CM2576 Datasheet PDF - Champion

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CM2576
Champion

Part Number CM2576
Description 3A STEP DOWN VOLTAGE REGULATOR
Page 12 Pages


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CM2576
3A STEP DOWN VOLTAGE REGULATOR
GENERAL DESCRIPTION
FEATURES
The CM2576 series are step-down switching regulators with
all required active functions. It is capable of driving 3A load
with excellent line and load regulations. These devices are
available in fixed output voltages of 3.3V, 5V, and an
adjustable output version.
The CM2576 series offers a high-efficiency replacement for
popular three-terminal linear regulators. Also it requires a
minimum number of external components. It substantially not
only reduces the area of board size but also the size of the
heat sink, and in some cases no heat sink is required.
Guaranteed 3A output current
3.3V, 5V, and adjustable versions
Wide input voltage range, up to 40V
Internal oscillator of 52KHz fixed frequency
Wide adjustable version output voltage range, from
1.23V to 37V±4% max over line and load conditions
Low standby current, typ. 70µA, at shutdown mode
Requires only 4 external components
Thermal shutdown and current limit protection
P+ product enhancement tested
±4% tolerance on output voltage within specified input
voltages and output load conditions is guaranteed. Also, the
oscillator frequency accuracy is within ±10%. External
shutdown is included, featuring 70µA (typical) standby current.
The output switch includes cycle-by-cycle current limiting, as
well as thermal shutdown for full protection under fault
conditions.
APPLICATIONS
LCD Monitors
ADD-ON Cards Switching Regulators
High Efficiency Step-Down Regulators
Efficient Pre-regulator for Linear Regulators
ORDERING INFORMATION
Package Type
TO-220
TO-263
CM2576SCN220
CM2576SCN263
CM2576ZJCN220
CM2576ZJCN263
CM2576CN220
CM2576CN263
CM2576GSCN220*
CM2576GSCN263*
CM2576GZJCN220*
CM2576GZJCN263*
CM2576GCN220*
CM2576GCN263*
*Note: Add suffix “G” for Pb Free Product
Temperature Range
-40~ +125
-40~ +125
-40~ +125
-40~ +125
-40~ +125
-40~ +125
Output Voltage
3.3V
5.0V
ADJ.
3.3V
5.0V
ADJ.
2004/10/13 Rev. 1.2
Champion Microelectronic Corporation
Page 1



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PIN CONFIGURATION
TO-220
Top View
CM2576
3A STEP DOWN VOLTAGE REGULATOR
TO-263
Top View
ENABLE
FB
GND
VOUT
VIN
5
4
3
2
1
12 3 4 5
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VPOWER) …….………………………………………….……. +45V
ENABLE Pin Input Voltage ….…………………………………. –0.3V VVIN
Operating Junction Temperature Range, TJ ……………...… 0to +150
Storage Temperature ………………………………….….…... -65to +150
Lead Temperature (10 sec.) ……..……………………..….…………….... 260
POWER DISSIPATION TABLE
Package
TO-220
ΘJA (/W)
45
Derating factor (mW/)
TA >= 25
22.2
TA <= 25
Power rating (mW)
2775
TA = 70
TA = 85
Power rating (mW) Power rating (mW)
1776
1443
TO-263
45
22.2
2775
1776
1443
Note:
1. ΘJA : Thermal Resistance-Junction to Ambient, DF: Derating factor, PO: Power consumption.
Junction Temperature Calculation: TJ = TA + (PD x ΘJA ), PO = DF x (TJ – TA)
The ΘJA numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
2. ΘJT : Thermal Resistance-Junction to Ambient, TC: case (Tab) temperature, TJ = TC + (PD x ΘJA )
RESOMMENDED OPERATING CONDITIONS
Input Voltage (VIN)
Temperature Range
Parameter
Symbol
VIN
TJ
Min.
-40
Typ.
Max Units
40 V
125
2004/10/13 Rev. 1.2
Champion Microelectronic Corporation
Page 2



