SPX3940M3-L-2-5 [EXAR]
1A Low Dropout Voltage Regulator; 1A低压差稳压器
| 型号： | SPX3940M3-L-2-5 |
| 厂家： | 
EXAR CORPORATION |
| 描述： | 1A Low Dropout Voltage Regulator |
| 文件： | 总11页 (文件大小：1364K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SPX3940
1A Low Dropout Voltage Regulator
February 2012
Rev. 1.0.0
GENERAL DESCRIPTION
APPLICATIONS
The SPX3940 is a 1A, accurate voltage
regulator with a low drop out voltage of
280mV (typical) at 1A.
ñ Power Supplies
ñ LCD Monitors
ñ Portable Instrumentation
ñ Medical and Industrial Equipments
These regulators are specifically designed for
low voltage applications that require a low
dropout voltage and a fast transient response.
They are fully fault protected against over-
current, reverse battery, and positive and
negative voltage transients.
FEATURES
ñ Guaranteed 1.5A Peak Current
ñ 1% Output Accuracy SPX3940A
ñ Low Quiescent Current
The SPX3940 is offered in 3-pin SOT223 and
TO-263 packages. For a 3A version, refer to
the SPX29300 data sheet.
ñ Low Dropout Voltage of 280mV at 1A
ñ Extremely Tight Load and Line
Regulation
ñ Extremely Fast Transient Response
ñ Reverse-battery Protection
ñ Internal Thermal Protection
ñ Internal Short Circuit Current Limit
ñ Replacement for LM3940
ñ Standard SOT223 & TO-263 packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: SPX3940 Application Diagram – Fixed Output Linear Regulator
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
SPX3940
1A 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 VIN ....................................................16V
Junction Temperature Range ....................-40°C to 125°C
Packages Thermal Resistance
SOT-223 Junction to Case (at TA)..................... 15°C/W
SOT-223 Junction to Ambient........................62.3°C/W
TO-263 Junction to Case (at TA).........................3°C/W
TO-263 Junction to Ambient..........................31.4°C/W
Input Voltage VIN ................................................... 20V1
Storage Temperature.............................. -65°C to 150°C
Lead Temperature (Soldering, 5 sec) .....................260°C
Note 1: Maximum positive supply voltage of 20V must be
of limited duration (<100ms) and duty cycle (<1%). The
maximum continuous supply voltage is 16V.
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Ambient Temperature of TA = 25°C only; limits applying over the full
O p e r a t i n g J u n c t i o n T e mp e r a t u r e •”r.a nMgien iamruem daenndo t Meadx ibmyu ma l “i mi t s a r e
g u a r a
design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided
for reference purposes only. Unless otherwise indicated, VIN = VIN +1V, IOUT = 10mA, CIN = 6.8µF, COUT = 10µF, TA = 25°C.
Parameter
1.8V version
Min.
Typ.
Max.
Units
Conditions
1.8
1.8
1.8
1.8
1.818
1.845
1.836
1.863
1.782
1.755
1.764
1.737
Output Voltage - SPX3940A (1%)
V
V
•
•
IOUT=10mA
1 0 mA ≤I≤1 A ,
6INV≤≤1V6 V
OUT
Output Voltage - SPX3940 (2%)
2.5V version
2.5
2.5
2.5
2.5
2.525
2.563
2.550
2.588
2.475
2.437
2.450
2.412
Output Voltage - SPX3940A (1%)
V
V
•
•
IOUT=10mA
1 0 mA ≤I≤1 A ,
6INV≤≤1V6 V
6INV≤≤1V6 V
6INV≤≤1V6 V
OUT
Output Voltage - SPX3940 (2%)
3.3V version
3.3
3.3
3.3
3.3
3.333
3.383
3.366
3.416
3.267
3.217
3.234
3.184
Output Voltage - SPX3940A (1%)
V
V
•
•
IOUT=10mA
1 0 mA ≤I≤1 A ,
OUT
