1
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
N2576G-3.3
TO-220, TO263
Lead-Free
Feb-02-2005
NIKO-SEM
GENERAL DESCRIPTION
The N2576G Series switching voltage
regulators (SVR) are monolithic integrated
circuits that provide all the active functions
for a step-down (buck) switching regulator,
Both series are capable of driving
3 A load respectively with excellent line and
load regulation.
The
N2576G
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 N2576G 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
l Pin compatible with industry products of
LM2576G Series
l Fixed 3.3V output version
l Wide output voltage range, 1.23V to 27V
for adjustable output version
l DC-to-DC buck converter requiring only 4
external parts
l 52 KHz fixed frequency internal oscillator
l TTL shutdown capability, low power stand
-by mode
l High efficiency
l Uses readily available standard inductors
APPLICATIONS
l Simple high-efficiency step-down (buck)
regulator
l Positive to negative converter (Inverting
Buck-Boost)
l Isolated Fly back Converter using mini-
mum number of external parts
l Powering portable instrument, Set-Top
Box, LCD Monitor, Scanner, I.A, Easy PC
l SMPS Post-Regulator
TYPICAL APPLICATION
DC Input
3
Feedback
N2576
+3.3V,3A
Cin
100uF
Regulated
D1
1N5822
4
Output
8V - 27V
Unregulated
Cout
1000uF
2
L1
100uH
Output
1
Gnd
5
+Vin
On/Off