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FEATURES
ALPHA
SEMICONDUCTOR
Excellence in Analog Power Products
AS1117
800mA Low Dropout Regulator SCSI-II Active Terminator
* 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
APPLICATIONS
* SCSI-II Active Terminator * Portable/ Palm Top / Notebook Computers * Battery Chargers * Disk Drives * Portable Consumer Equipment * Portable Instrumentation * 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 10F 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
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 -40C to +85C -40C to +85C
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 VOUT VOUT
1 2
8 7
V IN VIN 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
VOUT VIN
VOUT VIN ADJ/GND ADJ/GND VOUT VIN V OUT V IN
Top View Top View
ADJ/GND
Top View
VOUT VIN
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
AS1117
ABSOLUTE MAXIMUM RATINGS
Power Dissipation.......................................Internally Limited Lead Temp. (Soldering, 5 Seconds) .............................. 260C Storage Temperature Range .......................... -65 to +150C Operating Junction Temperature Range AS1117 ................................................-40C to +125C Input Supply Voltage.................................... -20V to +20V ESD Rating .........................................................2KV Min
ELECTRICAL CHARACTERISTICS at VIN = VOUT +1, Ta=25C, CL =3.3f, unless otherwise specified. Limits in Boldface apply over the full operating temperature range. AS1117 Parameter
1.5V Version Output Voltage 2.5V Version Output Voltage 2.85V Version Output Voltage 3.0V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Output Options Reference Voltage Output Voltage Temperature Stability Line Regulation
Conditions
IOUT = 10mA, VIN = 4.85V 0IOUT800mA, 4.25VIN10V IOUT = 10mA, VIN = 4.85V 0IOUT800mA, 4.25VIN10V IOUT = 10mA, VIN = 4.85V 0IOUT800mA, 4.25VIN10V IOUT = 10mA, VIN = 4.85V 0IOUT800mA, 4.75VIN10V IOUT = 10mA, VIN = 5.0V 0IOUT800mA, 4.75VIN10V IOUT = 10mA, VIN = 7.0V 0IOUT800mA, 6.50VIN12V IOUT = 10mA, (VIN - VOUT) = 2V 10 IOUT800mA, 1.4(VIN -VIN) 10V (Note 1) 4.25V VIN10V, VOUT = 2.85, IOUT = 0 4.50V VIN12V, VOUT = 3.00, IOUT = 0 4.80V VIN12V, VOUT = 3.30, IOUT = 0 6.50V VIN15V, VOUT = 5.00, IOUT = 0 0IOUT800mA, VIN = 4.25V, VOUT = 2.85 0IOUT800mA, VIN = 4.50V, VOUT = 3.00 0IOUT800mA, VIN = 4.80V, VOUT = 3.30 0IOUT800mA, VIN = 6.50V, VOUT = 5.00 IL = 100mA IL = 500mA IL = 800mA 4.25V VIN6.5V (VIN-VOUT) = 5V 25C,30mS Pulse fRIPPLE = 120Hz, (Vin-VOUT) = 3V, VRIPPLE = 1Vp-p 125C, 1000Hrs % of Vout, 10Hzf10kHz Junction to case, at tab
Typ
1.500
Min
1.485 1.470 2.475 2.450 2.822 2.793 2.970 2.940 3.267 3.234 4.950 4.900 1.238 1.225
Max
1.515 1.530 2.525 2.550 2.879 2.907 3.030 3.060 3.333 3.366 5.050 5.100 1.262 1.270 0.05 6.00 7.00 7.00 10.00 10.00 12.00 12.00 15.00 1.10 1.15 1.20 10.00 1200 0.1 75 0.03 0.003 15
Units
V
2.500
V
2.850
V
3.000
V
3.300
V
5.000
V
1.250
V % mV
1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.05 1.10 5.00 1000 0.01 60
Load Regulation
mV
Dropout Voltage ( Note 2) Quiescent Current Current Limit Thermal Regulation Ripple Rejection Long Term Stability RMS Output Noise Thermal Resistance
V
mA mA %/W dB % % C/W
Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 3: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied. excluding load or line regulation effect.
