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| Número de pieza | PL2576-xxxF5 | |
| Descripción | Simple Switcher 3A Step- Down Voltage Regulator | |
| Fabricantes | Cystech Electonics | |
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CYStech Electronics Corp. Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
Page No. : 1/10
Simple Switcher
3A Step- Down Voltage Regulator
PL2576-XXXF5
Features
3.3V, 5V, 12V, 15V, and adjustable output versions.
Adjustable version output voltage range, 1.23V to 37V±4% max over line
and load conditions.
Guaranteed 3A output current.
Wide input voltage range.
Requires only 4 external components
52 kHz fixed frequency oscillator
TTL shutdown capability, low power standby mode.
High efficiency
Uses readily available standard inductors.
Thermal shutdown and current limit protection.
TO-263-5L
Description
The PL2576-XXXF5 series of regulators are monolithic integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal
frequency compensation and a fixed-frequency oscillator.
The PL2576-XXXF5 series offers a high-efficiency replacement for popular three-terminal linear regulators. It
substantially reduces the size of the heat sink, and in some cases no heat sink is required.
A standard series if inductors optimized for use with the PL2576 are available from several different
manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output
load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50µA (typical)
standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
Applications
Simple high-efficiency step-down (buck) regulator.
Efficient pre-regulator for linear regulators.
On-card switching regulators.
Positive to negative converter (Buck-Boost).
PL2576-XXXF5
CYStek Product Specification
1 page  
CYStech Electronics Corp. Spec. No. : C543F5
Issued Date : 2004.02.27
Revised Date :
Page No. : 5/10
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full
operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V, 5.0V, and adjustable versions,
VIN=25V for the 12V version, and VIN=30V for the 15V version. ILOAD=500mA.
Symbol
Parameter
Conditions
Typ
Ib
fO
VSAT
DC
ICL
IL
IQ
ISTBY
Feedback bias current VOUT=5V (adjustable version only)
Oscillator frequency (Note 8)
Saturation voltage
IOUT=3A (Note 4)
Maximum duty cycle (Note 5)
(ON)
Current limit
(Notes 4, 8)
Output leakage current
(Notes 6, 7)
Output = 0V
Output = -1V
Quiescent current
(Note 6)
Standby quiescent
current
ON/OFF pin=5V (OFF)
50
52
1.4
98
5.8
-
7.5
5
50
ON/OFF Control
VIH
VIL
ON/OFF pin logic
input level
IIH ON/OFF pin input
IIL current
VOUT=0V
VOUT=Nominal output voltage
ON/OFF pin=5V (OFF)
ON/OFF pin=0V (ON)
1.4
1.2
12
0
Min
-
47/42
-
93
4.2/3.5
-
-
-
-
2.2/2.4
-
-
-
Max
100/500
58/63
1.8/2.0
-
6.9/7.5
2
30
10
200
Units
nA
kHz
V
%
A
mA
mA
µA
-
1.0/0.8
30
10
V
V
µA
µA
Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate
conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed
specifications and test conditions, see the Electrical Characteristics.
Note 2 : All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face).
Note 3 : External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
system performance. When the PL2576 is used as shown in the figure 2 test circuit, system performance will be as shown in
system parameters section of Electrical Characteristics.
Note 4 : Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5 : Feedback pin removed from output and connected to 0V.
Note 6 : Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for
the 12V and 15V versions, to force the output transistor OFF.
Note 7 : VIN=40V.
Note 8 : 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 the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
PL2576-XXXF5
CYStek Product Specification
5 Page | ||
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