FEATURES

Active Low Shutdown Control.

Very Low Quiescent Current.

Very Low Dropout Voltage of 470mV at 300mA

Output Current (3.0V Output Version)

1.3V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V Output

Voltage.

Short Circuit and Thermal Protection.

±2% Output Tolerance.

Miniature Package: SOT-23-5 and SOT-89-5

APPLICATIONS

PDA

DSC

Notebook

Pagers

Personal Communication Equipment

Cordless Telephones

Portable Instrumentation

Portable Consumer Equipment

Battery Powered Systems

AIC1731

300mA, Low Dropout Linear Regulator with Shutdown

DESCRIPTION

AIC1731 is a 300mA low noise, low dropout linear regulator, and is housed in small SOT-23-5 and SOT-89-5 package. The device is in the “ON” state when the SHDN pin is set to logic high level. An internal P-MOSFET pass transistor is used to achieve 470mV low dropout voltage at

300mA load current. It offers high precision output voltage of

±2%. The quality of low quiescent current and low dropout voltage makes this device ideal for battery power applications.

The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. The high ripple rejection and low noise of

AIC1731 provide enhanced performance for critical applications. The noise bypass pin can be connected an external capacitor to reduce the output noise level.

TYPICAL APPLICATION CIRCUIT

V

IN

C

IN

1 µF

+

VIN

GND

VOUT

SHDN

SHDN

AIC1731

BP

C

BP

0.1

µF

+

C

OUT

1 µF

(Note1)

V

OUT

Low Noise Low Dropout Linear Regulator

Analog Integrations Corporation

Si-Soft Research Center

3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.

TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw

DS-1731G-01 120408

1

AIC1731

ORDERING INFORMATION

AIC1731-XXXXXX

PIN CONFIGURATION

PACKING TYPE

TR: TAPE & REEL

BG: BAG

PACKAGE TYPE

V: SOT-23-5

X5: SOT-89-5

P: LEAD FREE COMMERCIAL

G: GREEN PACKAGE

SOT-23-5

TOP VIEW

1: VIN

2: GND

3: SHDN

4: BP

5: VOUT

OUTPUT VOLTAGE

1.3V

15:

18:

25:

2.8V

30:

3.3V

SOT-89-5

TOP VIEW

1: VIN

2: GND

3: SHDN

4: BP

5: VOUT

(Of a unit of 0.1V within the voltage range from 1.3V to 3.3V, additional voltage versions for this product line may be available on demand with prior consultation with AIC.)

Example: AIC1731-18PX5TR

1.8V Version, in SOT-89-5 Lead Free Package & Tape &

Reel Packing Type

AIC1731-18PVTR

1.8V Version, in SOT-23-5 Lead Free Package & Tape &

Reel Packing Type

•

SOT-89-5 Marking

Part No. Marking Part No.

AIC1731-13CX5 EH13 AIC1731-13PX5

AIC1731-15CX5 EH15 AIC1731-15PX5

AIC1731-18CX5 EH18 AIC1731-18PX5

AIC1731-25CX5 EH25 AIC1731-25PX5

AIC1731-28CX5 EH28 AIC1731-28PX5

AIC1731-30CX5 EH30 AIC1731-30PX5

5

1

5

1 2

4

3

4

2 3

Marking Part No. Marking

EH13P AIC1731-13GX5 EH13G

EH15P AIC1731-15GX5 EH15G

EH18P AIC1731-18GX5 EH18G

EH25P AIC1731-25GX5 EH25G

EH28P AIC1731-28GX5 EH28G

EH30P AIC1731-30GX5 EH30G

•

AIC1731-33CX5 EH33 AIC1731-33PX5

SOT-23-5 Marking

Part No. Marking Part No.

EH33P AIC1731-33GX5 EH33G

Marking Part No. Marking

AIC1731-13CV ED13 AIC1731-13PV ED13P AIC1731-13GV ED13G

AIC1731-15CV ED15 AIC1731-15PV ED15P AIC1731-15GV ED15G

AIC1731-18CV ED18 AIC1731-18PV ED18P AIC1731-18GV ED18G

AIC1731-25CV ED25 AIC1731-25PV ED25P AIC1731-25GV ED25G

AIC1731-28CV ED28 AIC1731-28PV ED28P AIC1731-28GV ED28G

AIC1731-30CV ED30 AIC1731-30PV ED30P AIC1731-30GV ED30G

AIC1731-33CV ED33 AIC1731-33PV ED33P AIC1731-33GV ED33G

2

AIC1731

ABSOLUTE MAXIMUM RATINGS

Supply Voltage

Shutdown Terminal Voltage

Noise Bypass Terminal Voltage

Operating Temperature Range

Maximum Junction Temperature

Storage Temperature Range

Lead Temperature (Soldering, 10 sec)