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
APPLICATION NOTES EXTERNAL CAPACITOR
To ensure the stability of the AS1117 an output capacitor of at least 10F (tantalum)or 50F (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. The recommended value for ESR is 0.5. The output capacitance could increase in size to above the minimum value. The larger value of output capacitance as high as 100F can improve the load transient response. Maximum Junction Temperature range: TJ = Tambient (max) + PD* thermal resistance (Junction-toambient) Maximum Junction temperature must not exceed the 125C.
10V
2.85V
AS1117-2.85
+ +
SOLDERING METHODS
The AS1117 SOT-223 package is designed to be compatible with infrared reflow or vapor-phase reflow soldering techniques. During soldering the non-active or mildly active fluxes may be used. The AS1117 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. Hand soldering and wave soldering should be avoided since these methods can cause damage to the device with excessive thermal gradients on the package. The SOT-223 recommended soldering method are as follows: vapor phase reflow and infrared reflow with the component preheated to within 65C of the soldering temperature range.
10uF
10uF
27K ..
PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW
Fig. 1. Circuit Layout, Thermal Experiments.
THERMAL CHARACTERISTICS
The thermal resistance of AS1117 is 15C/W from junction to tab and 31 C/W from tab to ambient for a total of 46 C/W from junction to ambient. The AS1117 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continuos load conditions the maximum junction temperature does not exceed 125 C. Taking the FR-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment (fig.1 & fig.2), the PCB material is effective at transmitting heat with the tab attached to the pad area and a ground plane layer on the backside of the substrate. Refer to table 1 for the results of the experiment. The thermal interaction from other components in the application can effect the thermal resistance of the AS1117. The actual thermal resistance can be determined with experimentation. AS1117 power dissipation is calculated as follows: PD = (VIN - VOUT)(IOUT)
50 X 50 mm
35 X 17 mm
16 X 10 mm
Fig. 2. Substrate Layout for SOT-223
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
Table 1.
TOTAL PC BOARD AREA 2500mm 2500mm 2500mm 2500mm 2500mm 1600mm 2500mm 2500mm 1600mm 900mm 900mm TOPDIDE COPPER AREA 2500mm 1250mm 950mm 2500mm 1800mm 600mm 1250mm 915mm 600mm 240mm 240mm BACKSIDE COPPER AREA 2500mm 2500mm 2500mm 0 0 1600mm 0 0 0 900mm 0 THERMAL RESISTANCE JUNCTION TO AMBIENT 46C/W 47C/W 49C/W 51C/W 53C/W 55C/W 58C/W 59C/W 67C/W 72C/W 85C/W
VIN C1
IN
ALPHA AS1117
ADJ
OUT
VIN C1
R1
IN
ALPHA AS1117
ADJ I ADJ 50uA
OUT C2 vREF R 1
VOUT
LOAD
VOUT= VREF(1+R2/R1) +IADJ R2
R2
800mA Current output Regulator
Typical Adjustable Regulator
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING TO-263-3L (T)
0.405 (10.287

0.005 0.127)
0.055 (1.397)
0.176 0.005 (4.470 0.050 0.002 (1.270

0.127) 0.051)
0.356 (9.042

0.005 0.127) 0.600 + 0.025 (15.24 0.635)
0.103 BSC (2.616)
0.050 (1.270) 0.032 + 0.001 (0.813 + 0.025) -
0.015 (0.381
+ + -
0 8 0.003 0.074)
0.100 (2.540

0.010 0.254)
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING SOT-223-3L (M3)
0.124 0.116
0.146 0.295 0.130 0.264
0.0905 NOM 0.181 NOM
0.041 0.033
0.146 0.130 0.0040 0.0008 0.264 0.248
16C 10C 16C 10C Max 0.014 0.010
0.033 0.025
16C 10C
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING TO-220-3L (U)
0.151D 0.002 (3.835 D 0.051) 0.408 0.013 (10.36 0.33) 0.110 0.010 (2.794 0.254)
0.180 0.005 (4.572 0.127) 0.050 0.002 (1.270 0.051)
0.250 0.010 (6.350 0.254) Tapered 1o 2 Sides
0.340 0.010 (8.636 0.254)
SEATING PLANE
