L5981 STMicroelectronics, L5981 Datasheet - Page 31

• Manufacturer Part Number: L5981
• Description: IC REG SW STEP DOWN 1A 8-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5981

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 18 V
• Current - Output: 1A
• Frequency - Switching: 250kHz ~ 1MHz
• Voltage - Input: 2.9 ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, 8-VFQFPN
• Power - Output: 1.5W
• Output Voltage: 3 V
• Output Current: 1 A
• Input Voltage: 2.9 V to 18 V
• Switching Frequency: 220 KHz to 275 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Low Dropout Operation: 100 % duty cycle
• For Use With: 497-6385 - BOARD EVAL FOR L5981
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5981
Figure 22. Junction temperature vs output
Figure 24. Junction temperature vs output
Figure 26. Efficiency vs output current
94
92
90
88
86
84
82
80
78
76
0.1
0.2
current
current
0.3
VCC=5V
F
SW
0.4
=250KHz
0.5
Io [A]
0.6
0.7
Vo=3.3V
Vo=2.5V
Vo=1.8V
0.8
0.9
Doc ID 13004 Rev 6
1
Figure 23. Junction temperature vs output
Figure 25. Efficiency vs output current
Figure 27. Efficiency vs output current
95
90
85
80
75
70
95
90
85
80
75
70
65
0.1
0.1
0.2
0.2
current
0.3
0.3
VCC=12V
F
VCC=3.3V
F
SW
SW
=250KHz
0.4
0.4
=250KHz
0.5
0.5
Io [A]
Io [A]
Application information
0.6
0.6
0.7
0.7
Vo=2.5V
0.8
Vo=1.8V
Vo=1.2V
0.8
Vo=3.3V
Vo=2.5V
Vo=5.0V
0.9
0.9
1.0
1
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