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CM2576
3A STEP DOWN VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0mA, and TJ = +25; unless otherwise noted
Parameter
Device
Test Conditions
Output Voltage
(Note 1)
Output Voltage
(Note 1)
Output Voltage
(Note 1)
CM2576S
CM2576ZJ
CM2576S
CM2576ZJ
CM2576S
CM2576ZJ
Feedback Voltage
(Note 1)
Feedback Voltage
(Note 1)
Feedback Voltage
(Note 1)
Efficiency
CM2576 (Adj)
CM2576 (Adj)
CM2576 (Adj)
CM2576S
CM2576ZJ
CM2576(adj)
Oscillator Frequency
Quiescent Current
Standby Current
Saturation Voltage
Feedback Bias Current
Duty Cycle (ON)
Current Limit
Output Leakage Current
ENABLE Threshold Voltage
ENABLE Input Current
Test circuit of Figure 1
6V<=VIN <=40V
8V<=VIN <=40V
6V<=VIN <=40V
8V<=VIN <=40V
0.5A<=ILOAD <=3A
0.5A<=ILOAD <=3A,
-40<=TJ<=125
Test circuit of Figure 1
Test circuit of Figure 2
VOUT =5V
8V<=VIN <=40V, VOUT =5V
Test circuit of Figure 2
8V<=VIN <=40V, VOUT =5V
Test circuit of Figure 2
0.5A<=ILOAD <=3A
0.5A<=ILOAD <=3A,
-40<=TJ<=125
ILOAD =3A
ILOAD =3A, VOUT =5V
Note 2
TJ=25
-40<=TJ<=125
Note 3
ENABLE = 5V
ILOAD =3A (Note 4)
TJ=25
-40<=TJ<=125
VOUT =5V
(Adj. Version only)
TJ=25
-40<=TJ<=125
Note 5
Note 2,4
TJ=25
-40<=TJ<=125
Note 3
VOUT =0V
VOUT =-1V
VIH (VOUT =0V)
TJ=25
-40<=TJ<=125
VIL (VOUT = Normal Output
TJ=25
Voltage)
-40<=TJ<=125
IIH (ENABLE = 5V)
IIH (ENABLE = 0V)
Min.
3.234
4.900
3.168
4.800
3.135
CM2576
Typ.
3.300
5.000
3.300
5.000
3.300
Max.
3.366
5.100
3.432
5.200
3.482
4.750 5.000 5.250
1.217 1.230 1.243
1.193 1.230 1.267
1.180
47
42
93
4.2
3.5
2.2
2.4
1.230
75
77
77
52
52
5
70
1.4
50
98
7
7.2
0.3
9
1.4
1.2
12
0
1.286
58
63
10
200
1.8
2.0
100
500
8.8
9.0
2
20
1.0
0.8
30
10
Unit
V
V
V
V
V
V
V
V
V
%
%
kHz
mA
µA
V
nA
%
A
mA
V
V
µA
2004/10/13 Rev. 1.2
Champion Microelectronic Corporation
Page 3



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CM2576
3A STEP DOWN VOLTAGE REGULATOR
Note 1: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system
performance. Refer to Application Information for details.
Note 2: The oscillator frequency reduces to approximately 11KHz in the event of fault conditions, such as output short or
overload. And the regulated output voltage will drop approximately 40% from the nominal output voltage. This self-protection
feature lowers the average power dissipation by lowering the minimum duty cycle from 5% down to approximately 2%.
Note 3: For these parameters, FB is removed from VOUT and connected to +12V to force the output transistor OFF.
Note 4: VOUT pin sourcing current. No diode, inductor or capacitor connect to VOUT.
Note 5: FB is removed from VOUT and connected to 0V.
BLOCK DIAGRAM
2004/10/13 Rev. 1.2
Champion Microelectronic Corporation
Page 4



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