A1084S3R-ADJ [AITSEMI]
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR;型号: | A1084S3R-ADJ |
厂家: | AiT Semiconductor |
描述: | 5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR |
文件: | 总12页 (文件大小:555K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
DESCRIPTION
FEATURES
ꢀ
Provide Fixed Version and an Adjustable
Version, Output Value can be customized on
command.
The A1084 is a series of low dropout three terminal
regulators with a dropout of 1.4V at 5A load current.
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Maximum Output Current: 5A
Other than a fixed version (VOUT = 1.8V, 2.5V, 3.3V,
5V), The A1084 has an adjustable version, which
can set the output voltage with two external
resistors.
Range of Operation Input Voltage: Max 15V
Line Regulation: 0.2% (Typ.)
Load Regulation: 0.2% (Typ.)
Environment Temperature: 0oC to +80oC
Available in TO-252, TO-263-2 and TO-263-3
Package
The A1084 offers thermal shutdown and current limit
functions, to assure the stability of chip and power
system.
APPLICATION
ꢀ
Power Management for Computer Mother
Board, Graphic Card
The A1084 is available in TO-252, TO-263-2 and
TO-263-3 package.
ꢀ
ꢀ
ꢀ
Battery Charger
Microprocessor Supply
Post Regulators for Switching Supplies
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
TO-252
Part Number
A1084DR-XX
D
A1084DVR-XX
A1084S2R-XX
A1084S2VR-XX
A1084S3R-XX
A1084S3VR-XX
TO-263-2
TO-263-3
S2
S3
Adjustable Version
VOUT = VREF x (1 + R2 / R1) + IADJ x R2
XX: Output Voltage,
33 = 3.3V, 50 = 5V,
ADJ: Adjustable
Note
R : Tape & Reel
V: Green Package
Fixed Output Version
AiT provides all Pb free products
Suffix “ V “ means Green Package
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 1 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
PIN DESCIPTION
Top View
Top View
Top View
TO-252
TO-263-2
TO-263-3
Pin
#
A1084DR-XX
A1084DR-ADJ
ADJ
A1084S2R-XX
A1084S2R-ADJ
ADJ
A1084S3R-XX
A1084S3R-ADJ
ADJ
1
GND
VOUT
VIN
GND
VOUT
VIN
GND
VOUT
VIN
2
VOUT
VOUT
VOUT
3
VIN
VIN
VIN
ABSOLUTE MAXIMUM RATINGS
Maximum Input Voltage
15V
150oC
Junction Temperature (TJ)
Environment Temperature (TA)
Storage Temperature (Ts)
Lead Temperature and Time
80oC
-65oC to 150oC
260oC, 10S
Stresses above may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at
these or any other conditions beyond those indicated in the Electrical Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 2 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
ELECTRICAL CHARACTERISTICS
Test Condition: CIN=10uF, COUT=22uF, TA = 25oC, unless otherwise noted.
Symbol
Parameter
Reference
Conditions
Min.
Typ.
Max. Unit
I
OUT = 10mA, VIN − VOUT = 3V
1.238 1.25 1.262
1.225 1.25 1.275
1.782 1.80 1.818
1.764 1.80 1.836
2.475 2.50 2.525
2.450 2.50 2.550
VREF
V
V
Voltage
10mA ≤ IOUT ≤ 5A, 1.5V ≤ VIN − VOUT ≤ 5V
IOUT = 0mA, VIN = 4.8V, TJ = 25oC
1.8V
10mA ≤ IOUT ≤ 5A, 3.4V ≤ VIN ≤ 7V
IOUT = 0mA, VIN = 5.5V, TJ = 25oC
2.5V
V
10mA ≤ IOUT ≤ 5A, 4.1V ≤ VIN ≤ 7V
VOUT
Output Voltage
IOUT = 0mA, VIN = 6.3V, TJ = 25oC
3.3V
3.267
3.234
4.95
3.3
3.3
5.0
5.0
3.333
3.366
5.05
V
10mA ≤ IOUT ≤ 5A, 4.9V ≤ VIN ≤ 8V
IOUT = 0mA, VIN = 8.0V, TJ = 25oC
5.0V
V
10mA ≤ IOUT ≤ 5A, 6.6V ≤ VIN ≤ 10V
4.90
5.10
ADJ IOUT = 10mA, 2.85V ≤ VIN ≤ 12V
1.8V IOUT = 10mA, 3.4V ≤ VIN ≤ 12V
2.5V IOUT = 10mA, 4.1V ≤ VIN ≤ 12V
3.3V IOUT = 10mA, 4.9V ≤ VIN ≤ 12V
0.035
0.2
15
15
15
%
7
7
7
mV
mV
mV
Line Regulation
(Note1)
ΔVOUT
5.0V IOUT = 10mA, 6.6V ≤ VIN ≤ 12V
ADJ VIN − VOUT = 3V, 10mA ≤ IOUT ≤ 5A
1.8V VIN − VOUT = 3V, 0mA ≤ IOUT ≤ 5A
7
15
0.4
30
mV
%
0.2
16
mV
Load Regulation
(Note1, 2)
2.5V VIN − VOUT = 3V, 0mA ≤ IOUT ≤ 5A
3.3V VIN − VOUT = 3V, 0mA ≤ IOUT ≤ 5A
5.0V VIN − VOUT = 3V, 0mA ≤ IOUT ≤ 5A
16
16
16
30
30
30
mV
mV
mV
ΔVOUT
Dropout Voltage
(Note 3)
VIN −VOUT
ΔVOUT, ΔVREF = 1%, IOUT = 5A
1.4
V
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 3 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Symbol
Parameter
Conditions
IN − VOUT = 3V, TJ = 25oC
Min. Typ. Max. Unit
Current Limit
V
7.0
3
A
mA
mA
uA
ILIMIT
Minimum Load
A1084-ADJ
10
10
Current (Note 4)
Iq
Quiescent Current VIN = 10V
5
Adjustable Version
IADJ
Adjust Pin Current
45
110
VIN = 4.25V, IOUT = 10mA
F = 120Hz, COUT = 25uF (Tan)
IOUT = 5A, VIN − VOUT = 3V
Ripple Rejection
60
dB
Adjust Pin Current 10mA ≤ IOUT ≤ 5A,
ICHANGE
0.2
5
uA
Change
1.5V ≤ VIN − VOUT ≤ 6V
IOUT = 10mA,
Temperature Stability
0.5
%
VIN − VOUT = 1.5V
TO-252
Thermal Resistance
Junction to Case
12.5
3
ΘJC
oC/W
TO-263-2 and TO-263-3
Note 1: The Parameters of Line Regulation and Load Regulation are tested under constant junction temperature.
