UTC-IC P2576

UNISONIC TECHNOLOGIES CO., LTD
P2576
LINEAR INTEGRATED CIRCUIT
3A STEP-DOWN VOLTAGE
SWITCHING REGULATOR
1
„
TO-220B
DESCRIPTION
As a step-down (buck) switching regulator, the UTC P2576
provides drives 3A load. The UTC P2576 are simple because it
only needs to use a minimum number of external components.
Frequency compensation and a fixes-frequency oscillator are
in it. UTC P2576 can perform with standard inductors, and
simplifying the switch mode power supplies’ design. UTC P2576
guarantees output load conditions and ±10% on the oscillator
frequency. Its external shutdown is included with 50μA standby
current. As well as thermal shutdown for full protection under fault
conditions, the output switch has cycle by cycle current limiting.
„
1
TO-252-5
1
TO-263-5
FEATURES
SOP-8
* Output Current 3A
* Input Voltage Range from 7V to 40V
* Requires 4 External Components
* Very High Efficiency
* TTL Shutdown
* Low Power Standby Mode
* Thermal Shutdown,
* Current Limit Protection
* Internal Oscillator: 52 kHz Fixed Frequency
„
HSOP-8
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
P2576L-xx-TB5-T
P2576G-xx-TB5-T
P2576L-xx-TN5-R
P2576G-xx-TN5-R
P2576L-xx-TQ5-R
P2576G-xx-TQ5-R
P2576L-xx-TQ5-T
P2576G-xx-TQ5-T
P2576L-xx-S08-R
P2576G-xx-S08-R
P2576L-xx-SH2-R
P2576G-xx-SH2-R
Note: xx: Output Voltage, refer to Marking Information.
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Copyright © 2011 Unisonic Technologies Co., Ltd
Package
Packing
TO-220B
TO-252-5
TO-263-5
TO-263-5
SOP-8
HSOP-8
Tube
Tape Reel
Tape Reel
Tube
Tape Reel
Tape Reel
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P2576
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„
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LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION of SOP-8/HSOP-8
VIN
1
8
GND
VOUT
2
7
GND
FB
3
6
GND
ON/OFF
4
5
GND
PIN DESCRIPTIONS
PIN NO.
1
2
3
PIN NAME
VIN
VOUT
FB
4
ON / OFF
5,6,7,8
GND
PIN DESCRIPTION
Input voltage
Output voltage
Feed back.
ON / OFF select pin, when connected to the ground the chip in operating normally.
Ground
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
TO-220B
TO-252-5
TO-263-5
50:5.0V
AD:ADJ
UNISONIC TECHNOLOGIES CO., LTD
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MARKING
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P2576
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LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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P2576
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise specified)
PARAMETER
Supply Voltage
Maximum Supply Voltage
SYMBOL
VCC
VCC(MAX)
RATINGS
40
45
-0.3 ~ VIN
UNITS
V
V
VON/OFF
V
ON / OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
VOUT
-1.0
V
Power Dissipation
PD
Internally Limited
mW
Junction Temperature
TJ
+150
°C
Operating Temperature
TOPR
-40 ~ +125
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
„
ELECTRICAL CHARACTERISTICS (TJ=25°C, VIN=12V, ILOAD=500mA.)
PARAMETER
P2576 - 5.0V
SYMBOL
Feedback Voltage
Efficiency
P2576 - ADJ
Feedback Voltage
Efficiency
ALL OUTPUT VOLTAGE
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
ON/OFF Pin Logic Input Level
ON/OFF Pin Input Current
VOUT
η
VFB
η
fOSC
VSAT
DC
ILIMIT
II(LEAK)
IQ
ISTBY
TEST CONDITIONS
VIN=12V, ILOAD=0.5A
8V≤VIN≤40V, 0.5A≤ILOAD≤3.0A
VIN = 12 V, ILOAD =3.0 A
MIN
5.100
5.200
V
V
%
VIN=12V, ILOAD=0.5A, VOUT =5V
1.217 1.23 1.243
8V≤VIN≤40V, 0.5A≤ILOAD≤3.0A, VOUT =5V 1.193 1.23 1.267
VIN = 12 V, ILOAD =3.0 A, VOUT =5V
77
V
V
%
(Note 4)
IOUT=3A (Note 1)
(Note 2)
(Note 1, 4)
VIN=40V, Output=-1V (Notes 3)
Output=-1V
(Note 6)
4.900
4.800
TYP MAX UNIT
42
93
4.2
ON / OFF Pin=5V (OFF)
2.2
5.0
5.0
77
52
1.4
98
5.8
63
1.8
7.5
5
6.9
2
30
10
kHz
V
%
A
mA
mA
mA
50
200
μA
1.4
1.2
1.0
V
V
VIH
VIL
VOUT=0V
VOUT=Nominal Output Voltage
IIΗ
ON / OFF Pin=5V (OFF)
12
30
μA
IIL
ON / OFF Pin=5V (ON)
0
10
μA
Notes: 1. Output pin sourcing current. No diode, inductor or capacitor connected to output.
