AS1117U [ALPHA]
800mA Low Dropout Regulator SCSI-II Active Terminator; 800毫安低压差稳压器的SCSI -II主动终结者
| 型号： | AS1117U |
| 厂家： | 
ALPHA INDUSTRIES |
| 描述： | 800mA Low Dropout Regulator SCSI-II Active Terminator |
| 文件： | 总11页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ALPHA
SEMICONDUCTOR
Excellence in Analog Power Products
a
AS1117
800mA Low Dropout Regulator
SCSI-II Active Terminator
FEATURES
APPLICATIONS
· Guaranteed 800mA Output
· SCSI-II Active Terminator
· Portable/ Palm Top / Notebook Computers
· Battery Chargers
· 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
· Disk Drives
· Portable Consumer Equipment
· Portable Instrumentation
· SMPS Post-Regulator
· Internal Overcurrent Limiting & Thermal Overload Protection
· Surface Mount Package SOT-223, TO-252, TO-220, SOT-89, TO-263, & SO-8
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
10mF 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
SOT-89
3-PIN
AS1117M1
AS1117M1-X
TO-252
DPAK
AS1117R
AS1117R-X
Oper. Temp.
Range
-40°C to +85°C
-40°C to +85°C
AS1117S-X
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)
TO-263-3 (T)
SOT-89 (M1)
SOT-223 (M3)
TO-252 (R)
1
2
8
7
GND
N/C
V
V
V
V
IN
ALPHA
AS1117
2
ALPHA
AS1117
2
ALPHA
AS1117
ALPHA
AS1117
2
IN
ALPHA
AS1117
1
ALPHA
AS1117
3
1
3
1
3
2
3
3
4
6
5
1
OUT
IN
1
2
3
ADJ/GND
V
V
OUT
ADJ/GND
V
V
V
IN
N/C
OUT
IN
OUT
ADJ/GND
V
V
OUT
IN
Top View
Top View
Top View
ADJ/GND
V
V
OUT
IN
Front View
Top View
ADJ/GND
V
V
IN
OUT
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) ..............................260°C
Storage Temperature Range .......................... -65° to +150°C
Operating Junction Temperature Range
Input Supply Voltage.................................... -20V to +20V
ESD Rating .........................................................2KV Min
AS1117................................................-40C° to +125°C
ELECTRICAL CHARACTERISTICS at VIN = VOUT +1, Ta=25°C, CL =3.3mf, unless otherwise specified. Limits in
Boldface apply over the full operating temperature range.
AS1117
Typ
Min
Max
Parameter
1.5V Version
Conditions
Units
IOUT = 10mA, VIN = 4.85V
0£IOUT£800mA, 4.25£VIN£10V
1.500
1.485
1.470
1.515
1.530
V
Output Voltage
2.5V Version
Output Voltage
IOUT = 10mA, VIN = 4.85V
0£IOUT£800mA, 4.25£VIN£10V
2.500
2.475
2.450
2.525
2.550
V
2.85V Version
Output Voltage
IOUT = 10mA, VIN = 4.85V
0£IOUT£800mA, 4.25£VIN£10V
2.850
3.000
3.300
2.822
2.793
2.879
2.907
V
V
V
3.0V Version
Output Voltage
IOUT = 10mA, VIN = 4.85V
0£IOUT£800mA, 4.75£VIN£10V
2.970
2.940
3.030
3.060
3.3V Version
Output Voltage
IOUT = 10mA, VIN = 5.0V
0£IOUT£800mA, 4.75£VIN£10V
3.267
3.234
3.333
3.366
5.0V Version
Output Voltage
IOUT = 10mA, VIN = 7.0V
0£IOUT£800mA, 6.50£VIN£12V
5.000
1.250
4.950
4.900
5.050
5.100
V
All Output Options
IOUT = 10mA, (VIN – VOUT) = 2V
10£ IOUT£800mA, 1.4£(VIN -VIN) £10V
(Note 1)
1.238
1.225
1.262
1.270
V
Reference Voltage
%
0.05
Output Voltage
Temperature Stability
Line Regulation
1.00
1.00
1.00
1.00
6.00
7.00
7.00
mV
mV
V
4.25V £VIN£10V, VOUT = 2.85, IOUT = 0
4.50V £VIN£12V, VOUT = 3.00, IOUT = 0
4.80V £VIN£12V, VOUT = 3.30, IOUT = 0
6.50V £VIN£15V, VOUT = 5.00, IOUT = 0
0£IOUT£800mA, VIN = 4.25V, VOUT = 2.85
