: 250 kHz
• Package Type: HSOP-8
• Power Dissipation: 2.25 W
• Regulation, Line: 5 mV
• Regulation, Load: 8 mV
• Regulator Type: Low Dropout, Switching
• Temperature, Operating, Range: -40 to +150 °C
• Transconductance: 2.3
• Voltage, Gain: 57 dB
• Voltage, Input: 36 V
• Voltage, Output: 35 V
• Voltage, Output, High: 3.5 V
• Voltage, Output, Low: 0.4 V
• Voltage, Supply: 12 V
• No. Of Pins: 8
• Rohs Compliant: Yes
• Primary Input Voltage: 36V
• No. Of Outputs: 1
• Switching Frequency Max: 250kHz
• Supply Voltage Max: 36V
• Low Dropout Operation: 100 % duty cycle
• For Use With: 497-4134 - EVAL BOARD FOR L5973 SERIES497-4133 - EVAL BOARD FOR L5973 SERIES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical characteristics
8/17
Figure 8.
Figure 10. Efficiency vs output current
Tj(°C)
120
110
100
90
80
70
60
50
40
30
20
95
93
91
89
87
85
83
81
79
77
75
73
71
69
67
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3
Vin=5V
Tamb=25°C
Vin=5V
Vo=1.8V
Junction temperature vs
output current
Vo=2.5V
Vo=3.3V
Io(A)
Io (A)
Vo=3.3V
Vo=1.8V
Vo=2.5V
Figure 9.
Figure 11. Efficiency vs output current
Tj (°C)
120
110
100
90
80
70
60
50
40
30
20
91
89
87
85
83
81
79
77
75
73
71
69
67
65
0.2 0.4 0.6 0.8
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3
Vin=12V
Tamb=25°C
Vin=12V
Junction temperature vs
output current
Vo=2.5V
Vo=3.3V
1
Vo=5V
1.2 1.4 1.6 1.8
Io (A)
Io (A)
2
Vo=5V
2.2 2.4 2.6
Vo=2.5V
L5973D
Vo=3.3V