Thermal Resistance Junction to Case, R

θ

JC

SOT-23-5

Thermal Resistance Junction to Ambient, R

θ

JA

SOT-23-5

12V

8V

5V

-40ºC~85ºC

125

°C

-65ºC~150ºC

260

°C

130

°C /W

220

°C /W

(Assume no ambient airflow, no heatsink)

Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

TEST CIRCUIT

Refer to TYPICAL APPLICATION CIRCUIT

3

AIC1731

ELECTRICAL CHARACTERISTICS

(C

IN

=1

µF, C

OUT

=4.7

µF, T

J

=25

°C, unless otherwise specified) (Note2)

PARAMETER

Quiescent Current

Standby Current

GND Pin Current

Continuous Output Current

Output Current Limit

Output Voltage Tolerance

Temperature Coefficient

V

IN

= 5V, V

OUT

= 0V

V

IN

= 5V, no load

Line Regulation

Load Regulation

Dropout Voltage

Noise Bypass Terminal Voltage

V

IN

= V

OUT(TYP)

+ 1V to 7V

V

IN

= V

OUT

+ 1.2V (Vout≥ 2.0V)

V

IN

= V

OUT

+ 1.7V (Vout≤ 1.9V)

I

OUT

= 0.1~300mA

I

L

=300mA

3.0V

≤V

OUT

≤3.3V

2.5V

≤V

OUT

≤2.9V

2.0V

≤V

OUT

≤2.4V

1.3V

≤V

OUT

≤1.9V

Output Noise

I

OUT

= 0mA, V

V

IN

IN

= 3.6~7V

= 3.6~7V, output OFF

I

OUT

V

IN

TEST CONDITIONS

= 0.1~300mA

= 5V

C

BP

= 0.1

µF, f = 1KHz,V

IN

= 5V

SYMBOL MIN. TYP. MAX.

UNIT

I

Q

I

STBY

I

GND

35 50

µA

30 50

µA

I

OUT

300 mA

300 450 mA I

IL

V

OUT

TC

∆V

LIR

-2 2 %

50 150 ppm/ºC

∆V

V

V

LOR

DROP

REF

10 30 mV

470

570

800

1260

870

970

1200

1660 mV

1.23 V

µ

V

Hz

Ripple Rejection

Shutdown Pin Current

Shutdown Pin Voltage (ON) f = 1KHz, Ripple = 0.5V

P-P

,

C

BP

= 0.1

µF

Output ON

Shutdown Pin Voltage (OFF) Output OFF

Shutdown Exit Delay Time

C

BP

=0.1

µF, C

OUT

=1

µF,

I

OUT

=30mA

Thermal Shutdown Temperature

RR 55 dB

I

SHDN

0.1

µA

1.6 V

0.6 V

T

SD

µS

155 ºC

Note 1:

To avoid output oscillation, aluminum electrolytic output capacitor is recommended and ceramic capacitor is not suggested.

Note 2:

Specifications are production tested at T

A

=25

°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with Statistical Quality

Controls (SQC).

4

AIC1731

TYPICAL PERFORMANCE CHARACTERISTICS

60 700

AIC1731-33

50

1.5V

600

40

3.3V

500

400

30

300

20

200

10

0

0 1 2 3

V

IN

4

(V)

5

Fig. 1 Quiescent Current vs. V

IN

6 7

100

0

0 50

T

A

=50

°C

T

A

=80

°C

T

A

=20

°C

T

A

=-40

°C

100 150 200 250 300

I

LOAD

(mA)

Fig. 2 V

DROP

vs. I

LOAD

42.0

41.5

41.0

40.5

40.0

39.5

39.0

44.0

43.5

43.0

42.5

0

1.5V

3.3V

V

IN

=6V

T

A

=25

°C

50 100 150 200 250

I

LOAD

(mA)

Fig. 3 Ground Current vs. I

LOAD

300

45

AIC1731-33

44

43

300mA

42

41

40

30mA

150mA

800

700

600

500

400

300

200

100

0

0

46

44

42

40

38

1 2 3 4

Input Voltage (V)

5 6 7

Fig. 4 Input Voltage vs. Short Circuit Current

1.5V

3.3V

3.3V

1.5V

39

-40 -20 0 20 40 60 80 100

Temperature (

°C)

