1
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
N2576G-5
TO-220, TO263
Lead-Free
MAY-21-2004
NIKO-SEM
GENERAL DESCRIPTION
The N2576 Series switching vo ltage
regulators (SVR) are monolithic integrated
circuits that provide all the active functions
for a step-down (buck) switching regulator,
B o th se ri e s a r e capab le of d r ivin g
3 A load respectively with excellent line and
load regulation.
The N2576 Series SVR include a switching
regulator and compensation network all
within the same package. Just add a choke,
catch diode and two capacitors to obtain an
efficient DC-to-DC converter. The output
switch includes cycle-by-cycle current limit
-ing, as well as thermal shutdown for full
protection under fault conditions.
The N2576 Series SVR offer replacement
for popular 3 terminal linear regulators by
providing higher efficiency with reduced
heat sink size. In many applications a heat
sink will not be required.
FEATURES
Pin compatible with industry products of
LM2576 Series
Fixed 5V output version
Wide output voltage range, 1.23V to 27V
for adjustable output version
DC-to-DC buck converter requiring only 4
external parts
52 KHz fixed frequency internal oscillator
TTL shutdown capability, low power stand
-by mode
High efficiency
Uses readily available standard inductors
APPLICATIONS
Simple high-efficiency step-down (buck)
regulator
Positive to negative converter (Inverting
Buck-Boost)
Isolated Fly back Converter using mini-
mum number of external parts
Powering portable instrument, Set-Top
Box, LCD Monitor, Scanner, I.A, Easy PC
SMPS Post-Regulator
TYPICAL APPLICATION
L1
Output
+Vin
D1
Gnd
Unregulated
Output
DC Input
N2576
100uH
100uF
On/Off
Cout
3
2
+
5
4
+5V, 3A
1000uF
1N5822
8V - 27V
Cin
1
+
Regulated
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