A1117ADVR-18 [AITSEMI]
BIPOLAR LDO REGULATOR 1A CURRENT LIMIT AND THERMAL PROTECTION;型号: | A1117ADVR-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 (VOUT = 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
N
D
K3
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
Top View
SOT89-3
Top View
TO-252
SOT-223
Pin #
A1117A -XX A1117A -ADJ A1117A -XX A1117A -ADJ A1117A -XX A1117A -ADJ
1
2
3
GND
VOUT
VIN
ADJ
VOUT
VIN
GND
VOUT
VIN
ADJ
VOUT
VIN
GND
VOUT
VIN
ADJ
VOUT
VIN
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
TJ, Max Operating Junction Temperature
TA, Ambient Temperature
-40°C ~ 85°C
20°C/W
SOT-223
TO-252
Package Thermal Resistance
10°C/W
TS, 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
TJ
Value
Max. 12
-20 ~ 125
Units
V
°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
TJ = 25°C
Parameter
Reference Voltage
Symbol
VREF
Conditions
Min.
Typ.
1.25
1.2
1.8
2.5
3.3
5
Max.
1.275
1.224
1.836
2.55
Unit
V
10mA≤IOUT≤1A , VIN=3.25V ADJ 1.225
0≤IOUT≤1A , VIN=3.2V
0≤IOUT≤1A , VIN=3.8V
0≤IOUT≤1A , VIN=4.5V
0≤IOUT≤1A , VIN=5.3V
0≤IOUT≤1A , VIN=7.0V
1.2V 1.176
1.8V 1.764
2.45
3.3V 3.234
Output Voltage
Line Regulation
VOUT
2.5V
V
3.366
5.1
5.0V
4.9
-
IOUT=10mA, 2.75V≤VIN≤12V ADJ
IOUT=10mA, 2.7V≤VIN≤10V
IOUT=10mA, 3.3V≤VIN≤12V
IOUT=10mA, 4.0V≤VIN≤12V
IOUT=10mA, 4.8V≤VIN≤12V
IOUT=10mA, 6.5V≤VIN≤12V
1.2V
1.8V
2.5V
3.3V
5.0V
ΔVOUT
0.1
10
0.2
30
%/V
VIN =2.75V, 10mA≤IOUT≤1A ADJ
VIN =2.7V, 10mA≤IOUT≤1A
VIN=3.3V, 10mA≤IOUT≤1A
VIN=4.0V, 10mA≤IOUT≤1A
VIN=4.8V, 10mA≤IOUT≤1A
VIN=6.5V, 10mA≤IOUT≤1A
IOUT=100mA
1.2V
1.8V
2.5V
3.3V
5.0V
Load Regulation
Dropout Voltage
ΔVOUT
-
mV
V
-
-
1
-
1.23
1.3
-
1.3
1.5
-
VDROP
IOUT=1A
Current Limit
Minimum Load Current
Ilimit
Imin
VIN-VOUT=2V, TJ=25°C
A
mA
ADJ
1.2V
1.8V
2.5V
3.3V
5.0V
ADJ
ADJ
2
10
VIN =10V
VIN =12V
VIN =12V
VIN =12V
VIN =12V
VIN =5V, 10mA≤IOUT≤1A
Quiescent Current
Iq
-
2
3.5
mA
Adjust Pin Current
IADJ change
IADJ
-
-
55
0.2
120
10
μA
μA
ICHANGE VIN =5V, 10mA≤IOUT≤1A
Temperature
Coefficient
ΔV/ΔT
-
-
±100
-
-
ppm
SOT-223
20
Thermal Resistor
θJC
oC/W
TO-252
-
-
10
40
-
-
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.
1.
Line Regulation
2.
Load Regulation
A1117A-ADJ VOUT Vs. IOUT
A1117A-ADJ VOUT Vs. VIN
3.
Dropout Voltage
A1117A-ADJ Dropout Vs. IOUT
4.
Thermal performance with OTP
A1117A-ADJ VOUT Vs. 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
1.
2.
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: VOUT =1.25 x (1+R2/R1) + IADJ x R2. We can
ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (about 2~10mA).
1.
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 (CADJ) 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 CADJ should be less than R1 to prevent ripple from being amplified. As R1 is normally in
the range of 100Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2 x fripple x CADJ)<R1.
2.
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
A
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
E
Min
6.80
3.40
3.33
Max
7.20
3.60
3.53
A1
A2
A3
b
b1
b2
b3
c
c1
D
D1
D2
0.02
1.50
0.80
0.67
0.66
2.96
2.95
0.30
0.29
6.48
6.55
-
E1
E2
e
e1
L
L1
L2
R
2.30BSC
4.60BSC
0.80
1.20
1.75REF
0.25BSC
0.10
0.10
0°
-
-
R1
θ
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
A
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
E
Min
6.50
4.70
Max
6.70
-
A1
A2
b
b1
b2
b3
c
E1
e
H
L
L1
L2
L3
L5
L6
θ
2.28BSC
9.80
1.40
10.40
1.70
2.90REF
0.51BSC
0.90
0.90
1.25
1.50
c1
c2
D
1.80REF
0°
3°
1°
8°
7°
5°
D1
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 -
相关型号:
©2020 ICPDF网 联系我们和版权申明