SPX3819M5-L-5-0 [EXAR]
500mA, LOW-NOISE LDO VOLTAGE REGULATOR; 500毫安，低噪声LDO稳压器
| 型号： | SPX3819M5-L-5-0 |
| 厂家： | 
EXAR CORPORATION |
| 描述： | 500mA, LOW-NOISE LDO VOLTAGE REGULATOR |
| 文件： | 总13页 (文件大小：1469K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SPX3819
500mA, LOW-NOISE LDO VOLTAGE REGULATOR
JULY 30, 2008
REV. F
FEATURES
ADJ/BYP
GND
EN
8
7
6
■ Low Noise: 40µV Possible
■ High Accuracy: 1%
SPX3819
NC
8 Pin DFN
V
NC
IN
■ Reverse Battery Protection
■ Low Dropout: 340mV at Full Load
■ Low Quiescent Current: 90µA
■ Zero Off-Mode Current
5
NC
V
OUT
■ Fixed Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V,
APPLICATIONS
3.1V, 3.3V, 5.0V. Adj. Output also available.
■ Battery Powered Systems
■ Cordless Phones
■ Available in RoHS Compliant, Lead Free
Packages: 5 Pin SOT-23, 8 Pin Narrow
SOIC and 8 pin 2X3 DFN
■ Radio Control Systems
■ Portable/Palm Top/Notebook Computers
■ Portable Consumer Equipment
■ Portable Instrumentation
■ Bar Code Scanners
■ SMPS Post Regulators
DESCRIPTION
The SPX3819 is a positive voltage regulator with a low dropout voltage and low noise output. In
addition, this device offers a very low ground current of 800µA at 100mA output. The SPX3819 has
an initial tolerance of less than 1% max and a logic compatible ON/OFF switched input. When
disabled, power consumption drops to nearly zero. Other key features include reverse battery
protection, current limit, and thermal shutdown. The SPX3819 includes a reference bypass pin for
optimal low noise output performance. With its very low output temperature coefficient, this device
also makes a superior low power voltage reference.
The SPX3819 is an excellent choice for use in battery-powered applications such as cordless
telephones, radio control systems, and portable computers. It is available in several fixed voltages
-- 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 5.0V -- or with an adjustable output. This device is offered
in 8 pin NSOIC, 8 pin DFN and 5-pin SOT-23 packages.
TYPICAL APPLICATION CIRCUIT
VIN
1
VOUT
5
+
2
SPX3819
GND
EN
+
3
4
BYP
(Opt.)
ENABLE may be tied directly to V
IN
TOP View
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ...................................................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ........................................... 260°C
Operating Junction Temperature Range ................... -40°C to +125°C
Input Supply Voltage ........................................................ -20V to +20V
Enable Input Voltage ........................................................ -20V to +20V
RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
Input Voltage ................................................................... +2.5V to+16V
Operating Junction Temperature Range ................... -40°C to +125°C
Enable Input Voltage ........................................................... 0.0V to VIN
TJ=25°C, VOUT + 1V, for 1.2V Option VIN=VOUT + 1.2V IL=100µA, CL=1µF, and VENABLE ≥ꢀ2.4V. The
♦ denotes the
specifications which apply over full operating temperature range -40°C to +85°C, unless otherwise specified.
PARAMETER
MIN
TYP
MAX
UNITS
♦ꢀ
♦
CONDITIONS
Output Voltage Tolerance
-1
-2
+1
+2
%
Output Voltage Temperature Coef.
Line Regulation
57
0.04
ppm/°C
%/V
0.1
VIN = VOUT +1 to 16V and VEN ≤ 6V
VIN = VEN =VOUT +1 ≤ 8V
♦ꢀ
0.2
VIN = VEN =VOUT +1 to 16V
Ta = 25°C to 85°C
ꢀ
0.2
Load Regulation
0.05
10
0.4
%
mV
IL = 0.1mA to 500mA
IL = 100µA
Dropout Voltage
60
(VIN-VO)(Note 2)
80
♦ꢀ
♦ꢀ
♦ꢀ
♦
125
180
340
0.05
90
175
250
mV
mV
mV
µA
IL = 50mA
IL = 150mA
IL = 500mA
350
450
550
700
Quiescent Current (IGND
)
3
VENABLE ≤ꢀ0.4V
VENABLE ≤ꢀ0.25V
8
♦ꢀ
♦ꢀ
♦
Ground Pin Current (IGND
)
150
190
µA
IL = 100µA
IL = 50mA
IL = 150mA
IL = 500mA
250
1.0
650
µA
900
2.0
2.5
mA
mA
♦
6.5
25.0
30.0
♦
Ripple Rejection (PSRR)
70
dB
Current Limit (ILIMIT
)
800
mA
VOUT = 0.0V
950
0.4
♦
Output Noise (eNO
)
300
40
µVRMS
µVRMS
IL=10mA, CL=1.0µF, CIN=1µF,
(10Hz-100kHz)
IL=10mA, CL=10µF, CBYP =1µF,
CIN =1µF, (10Hz-100kHz)
Input Voltage Level Logic Low (VIL)
Input Voltage Level Logic High (VIH
ENABLE Input Current
V
V
µA
OFF
ON
)
2
0.01
3
2
VIL ≤ꢀ0.4V
20
VIH ≥ꢀ2.0V
Thermal Resistance (Note 1)
191
128.4
59
°C/W
°C/W
°C/W
♦ꢀ
♦ꢀ
♦ꢀ
SOT-23-5 / Junction to Ambient
NSOIC-8 / Junction to Ambient
DFN-8 / Junction to Ambient
NOTES
Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ(max) the junction to ambient thermal
resistance, and the ambient θJA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is
given: PD(max) = (TJ(max)-TA)/θJA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will
go into thermal shutdown. The θJA of the SPX3819 is 220°C/W mounted on a PC board.
