LM2585S-12/NOPB National Semiconductor, LM2585S-12/NOPB Datasheet - Page 19

• Manufacturer Part Number: LM2585S-12/NOPB
• Description: IC MULTI CONFIG 12V 3A TO263-5
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Up (Boost), Flyback, Forward Converterr

Specifications of LM2585S-12/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 12V
• Current - Output: 3A
• Frequency - Switching: 100kHz
• Voltage - Input: 4 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: D²Pak, TO-263 (5 leads + tab)
• Current, Input Bias: 126 nA
• Current, Output: 3 A
• Current, Supply: 11 mA
• Frequency, Oscillator: 100 kHz
• Package Type: TO-263
• Regulation, Line: 20 mV
• Regulation, Load: 20 mV
• Regulator Type: Boost (Step-Up)
• Resistance, Thermal, Junction To Case: 2 °C/W
• Temperature, Operating, Range: -40 to +125 °C
• Transconductance: 0.328
• Voltage, Gain: 70 V/V
• Voltage, Input: 4 to 40 V
• Voltage, Output: 12 V
• Primary Input Voltage: 5V
• No. Of Outputs: 1
• Output Voltage: 12V
• Output Current: 3A
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 3 - 168 Hours
• Filter Terminals: SMD
• Rohs Compliant: Yes
• For Use With: 551011367-061 - BOARD WEBENCH LM2577,LM2585/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device
• Other names: *LM2585S-12; *LM2585S-12/NOPB; LM2585S-12

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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
19
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