A1117AK3R-18 [AITSEMI]

BIPOLAR LDO REGULATOR 1A CURRENT LIMIT AND THERMAL PROTECTION;


型号：	A1117AK3R-18
厂家：	AiT Semiconductor
描述：	BIPOLAR LDO REGULATOR 1A CURRENT LIMIT AND THERMAL PROTECTION
文件：	总12页 (文件大小：426K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

DESCRIPTION

FEATURES

A1117A is a series of low dropout three-terminal

regulators with a typical dropout of 1.3V at 1A load

current.

⚫

Maximum output current is 1A

Range of operation input voltage: Max 15V

Line regulation: 0.1%/V (typ.)

Load regulation: 10mV (typ.)

Besides fixed voltage version (V_OUT= 1.2V, 1.8V,

2.5V, 3.3V, 5V), A1117A has an adjustable version

that can provide an output voltage from 1.25 to 12V

with two external resistors.

Environment Temperature: -20°C ~85°C

Available in SOT-223 , TO-252 and SOT89-3

packages

APPLICATION

A1117A offers thermal shut down functions to assure

stability of chip and power system. Trimming

technique is used to guarantee output voltage

accuracy within ±2%.

⚫

DVB

Computer Mother Board, Graphic Card

LCD Monitor and LCD TV

DVD Decode Board

The A1117A is available in SOT-223, TO-252 and

SOT89-3 packages.

ADSL Modem

Post Regulators for Switching Supplies

ORDERING INFORMATION

TYPICAL APPLICATION

Package Type

Part Number

A1117ANR-XX

A1117ANVR-XX

A1117ADR-XX

A1117ADVR-XX

A1117AK3R-XX

A1117AK3VR-XX

SOT-223

SPQ: 2,500pcs/Reel

TO-252

SPQ: 2,500pcs/Reel

SOT89-3

SPQ: 1,000pcs/Reel

XX: Output Voltage,

12=1.2V, 18=1.8V,

ADJ: Adjustable

V: Halogen free Package

R: Tape & Reel

Application circuit of A1117A fixed version

Note

AiT provides all RoHS products

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 1 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

PIN DESCIPTION

Top View

SOT89-3

Top View

TO-252

SOT-223

Pin #

A1117A -XX A1117A -ADJ A1117A -XX A1117A -ADJ A1117A -XX A1117A -ADJ

GND

V_OUT

V_IN

ADJ

V_OUT

V_IN

GND

V_OUT

V_IN

ADJ

V_OUT

V_IN

GND

V_OUT

V_IN

ADJ

V_OUT

V_IN

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 2 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

ABSOLUTE MAXIMUM RATINGS

Max Input Voltage

15V

150°C

T_J, Max Operating Junction Temperature

T_A, Ambient Temperature

-40°C ~ 85°C

20°C/W

SOT-223

TO-252

Package Thermal Resistance

10°C/W

T_S, Storage Temperature

Lead Temperature & Time

-40°C ~ 150°C

260°C, 10s

Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and

operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not

implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

RECOMMENDED WORKING CONDITIONS

Parameter

Input Voltage Range

Operating Junction Temperature

Symbol

T_J

Value

Max. 12

-20 ~ 125

Units

°C

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 3 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

ELECTRICAL CHARACTERISTICS

T_J= 25°C

Parameter

Reference Voltage

Symbol

V_REF

Conditions

Min.

Typ.

1.25

1.2

1.8

2.5

3.3

Max.

1.275

1.224

1.836

2.55

Unit

10mA≤I_OUT≤1A , V_IN=3.25V ADJ 1.225

0≤I_OUT≤1A , V_IN=3.2V

0≤I_OUT≤1A , V_IN=3.8V

0≤I_OUT≤1A , V_IN=4.5V

0≤I_OUT≤1A , V_IN=5.3V

0≤I_OUT≤1A , V_IN=7.0V

1.2V 1.176

1.8V 1.764

2.45

3.3V 3.234

Output Voltage

Line Regulation

V_OUT

2.5V

3.366

5.1

5.0V

4.9

I_OUT=10mA, 2.75V≤V_IN≤12V ADJ

I_OUT=10mA, 2.7V≤V_IN≤10V

I_OUT=10mA, 3.3V≤V_IN≤12V

I_OUT=10mA, 4.0V≤V_IN≤12V

I_OUT=10mA, 4.8V≤V_IN≤12V

I_OUT=10mA, 6.5V≤V_IN≤12V

1.2V

1.8V

2.5V

3.3V

5.0V

ΔV_OUT

0.1

0.2

%/V

V_IN=2.75V, 10mA≤I_OUT≤1A ADJ

V_IN=2.7V, 10mA≤I_OUT≤1A

V_IN=3.3V, 10mA≤I_OUT≤1A

V_IN=4.0V, 10mA≤I_OUT≤1A

V_IN=4.8V, 10mA≤I_OUT≤1A

V_IN=6.5V, 10mA≤I_OUT≤1A

I_OUT=100mA

1.2V

1.8V

2.5V

3.3V

5.0V

Load Regulation

Dropout Voltage

ΔV_OUT

1.23

1.3

1.5

V_DROP

I_OUT=1A

Current Limit

Minimum Load Current

Ilimit

Imin

V_IN-V_OUT=2V, T_J=25°C

ADJ

1.2V

1.8V

2.5V

3.3V

5.0V

ADJ

V_IN=10V

V_IN=12V

V_IN=5V, 10mA≤I_OUT≤1A

Quiescent Current

I_q

3.5

Adjust Pin Current

I_ADJchange

I_ADJ

0.2

120

μA

I_CHANGEV_IN=5V, 10mA≤I_OUT≤1A

Temperature

Coefficient

ΔV/ΔT

±100

ppm

SOT-223

Thermal Resistor

θ_JC

^oC/W

TO-252

SOT-89-3

NOTE1: All test are conducted under ambient temperature 25°C and within a short period of time 20ms

NOTE2: Load current smaller than minimum load current of A1117A-ADJ will lead to unstable or oscillation output.