Note 2: Not applicable to output voltage 2V or less.
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
160
150
140
130
120
100
90
3.3V Device
VIN= 4.3V
CL = 1.0µF
80
70
60
3.3V Device
C = 1.0µF
L
L
I
= 100µA
4
0
100
200
300
400
500
6
8
10
12
14
16
I
(mA)
V
(V)
L
IN
Ground Current vs Input Voltage
Ground Current vs Load Current
14.0
3.350
3.345
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
3.3V Device
V
= 4.3V
IN
12.0
10.0
C
= 1.0µF
L
8.0
6.0
4.0
2.0
0.0
3.3V Device
C = 1.0µF
L
L
I
= 100µA
3.300
3.295
3.290
4
6
8
10
12
14
16
0
100
200
300
400
500
V
(V)
IN
I
(mA)
L
Output Voltage vs Input Voltage
Ground Current vs Load Current in Dropout
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
3
.316
.314
350
300
250
200
150
100
50
3
3.3V Device
3.3V Device
V
= 4.3V
IN
CL = 1.0µF
C
= 1.0µF
L
3.312
3
3
3
.310
.308
.306
3
.304
3
.302
.300
0
3
0
100
200
300
400
500
0
100
200
300
400
500
I
(mA)
I
L
(mA)
L
Output Voltage vs Load Current
Dropout Voltage vs Load Current
130
120
110
100
90
360
340
320
300
280
260
240
220
200
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 100µA
3.3V Device
VIN = 4.3
CL= 1.0µF
I
L = 50mA
80
70
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Ground Current vs Temperature with 50mA Load
Ground Current vs Temperature with 100µA Load
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
14.0
8.0
7.5
7.0
6.5
6.0
3.3V Device
VIN= 4.3µF
3.3V Device
CL= 1.0µF
13.5
13.0
12.5
12.0
11.5
11.0
10.5
V
IN= 4.3µF
IL = 500mA
CL= 1.0µF
IL = 500mA
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Ground Current vs Temperature in Dropout
Ground Current vs Temperature with 500mA Load
3.400
3.380
1.30
3.3V Device
C = 1.0µF
L
I
= 100µA
3.3V Device
L
1.25
1.20
1.15
1.10
1.05
1.00
V
= 4.3µF
IN
3.360
3.340
3.320
3.300
2.280
2.260
2.240
2.220
2.200
C = 1.0µF
L
L
I
= 500mA
-40
-20
0
20
40
60
80
100
120
4
6
8
10
(V)
12
14
16
Temperature (°C)
V
IN
Output Voltage vs Temperature
ENABLE Voltage, ON threshold, vs Input Voltage
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
350
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
300
250
200
150
100
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
50
0
1
10
100
1000
10000 100000 1000000
Bypass Cap (pF)
Line Transient Response for 3.3V Device
Output Noise vs Bypass Capacitor Value IL = 10mA,
10Hz - 100kHz
Load Transient Response for 3.3V Device
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
6
APPLICATION INFORMATION
The SPX3819 requires an output capacitor for
device stability. Its value depends upon the
application circuit. In general, linear regulator
stability decreases with higher output currents.
In applications where the SPX3819 is sourcing
less current, a lower output capacitance may be
sufficient. For example, a regulator outputting
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
concern. The SPX3819 start-up speed is in-
versely proportional to the size of the BYP
capacitor. Applications requiring a slow ramp-
up of the output voltage should use a larger
CBYP. However, if a rapid turn-on is necessary,
the BYP capacitor can be omitted.
The SPX3819’s internal reference is available
through the BYP pin.
Benchtestingisthebestmethodfordetermining
the proper type and value of the capacitor since
the high frequency characteristics of electro-
lytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2µF alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1µF tantalum electrolytic.
Figure 1 represents a SPX3819 standard appli-
cation circuit. The EN (enable) pin is pulled
high (>2.0V) to enable the regulator.