Output Voltage - SPX3940 (2%)
5.0V version
5.0
5.0
5.0
5.0
5.050
5.125
5.100
5.175
4.950
4.875
4.900
4.825
Output Voltage - SPX3940A (1%)
V
V
•
•
IOUT=10mA
1 0 mA ≤I≤1 A ,
OUT
Output Voltage - SPX3940 (2%)
All Voltage Options
Line Regulation
0.2
0.3
1.0
1.5
%
%
IOUT=10mA, (VOUT +1 V ) ≤≤V1 6 V
IN
Load Regulation
VIN = VOUT +1 V , 1 0 mA ≤I1 A
OUT
∆
- Output Voltage
∆
•
20
100
ppm/°C
temperature Coefficient
Dropout Voltage2
(except 1.8V version)
•
•
•
70
280
12
200
550
25
mV
mV
mA
mA
IOUT=100mA
IOUT=1A
IOUT=750mA, VIN = VOUT +1V
IOUT=1A
Ground Current3
18
IGNDDO Ground Pin Current at
Dropout
1.2
mA
VIN = 0.1V less than specified VOUT IOUT=10mA,
Current Limit
VOUT = 0V4
2.2
400
260
A
1.5
10Hz-100KHz, IL=100mA, CL=10µF
10Hz-100KHz, IL=100mA, CL=33µF
µVRMS
µVRMS
Output Noise Voltage
© 2012 Exar Corporation
2/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
Note 2: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its normal
value.
Note 3: 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 4: VIN=VOUT(NOMINAL)+1V. For example, use VIN=4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize
temperature rise.
BLOCK DIAGRAM
Fig. 2: SPX3940 Block Diagram
PIN ASSIGNMENT
Fig. 3: SPX3940 Pin Assignment
© 2012 Exar Corporation
3/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
ORDERING INFORMATION
Temperature
Packing
Quantity
Part Number
Range
Marking
Package
Note 1
Note 2
3940A
18YYWWL
XXX
3940A
25YYWWL
XXX
3940A
33YYWWL
XXX
3940A
50YYWWL
XXX
2.5K/Tape & Reel
SPX3940AM3-L-1-8
1.8V Output
Voltage – 1%
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
Lead Free
Bulk
2.5K/Tape & Reel
Bulk
SPX3940AM3-L-1-8/TR
SPX3940AM3-L-2-5
2.5V Output
Voltage – 1%
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
Lead Free
Lead Free
Lead Free
SPX3940AM3-L-2-5/TR
2.5K/Tape & Reel
Bulk
SPX3940AM3-L-3-3
3.3V Output
Voltage – 1%
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
SPX3940AM3-L-3-3/TR
2.5K/Tape & Reel
Bulk
SPX3940AM3-L-5-0
5.0V Output
Voltage – 1%
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
SPX3940AM3-L-5-0/TR
500/Tape & Reel
Bulk
SPX3940AT-L-1-8
1.8V Output
Voltage – 1%
SPX3940AT
18YYWWLX
3-pin
TO-263
-4 0 ° C J≤≤T+1 2 5 °
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
SPX3940AT-L-1-8/TR
500/Tape & Reel
Bulk
SPX3940AT-L-3-3
3.3V Output
Voltage – 1%
SPX3940AT
33YYWWLX
3-pin
TO-263
-40°C≤ T≤+1 2 5 °
J
SPX3940AT-L-3-3/TR
SPX3940AT-L-5-0
500/Tape & Reel
Bulk
5.0V Output
Voltage – 1%
SPX3940AT
50YYWWLX
3-pin
TO-263
-4 0 ° C J≤≤T+1 2 5 °
SPX3940AT-L-5-0/TR
2.5K/Tape & Reel
Bulk
SPX3940M3-L-2-5
2.5V Output
Voltage – 2%
3940M3
25YYWWL
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
SPX3940M3-L-2-5/TR
2.5K/Tape & Reel
Bulk
SPX3940M3-L-3-3
3.3V Output
Voltage – 2%
3940M3
33YYWWL
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
SPX3940M3-L-3-3/TR
2.5K/Tape & Reel
Bulk
SPX3940M3-L-5-0
5.0V Output
Voltage – 2%
3940M3
50YYWWL
3-pin
SOT-223
-4 0 ° C J≤≤T+1 2 5 °
SPX3940M3-L-5-0/TR
500/Tape & Reel
Bulk
SPX3940T-L-3-3
3.3V Output
Voltage – 2%
SPX3940T
33YYWWLX
3-pin
TO-263
-4 0 ° C J≤≤T+1 2 5 °
SPX3940T-L-3-3/TR
500/Tape & Reel
Bulk
SPX3940T-L-5-0
5.0V Output
Voltage – 2%
SPX3940T
33YYWWLX
3-pin
TO-263
-4 0 ° C J≤≤T+1 2 5 °
SPX3940T-L-5-0/TR
“ Y Y ”
= –Y“ eWaWr”
=
Wo rekk– “WXe”
=
L o t –Nwuhemnbaepprlicable.
