Datasheet AS1117S-3V, AS1117S-3.3V, AS1117S-2.85V, AS1117S-2.5V, AS1117S-1.5V Datasheet (ALPSE)

Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94568 Tel: (925) 417-1391 Fax: (925) 417-1390

Rev. 9/14/99

ALPHA

SEMICONDUCTOR

Excellence in Analog Power Products

α

AS1117

800mA Low Dropout Regulator

SCSI-II Active Terminator

FEATURES APPLICATIONS

• Guaranteed 800mA Output • SCSI-II Active Terminator

• Three Terminal Adjustable Or Fixed 1.5V, 2.5V, 2.85V, 3V, 3.3V & 5V • Portable/ Palm Top / Notebook Computers

• Very Low Quiescent Current • Battery Chargers

• Low Dropout Voltage Of 1.2 Volts At Full Load • Disk Drives

• Extremely Tight Load And Line Regulation • Portable Consumer Equipment

• Very Low Temperature Coefficient • Portable Instrumentation

• Fixed 2.85V Device For SCSI-II Active Terminator • SMPS Post-Regulator

• 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

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 10µF 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

TO-263

3-PIN

SOT-223

3-PIN

PLASTIC

SOIC 8 PIN

SOT-89

3-PIN

TO-252

DPAK

Oper. Temp.

Range

AS1117U AS1117T AS1117M3 AS1117S AS1117M1 AS1117R

-40°C to +85°C

AS1117U-X AS1117T-X AS1117M3-X AS1117S-X AS1117M1-X AS1117R-X

-40°C to +85°C

X= Output Voltage (X = 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0, or Blank for Adjustable)

PIN CONNECTIONS

Top View

2

1

3

4

8

7

6

5

ALPHA AS1117

8-Pin Surface Mount (S)

ALPHA AS1117

SOT-89 (M1)

1

2

3

ALPHA AS1117

1 32

SOT-223 (M3)

Top View

TO-263-3 (T)

1

ALPHA AS1117

2

3

Front View

TO-220-3 (U)

ALPHA

AS1117

1

2 3

Front View

TO-252 (R)

ADJ/GND

V

OUT

1 2 3

V

IN

ALPHA AS1117

ADJ/GND

V

OUT

V

IN

ADJ/GND

V

OUT

V

IN

ADJ/GND

V

OUT

V

IN

GND

N/C

V

OUT

V

OUT

N/C

V

IN

V

IN

V

IN

ADJ/GND

V

OUT

V

IN

Top 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 Input Supply Voltage .................................... -20V to +20V

Lead Temp. (Soldering, 5 Seconds) ..............................260°C ESD Rating .........................................................2KV Min

Storage Temperature Range .......................... -65° to +150°C

Operating Junction Temperature Range

AS1117................................................-40C° to +125°C

ELECTRICAL CHARACTERISTICS at V

IN

= V

OUT

+1, Ta=25°C, CL =3.3µf, unless otherwise specified. Limits in

Boldface apply over the full operating temperature range.

Parameter Conditions

Typ

AS1117

Min Max

Units

1.5V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 4.85V

0≤I

OUT

≤800mA, 4.25≤VIN≤10V

1.500 1.485

1.470

1.515

1.530

V

2.5V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 4.85V

0≤I

OUT

≤800mA, 4.25≤VIN≤10V

2.500 2.475

2.450

2.525

2.550

V

2.85V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 4.85V

0≤I

OUT

≤800mA, 4.25≤VIN≤10V

2.850 2.822

2.793

2.879

2.907

V

3.0V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 4.85V

0≤I

OUT

≤800mA, 4.75≤VIN≤10V

3.000 2.970

2.940

3.030

3.060

V

3.3V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 5.0V

0≤I

OUT

≤800mA, 4.75≤VIN≤10V

3.300 3.267

3.234

3.333

3.366

V

5.0V Version

Output Voltage

I

OUT

= 10mA, V

IN

= 7.0V

0≤I

OUT

≤800mA, 6.50≤VIN≤12V

5.000 4.950

4.900

5.050

5.100

V

All Output Options

Reference Voltage

I

OUT

= 10mA, (V

IN – VOUT

) = 2V

10≤ I

OUT

≤800mA, 1.4≤(VIN -VIN) ≤10V

1.250 1.238

1.225

1.262

1.270

V

Output Voltage Temperature Stability

(Note 1)