To disable the regulator, EN < 0.4V.
The SPX3819 in Figure 2 illustrates a typical
adjustable output voltage configuration. Two
resistors (R1 and R2) set the output voltage. The
output voltage is calculated using the formula:
With the SPX3819 adjustable version, the mini-
mumvalueofoutputcapacitanceisafunctionof
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
VOUT = 1.235V x [ 1 + R1/R2]
R2 must be > 10 kΩꢀand for best results, R2
shouldbebetween22kΩ and47kΩ.
Typical Applications Circuits
A 10nF capacitor on the BYP pin will signifi-
cantly reduce output noise, but it may be left
unconnected if the output noise is not a major
VIN
1
VOUT
5
VOUT
VIN
1
5
4
+
+
R1
R2
2
2
SPX3819
SOT-23
SPX3819
GND
EN
+
GND
EN
+
3
3
4
BYP
(Opt.)
Hi-ON
Lo-OFF
ENABLE may be tied directly to V
IN
TOP View
TOP View
Figure 2. Typical Adjustable Output Voltage Configuration
Figure 1. Standard Application Circuit
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
7
PACKAGE: PIN DESCRIPTION
Pin #
nSOIC
Pin #
DFN
Pin #
SOT-3
Pin Name
Description
2
5-8
3
3
7
5
1
1
2
5
3
VIN
GND
VOUT
EN
Supply Input
Ground
Regulator Output
1
Enable(input). CMOS compatible
control input. Logic high = enable;
logic low or open = shutdown
4
-
8
4
-
ADJ/BYP Adjust(input). Feedback input.
Connect to resistive voltage-divider
network
4, 6
NC
No Connect
PACKAGE: PINOUTS
ADJ/BYP
GND
EN
NC
1
GND
8
EN
1
2
8
7
6
SPX3819
SPX3819
GND
7
V
2
IN
8 Pin DFN
8 Pin nSOIC
V
3
4
NC
IN
3
4
V
6
5
GND
GND
OUT
5
NC
V
OUT
ADJ/BYP
Note: The bottom exposed pad for the SPX3819
DFN package is connected to GND.
V
ADJ/BYP
4
OUT
5
SPX3819
5 Pin SOT-23
1
IN
2
GND
3
EN
V
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
8
ORDERING INFORMATION
Accuracy
Quantity
Part Number
MSL Level Status Package Pack Type
RoHS
SPX3819S-L/TR
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 250ºC
L1 @ 250ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
L1 @ 260ºC
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
NSOIC8
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
DFN8
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
TUBE
2500
2500
2500
2500
2500
2500
2500
98
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SPX3819S-L-1-8/TR
SPX3819S-L-2-5/TR
SPX3819S-L-3-0/TR
SPX3819S-L-3-1/TR
SPX3819S-L-3-3/TR
SPX3819S-L-5-0/TR
SPX3819S-L
SPX3819S-L-1-8
TUBE
98
SPX3819S-L-2-5
TUBE
98
SPX3819S-L-3-0
TUBE
98
SPX3819S-L-3-1
TUBE
98
SPX3819S-L-3-3
TUBE
98
SPX3819S-L-5-0
TUBE
98
SPX3819M5-L
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Not in Bulk
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Not in Bulk
Tape & Reel
Tape & Reel
Tape & Reel
TUBE
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
2500
3000
3000
2500
2500
98
SPX3819M5-L-1-2
SPX3819M5-L-1-5
SPX3819M5-L-1-8
SPX3819M5-L-2-5
SPX3819M5-L-3-0
SPX3819M5-L-3-1
SPX3819M5-L-3-3
SPX3819M5-L-5-0
SPX3819M5-L/TR
SPX3819M5-L-1-2/TR
SPX3819M5-L-1-5/TR
SPX3819M5-L-1-8/TR
SPX3819M5-L-2-5/TR
SPX3819M5-L-3-0/TR
SPX3819M5-L-3-1/TR
SPX3819M5-L-3-3/TR
SPX3819M5-L-5-0/TR
SPX3819R2-L-1-2
SPX3819R2-L-1-2/TR
SPX3819S-L-1-2/TR
SPX3819S-L-1-5/TR
SPX3819S-L-1-2
Ac
ti
ve
Active
DFN8
Active
SOIC-8
Active
SOIC-8
Active
SOIC-8
SPX3819S-L-1-5
A
ctive
SOIC-8
TUBE
98
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
12
For further assistance:
Email:
customersupport@exar.com
EXAR Technical Documentation: http://www.exar.com/TechDoc/default.aspx?
Exar Corporation
Headquarters and
Sales Office
48720 Kato Road
Fremont, CA 94538
main: 510-668-7000
fax: 510-668-7030
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.
July 2008 Rev F
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2008 Exar Corporation
13
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