2. Feedback pin removed from output and connected to 0V.
3. Feedback pin removed from output and connected to +12V, to force the output transistor OFF.
4. The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload
which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This
self- protection feature lowers the Average power dissipation of P2576 by lowering the minimum duty cycle
from 5% down to approximately 2%.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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P2576
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LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
Feedback
VIN
DC Input
P2576
100μH
Output
+5V
3A Load
L1
GND
+
CI
100μF
UNISONIC TECHNOLOGIES CO., LTD
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ON/OFF
+
D1
1N5822
CO
680μF
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LINEAR INTEGRATED CIRCUIT
TYPICAL TEST CIRCUIT
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Feedback
VIN
P2576
L1
Output
VOUT
100μH
GND
ON/OFF
VIN
+
Unregulated
DC Input
LOAD
CI
100μF
+
D1
MBR360
CO
680μF
CI : 100μF, 75V
CO : 680μF, 25V
D1 : Schottky, MBR360
L1 : 100μH
R1 : 2K, 0.1%
R2 : 6.12K, 0.1%
Feedback
VIN
VIN
UTC
P2576 - ADJ
Output
L1
VOUT=5.0 V
100μH
GND
+
7V-40V
Unregulated
DC Input
ON/OFF
CIN
100μF
R2
LOAD
D1
MBR360
COUT
680μF
R1
Note:
VOUT = VREF (1 +
R 2 = R1 (
R2
)
R1
VOUT
− 1)
VREF
(Where VREF=1.23V, R1 between 1k and 5k.)
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P2576
TYPICAL APPLICATION CIRCUIT (Ta=25°C, VCC=12V, unless otherwise specified)
Output Current (A)
Saturation Voltage (V)
„
LINEAR INTEGRATED CIRCUIT
Dropout Voltage
VOUT=5V,
Measured at Ground Pin T =25°C
22
1.5
1.0
0.5
20
18
ILOAD=3A
16
14
12
ILOAD=0.2A
10
8
0
-75 -50 -25 0 25 50 75 100 125 150
Junction Temperature (°C)
75
0
20
30
40
Input Voltage (V)
50
60
1
VIN=40V
60
50
ON/OFF PIN:5V
VIN=12V
40
-25
0
25
50
75 100 125
Junction Temperature (°C)
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Output Voltage
Deviation(V)
70
30
-50
10
Load Transient Response
Standby Quiescent Current
0
-1
Load
Current(A)
Standby Quiescent Current (µA)
Quiescent Current
24
Quiescent Current (mA)
Input-Output Differential (V)
2.0
VIN=12V, VOUT=5V@3A
3
0.01
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
Time(ms)
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P2576
TYPICAL APPLICATION CIRCUIT(Cont.)
Quiescent Current vs. Duty Cycle
40.0
37.5
35.0
32.5
30.0
27.5
25.0
22.5
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
VIN=7V
VIN=40V
ILOAD=0.5A
20
15.0
10.0
5.0
0
-5.0
-10.0
-15.0
-20.0
60
40
Duty Cycle (%)
80
100
0
20
60
40
Duty Cycle (%)
80
100
Inductor
Current(A)
Feedback Pin Current (nA)
Output
Voltage(V)
0
Feedback Voltage vs Duty Cycle
20.0
Adjustable Version Only
Feedback Voltage Change (mV)
Quiescent Current (mA)
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LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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