0.05

%

Line Regulation

4.25V ≤VIN≤10V, V

OUT

= 2.85, I

OUT

= 0

4.50V ≤VIN≤12V, V

OUT

= 3.00, I

OUT

= 0

4.80V ≤VIN≤12V, V

OUT

= 3.30, I

OUT

= 0

6.50V ≤VIN≤15V, V

OUT

= 5.00, I

OUT

= 0

1.00

6.00

7.00

10.00

mV

Load Regulation

0≤I

OUT

≤800mA, V

IN

= 4.25V, V

OUT

= 2.85

0≤I

OUT

≤800mA, V

IN

= 4.50V, V

OUT

= 3.00

0≤I

OUT

≤800mA, V

IN

= 4.80V, V

OUT

= 3.30

0≤I

OUT

≤800mA, V

IN

= 6.50V, V

OUT

= 5.00

1.00

10.00

12.00

15.00

mV

Dropout Voltage ( Note 2)

I

L

= 100mA

I

L

= 500mA

I

L

= 800mA

1.00

1.05

1.10

1.15

1.20

V

Quiescent Current

4.25V ≤VIN≤6.5V

5.00 10.00 mA

Current Limit

(VIN-V

OUT

) = 5V 1000 1200 mA

Thermal Regulation

25°C,30mS Pulse

0.01 0.1 %/W

Ripple Rejection

f

RIPPLE

= 120Hz, (Vin-V

OUT

) = 3V,

V

RIPPLE

= 1V

p-p

60 75 dB

Long Term Stability

125°C, 1000Hrs 0.03 %

RMS Output Noise

% of V

out

, 10Hz≤f≤10kHz

0.003 %

Thermal Resistance

Junction to case, at tab 15

°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 10µF (tantalum)or 50µF (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 0.5Ω. The output capacitance could increase in size to above the minimum value. The larger value of output capacitance as high as 100µF can improve the load transient response.

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 65°C of the soldering temperature range.

THERMAL CHARACTERISTICS

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. 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 - V

OUT

)(I

OUT

)

Maximum Junction Temperature range:

TJ = T

ambient

(max) + PD* thermal resistance (Junction-to-

ambient) Maximum Junction temperature must not exceed the 125°C.

10uF

+

Ω ..

27K

AS1117-2.85

+

10V

10uF

2.85V

50 X 50 mm

35 X 17 mm

16 X 10 mm

PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW

Fig. 1. Circuit Layout, Thermal Experiments.

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 TOPDIDE COPPER AREA BACKSIDE COPPER AREA THERMAL RESISTANCE

JUNCTION TO AMBIENT

2500mm 2500mm 2500mm 2500mm 2500mm 1600mm 2500mm 2500mm 1600mm 900mm 900mm

2500mm 1250mm 950mm 2500mm 1800mm 600mm 1250mm 915mm 600mm 240mm 240mm

2500mm 2500mm 2500mm 0 0 1600mm 0 0 0 900mm 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°°

LOAD

ADJ

ALPHA

AS1117

800mA Current output

V

IN

C

1

R

1

OUT

IN

OUT

I

ADJ

ALPHA

AS1117

C

1

R

1

R

2

V

OUT

Typical Adjustable Regulator

V

IN

C

2

V

OUT

= V

REF

(1+R2/R1) +I

ADJ R2

v

REF

50uA

ADJ

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)

0.103 BSC

0.050 (1.270)

0.600

+

-

0.025

0.405

0.005

0.055 (1.397)

(10.287 0.127)

± ±

0.356 0.005

(9.042 0.127)

±

(15.24

0.635)

±

(2.616)

0.032

+

-

0.001

(0.813 0.025)

+

-

0.176

0.005

0.050

0.002

0.015

+

-

0.003

0° 8°

(0.381 0.074)

+

-

0.100

0.010

(2.540 0.254)

±

(4.470

0.127)

±

(1.270

0.051)

±

± ±

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)

0.116

0.124

0.146

0.130

0.295

0.264

0.041

0.033

0.0905 NOM

0.181 NOM

0.264

0.248

0.0040

0.0008

0.033

0.025

0.146

0.130

10°

C Max

0.014

0.010

10°C

16°C

10°C

16°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)

0.408 ± 0.013

(10.36 ± 0.33)

0.110 ± 0.010

(2.794 ± 0.254)

