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AS1117U-X Datasheet

  • AS1117U-X

  • 800mA Low Dropout Regulator SCSI-II Active Terminator

  • 11頁

  • ALPHA

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偽
FEATURES
ALPHA
SEMICONDUCTOR
Excellence in Analog Power Products
AS1117
800mA Low Dropout Regulator
SCSI-II Active Terminator
鈥?/div>
Guaranteed 800mA Output
鈥?/div>
Three Terminal Adjustable Or Fixed 1.5V, 2.5V, 2.85V, 3V, 3.3V & 5V
鈥?/div>
Very Low Quiescent Current
鈥?/div>
Low Dropout Voltage Of 1.2 Volts At Full Load
鈥?/div>
Extremely Tight Load And Line Regulation
鈥?/div>
Very Low Temperature Coefficient
鈥?/div>
Fixed 2.85V Device For SCSI-II Active Terminator
鈥?/div>
Logic-Controlled Electronic Shutdown
鈥?/div>
Internal Overcurrent Limiting & Thermal Overload Protection
鈥?/div>
Surface Mount Package SOT-223, TO-252, TO-220, SOT-89, TO-263, & SO-8
APPLICATIONS
鈥?/div>
SCSI-II Active Terminator
鈥?/div>
Portable/ Palm Top / Notebook Computers
鈥?/div>
Battery Chargers
鈥?/div>
Disk Drives
鈥?/div>
Portable Consumer Equipment
鈥?/div>
Portable Instrumentation
鈥?/div>
SMPS Post-Regulator
PRODUCT DESCRIPTION
The ALPHA Semiconductor AS1117 is a low power positive-voltage regulator designed to meet 800mA output current and comply
with SCSI-II specifications with a fixed output voltage of 2.85V. This device is an excellent choice for use in battery-powered
applications, as active terminators for the SCSI bus, and portable computers. The AS1117 features very low quiescent current and
very low dropout voltage of 1.2V at a full load and lower as output current decreases. AS1117 is available as an adjustable or fixed
2.85V, 3V, 3.3V, and 5V output voltages.
The AS1117 is offered in a 3-pin surface mount package SOT-223, TO-252, TO-220, SOT-89 & TO-263. The output capacitor of
10碌F or larger is needed for output stability of AS1117 as required by most of the other regulator circuits. Use of ALPHA
Semiconductor鈥檚 design, processing and testing techniques make our AS1117 superior over similar products.
ORDERING INFORMATION
TO-220
3-PIN
AS1117U
AS1117U-X
TO-263
3-PIN
AS1117T
AS1117T-X
SOT-223
3-PIN
AS1117M3
AS1117M3-X
PLASTIC
SOIC 8 PIN
AS1117S
AS1117S-X
SOT-89
3-PIN
AS1117M1
AS1117M1-X
TO-252
DPAK
AS1117R
AS1117R-X
Oper. Temp.
Range
-40擄C to +85擄C
-40擄C to +85擄C
X= Output Voltage (X = 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0, or Blank for Adjustable)
PIN CONNECTIONS
8-Pin Surface Mount (S)
TO-220-3 (U)
SOT-89 (M1)
SOT-223 (M3)
TO-263-3 (T)
TO-252 (R)
GND
N/C
V
OUT
V
OUT
1
2
8
7
V
IN
V
IN
V
IN
N/C
ALPHA
AS1117
ALPHA
AS1117
1
2
3
1
2
3
1
ADJ/GND
ALPHA
3
AS1117
6
4
5
ALPHA
AS1117
2
3
1
ALPHA
AS1117
2
3
1
ALPHA
AS1117
2
3
ADJ/GND
V
OUT
V
IN
V
OUT
V
IN
ADJ/GND
ADJ/GND
V
OUT
V
IN
V
OUT
V
IN
Top View
Top View
ADJ/GND
Top View
V
OUT
V
IN
Top View
Front View
Front View
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390
Rev. 9/14/99

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