0£IOUT£800mA, VIN = 4.50V, VOUT = 3.00
0£IOUT£800mA, VIN = 4.80V, VOUT = 3.30
0£IOUT£800mA, VIN = 6.50V, VOUT = 5.00
IL = 100mA
10.00
1.00
1.00
1.00
1.00
10.00
12.00
12.00
15.00
Load Regulation
1.00
1.05
1.10
5.00
1.10
1.15
1.20
Dropout Voltage
( Note 2)
IL = 500mA
IL = 800mA
4.25V £VIN£6.5V
10.00
mA
mA
%/W
dB
Quiescent Current
Current Limit
(VIN-VOUT) = 5V
1000
0.01
60
1200
0.1
25°C,30mS Pulse
Thermal Regulation
Ripple Rejection
fRIPPLE = 120Hz, (Vin-VOUT) = 3V,
VRIPPLE = 1Vp-p
75
125°C, 1000Hrs
0.03
0.003
15
%
%
Long Term Stability
RMS Output Noise
Thermal Resistance
% of Vout, 10Hz£f£10kHz
Junction to case, at tab
°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
Maximum Junction Temperature range:
APPLICATION NOTES EXTERNAL
CAPACITOR
TJ = Tambient (max) + PD* thermal resistance (Junction-to-
ambient)
Maximum Junction temperature must not exceed the 125°C.
To ensure the stability of the AS1117 an output capacitor of
at least 10mF (tantalum)or 50mF (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 0.5W. The output capacitance could
increase in size to above the minimum value. The larger
value of output capacitance as high as 100mF can improve
the load transient response.
10V
2.85V
AS1117-2.85
+
+
SOLDERING METHODS
27K
W..
10uF
10uF
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 65°C of the soldering temperature range.
PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW
Fig. 1. Circuit Layout, Thermal Experiments.
THERMAL CHARACTERISTICS
50 X 50 mm
The thermal resistance of AS1117 is 15°C/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.
35 X 17 mm
16 X 10 mm
Fig. 2. Substrate Layout for SOT-223
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
)
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
TOPDIDE COPPER AREA
BACKSIDE COPPER AREA
THERMAL RESISTANCE
JUNCTION TO AMBIENT
2500mm
2500mm
2500mm
2500mm
2500mm
1600mm
2500mm
2500mm
1600mm
900mm
2500mm
1250mm
950mm
2500mm
1800mm
600mm
1250mm
915mm
600mm
240mm
240mm
2500mm
2500mm
2500mm
0
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°
0
1600mm
0
0
0
900mm
0
900mm
ALPHA
AS1117
VIN
ALPHA
AS1117
OUT
V
IN
V
OUT
IN
OUT
IN
C1
C
2
C
1
ADJ
vREF
ADJ
R
1
R1
IADJ
50uA
LOAD
R2
VOUT= VREF(1+R2/R1) +IADJ R2
Typical Adjustable Regulator
800mA Current output
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)
(4.470 ±
0.127)
0.051)
0.176±
0.050 ±
0.005
0.055 (1.397)
±
0.405
0.005
±
0.002 (1.270
±
(10.287 0.127)
±
0.356 0.005
±
(9.042 0.127)
0.600 + 0.025
-
±
(15.24
0.635)
±
0.010
0.100
±
(2.540 0.254)
0° 8°
0.003
0.103 BSC
(2.616)
0.050 (1.270)
+
-
0.032 + 0.001
0.015
-
+
(0.813 +- 0.025)
-
(0.381 0.074)
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
0.041
0.033
0.0905 NOM
0.181 NOM
0.146
0.130
°
16 C
°
10 C
0.264
0.248
0.0040
0.0008
0.014
0.010
°
16 C
10°C Max
°
16 C
0.033
0.025
°
10 C
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)
0.180 ± 0.005
0.151D ± 0.002
(4.572 ± 0.127)
(3.835 D ± 0.051)
0.408 ± 0.013
(10.36 ± 0.33)
0.050 ± 0.002
(1.270 ± 0.051)
0.110 ± 0.010
(2.794 ± 0.254)
0.250 ± 0.010
(6.350 ± 0.254)
Tapered 1o
2 Sides
0.340 ± 0.010
(8.636 ± 0.254)
SEATING PLANE
1.020 ± 0.015
(25.910 ± 0.381)
0.150 MIN
(3.81 MIN)
7o Typ.