0.250 ± 0.010

(6.350 ± 0.254)

0.151D ± 0.002

(3.835 D ± 0.051)

0.180 ± 0.005

(4.572 ± 0.127)

0.050 ± 0.002

(1.270 ± 0.051)

0.340 ± 0.010

(8.636 ± 0.254)

0.150 MIN (3.81 MIN)

0.410

(10.41)

0.100 ± 0.010

(2.540 ± 0.254)

0.032 ± 0.005

(0.813 ± 0.127)

0.540 ± 0.015

(13.720 ± 0.381)

0.050 TYP (1.27 TYP)

0.200 ± 0.010

(5.080 ± 0.254)

0.015 ± 0.010/-0.002

(0.381± 0.254/-0.051)

0.015 ± 0.010/-0.015

(2.667± 0.254/-0.381)

1.020 ± 0.015

(25.910 ± 0.381)

SEATING PLANE

Tapered 1

o

2 Sides

7o Typ.

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)

Pin 1

1.27 (0.50) BSC

3.8 (0.150)

4.0 (0.158)

4.6 (0.181)

5.2 (0.205)

5.8 (0.228)

6.2 (0.244)

4.8 (0.188)

5.0 (0.197)

0.49 (0.019)

0.56 (0.022)

0.35 (0.014)

0.45 (0.018)

0.10 (0.004)

0.20 (0.008)

0.19 (0.007)

0.22 (0.009)

1.35 (0.053)

1.75 (0.069)

0.61 (0.024)

0.78 (0.031)

3°-6°

0.64 (0.025)

0.77 (0.030)

45

°

7°(4 PLCS)

0.37 (0.015) BSC

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

1

2

3

P

K

F

G

D

B

STYLE 1

PIN 1. BASE

2. COLLECTOR

3. EMITTER

STYLE 3

PIN 1. GATE

2. ANODE

3. CATHODE

STYLE 2

PIN 1. ANODE

2. CATHODE

3. NO CONNECTION

PIN 1. DRAIN

2. GATE

3. SOURCE

STYLE 4

MILLIMETERS INCHESDIM

MIN MAX MIN MAX A 4.40 4.60 0.174 0.181 B 2.29 2.60 0.091 0.102 C 140 160 0.056 0.062 D 0.36 0.48 0.015 0.018 E 1.62 1.80 0.064 0.070 F 0.44 0.53 0.018 0.020 G

J 0.35 0.44 0.014 0.017

K 0.80 1.04 0.032 0.040

L 300 BSC 0.118 BSC N 2.04 2.28 0.081 0.089 P 3.94 4.25 0.156 0.167

150 BSC 0.059 BSC

-T-

N

C

J

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)

4

3

21

E b

2

-A-

L

2

D

L

3

L

1

b

1

e

-C-

e1

D

1

E

1

BACK VIEW A-A

TERM 4

C.010

M

A M

3 PLCS

-B-

A

1

C

1

c

8

A

SEATING PLANE

H

L

5. D1 & E1 Establishes A Minimum Mounting Surface for Terminal 4.

NOTES

1. Refer To Applicable Symbol List.

2. Dimensions And Tolerancing Per Ansi Y14.5m - 1982.

3. Lead Dimension Uncontrolled in L3.

4. Tab Contour Optional Within Dim. b2 & L2 And E1 & D

1

6. L is the Termal Length for Soldering.

7. Controlling Dimension: Inch

8. 2 Mils Suggested For Postive Contact At Mounting.

b

MIN MAX MIN MAX

A 0.086 0.094 2.184 2.3876

A1 0.035 0.045 0.889 1.143

b 0.025 0.035 0.635 0.889 b1 0.300 0.045 7.620 1.143 b2 0.205 0.215 5.207 5.461 4

c 0.018 0.023 0.457 0.5842 c1 0.018 0.023 0.457 0.5842

D 0.235 0.245 5.969 6.223 D1 0.170 - 4.318 - 4,5

E 0.250 0.265 6.350 6.731 E1 0.170 - 4.318 - 4,5

e e1

H 0.370 0.410 9.398 10.414

L 0.020 - 0.508 - 6 L1 0.025 0.040 0.635 1.016 L2 0.035 0.050 0.889 1.270 4 L3 0.045 0.060 1.143 1.524 3

4.572

S

Y

M B O

L

0.098

MM

2.489

0.180

N O T E

INCHES

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.