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AS1582 Datasheet Preview

AS1582 Datasheet

3A Ultra Low Dropout Voltage Regulator

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AS1582
3A Ultra Low Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
FEATURES
Low Dropout Voltage 500mV at 3A Full Load Current
Fixed Output Voltages of 3.3V, 2.8V & 2.5V
Adjustable Output Down to 1.2V from ATX Power Supply
Extremely Tight Voltage and Line Regulation
Standard 5-Terminal Low Cost TO-220 & TO-263
APPLICATIONS
3.3V to 2.8V ATX Power Supplies
3.3V to 2.9V for Portable PENTIUMProcessor
5V to 3.5V VRE Supply
High Efficiency “Green” Computer Systems
PRODUCT DESCRIPTION
The AS1582 is a 3A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only two external
resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does not require any external
resistors. The AS1582 features a low dropout of less than 400mV(typ.) and offers fast transient response. This device is suitable for
Pentium applications requiring 2.8V or 2.5V from 3.3V ATX power supplies, where a low current input voltage 1V greater than
the output voltage is needed. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for
the use in powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V
supplies. The AS1582 is also an excellent choice as a post regulator for switching supplies applications.
The AS1582 offers full protection against over-current faults, reversed input polarity, over temperature operation and positive and
negative transient voltage.
The AS1582 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 7A, 5A and 1.5A
ultra low dropout versions refer to AS1580, AS1581 and AS1583 data sheets respectively.
ORDERING INFORMATION
TO-22O
5-PIN
AS1582U
AS1582U-X
TO-263
5-PIN
AS1582T
AS1582T-X
Consult with factory for other fixed output voltages.
X= Output Voltage (3.3V, 2.8V or 2.5V)
OUTPUT
Adjustable
Fixed
PIN CONNECTIONS
TO-263-5 (T)
AS1582
12 345
Top View
1. SENSE
2. ADJ or FIXED
3. VOUT
4. VCTRL
5. VIN
TO-220-5 (U)
AS1582
1 2 3 45
1. SENSE
2. ADJ or FIXED
3. VOUT
4. VCTRL
5. VIN
Front View
Rev. 10/2/00




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AS1582 Datasheet Preview

AS1582 Datasheet

3A Ultra Low Dropout Voltage Regulator

No Preview Available !

AS1582
ABSOLUTE MAXIMUM RATINGS
Power Dissipation.................................................... Internally Limited
Lead Temp (soldering, 10 seconds)........................................... 300°C
Storage Temperature Range ...................................... -65ºC to +150ºC
Operating Junction Temperature Range
AS1582 Control Section................................................0ºC to +125ºC
AS1582 Power Transistor .............................................0ºC to +150ºC
Input Supply Voltage ..........................................................6V
VCTRL Input Voltage ..........................................................13V
ELECTRICAL CHARACTERISTICS at VS =14V, Ta=25°C, Io=10mA, C2=100µF, unless otherwise specified. (Note 1)
(Boldface applies over full temperature range).
Parameters
2.5V Version
Conditions
AS1582
Min Typ Max
Units
Output Voltage
2.8V Version
Output Voltage
3.3V Version
Output Voltage
All Voltage Options
Reference Voltage
Line Regulation
Load Regulation (Note1)
VCTRL=6.0V to 12V, VIN=3.0V to 5.0V, IO=10mA
IO=10mA to
3A
VCTRL=6.3V to 12V, VIN=3.3V to 12V, IO=10mA
IO=10mA to
3A
VCTRL=6.3V to 12V, VIN=3.3V to 12V, IO=10mA
IO=10mA to 3A
VCTRL=2.75V, VIN=2.00V, IO=10mA
VCTRL=2.7V to 12V, VIN=2.05V to 5.5V, IO=10mA to
3A
VCTRL=2.5V to 12V, VIN=1.75V to 5.5V, IO=10mA
VADJ=0V
VCTRL=2.75V, VIN=2.1V, IO=10mA to 3A,VADJ=0V
2.450
2.400
2.744
2.688
3.234
3.168
1.238
2.500
2.800
3.300
1.250
1.0
1.0
2.550
2.600
2.856
2.912
3.366
3.432
1.263
3.0
5.0
V
V
V
V
mV
mV
Dropout Voltage Minimum VCTRL (Note2)
(VCTRL – VOUT)
Dropout Voltage Minimum VIN(Note2)
(VIN - VOUT)
Current Limit
VADJ=0V
VIN=2.05V, IO=1A
VADJ=0V
VIN=2.75V, IO=3A
VCTRL=2.75V, VIN=2.05V,dVO=100mV,VADJ=0V
1.05 1.18 V
0.40 0.50 V
3.1 A
Minimum Load Current
Thermal Regulation
VCTRL=5V, VIN=3.3V,VADJ=0V
30ms Pulse
5 10 mA
0.002 0.02 %W
Ripple Rejection
Control Pin Current
Adjustable Pin Current
Thermal Resistance
VCTRL=3.75V VIN=3.75V, IO=2.3A,VADJ=0V
TJ=25, VRIPPLE=1Vpp at 120Hz
VADJ=0V
VCTRL =2.75V, VIN=2.05V, IO=3A
VCTRL=2.75V, VIN=2.05V,VADJ=0V IO=10mA
TO-220-5
Junction to Case (θJC)
60
80 dB
60 120
mA
50 120 µA
3 °C/W
TO-263-5
Junction to Ambient
(θJA)
Junction to Case (θJC)
50 °C/W
3 °C/W
Junction to Ambient
(θJA)
60 °C/W
The Bold specifications applying to the over full operating temperature range.
Note 1: Low duty cycle pulse testing with Kelvin connections are required to order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum differential between VIN and VOUT or VCTRL and VOUT required to maintain regulation at VOUT
99% Nominal VOUT.
Note 3: VREF is measured across Adjust pin to Sense pin.
Rev. 10/2/00


Part Number AS1582
Description 3A Ultra Low Dropout Voltage Regulator
Maker Sipex
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AS1582 Datasheet PDF






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