AS2884AU-3.3 [ETC]
Analog IC ; 模拟IC\n
| 型号： | AS2884AU-3.3 |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总4页 (文件大小：101K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AS2884
8A Low DropOut Voltage Regulator
Adjustable & Fixed 3.3V
FEATURES
APPLICATIONS
• Adjustable Output Down to 1.2V or Fixed 3.3V & 5V
• Output Current of 8A
• Powering Intel Pentium µP from +5V Supplies
• Power PCSupplies
• Low Dropout Voltage
• SMPS Post-Regulator
• Extremely Tight Load and Line Regulation
• Current & Thermal Limiting
• High Efficiency “Green” Computer Systems
• High Efficiency Linear Power Supplies
• Portable Instrumentation
• Standard 3-Terminal Low Cost TO-220
• Similar to Industry Standard LT1083/LT1584
• Constant Current Regulators
• Adjustable Power Supplies
• Battery Charger
PRODUCT DESCRIPTION
The AS2884 is a low power 8A Adjustable Voltage Regulator that is very easy to use. It requires only 2 external resistors to set the
output voltage. This device is an excellent choice when using Powering Intel Microprocessor to convert from +5V to 3.3V supplies,
and as a post regulator for switching supplies applications. The AS2884 features low dropout of a maximum 1.5 volts.
The AS2884 offers full protection against over-current faults, reversed input polarity, reversed load insertion, over temperature
operation, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The IQ of this device
flows into the load which increases efficiency.
The AS2884 is offered in a 3-pin TO-220 package compatible with older 3-terminal regulators. For a 5A low dropout regulator refer
to the AS2850 datasheet.
ORDERING INFORMATION
TO-220
3-PIN
AS2884AU
X = Output Voltage (i.e. 3.3 for 3.3V, 5.0 for 5.0V etc.)
PIN CONNECTIONS
Y = Output Tolerance, A for 1%
Blank for 2%
TO-220-3 (U)
Consult with factory for fixed output voltage
AS2884
1
2
3
VIN
V
ADJ/GND
OUT
Front View
Rev. 9/29/00
AS2884
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................-65° to +150°C
Operating Junction Temperature Range
Input Supply Voltage ...................................................... 30V
Input to Output Voltage Differential............................... 30V
AS2884 Control Section............................0C° to +125°C
AS2884 Power Transistor..........................0C° to +150°C
ELECTRICAL CHARACTERISTICS (Note 1) at IOUT = 10mA, T = 25 C, unless otherwise specified.
°
A
Parameter
Conditions
AS2884A
Min
AS2884
Units
Typ
Max
Min
Max
3.3V Version
Output Voltage (Note 2)
3.3
3.3
3.270
3.240
3.330
3.360
3.230
3.201
3.370
3.399
V
AS2884-3.3V, 0≤IOUT≤8A,
4.75V≤VIN≤25V
5.0V Version
Output Voltage (Note 2)
5.0
5.0
4.950
4.900
5.050
5.100
4.900
4.650
5.100
5.150
AS2884-3.3V, 0≤IOUT≤8A,
6.5V≤VIN≤25V
All Voltage Options
Reference Voltage
1.250
1.238
1.225
1.262
1.238
1.225
1.262
V
10 mA ≤ IOUT ≤ IFULLLOAD
1.250
1.270
1.270
3.3V≤(VIN - VOUT )≤ VIN MAX – VOUT MAX
(VIN- VOUT) = VIN MAX – VOUT MAX
Mid Load Current
Line Regulation
mA
%
5
10
10
0.015
0.05
0.1
0.2
1.1
0.2
0.5
0.3
0.4
1.2
0.2
0.5
0.3
0.4
1.2
29V ≤VIN - VOUT ≤ VIN MAX – VOUT MAX
I
LOAD = 10mA
Load Regulation
Dropout Voltage
%
V
10mA ≤ IOUT ≤ IFULLLOAD
(VIN - VOUT)=3V
IOUT=IFULLLOAD , ∆VREF=1%
Current Limit
VIN - VOUT=5V
A
9.5
8.0
8.0
Long Term Stability
0.3
1
90
5
1
90
5
%
TA=125°C, 1000Hrs.
Adjust Pin Current
55
0.2
TA=25°C
µA
µA
%/W
%
Adjust Pin Current
Change
Thermal Regulation
30ms pulse
0.003
0.5
0.01
0.01
Temperature Stability
Ripple Rejection Ratio
VIN - VOUT=3V
dB
75
60
60
IOUT =3A, COUT = 25µF, CADJ = 25µF,
f= 120Hz
Output Noise, RMS
10Hz to 10kHz
0.003
% VO
Thermal Resistance
TO-220
Junction to Tab
2.7
2.7
°C/W
Junction-to-Case
Junction to Ambient
0.65
0.65
The Bold specifications apply to the full operating temperature range.
Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 2: A 10µF output capacitor is required on AS2884
Rev. 9/29/00
AS2884
TYPICAL CHARACTERISTICS
DROPOUT VOLTAGE
LOAD REGULATION
SHORT CIRCUIT CURRENT
2
0.10
0.05
0
12
INDICATES GUARANTEED TEST
POINT
-40ºC T J 150ºC
10
8
25ºC
0ºC T J 120ºC
150ºC
6
1
-0.05
-0.10
-0.15
-55ºC
TJ = -55ºC
TJ =25ºC
4
2
IFULLLOAD
TJ =150ºC
-0.20
0
0
0
5
10
15
20
25
30 35
1
2
3
4
5
6
7
8
0
9
10
-50 -25
0
25 50 75 100 125 150
OUTPUT CURRENT (A)
INPUT/OUTPUT DIFFERENTIAL (V)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE STABILITY
MINIMUM OPERATING CURRENT
ADJUSTMENT PIN CURRENT
1.270
10
9
100
90
80
8
1.260
1.250
70
60
7
6
5
4
50
TJ =150ºC
TJ =25ºC
40
30
20
10
0
3
2
1
0
1.240
1.230
TJ =-55ºC
0
5
10
15 20
25 30
35
-50 -25
0
25 50
75 100 125 150
-50 -25
0
25 50
75 100 125 150
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Rev. 9/29/00
AS2884
TYPICAL APPLICATIONS
OUT
VREF
VIN
VOUT
VIN
IN
AS2884
OUT
IN
AS2884
C2
C1
C1
R1
R2
ADJ
R1
ADJ
VOUT = VREF (1 + R ) + IADJ R2
R21
LOAD
Fig. 5 Typical Adjustable Regulator
Fig. 4 8A Current output Regulator
3.45V
VCC
VIN
OUT
IN
AS2884
+5V
C2
C1
ADJ
R1
R2
TM
Powering Intel Pentium with AS2884
Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp.
Rev. 9/29/00
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