AS1117 ETC, AS1117 Datasheet

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AS1117

Manufacturer Part Number
AS1117
Description
800mA Low Dropout Regulator SCSI-II Active Terminator
Manufacturer
ETC
Datasheet

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FEATURES
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 F or larger is needed for output stability of AS1117 as required by most of the other regulator circuits. Use of ALPHA
Semiconductor’s design, processing and testing techniques make our AS1117 superior over similar products.
ORDERING INFORMATION
X= Output Voltage (X = 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0, or Blank for Adjustable)
Guaranteed 800mA Output
Three Terminal Adjustable Or Fixed 1.5V, 2.5V, 2.85V, 3V, 3.3V & 5V
Very Low Quiescent Current
Low Dropout Voltage Of 1.2 Volts At Full Load
Extremely Tight Load And Line Regulation
Very Low Temperature Coefficient
Fixed 2.85V Device For SCSI-II Active Terminator
Logic-Controlled Electronic Shutdown
Internal Overcurrent Limiting & Thermal Overload Protection
Surface Mount Package SOT-223, TO-252, TO-220, SOT-89, TO-263, & SO-8
AS1117U-X
AS1117U
TO-220
3-PIN
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390
GND
V
V
N/C
OUT
OUT
8-Pin Surface Mount (S)
ALPHA
SEMICONDUCTOR
Excellence in Analog Power Products
1
2
3
4
Top View
ALPHA
AS1117
AS1117T-X
AS1117T
TO-263
3-PIN
8
7
6
5
N/C
V
V
V
IN
IN
IN
ADJ/GND
AS1117M3-X
TO-220-3 (U)
AS1117M3
Front View
SOT-223
ALPHA
AS1117
1
3-PIN
V
2
OUT
3
V
IN
PIN CONNECTIONS
ADJ/GND
SOT-89 (M1)
1
Top View
ALPHA
AS1117
SOIC 8 PIN
AS1117S-X
PLASTIC
V
2
AS1117S
OUT
3
V
IN
ADJ/GND
SOT-223 (M3)
1
Top View
ALPHA
AS1117
800mA Low Dropout Regulator
AS1117M1-X
V
OUT
AS1117M1
2
SOT-89
3-PIN
3
APPLICATIONS
V
IN
SCSI-II Active Terminator
Portable/ Palm Top / Notebook Computers
Battery Chargers
Disk Drives
Portable Consumer Equipment
Portable Instrumentation
SMPS Post-Regulator
SCSI-II Active Terminator
ADJ/GND
TO-263-3 (T)
1
Top View
ALPHA
AS1117
V
2
OUT
AS1117R-X
AS1117R
3
V
TO-252
IN
DPAK
ADJ/GND
TO-252 (R)
Front View
1
ALPHA
AS1117
V
2
OUT
AS1117
-40 C to +85 C
-40 C to +85 C
3
V
Oper. Temp.
IN
Rev. 9/14/99
Range

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AS1117 Summary of contents

Page 1

... 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. 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. ...

Page 2

... ABSOLUTE MAXIMUM RATINGS Power Dissipation.......................................Internally Limited Lead Temp. (Soldering, 5 Seconds) .............................. 260°C Storage Temperature Range .......................... -65° to +150°C Operating Junction Temperature Range AS1117 ................................................-40C° to +125°C ELECTRICAL CHARACTERISTICS at Boldface apply over the full operating temperature range. Parameter 1.5V Version Output Voltage 2 ...

Page 3

... APPLICATION NOTES EXTERNAL CAPACITOR To ensure the stability of the AS1117 an output capacitor of at least 10 F (tantalum) (aluminum) is required. The value may change based on the application requirements on the output load or temperature range. The capacitor equivalent series resistance (ESR) will effect the AS1117 stability. The value of ESR can vary from the type of capacitor used in the applications ...

Page 4

... OUT ADJ R 1 LOAD THERMAL RESISTANCE JUNCTION TO AMBIENT 46°C/W 47°C/W 49°C/W 51°C/W 53°C/W 55°C/W 58°C/W 59°C/W 67°C/W 72°C/W 85°C/W ALPHA IN AS1117 IN OUT ADJ I ADJ 50uA (1 OUT REF 2 1 ADJ 2 Typical Adjustable Regulator AS1117 V OUT REF Rev. 9/14/99 ...

Page 5

... AS1117 0.127) (4.470 ± 0.051) (1.270 ± Rev. 9/14/99 ...

Page 6

... Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 0.124 0.116 0.146 0.295 0.130 0.264 0.041 0.033 0.146 0.130 0.264 0.248 Max 0.033 16 C 0.025 10 C AS1117 0.014 0.010 Rev. 9/14/99 ...

Page 7

... Tapered 1 2 Sides SEATING PLANE 1.020 ± 0.015 (25.910 ± 0.381) 0.015 ± 0.010/-0.015 (2.667± 0.254/-0.381) AS1117 Rev. 9/14/99 ...

Page 8

... Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 4.0 (0.158) 3.8 (0.150) BSC 1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 5.0 (0.197) 4.8 (0.188) 0.20 (0.008) 0.10 (0.004) 5.2 (0.205) 6.2 (0.244) 4.6 (0.181) 5.8 (0.228) 0.77 (0.030) 0.64 (0.025) 45 0.37 (0.015 PLCS) BSC 3 -6 0.22 (0.009 PLCS) 0.19 (0.007) AS1117 Rev. 9/14/99 ...

Page 9

... MAX A 4.40 4.60 B 2.29 2.60 C 140 160 D 0.36 0.48 E 1.62 1.80 F 0.44 0.53 G 150 BSC J 0.35 0.44 K 0.80 1.04 L 300 BSC N 2.04 2.28 P 3.94 4.25 AS1117 INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167 Rev. 9/14/99 ...

Page 10

... AS1117 4,5 4 Rev. 9/14/99 ...

Page 11

... ALPHA Semiconductor. Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Fax: (925) 417-1390 ALPHA Semiconductor-Taiwan 12F, No. 171, Sun Teh Road Taipei, Taiwan Tel: 886-2-27281190 Fax: 886-2-27591822 e-mail: alphasemi@ms14.hinet.net AS1117 Rev. 9/14/99 ...

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