LM2585S-3.3 National Semiconductor, LM2585S-3.3 Datasheet - Page 19

• Manufacturer Part Number: LM2585S-3.3
• Description: Power Supply IC
• Manufacturer: National Semiconductor

Specifications of LM2585S-3.3

• Output Current: 3A
• Output Voltage: 3.3VDC
• No. Of Pins: 5
• Peak Reflow Compatible (260 C): No
• Termination Type: SMD
• Leaded Process Compatible: No
• Mounting Type: Through Hole
• Package / Case: 5-TO-263
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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By adding a small number of external components (as shown in Figure 30), the LM2585 can be used to produce a regulated output voltage that is greater than
the applied input voltage. The switching waveforms observed during the operation of this circuit are shown in Figure 31. Typical performance of this regulator is
shown in Figure 32.
FIGURE 30. 12V Boost Regulator
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A: Switch Voltage, 10 V/div
B: Switch Current, 2 A/div
C: Inductor Current, 2 A/div
D: Output Ripple Voltage,
100 mV/div, AC-Coupled
Horizontal: 2 μs/div
FIGURE 31. Switching Waveforms
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FIGURE 32. V
Response to Load Current Step
OUT
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