ETC N2576G

52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
NIKO-SEM
N2576G
TO-263, TO220
GENERAL DESCRIPTION
FEATURES
The N2576 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 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.
z Pin compatible with industry products of
LM2576 Series
z Adjustable output versions
z Wide output voltage range, 1.23V to 27V
for adjustable output version
z DC-to-DC buck converter requiring only 4
external parts
z 52 KHz fixed frequency internal oscillator
z TTL shutdown capability, low power stand
-by mode
z High efficiency
z Uses readily available standard inductors
APPLICATIONS
z Simple high-efficiency step-down (buck)
regulator
z Positive to negative converter (Inverting
Buck-Boost)
z Isolated Fly back Converter using minimum number of external parts
z Powering portable instrument, Set-Top
Box, LCD Monitor, Scanner, I.A, Easy PC
z SMPS Post-Regulator
TYPICAL APPLICATION
8V - 27V
Unregulated
1
DC Input
+Vin
3
Gnd
Cin
100uF
4
N2576
2
Feedback
Output
5
On/Of f
+5V, 3A
Regulated
Output
L1
100uH
+
D1
1N5822
R1
6.18K
+
Cout
1000uF
R2
2K
* VOUT = 1.23V ( 1 + R1 / R2)
Adjustable Regulator in Fixed Output Application
1
MAY-03-2004
N2576G
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
NIKO-SEM
TO-263, TO220
ABSOLUTE MAXIMUM RATINGS
z Maximum Supply Voltage
z Thermal Resistance
Junction to Ambient, θJA
TO-220
TO-263
z Operating Junction
Temperature Range
z Storage Temperature
Range
z Lead Temperature
(Soldering, 10 Seconds)
30V
z ON/OFF Pin Input Voltage
-0.3≤V≤+VI
z Output Voltage to Ground
(Stead State)
-1V
Internally
Limited
z Power Dissipation
z Thermal Resistance
Junction to Case, θJC
2.0°C/W
50°C/W
60°C/W
-40 to 125°C
-65 to 150°C
260°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25°C.)
Parameter
Symbol
Test Conditions
Typical
Limits
Feedback Voltage
VOUT
VIN = 12V, VOUT = 5V
ILOAD = 0.5A (N2576)
1.230V
Feedback Voltage
VOUT
8V ≤ VIN ≤ 27V
0.5A ≤ ILOAD ≤ 3A (N2576)
1.217VMin
1.243VMax
1.230V
1.193VMin
1.267VMax
Efficiency
Feedback Bias
Current
Oscillator
Frequency
Saturation Voltage
η
VIN = 12V, VOUT = 5V
IOUT = 3A (N2576)
77%
IB
VOUT = 5V
50nA
47 KHz (Min)
58 KHz (Max)
1.8VMax
52 KHz
FOSC
Current Limit
ICL
ON/OFF Pin Logic
Input Level
ON/OFF Pin Logic
Input Current
100nA
VSAT
IOUT = 3A (N2576)
1.4V
VIH
VIL
IIH
IIL
N2576
VOUT = 0V
VOUT = Nominal Output Voltage
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 0V (ON)
6.0A
1.4V
1.2V
12µA
0µA
4.0A ~ 7.0A
2.2V (Min)
1.0V (Max)
30µA (Max)
10µA (Max)
REMARK: Orders for parts with Lead-Free plating can be placed using the N2576XG-XX parts name.
DEVICE SELECTION GUIDE
Device
N2576SG
Voltage (V)
ADJ
N2576SG-3.3 N2576SG-5
3.3
5
N2576TG-3.3 N2576TG-5
ADJ
3.3
5
TO-220
TO-220
TO-220
3
Current (A)
Package
N2576TG
TO-263
TO-263
TO-263
2
MAY-03-2004
NIKO-SEM
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
N2576G
TO-263, TO220
PIN CONFIGURATIONS
5 -LEAD TO-220 (T)
Ground
5 - On/Off
4 - Feedback
3 - Ground
2 - Output
1 - Vin
5 -LEAD TO-263 (S)
Ground
5 - On/Off
4 - Feedback
3 - Ground
2 - Output
1 - Vin
3
MAY-03-2004
NIKO-SEM
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
N2576G
TO-263, TO220
TO-220 (5-Lead) MECHANICAL DATA
Dimension
mm
Dimension
Min.
Typ.
Max.
A
9.78
10.16
10.54
H
B
2.61
2.74
2.87
I
C
mm
Min.
Typ.
Max.
1.57
1.7
1.83
6.81
J
4.4
4.6
4.8
D
28.5
28.9
29.3
K
1.14
1.27
1.4
E
14.6
15.0
15.4
L
2.3
2.6
2.9
F
8.4
8.8
9.2
M
0.26
0.46
0.66
G
0.73
0.83
0.93
N
4
7°
MAY-03-2004
NIKO-SEM
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR)
N2576G
TO-263, TO220
TO-263 (D2PAK, 5-Lead) MECHANICAL DATA
Dimension
mm
Min.
Typ.
Dimension
Max.
mm
Min.
Typ.
Max.
A
15.11
15.47
H
1.0
1.4
B
4.0
4.8
I
9.78
10.54
C
1.142
1.4
J
6.6
7.11
D
2.8
K
1.5
E
0.356
0.639
L
0.762
1.01
F
-0.102
0.203
M
0.98
1.05
G
8.636
9.65
N
9
5
MAY-03-2004