LM2594M-5.0 National Semiconductor, LM2594M-5.0 Datasheet - Page 8

• Manufacturer Part Number: LM2594M-5.0
• Description: IC, STEP-DOWN REGULATOR, 8-SOIC
• Manufacturer: National Semiconductor

Specifications of LM2594M-5.0

• Primary Input Voltage: 12V
• No. Of Outputs: 1
• Output Voltage: 5V
• Output Current: 500mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Supply Voltage Range: 4.5V To 40V
• Termination Type: SMD
• Dc To Dc Converter Type: Inverting/Step Down
• Number Of Outputs: 1
• Pin Count: 8
• Input Voltage: 40V
• Switching Freq: 173kHz
• Efficiency: 82%
• Package Type: SOIC N
• Output Type: Fixed
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 4.5V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Filter Terminals: SMD
• Rohs Compliant: No
• Input Voltage Primary Max: 40V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Typical Circuit and Layout Guidelines
C
C
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 µH, L20
Select components with higher voltage ratings for designs using the LM2594HV with an input voltage between 40V and 60V.
C
C
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 µH, L20
R
C
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance can
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the wires indicated by
heavy lines should be wide printed circuit traces and
should be kept as short as possible. For best results, ex-
ternal components should be located as close to the
switcher lC as possible using ground plane construction or
single point grounding.
IN
OUT
IN
OUT
1
FF
— 1 k , 1%
— 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
— 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
— See Application Information Section
— 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
— 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
FIGURE 1. Typical Circuits and Layout Guides
Adjustable Output Voltage Versions
Fixed Output Voltage Versions
8
If open core inductors are used, special care must be
taken as to the location and positioning of this type of induc-
tor. Allowing the inductor flux to intersect sensitive feedback,
lC groundpath and C
When using the adjustable version, special care must be
taken as to the location of the feedback resistors and the as-
sociated wiring. Physically locate both resistors near the IC,
and route the wiring away from the inductor, especially an
open core type of inductor. (See application section for more
information.)
OUT
wiring can cause problems.
DS012439-23
DS012439-22