UNISONIC TECHNOLOGIES CO., LTD
P2576
3A STEP-DOWN VOLTAGE
SWITCHING REGULATOR
1
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
TO-220B
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-220-5
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
Package
TO-220-5
TO-220B
TO-263-5
TO-263-5
SOP-8
HSOP-8
Packing
Tube
Tube
Tape Reel
Tube
Tape Reel
Tape Reel
Lead Free
Halogen Free
P2576L-xx-TA5-T
P2576G-xx-TA5-T
P2576L-xx-TB5-T
P2576G-xx-TB5-T
P2576L-xx-TQ5-R
P2576G-xx-TQ5-R
P2576L-xx-TQ5-T
P2576G-xx-TQ5-T
-
P2576G-xx-S08-R
-
P2576G-xx-SH2-R
Note: xx: Output Voltage, refer to Marking Information.
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Copyright © 2015 Unisonic Technologies Co., Ltd
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QW-R101-025.K
P2576
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
LINEAR INTEGRATED CIRCUIT
MARKING
TO-220B
TO-220-5
TO-263-5
50:5.0V
12:12V
AD:ADJ
SOP-8
HSOP-8
PIN CONFIGURATION of SOP-8/HSOP-8
V
IN
V
OUT
FB
ON/OFF
1
2
3
4
8
7
6
5
GND
GND
GND
GND
V
IN
V
OUT
FB
ON/OFF
1
2
8
7
GND
GND
GND
GND
GND
3
4
6
5
SOP-8
HSOP-8
PIN DESCRIPTIONS
PIN DESCRIPTION
Input voltage
Output voltage
Feed back.
ON / OFF
select pin, when connected to the ground the chip in operating normally.
FOR SOP-8/HSOP-8
PIN NO.
PIN NAME
1
V
IN
2
V
OUT
3
FB
4
5,6,7,8
ON / OFF
GND
Ground
PIN DESCRIPTION
FOR TO-220B/TO-220-5/TO-263-5
PIN NO.
PIN NAME
1
V
IN
Input voltage
2
V
OUT
Output voltage
3
GND
Ground
4
FB
Feed back.
5
ON / OFF
ON / OFF
select pin, when connected to the ground the chip in operating normally.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R101-025.K
P2576
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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QW-R101-025.K
P2576
PARAMETER
Supply Voltage
Maximum Supply Voltage
ON / OFF
Pin Input Voltage
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(T
A
=25°C, unless otherwise specified)
SYMBOL
V
CC
V
CC(MAX)
V
ON/OFF
RATINGS
40
45
-0.3 ~ V
IN
UNITS
V
V
V
Output Voltage to Ground (Steady State)
V
OUT
-1.0
V
Power Dissipation
P
D
Internally Limited
mW
Junction Temperature
T
J
+150
°C
Operating Temperature
T
OPR
-40 ~ +125
°C
Storage Temperature
T
STG
-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
PARAMETER
SYMBOL
5.0V
12V
5.0V
12V
V
OUT
η
TEST CONDITIONS
8V≤V
IN
≤40V,
0.5A≤I
LOAD
≤3A
15V≤V
IN
≤40V,
0.5A≤I
LOAD
≤3A
V
IN
=12V, I
LOAD
=3A
V
IN
=15V, I
LOAD
=3A
V
IN
=12V, I
LOAD
=0.5A, V
OUT
=5V
8V≤V
IN
≤40V,
0.5A≤I
LOAD
≤3.0A,
V
OUT
=5V
V
IN
= 12 V, I
LOAD
=3.0 A, V
OUT
=5V
(Note 4)
I
OUT
=3A (Note 1)
(Note 2)
(Note 1, 4)
V
IN
=40V, Output=-1V (Notes 3)
Output=-1V
(Note 3)
ON / OFF
Pin=5V (OFF)
(T
J
=25°C, When V
OUT
= 5V & ADJ, V
IN
= 12V；V
OUT
= 12V, V
IN
= 15V, I
LOAD
=500mA, unless otherwise specified)
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
V
FB
η
f
OSC
V
SAT
DC
I
LIMIT
I
I(LEAK)
IQ
I
STBY
V
IH
V
IL
I
IΗ
I
IL
1.217 1.23 1.243
1.193 1.23 1.267
77
42
93
4.2
52
1.4
98
5.8
7.5
5
50
2.2
1.0
12
0
30
10
63
1.8
6.9
2
30
10
200
V
V
%
kHz
V
%
A
mA
mA
mA
μA
V
V
μA
μA
MIN TYP MAX UNIT
4.8
5.0
5.2
V
11.52 12.0 12.48 V
77
%
88
%
V
OUT
=0V
V
OUT
=Nominal Output Voltage
ON / OFF
Pin=5V (OFF)
ON / OFF
Pin=5V (ON)
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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QW-R101-025.K
P2576
APPLICATION CIRCUIT
LINEAR INTEGRATED CIRCUIT
Feedback
DC Input
V
IN
P2576
Output
100μH
L
1
+5V
3A Load
GND
ON/OFF
+
C
I
100μF
+
D
1
1N5822
C
O
680μF
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R101-025.K
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