LM2574MX-12 National Semiconductor, LM2574MX-12 Datasheet - Page 10
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LM2574MX-12
Manufacturer Part Number
LM2574MX-12
Description
Conv DC-DC Single Inv/Step Down 4V to 40V 14-Pin SOIC W T/R
Manufacturer
National Semiconductor
Type
Inverting|Step Downr
Datasheet
1.LM2574MX-ADJNOPB.pdf
(24 pages)
Specifications of LM2574MX-12
Package
14SOIC W
Number Of Outputs
1
Minimum Input Voltage
4 V
Maximum Input Voltage
40 V
Switching Frequency
58 KHz
Operating Supply Voltage
40(Max) V
Maximum Output Current
0.5 A
Output Type
Fixed
Output Voltage
12 V
Switching Regulator
Yes
Efficiency
88(Typ) %
Operating Temperature
-40 to 125 °C
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2574MX-12/NOPB
Manufacturer:
NS
Quantity:
16 394
www.national.com
Test Circuit and Layout Guidelines
C
C
D1 — Schottky, 11DQ06
L1 — 330 µH, 52627
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as pos-
sible. Single-point grounding (as indicated) or ground plane
construction should be used for best results. When using the
Adjustable version, physically locate the programming resis-
tors near the regulator, to keep the sensitive feedback wiring
short.
IN
OUT
— 22 µF, 75V
— 220 µF, 25V
Aluminum Electrolytic
Aluminum Electrolytic
(for 5V in, 3.3V out, use
100 µH, RL-1284-100)
Adjustable Output Voltage Version
Fixed Output Voltage Versions
FIGURE 2.
10
DS011394-11
DS011394-12