0.540 ± 0.015
(13.720 ± 0.381)
0.410
(10.41)
0.050 TYP
(1.27 TYP)
0.015 ± 0.010/-0.015
(2.667± 0.254/-0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.200 ± 0.010
(5.080 ± 0.254)
0.015 ± 0.010/-0.002
(0.381± 0.254/-0.051)
0.032 ± 0.005
(0.813 ± 0.127)
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)
0.77 (0.030)
0.64 (0.025)
°
(4 PLCS)
°
45
5.0 (0.197)
4.8 (0.188)
0.37 (0.015)
BSC
7
°
3
-6°
0.56 (0.022)
0.49 (0.019)
0.22 (0.009)
0.19 (0.007)
°
7
(4 PLCS)
0.45 (0.018)
0.35 (0.014)
0.20 (0.008)
0.10 (0.004)
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)
C
A
J
N
P
2
1
3
K
B
F
D
G
-T-
STYLE 3
DIM
MILLIMETERS
INCHES
STYLE 1
PIN 1. BASE
MIN
4.40
2.29
140
MAX
4.60
2.60
160
MIN
MAX
PIN 1. GATE
2. ANODE
A
B
C
D
E
F
G
J
0.174
0.091
0.056
0.015
0.064
0.018
0.181
0.102
0.062
0.018
0.070
0.020
2. COLLECTOR
3. EMITTER
3. CATHODE
0.36
1.62
0.44
0.48
1.80
0.53
STYLE 2
PIN 1. ANODE
2. CATHODE
3. NO CONNECTION
STYLE 4
PIN 1. DRAIN
150 BSC
0.059 BSC
0.35
0.80
0.44
1.04
0.014
0.032
0.017
0.040
2. GATE
3. SOURCE
K
L
300 BSC
0.118 BSC
N
P
2.04
3.94
2.28
4.25
0.081
0.156
0.089
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)
-B-
-A-
L2
E
A
A1
C1
b2
A
4
2
SEATING
PLANE
D
L3
L1
H
3
1
L
-C-
b
b1
c
8
A
3 PLCS
e
M
.010
A
M
C
e1
D1
NOTES
1. Refer To Applicable Symbol List.
2. Dimensions And Tolerancing Per Ansi Y14.5m - 1982.
3. Lead Dimension Uncontrolled in L 3
.
4. 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.
E1
TERM 4
7. Controlling Dimension: Inch
8. 2 Mils Suggested For Postive Contact At Mounting.
S
Y
M
B
O
L
BACK VIEW A-A
N
O
T
INCHES
MM
MIN
MAX
0.094
0.045
0.035
0.045
0.215
0.023
0.023
0.245
-
MIN
MAX
2.3876
1.143
0.889
1.143
5.461
0.5842
0.5842
6.223
-
E
A
A1
b
0.086
0.035
0.025
0.300
0.205
0.018
0.018
0.235
0.170
0.250
0.170
2.184
0.889
0.635
7.620
5.207
0.457
0.457
5.969
4.318
6.350
4.318
b1
b2
c
4
c1
D
D1
E
4,5
4,5
0.265
-
6.731
-
E1
e
0.098
0.180
2.489
4.572
e1
H
0.370
0.020
0.025
0.035
0.045
0.410
-
9.398
0.508
0.635
0.889
1.143
10.414
-
L
6
L1
L2
L3
0.040
0.050
0.060
1.016
1.270
1.524
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
ALPHA Semiconductor-Taiwan
12F, No. 171, Sun Teh Road
Taipei, Taiwan
Tel: (925) 417-1391
Fax: (925) 417-1390
Tel: 886-2-27281190
Fax: 886-2-27591822
e-mail: alphasem@best.com
web: www.alpha-semi.com
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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