LM2585SX-ADJ/NOPB National Semiconductor, LM2585SX-ADJ/NOPB Datasheet - Page 6

• Manufacturer Part Number: LM2585SX-ADJ/NOPB
• Description: IC MULTI CONFIG ADJ 3A TO-263-5
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Up (Boost), Flyback, Forward Converterr

Specifications of LM2585SX-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)
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Voltage: 12.6V
• Output Current: 3A
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Filter Terminals: SMD
• Input Voltage Primary Max: 40V
• Rohs Compliant: Yes
• For Use With: 551011367-061 - BOARD WEBENCH LM2577,LM2585/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2585SX-ADJ; *LM2585SX-ADJ/NOPB; LM2585SX-ADJ

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I
V
V
I
θ
θ
θ
θ
θ
θ
θ
L
CL
JA
JA
JC
JA
JA
JA
JC
Symbol
SUS
SAT
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended
to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the
Electrical Characteristics.
Note 2: Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the LM2585 is used
as a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 3A. However, output current is internally limited when
the LM2585 is used as a flyback regulator (see the Application Hints section for more information).
Note 3: The junction temperature of the device (T
dissipation of the device (P
T
maximum allowable power dissipation, derate the maximum junction temperature—this ensures a margin of safety in the thermal design.
Note 4: External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2585 is used as
shown in Figures
Note 5: All room temperature limits are 100% production tested, and all limits at temperature extremes are guaranteed via correlation using standard Statistical
Quality Control (SQC) methods.
Note 6: A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring A
Note 7: To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error amplifier output
high. Adj: V
Note 8: To measure this parameter, the feedback voltage is set to a high value, depending on the output version of the device, to force the error amplifier output
low. Adj: V
Note 9: To measure the worst-case error amplifier output current, the LM2585 is tested with the feedback voltage set to its low value (specified in
at its high value (specified in
Note 10: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a socket, or on a
PC board with minimum copper area.
Note 11: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads soldered to a PC
board containing approximately 4 square inches of (1oz.) copper area surrounding the leads.
Note 12: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as
the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 13: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area
of the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 14: Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times
the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in
Switchers Made Simple software.
J(MAX)
. For a safe thermal design, check that the maximum power dissipated by the device is less than: P
FB
FB
Switch Leakage
Current
Switch Sustaining
Voltage
Switch Saturation
Voltage
NPN Switch
Current Limit
Thermal Resistance
= 1.41V; 3.3V: V
= 1.05V; 3.3V: V
Figure 2
Parameters
and
D
). A thermal shutdown will occur if the temperature exceeds the maximum junction temperature of the device: P
(Note
FB
FB
Figure 3
= 3.80V; 5.0V: V
= 2.81V; 5.0V: V
8) .
, system performance will be as specified by the system parameters.
Switch Off
V
dV/dT = 1.5V/ns
I
T Package, Junction to Ambient
(Note
T Package, Junction to Ambient
(Note
T Package, Junction to Case
S Package, Junction to Ambient
(Note
S Package, Junction to Ambient
(Note
S Package, Junction to Ambient
(Note
S Package, Junction to Case
SWITCH
SWITCH
J
FB
) is a function of the ambient temperature (T
FB
10)
11)
12)
13)
14)
= 5.75V; 12V: V
= 4.25V; 12V: V
= 3.0A
= 60V
Conditions
FB
FB
= 13.80V.
= 10.20V.
6
Typical
0.45
4.0
15
65
45
56
35
26
2
2
A
), the junction-to-ambient thermal resistance (θ
D
≤
[T
Min
3.0
65
J(MAX)
− T
A(MAX)
)]/θ
JA
300/600
0.65/0.9
. When calculating the
Max
VOL
7.0
.
D
JA
× θ
), and the power
JA
(Note
+ T
A(MAX)
7) and
Units
°C/W
μA
V
V
A
≥