Fig. 5 Ground Current vs. Temperature

36

-40

V

IN

=5V

-20 0 20 40 60 80 100

Temperature (

°C)

Fig. 6 Quiescent Current vs Temperature

5

AIC1731

TYPICAL PERFORMANCE CHARACTERISTICS

(Continued)

3.50

3.45

AIC1731-33

3.40

640

620

600

3.35

580

3.30

3.25

560

540

V

IN

=6V

V

IN

=5V

3.20

520

3.15

V

IN

=5V

3.10

-40 -20 0 20 40 60 80 100

Temperature (

°C)

Fig. 7 Output Voltage vs. Temperature

500

V

IN

=7V

-20 0 20 40 60 80 100

Temperature (

°C)

Fig. 8 Current Limit vs. Temperature

1.30

AIC1731-15

1.25

1.20

T

A

=-40 o

C

1.15

T

A

=20 o

1.10 T

A

=50 o

C

1.05

T

A

=85 o

C

1.00

0 50 100 150

I

OUT

(mA)

200

Fig. 9 V

DROP

vs. I

LOAD

250 300

150

100

50

0

0

500

450

400

AIC1731-25

350

300

250

200

50

T

A

=50 o

C

100 150

I

OUT

(mA)

200

Fig. 10 V

DROP

vs. I

LOAD

T

A

=85 o

C

T

A

=20 o

T

A

=-40 o

C

C

250 300

V

OUT

C

BP

=0.1

µF

C

OUT

=4.7

µF

V

OUT

C

BP

=0.1

µF

C

OUT

=1

µF

I

OUT=180mA

I

OUT=180mA

I

OUT=120mA

I

OUT=120mA

Fig. 11 Load Transient Response Fig. 12 Load Transient Response

6

TYPICAL PERFORMANCE CHARACTERISTICS

(Continued)

AIC1731

Vin=V

OUT

+1

Vin=V

OUT

+2V

Vin=V

OUT

+1V

Vin=V

OUT

+2V

V

OUT

=3.3V

C

IN

=1

µF, C

OUT

=1

µF

C

BP

=0.1

µF

Iout=50mA

Fig. 13 Line Transient Response

Vin=Vout+1V

V

IN

=Vout+2V

V

OUT

=3.3V

C

IN

=1

µF, C

OUT

=4.7

µF

C

BP

=0.1

µF

Iout=50mA

Fig. 14 Line Transient Response

V

IN

=Vout+1V

V

IN

=Vout+2V

V

OUT

=1.5V

C

IN

=1

µF, C

OUT

=1

µF

C

BP

=0.1

µF

Iout=50mA

Fig. 15 Line Transient Response

I

OUT

=30mA

C

BP

=0.1

µF

C

OUT

=1

µF

V

OUT

V

SHDN

Fig. 17 Shutdown Exit Time

-10

0

V

OUT

=1.5V

C

IN

=1

µF, C

OUT

=4.7

µF

C

BP

=0.1

µF

Iout=50mA

Fig. 16 Line Transient Response

C

OUT

=1uF ; C

BP

=0.1uF

-20

-30

-40

I

L

=100mA

I

L

=300mA

-50

I

L

=30mA

-60

10

I

L

=100mA

100 1000 10000 100000

Frequency(Hz)

Fig. 18 Ripple Rejection

1000000 1E7

7

BLOCK DIAGRAM

VIN

AIC1731

Current

Limiting

BP

SHDN

V

REF

1.23V

Power

Shutdown

GND

PIN DESCRIPTIONS

PIN 1 : VIN - Power supply input pin. Bypass with a 1

µF capacitor to GND

PIN 2 : GND - Ground pin.

PIN 3 : SHDN - Active-Low shutdown input pin.

-

+

Error

Amp.

Thermal

Limiting

VOUT

PIN 4 : BP - Noise bypass pin. An external bypass capacitor connected to

BP pin reduces noises at the output.

PIN 5 : VOUT - Output pin. Sources up to 300 mA.

8

AIC1731

DETAILED DESCRIPTIONS OF TECHNICAL TERMS

DROPOUT VOLTAGE (V

DROP

)

The dropout voltage is defined as the difference between the input voltage and output voltage at which the output voltage drops 100mV. Below this value, the output voltage will fall as the input voltage reduces. It depends on the load current and junction temperature. is specified by the output current ranging from

0.1mA to 300mA.

CURRENT LIMIT (I

IL

)

AIC1731 includes a current limiting, which monitors and controls the maximum output current if the output is shorted to ground. This can protect the device from being damaged.

