XRP29302AETBTR-L [EXAR]
3A Low Dropout Voltage Regulator;
| 型号： | XRP29302AETBTR-L |
| 厂家： | 
EXAR CORPORATION |
| 描述： | 3A Low Dropout Voltage Regulator |
| 文件： | 总9页 (文件大小：1372K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XRP29302
3A Low Dropout Voltage Regulator
November 2013
Rev. 1.3.0
GENERAL DESCRIPTION
APPLICATIONS
The XRP29302 is a 3A, highly accurate voltage
regulator with a low dropout voltage of 600mV
(typical) at 3A.
• Adjustable Power Supplies
• Constant Current Regulators
• Audio and Video/Graphic Cards
• Battery Chargers
This regulator is specifically designed for low
voltage applications that require a low dropout
voltage and a fast transient response. It is
fully fault protected against over-current,
reverse battery, and positive and negative
voltage transients. On-Chip trimming adjusts
the reference voltage to 1% initial accuracy.
FEATURES
• 3A Guaranteed Output Current
• Low Dropout Voltage of 600mV @ 3A
• Adjustable Output down to 1.25V
• 1% Output Accuracy
The XRP29302 is offered in 5-pin TO-220 &
TO-263 packages.
• Tight Load and Line Regulation
• Fast Transient Response
• Reverse Battery Protection
• Zero Current Shutdown
• Drop-in Replacement to SPX29302
• Lead Free 5-pin TO220 and TO263
Packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP29302 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
XRP29302
3A Low Dropout Voltage Regulator
ABSOLUTE MAXIMUM RATINGS
OPERATING RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Input Voltage Range VIN...........................................16V
Junction Temperature Range....................-40°C to 125°C
Thermal Resistance......................................................
TO-220 Junction to Case @ TA ............................ 3°C/W
TO-220 Junction to Ambient............................. 60°C/W
TO-263 Junction to Case @ TA ............................ 3°C/W
TO-263 Junction to Ambient............................. 60°C/W
Input Voltage VIN1................................................... 20V
Storage Temperature.............................. -65°C to 150°C
Lead Temperature (Soldering, 5 sec) .....................260°C
ESD Rating (HBM - Human Body Model)..........................
All pins except EN................................................. 2kV
En pin................................................................. 1kV
Note 1: Maximum positive supply voltage of 20V must be
of limited duration (<100ms) and duty cycle of less than
1%. The maximum continuous supply voltage is 16V.
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of TJ = TA = 25°C only; limits applying over the
full Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V and IOUT=10mA, CIN = 6.8µF, COUT = 10µF, TA= 25°C.
Parameter
Line Regulation
Min.
Typ.
Max.
Units
Conditions
0.06
0.2
20
0.5
1
%
%
IOUT=10mA, (VOUT+1V)≤VIN≤16V
VIN=VOUT + 1V, 10mA≤IOUT ≤IFL (note 2)
VOUT Temp Coefficient (note 6)
IOUT=100mA
Load Regulation
•
•
ΔV/ΔT
100
300
ppm/˚C
120
380
525
600
30
I
I
I
OUT=1.5A
Dropout Voltage (note 3)
mV
•
•
•
650
800
60
OUT=2.5A, XRP29302A only
OUT=3A
IOUT=1.5A
IOUT=3A
Ground Current (note 5)
mA
40
Ground Pin Current at Dropout
Current Limit
0.9
4.5
400
260
1.24
mA
A
VIN = 0.5V less than specified VOUT IOUT=10mA
VOUT=0V (note 4)
3.0
10Hz-100KHz, IOUT=100mA, COUT=10µF
10Hz-100KHz, IOUT=100mA, COUT=33µF
Output Noise Voltage
Reference Voltage
µVRMS
1.252
1.265
80
V
V
1.228
1.215
•
•
40
Adjust Pin Bias Current
nA
120
Reference Voltage
Temperature Coefficient
20
ppm/˚C
nA/˚C
Note 7
Adjust Pin Bias Current
Temperature Coefficient
0.1
Enable Input
•
•
Input Logic Voltage Low (OFF)
Input Logic Voltage High (ON)
0.8
V
VIN<10V
2.4
100
10
600
750
1
VEN=16V
VEN=0.8V
Note 8
•
•
•
Enable Input Pin
µA
µA
2
Regulator Output Current in
Shutdown
•
500
Note 2: Full load current (IFL) is defined as 3.0A.
Note 3: Dropout voltage is defined (VIN-VOUT) when the output voltage drops to 99% of its nominal value.
Note 4: VIN=VOUT(nom)+1V. Use pulse-testing procedures to minimize temperature rise.
© 2013 Exar Corporation
2/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the
load current to the ground current.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range
Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is
applied, excluding load/line regulation effects. Specifications for a 200mA load pulse as VIN=20V (a 4W pulse) for t=10ms.
Note 8: VEN ≤ 0.8V and VIN ≤ 16V, VOUT = 0.