Note 2: When IOUT varies between 0 to 5A, VIN – VOUT varies between 1.5V to 6.0V under constant junction temperature, the
parameter is satisfied the criterion as above mentioned. If temperature varies between 0oC ≤ TA ≤ 80oC, it needs output
current to be larger than 10mA to satisfy the criterion.
Note 3: Dropout Voltage is tested under IOUT = 5A and the following testing conditions:
First step is to find out the VOUT value (VOUT1) when VIN1 = VOUT + 1.5V,
Second step is to decrease VIN (VIN2) until VOUT value is equal to 99% x VOUT1 (VOUT2). VDROPOUT = VIN2 – VOUT2
.
Note 4: Minimum Load Current is defined as the minimum output current required to maintain regulation.
When 1.5V ≦ VIN – VOUT ≦ 6V, the device is guaranteed to regulate if the output current is greater than 10mA.
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 4 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
1.Dropout Voltage vs. Output Current
2.Output Voltage vs. Temperature
3.Output Voltage vs. Output Current
4.Load Transient Response
5.Line Transient Response
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 5 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
BLOCK DIAGRAM
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 6 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
DETAILED INFORMATION
A1084 is a series of low dropout voltage, three terminal regulators which application circuit of 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, band-gap, thermal shutdown, current limit,
power transistors and its driver circuit and so on.
Thermal Shutdown and Current Limit
The A1084 thermal shutdown and current limit modules can assure chip and its application system working
safety when the environment temperature is larger than 80oC or output current is larger than 5.2A.
Stable Reference Output Voltage
The band-gap module provides stable reference voltage, whose temperature coefficient is compensated by
careful design considerations. The temperature coefficient is under 100ppm/oC. And the accuracy of
output voltage is guaranteed by trimming technique.
Application Hints (See Schematic 1)
1. Recommend using 10uF Tan capacitor (CIN) as bypass capacitor for all application circuit.
2. Recommend using 22uF Tan capacitor (COUT) to assure circuit stability.
3. Using a bypass capacitor (CADJ) between the adjust terminal and ground can improve ripple rejection, this
bypass capacitor prevents ripple from being amplified as the output voltage is increase. The impedance
of CADJ should be less than the resistor’s (R1) which is between output and adjust pins to prevent ripple
from being amplified at any ripple frequency. As R1 is normally in the range of 120Ω ~ 200Ω, the value of
CADJ should satisfy this equation: 1 / (2πx FRIPPLE x CADJ) < R1. Recommend using 10uF Tan capacitor.
Output Voltage of Adjustable Version
The A1084 adjustable version provides 1.25V reference voltage. Any output voltage between 1.25V ~ 10V
can be available by choosing two external resistors (connection method is shown in Schematic 1), R1 and R2
are the two external resistors.
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 7 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Example
The output voltage of A1084 adjustable version satisfies this followed equation:
VOUT = VREF x (1+R2 / R1) + IADJ x R2
We can ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (about 4mA).
The value of R1 should be in the range 120Ω ~ 200Ω to assure chip working normally without any load. To
assure the electrical performance showed in Table 1, the output current should be larger than 5mA. If R1 is
too large, the minimum output current should be large than 4mA, the best working condition is to assure that
the output current exceeds 10mA.
(Schematic 1)
Adjustable Version (A1084)
VOUT = VREF x (1+R2 / R1) + IADJ x R2
Fixed Output Version (A1084-XX)
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 8 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
PACKAGE INFORMATION
Dimension in TO-252 (Unit: mm)
Tape Dimension
Reel Dimension
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 9 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Dimension in TO-263-2 (Unit: mm)
Tape Dimension
Reel Dimension
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 10 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Dimension in TO-263-3 (Unit: mm)
Tape Dimension
Reel Dimension
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 11 -
A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discountinue 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
In order to
involve potential risks of death, personal injury, or servere property, or environmental damage.
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.
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 12 -
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