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AE2576 Schematic ( PDF Datasheet ) - Chip-Rail

Teilenummer AE2576
Beschreibung SIMPLE SWITCHER 3A Step-Down Voltage Regulator
Hersteller Chip-Rail
Logo Chip-Rail Logo 




Gesamt 11 Seiten
AE2576 Datasheet, Funktion
AE2576
SIMPLE SWITCHER 3A Step-Down Voltage Regulator
Features
3.3V, 5V, 12V, 15V and adjustable
output versions
Adjustable version output voltage
range, 1.23V to 30V ±4% max over
line and load conditions
Guaranteed 3A output current
Input voltage up to 45V
Requires only 4 external components
Applications
Simple high-efficiency step-down
(buck) regulator
Efficient pre-regulator for linear
General Description
The AE2576 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.
A standard series of inductors optimized
52KHz fixed frequency internal
oscillator
TTL shutdown capability, low power
standby mode
High efficiency
Thermal shutdown and current limit
protection
regulators
Positive to negative converter
(BucK-Boost)
for use with the AE2576 are available from
several different manufacturers. This
feature greatly simplifies the design of
switch-mode power supplies.
Others 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 in 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.
Jan.2010 V1.2
1/11
Free Datasheet http://www.datasheet4u.com/






AE2576 Datasheet, Funktion
AE2576
SIMPLE SWITCHER 3A Step-Down Voltage Regulator
VIL VOUT=Nominal
Output Voltage
ON/OFF
IH Pin Input Pin =5V(OFF)
Current
IL
ON/OFF
Pin =0V(ON)
V
-- 1.36 1.43
-- 12 30 μA
-- 0 10 μA
Note 1: Absolute Maximum Ratings
indicates limits beyond which damage to
the device May occur. Operating Ratings
indicate conditions for which the device is
intended to be functional, but specific
performance is not guaranteed. For
guaranteed specifications and the best
conditions, see the Electrical
Characteristics.
Note 2: All limits guaranteed at room
temperature (standard type face) and at
temperature extremes (bold type face). All
room temperature limits are 100%
production tested.
All limits at
temperature extremes are guaranteed via
correlation using standard Statistical
Quality Control (SQC) methods.
Note 3: External components such as the
catch diode, inductor, input and output
capacitors, and voltage programming
resistors can affect switching regulator
system performance.
Note 4: Output pin sourcing current. No
diode, inductor or capacitor connected to
output pin.
Note 5: Feedback pin removed from
output and connected to 0V.
Note 6: Feedback pin removed from
output and connected to +12V for the 3.3V,
5V, and the ADJ. version, and +25V for
the 12V and 15V version, to force the
output transistor switch OFF.
Note 7: VIN =36V.
Note 8: Junction to ambient thermal
resistance (no external heat sink) for the 5
lead TO-220 package mounted vertically,
with 1/2 inch leads in a socket, or on a PC
board with minimum copper area.
Note 9: Junction to ambient thermal
resistance (no external heat sink) for the 5
lead TO-220 package mounted vertically,
with 1/4 inch leads soldered to a PC board
containing approximately 4spuare inches
of copper area surrounding the leads.
Note 10: If the TO-263 package is used,
the thermal resistance can be reduced by
increasing the PC board copper area
thermally to the package.Using 0.5spuare
inches of copper area θJA 50/W, with
1square inch of copper area, θJA 37
/W, and with 1.6 or more square inches
of copper areaθJA 32/W.
Jan.2010 V1.2
6/11
Free Datasheet http://www.datasheet4u.com/

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