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 4 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

TYPICAL PERFORMANCE CHARACTERISTICS

T=25°C, unless specified.

Line Regulation

Load Regulation

A1117A-ADJ V_OUTVs. I_OUT

A1117A-ADJ V_OUTVs. V_IN

Dropout Voltage

A1117A-ADJ Dropout Vs. I_OUT

Thermal performance with OTP

A1117A-ADJ V_OUTVs. Temp

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 5 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

BLOCK DIAGRAM

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 6 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

DETAILED DESCRIPTION

A1117A is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple: the

fixed version only needs two capacitors and the adjustable version only needs two resistors and two

capacitors to work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal

shutdown, current limit, power transistors and its driver circuit and so on.

The thermal shut down modules can assure chip and its application system working safety when the junction

temperature is larger than 140°C.

The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by

careful design considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output

voltage is guaranteed by trimming technique.

TYPICAL APPLICATION

A1117A has an adjustable version and fixed versions (1.2V, 1.8V, 2.5V, 3.3V and 5V)

Fixed Output Voltage Version

Application circuit of A1117A fixed version

Recommend using 10uF tan capacitor as bypass capacitor for all application circuit.

Recommend using 10uF tan capacitor to assure circuit stability.

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 7 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

Adjustable Output Voltage Version

A1117A-ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable

by choosing two external resistors (schematic is shown below), R1 and R2

Application Circuit of A1117A-ADJ

The output voltage of adjustable version follows the equation: V_OUT=1.25 x (1+R2/R1) + I_ADJx R2. We can

ignore I_ADJbecause I_ADJ(about 50uA) is much less than the current of R1 (about 2~10mA).

To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125Ω or lower. As

A1117A-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625Ω.

Using a bypass capacitor (C_ADJ) between the ADJ pin and ground can improve ripple rejection. This

bypass capacitor prevents ripple from being amplified as the output voltage is increased. The

impedance of C_ADJshould be less than R1 to prevent ripple from being amplified. As R1 is normally in

the range of 100Ω~500Ω, the value of C_ADJshould satisfy this equation: 1/(2 x f_ripplex C_ADJ)<R1.

THERMAL CONSIDERATIONS

We have to take heat dissipation into great consideration when output current or differential voltage of input

and output voltage is large. Because in such cases, the power dissipation consumed by A1117A is very large.

A1117A series uses SOT-223 package type and its thermal resistance is about 20°C/W. And the copper area

of application board can affect the total thermal resistance. If copper area is 5cm*5cm (two sides), the

resistance is about 30°C/W. So the total thermal resistance is about 20°C/W + 30°C/W. We can decrease

total thermal resistance by increasing copper area in application board. When there is no good heat

dissipation copper are in PCB, the total thermal resistance will be as high as 120°C/W, then the power

dissipation of A1117A could allow on itself is less than 1W. And furthermore, A1117A will work at junction

temperature higher than 125°C under such condition and no lifetime is guaranteed.

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 8 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

PACKAGE INFORMATION

Dimension in SOT-223 (Unit: mm)

Symbol

Min

Max

1.80

0.10

1.70

1.00

0.80

0.76

3.09

3.05

0.35

0.31

6.58

6.65

7.05

Symbol

Min

6.80

3.40

3.33

Max

7.20

3.60

3.53

0.02

1.50

0.80

0.67

0.66

2.96

2.95

0.30

0.29

6.48

6.55

2.30BSC

4.60BSC

0.80

1.20

1.75REF

0.25BSC

0.10

0°

θ1

8°

14°

10°

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 9 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

Dimension in TO-252 Package (Unit: mm)

Symbol

Min

2.20

0.00

0.90

0.77

0.76

0.77

5.23

0.47

0.46

0.47

6.00

5.25

Max

2.38

0.10

1.10

0.89

0.86

1.10

5.43

0.60

0.56

0.60

6.20

Symbol

Min

6.50

4.70

Max

6.70

2.28BSC

9.80

1.40

10.40

1.70

2.90REF

0.51BSC

0.90

1.25

1.50

1.80REF

0°

3°

1°

8°

7°

5°

θ1

θ2

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 10 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

Dimension in SOT89-3 (Unit: mm)

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 11 -

A1117A

BIPOLAR LDO REGULATOR

AiT Semiconductor Inc.

www.ait-ic.com

1A CURRENT LIMIT AND THERMAL PROTECTION

IMPORTANT NOTICE

AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to

discontinue any integrated circuit product or service without notice, and advises its customers to obtain the

latest version of relevant information to verify, before placing orders, that the information being relied on is

current.

AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to

be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT

products in such applications is understood to be fully at the risk of the customer. As used herein may involve

potential risks of death, personal injury, or servere property, or environmental damage. In order to minimize

risks associated with the customer's applications, the customer should provide adequate design and

operating safeguards.

AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT

warrants the performance of its products of the specifications applicable at the time of sale.

REV3.2

- JUL 2010 RELEASED, JUN 2020 UPDATED -

- 12 -

A1117AK3R-18 [AITSEMI]

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