LINE REGULATION

Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage changes from V

IN

= V

OUT

+

1V to V

IN

= 7V and I

OUT

= 1mA.

LOAD REGULATION

Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes.

A pulsed measurement with an input voltage set to V

IN

= V

OUT

+ V

DROP can minimize temperature effects.

The load regulation

THERMAL PROTECTION

Thermal sensor protects device when the junction temperature exceeds T

J

= +155ºC. It signals shutdown logic, turning off pass transistor and allowing IC to cool down. After the IC’s junction temperature cools by 15ºC, the thermal sensor will turn the pass transistor back on.

Thermal protection is designed to protect the device in the event of fault conditions. For a continuous operation, do not exceed the absolute maximum junction-temperature rating of T

J

=

150ºC, or damage may occur to the device.

APPLICATION INFORMATION

INPUT-OUTPUT CAPACITORS

Linear regulators require input and output capacitors to maintain stability. Input capacitor at

1

µF with a 1uF aluminum electrolytic output capacitor is suggested.

NOISE BYPASS CAPACITOR

0.1

µF bypass capacitor at BP pin reduces output voltage noise. And the BP pin has to connect a capacitor to GND.

POWER DISSIPATION

The AIC1731 obtains thermal-limiting circuitry, which is designed to protect the device against overload condition. For continuous load condition, maximum rating of junction temperature must not be exceeded. It is important to pay more attention in thermal resistance. It includes junction to case, junction to ambient. The maximum power dissipation of

AIC1731 depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature.

When the IC mounting with good thermal conductivity is used, the junction temperature will be low even when large power dissipation applies.

The power dissipation across the device is

P = I

OUT

(V

IN

-V

OUT

).

9

The maximum power dissipation is:

P

MAX

=

(T

J max

-

Rθ

JA

T

A

)

Where T

J-max

is the maximum allowable junction temperature (125

°C), and T

A

is the ambient temperature suitable in application.

As a general rule, the lower temperature is, the better reliability of the device is. So the PCB

AIC1731

mounting pad should provide maximum thermal conductivity to maintain low device temperature.

GND pin performs a dual function for providing an electrical connection to ground and channeling heat away. Therefore, connecting the GND pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature.

10

PHYSICAL DIMENSIONS

(unit: mm)

SOT-89-5

D

D1 e 1 e

A

C

D1

E e e 1

H

L

B

C

D

A

M

B

S

Y

O

L

AIC1731

MIN.

1 .4 0

0 .3 6

0 .3 5

4 .4 0

1 .5 0

2 .2 9

S O T-8 9 -5

MILLIME TE R S

1 .5 0 BS C

3 .0 0 BS C

3 .9 4

0 .8 0

MAX.

1 .6 0

0 .5 6

0 .4 4

4 .6 0

1 .8 3

2 .6 0

4 .2 5

1 .2 0

B

Note : 1. Re fe r to J EDEC TO-243AA.

2. Dime ns ion "D" does not include mold flas h, protrus ions

or ga te burrs . Mold fla s h, protrus ion or ga te burrs shall not

excee d 6 mil per side.

3. Dime ns ion "E" doe s not include inte r-lea d flash or protrus ions.

4. Controlling dimens ion is millime te r, converted inch

dime ns ions are not neces s arily exact.

11

AIC1731

SOT-23-5

A

D

A e1 e

SEE VIEW B

WITH PLATING b

BASE METAL

SECTION A-A

D

E

E1 e e1 b c

A

S

Y

M

B

O

L

A1

A2

L

L1

θ

MIN.

0.95

0.05

0.90

0.30

0.08

2.80

2.60

1.50

SOT-25

MILLIMETERS

0.95 BSC

1.90 BSC

0.30

0.60 REF

0°

MAX.

1.

45

0.15

1.30

0.50

0.22

3.00

3.00

1.70

0.60

8°

L

L1

VIEW B

θ

GAUGE PLANE

SEATING PLANE

Note : 1. Re fe r to J EDEC MO-178AA.

2. Dim e ns ion "D" doe s not include m old fla s h, protru s ions

or ga te burrs . Mold fla s h, protrus ion or ga te bu rrs s ha ll not

e xce e d 10 m il pe r s ide .

3. Dim e ns ion "E1" doe s not include inte r-le a d fla s h or protrus ions .

4. Controlling dim e ns ion is m illim e te r, conve rte d in ch

dim e ns ions a re not ne ce s s a rily e xa ct.

Note:

Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice.

Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.

12