LM2594M-ADJ/NOPB National Semiconductor, LM2594M-ADJ/NOPB Datasheet - Page 25
LM2594M-ADJ/NOPB
Manufacturer Part Number
LM2594M-ADJ/NOPB
Description
IC REG SIMPLE SWITCHER 8-SOIC
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Specifications of LM2594M-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 37 V
Current - Output
500mA
Frequency - Switching
150kHz
Voltage - Input
4.5 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Primary Input Voltage
60V
No. Of Outputs
1
Output Voltage
37V
Output Current
500mA
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Current, Input Bias
10 nA
Current, Output
0.5 A
Current, Supply
5 mA
Frequency, Oscillator
150 kHz
Package Type
SOIC
Regulator Type
Buck (Step-Down)
Temperature, Operating, Range
-40 to +125 °C
Voltage, Input
4.5 to 40 V
Voltage, Output
1.2 to 37 V
Peak Reflow Compatible (260 C)
Yes
Termination Type
SMD
Filter Terminals
SMD
Input Voltage
40V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Other names
*LM2594M-ADJ
LM2594M-ADJ
LM2594M-ADJ
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2594M-ADJ/NOPB
Manufacturer:
National Semiconductor
Quantity:
1 940
Company:
Part Number:
LM2594M-ADJ/NOPB
Manufacturer:
NS/TI
Quantity:
70
Application Information
put reaches its nominal output voltage. The actual time de-
pends on the output voltage and the size of the output
capacitor. Input power sources that are current limited or
sources that can not deliver these currents without getting
loaded down, may not work correctly. Because of the rela-
tively high startup currents required by the inverting topology,
the delayed startup feature (C1, R
25 is recommended. By delaying the regulator startup, the
input capacitor is allowed to charge up to a higher voltage
before the switcher begins operating. A portion of the high in-
put current needed for startup is now supplied by the input
capacitor (C
pacitor can be made much larger than normal.
IN
). For severe start up conditions, the input ca-
FIGURE 28. Inverting Regulator Ground Referenced Shutdown using Opto Device
FIGURE 27. Inverting Regulator Ground Referenced Shutdown
1
and R
(Continued)
2
) shown in Figure
25
INVERTING REGULATOR SHUTDOWN METHODS
To use the ON /OFF pin in a standard buck configuration is
simple, pull it below 1.3V (
turn regulator ON, pull it above 1.3V to shut the regulator
OFF. With the inverting configuration, some level shifting is
required, because the ground pin of the regulator is no
longer at ground, but is now setting at the negative output
voltage level. Two different shutdown methods for inverting
regulators are shown in Figure 27 and Figure 28 .
DS012439-42
@
25˚C, referenced to ground) to
DS012439-43
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