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A1084 데이터시트 PDF




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부품번호 A1084 기능
기능 5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
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A1084 데이터시트, 핀배열, 회로
AiT Semiconductor Inc.
www.ait-ic.com
A1084
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
DESCRIPTION
The A1084 is a series of low dropout three terminal
regulators with a dropout of 1.4V at 5A load current.
FEATURES
Provide Fixed Version and an Adjustable
Version, Output Value can be customized on
command.
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.
Maximum Output Current: 5A
Range of Operation Input Voltage: Max 15V
Line Regulation: 0.2% (Typ.)
Load Regulation: 0.2% (Typ.)
Environment Temperature: 0oC to +80oC
The A1084 offers thermal shutdown and current limit
functions, to assure the stability of chip and power
system.
Available in TO-252, TO-263-2 and TO-263-3
Package
APPLICATION
Power Management for Computer Mother
The A1084 is available in TO-252, TO-263-2 and
TO-263-3 package.
Board, Graphic Card
Battery Charger
Microprocessor Supply
Post Regulators for Switching Supplies
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
TO-252
A1084DR-XX
D
A1084DVR-XX
TO-263-2
A1084S2R-XX
S2
A1084S2VR-XX
TO-263-3
A1084S3R-XX
S3
A1084S3VR-XX
XX: Output Voltage,
33 = 3.3V, 50 = 5V,
Note
ADJ: Adjustable
R : Tape & Reel
V: Green Package
AiT provides all Pb free products
Suffix “ V “ means Green Package
Adjustable Version
VOUT = VREF x (1 + R2 / R1) + IADJ x R2
Fixed Output Version
REV1.2 - JUN 2007 RELEASED – SEP 2008 REVISED -
-1-




A1084 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A1084
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
ILIMIT
Current Limit
VIN − VOUT = 3V, TJ = 25oC
Minimum Load
Current (Note 4)
A1084-ADJ
7.0 A
3 10 mA
Iq Quiescent Current VIN = 10V
5 10 mA
Adjustable Version
IADJ Adjust Pin Current
VIN = 4.25V, IOUT = 10mA
45 110 uA
Ripple Rejection
F = 120Hz, COUT = 25uF (Tan)
IOUT = 5A, VIN − VOUT = 3V
60
dB
ICHANGE
Adjust Pin Current 10mA ≤ IOUT ≤ 5A,
Change
1.5V ≤ VIN − VOUT ≤ 6V
0.2 5 uA
Temperature Stability
IOUT = 10mA,
VIN − VOUT = 1.5V
0.5 %
Thermal Resistance TO-252
ΘJC
Junction to Case TO-263-2 and TO-263-3
12.5
3
oC/W
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 0 oC ≤ TA ≤ 80 oC, 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-

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A1084 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A1084
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-

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