© 2012 Exar Corporation
4/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
Schematic and BOM from Application Information section of this datasheet.
Fig. 5: Load Regulation
Fig. 4: Line Regulation
Fig. 7: Ground Current vs Input Voltage
Fig. 6: Ground Current vs Load Current
Fig. 9: Dropout Voltage vs Load Current
Fig. 8: Ground Current vs Load Current in Dropout
© 2012 Exar Corporation
5/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
Fig. 10: Ground Current vs Temperature
ILOAD=100mA
Fig. 11: Output Voltage vs Temperature
ILOAD=100mA
Fig. 12: Ground Current vs Temperature
ILOAD=500mA
Fig. 13: Ground Current vs Temperature
Dropout, ILOAD=750mA
Fig. 14: Ground Current vs Temperature
ILOAD=1.5A
Fig. 15: Ground Current vs Temperature
Dropout, ILOAD=1.5A
© 2012 Exar Corporation
6/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
Fig. 16: Dropout Voltage vs Temperature
ILOAD=750mA
Fig. 17: Dropout Voltage vs Temperature
ILOAD=1.5A
Fig. 18: Enable Current vs Temperature
VEN=16V
Fig. 19: Enable Threshold vs Temperature
© 2012 Exar Corporation
7/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
TJ = TA + PD * ( θ+ θ + JθC) or
THEORY OF OPERATION
HA
CH
TJ = 50 + 7.5 * (1 + 2 + 3) = 95°C
Reliable operation is insured.
The SPX3940 incorporates protection against
over-current faults, reversed load insertion,
over temperature operation, and positive and
negative transient voltage.
CAPACITOR REQUIREMENTS
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
THERMAL CONSIDERATIONS
Although the SPX3940 offers limiting circuitry
for overload conditions, it is still necessary to
insure
temperature
that
the
not
maximum
exceeded
junction
in the
is
conditions.
A
tantalum
capacitor
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 mount-ing is required.
Consult heatsink manufacturer for thermal
resistance and design of heatsink.
recommended if a faster load transient
response is needed.
If the power source has a high AC impedance,
a 0.1µF ceramic capacitor between input &
ground is recommended.
MINIMUM LOAD CURRENT
TO-220 Design Example:
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX3940 is required.
Assume that VIN = 10V, VOUT = 5V,
IOUT = 1.5A, TA
=
5 0 ° C / W=, 1°θC/W,
HA
θCH 2 ° C / W, JC a=n3°dC/Wθ.
=
Where 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:
Fig. 20: Fixed Output Linear Regulator
PD = (VIN – VOUT) * IOUT = 7.5W.
And the junction temperature is calculated as
© 2012 Exar Corporation
8/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
PACKAGE SPECIFICATION
3-PIN SOT-223
© 2012 Exar Corporation
9/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
3-PIN TO-263
© 2012 Exar Corporation
10/11
Rev. 1.0.0
SPX3940
1A Low Dropout Voltage Regulator
REVISION HISTORY
Revision
Date
Description
04/14/2006
A
Reformat of Datasheet
Package drawing corrections
02/29/2012
1.0.0
FOR FURTHER ASSISTANCE
Email:
customersupport@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
u s e r ’ s
s p e c i f i c
a p p l i c a t i o n .
Wh i l e t h e i n f o r ma t i o n i n t h i s
p u b l,i c a t i o n
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.
© 2012 Exar Corporation
11/11
Rev. 1.0.0
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