BLOCK DIAGRAM
Fig. 2: XRP29302 Block Diagram
PIN ASSIGNMENT
Fig. 3: XRP29302 Pin Assignment
© 2013 Exar Corporation
3/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
ORDERING INFORMATION
Junction
Temperature
Range
Part Number
Marking
Package
Packing Quantity
Note 1
Note 2
XRP29302E
YYWW X
XRP29302E
YYWW X
XRP29302E
YYWW X
XRP29302ET-L
5-pin TO220
5-pin TO263
5-pin TO263
Bulk
Bulk
Lead Free
Lead Free
Lead Free
-40°C≤TJ≤+125°C
-40°C≤TJ≤+125°C
-40°C≤TJ≤+125°C
XRP29302ETB-L
XRP29302ETBTR-L
500/Tape & Reel
XRP29302AETB-L
Bulk
500/Tape & Reel
XRP29302E
YYWW X
Adjustable
5-pin TO263
Lead Free
-40°C≤TJ≤+125°C
XRP29302AETBTR-L
“YY” = Year – “WW” = Work Week – “X” = Lot Number
Note: XRP29302AETB-L has the same package marking as XRP29302ETB-L. The “A” designator is only provided on the
packaging label.
© 2013 Exar Corporation
4/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = VOUT + 1V, TJ = TA = 25°C, unless otherwise specified.
Fig. 5: Startup
Fig. 4: Dropout Voltage vs Load Current
Fig. 6: Line Regulation
Fig. 7: Load Regulation
I
OUT=10mA, VOUT=3.3V
VOUT=3.3V
© 2013 Exar Corporation
5/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
THEORY OF OPERATION
CAPACITOR REQUIREMENTS
The XRP29302 incorporates protection against
over-current faults, reversed load insertion,
over temperature operation, and positive and
negative transient voltage.
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10μF aluminum
capacitor will guarantee stability over all load
conditions.
THERMAL CONSIDERATIONS
A tantalum capacitor is recommended if a
faster load transient response is needed. If the
power source has high AC impedance, a 0.1μF
ceramic capacitor between input & ground is
recommended.
Although the XRP29302 offers limiting circuitry
for overload conditions, it is still necessary to
insure
temperature
that
the
not
maximum
exceeded
junction
in the
is
application. Heat will flow through the lowest
resistance path, the junction-to-case path. In
order to insure the best thermal flow of the
component, proper mounting is required.
MINIMUM LOAD CURRENT
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
XRP29302 is required.
TO-220 DESIGN EXAMPLE:
Assume that VIN
IOUT = 1.5A, TA = 50°C, θHA= 1°C/W, θCH=
2°C/W, and θJC= 3C°/W, where:
=
10V, VOUT
=
5V,
ADJUSTABLE REGULATOR DESIGN
The XRP29302 is an adjustable regulator that
can be programmed to any value between
1.25V and 16V using 2 external resistors, R1
and R2. The relationship between the resistors
and the output voltage is:
TA = ambient temperature,
θHA= heatsink to ambient thermal resistance
θCH= case to heatsink thermal resistance
θJC = junction to case thermal resistance
The power calculated under these conditions
is:
푉푂푈푇
푅1 = 푅2 × ꢄ
− 1ꢅ
1.240
ENABLE INPUT
The XRP29302 has an Enable function that
switches the regulator on and off. Their
thresholds are TTL compatible. When the
regulator is active, approximately 20 µA flows
through the Enable pin.
(
)
푃퐷 = 푉퐼푁 − 푉푂푈푇 × ꢀ푂푈푇 = 7.5푊
And the junction temperature is calculated as
ꢁ = ꢁ + 푃퐷 × �휃퐻퐴 + 휃퐶퐻 + 휃퐽퐶ꢂ
TYPICAL APPLICATION CIRCUITS
퐽
퐴
Figure 1 represents the typical implementation
for an adjustable output regulator. The values
of R1 and R2 set the output voltage value as
follows:
or
(
)
ꢁ = 50 + 7.5 × 1 + 2 + 3 = 95°ꢃ
퐽
푅1
푉푂푈푇 = 푉ꢆ퐸퐹 × ꢄ1 +
ꢅ
Reliable operation is insured.
푅2
A minimum value of 10kohms is recommended
for R2 with a range between 10kΩ and 47kΩ.
© 2013 Exar Corporation
6/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
PACKAGE SPECIFICATION
5-PIN TO263
*: Dimension “A” (overall package thickness) is controlled to 0.181” maximum for XRP29302 only. Typical dimension “A”
guaranteed for any other device in a 5-pin TO263 is 0.190” inch maximum.
© 2013 Exar Corporation
7/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
5-PIN TO220
© 2013 Exar Corporation
8/9
Rev. 1.3.0
XRP29302
3A Low Dropout Voltage Regulator
REVISION HISTORY
Revision
Date
Description
12/17/2009
12/23/2009
10/19/2010
Initial Release of Datasheet
Addition of ESD data
1.0.0
1.1.0
1.2.0
Corrected Adjustable Regulator Design paragraph equation
Added XRP29302A with 2.5A dropout specification
Updated Package Outline Drawing. ECN 1348-10
11/25/2013
1.3.0
FOR FURTHER ASSISTANCE
Email:
customersupport@exar.com
powertechsupport@exar.com
Exar Technical Documentation:
http://www.exar.com/TechDoc/default.aspx?
EXAR CORPORATION
HEADQUARTERS AND SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no license under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
© 2013 Exar Corporation
9/9
Rev. 1.3.0
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