0.150 MIN (3.81 MIN) 7o Typ. 0.540 0.015 (13.720 0.381) 0.410 (10.41)
1.020 0.015 (25.910 0.381)
0.050 TYP (1.27 TYP) 0.200 0.010 (5.080 0.254)
0.100 0.010 (2.540 0.254) 0.015 0.010/-0.002 0.032 0.005 (0.813 0.127) (0.381 0.254/-0.051)
0.015 0.010/-0.015 (2.667 0.254/-0.381)
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING 8-PIN SOIC (S)
4.0 (0.158) 3.8 (0.150)
5.2 (0.205) 4.6 (0.181)
6.2 (0.244) 5.8 (0.228)
Pin 1
1.27 (0.50) 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) 0.37 (0.015) BSC 0.77 (0.030) 0.64 (0.025) 7 (4 PLCS)
45
3 -6
0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) 0.20 (0.008) 0.10 (0.004) 0.22 (0.009) 0.19 (0.007) 7 (4 PLCS)
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING SOT-89 (M1)
A
C
J
N P 1 2 3
K B F G -TD
STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER
STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE
DIM A B C D E F G J K L N P
STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION
STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE
MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25
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
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
PACKAGE DRAWING TO-252-3L (R)
-AL2 -BA A1 C1 A
E b2
4 SEATING PLANE D 1 -C2 3 L L3 L1 H
b 3 PLCS
.010
M AM
b1 e e1 D1 NOTES
1. 2. 3. 4.
c
8
A
C
TERM 4
E1
Refer To Applicable Symbol List. Dimensions And Tolerancing Per Ansi Y14.5m - 1982. Lead Dimension Uncontrolled in L 3 . Tab Contour Optional Within Dim. b 2 & L2 And E1 & D1 5. D1 & E1 Establishes A Minimum Mounting Surface for Terminal 4. 6. L is the Termal Length for Soldering. 7. Controlling Dimension: Inch 8. 2 Mils Suggested For Postive Contact At Mounting.
BACK VIEW A-A
S Y M B O L A A1 b b1 b2 c c1 D D1 E E1 e e1 H L L1 L2 L3
INCHES MIN 0.086 0.035 0.025 0.300 0.205 0.018 0.018 0.235 0.170 0.250 0.170 0.098 0.180 0.370 0.020 0.025 0.035 0.045 0.410 0.040 0.050 0.060 9.398 0.508 0.635 0.889 1.143 MAX 0.094 0.045 0.035 0.045 0.215 0.023 0.023 0.245 0.265 MIN 2.184 0.889 0.635 7.620 5.207 0.457 0.457 5.969 4.318 6.350 4.318
MM MAX 2.3876 1.143 0.889 1.143 5.461 0.5842 0.5842 6.223 6.731 2.489 4.572 10.414 1.016 1.270 1.524
N O T E
4
4,5
4,5
6
4 3
Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390 Rev. 9/14/99
AS1117
ADVANCE INFORMATION- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. PRELIMINARY INFORMATION- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges. The information provided here is believed to be reliable and accurate, however ALPHA assumes no responsibility for its use. ALPHA makes no guarantee for any errors that appear in this document. `Typical' parameters can and do vary in different applications. All operating parameters, including `Typical' must be validated for each custormer application by customer's technical experts. Specifications are subject to change without notice, contact ALPHA in order to obtain the latest version of the device specification sheet before using any ALPHA devices. ALPHA is not responsible for any defects that occur in equipment using any ALPHA devices. ALPHA makes no representation that the circuit descriptions herein will not infringe upon existing patent rights.
ALPHA Semiconductor, Inc. 1031 Serpentine Lane Pleasanton, CA 94566 USA Tel: (925) 417-1391 Fax: (925) 417-1390 e-mail: alphasem@best.com web: www.alpha-semi.com
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
LIFE SUPPORT APPLICATION POLICY: ALPHA Semiconductor products are not authorized for use as critical components in life support devices or systems, nuclear power, aircraft, or space equipment without express written approval from the president of ALPHA Semiconductor.
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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