LM2585S-ADJ/NOPB National Semiconductor, LM2585S-ADJ/NOPB Datasheet - Page 18

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

Specifications of LM2585S-ADJ/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adjustable
• 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: 3.2
• Voltage, Gain: 670 V/V
• Voltage, Input: 4 to 40 V
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Voltage: 37V
• 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-ADJ; *LM2585S-ADJ/NOPB; LM2585S-ADJ

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FIGURE 23. Pulse PE-68413
FIGURE 24. Renco RL-5751
FIGURE 25. Renco RL-5533
FIGURE 26. Renco RL-5532
(Surface Mount)
Top View
Top View
Top View
Top View
T5
T7
T6
T5
1251543
1251540
1251542
1251539
18
Step-Up (Boost) Regulator
Operation
Figure 30
ulator. This is a switching regulator that produces an output
voltage greater than the input supply voltage.
A brief explanation of how the LM2585 Boost Regulator works
is as follows (refer to
on, the inductor current ramps up at the rate of V
energy in the inductor. When the switch turns off, the lower
end of the inductor flies above V
through diode (D) into the output capacitor (C
(V
switch on time is transferred to the output during the switch
off time. The output voltage is controlled by adjusting the peak
switch current, as described in the flyback regulator section.
OUT
− V
IN
shows the LM2585 used as a step-up (boost) reg-
)/L. Thus, energy stored in the inductor during the
FIGURE 28. Schott 67140900
FIGURE 29. Schott 67140890
FIGURE 27. Top View
Figure
Schott 26606
Top View
Top View
30). When the NPN switch turns
T7
T6
T5
IN
, discharging its current
OUT
1251546
) at a rate of
IN
1251547
/L, storing
1251544