SPX5205
150mA, Low-Noise LDO Voltage Regulator
Description
FEATURES
■■ Low Noise Output LDO: 40μVRMS
Possible
■■ 1% Initial Accuracy
■■ Very Low Quiecent Current: 70μA
■■ Low Dropout Voltage (210mV at 150mA)
■■ Current and Thermal Limiting
■■ Reverse-Battery Protection
■■ Wide Range of Fixed Output Voltages:
1.8V, 3.0V, 3.3V and 5.0V
■■ Zero Off-Mode Current
■■ Small 5-Pin SOT-23
■■ Pin Compatible to MIC5205/MAX8877
(fixed options only) and LP2985
The SPX5205 is a positive voltage regulator with very low dropout
voltage, output noise and ground current (750μA at 100mA). VOUT has
a tolerance of less than 1% and is temperature compensated. Fixed
output voltages 1.8V, 3.0V, 3.3V, and 5.0V and an adjustable version
are available in a small 5-pin SOT-23 package. Other key features
include zero off-mode current, reverse battery protection, thermal
shutdown and current limit. The SPX5205 is an excellent choice for
use in batterypowered applications, and where power conservation is
desired such as: cellular/ cordless telephones, radio control systems
and portable computers.
Top View
Top View
V OUT
V OUT
BYP
5
4
5
3
1
2
APPLICATIONS
■■ PDA
■■ Battery Powered Systems
■■ Cellular Phone
■■ Cordless Telephones
■■ Radio Control Systems
■■ Laptop, Palmtop and Notebook Computers
■■ Portable Consumer Equipment
■■ Portable Instrumentation
■■ Bar Code Scanners
■■ SMPS Post-Regulator
4
SPX5205
SPX5205
1
ADJ
2
3
V IN GND EN
V IN GND EN
Fixed Output Voltage
Adjustable Output Voltage
Ordering Information - Back Page
Typical Applications Circuit
V IN
1
2
+
GND
+ 1.0 µF
SPX5205
3
EN
VOUT
5
4
5-pin Fixed
BYP
ENABLE may be tied directly to VIN
TOP View
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SPX5205
Absolute Maximum Ratings
Recommended Operating Conditions
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 Supply Voltage..................................... +2.5V to +16V
Operating Junction Temperature Range.....-40˚C to +125˚C
Enable Input Voltage..............................................0V to VIN
SOT-23-5 (ѳJA)................................................... See Note 1
Thermal Shutdown..................................... Internally limited
Lead Temperature (Soldering, 5 seconds)..................260˚C
Input Supply Voltage....................................... -20V to +20V
Enable Input Voltage....................................... -20V to +20V
Electrical Characteristics
TJ = 25°C, VIN = VOUT + 1V, IL = 100μA, CL = 1μF, and VENABLE ≥ 2.4V. The “•” denotes the specifications which
apply over full junction temperature range -40°C to +125°C, unless otherwise specified.
PARAMETER
Output voltage tolerance (VOUT)
Output voltage temperature
coefficient
MIN.
TYP.
MAX.
-1
+1
-2
+2
57
0.03
0.1
Load regulation
%VNOM
ppm/°C
%/V
50
190
250
275
350
Quiescent current (IGND)
0.05
1
5
70
125
150
350
Ground pin current (IGND)
600
800
750
1000
1500
1300
VIN = VEN = VOUT + 1 ≤ 8V
VIN = VOUT + 1 ≥ 2.5V
300
210
•
0.2
230
180
•
VIN = VEN = VOUT + 1 to 16V
TA = 25°C to 85°C
70
Dropout voltage(2)
(VIN - VO)
•
VIN = VOUT + 1 to 16V and VEN ≤ 6V
%
1.0
140
CONDITIONS
0.2
0.5
30
•
0.1
0.2
Line regulation
UNITS
1900
2500
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mV
mV
mV
mV
µA
µA
µA
µA
µA
•
IL= 1mA to 150mA
•
IL= 100µA to 1mA
•
•
•
•
IL= 100µA
IL= 50mA
IL= 100mA
IL= 150mA
VENABLE ≤ 0.4V
•
•
•
•
•
VENABLE ≤ 0.25V
IL= 100µA
IL= 50mA
IL= 100mA
IL= 150mA
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SPX5205
Electrical Characteristics (Continued)
TJ = 25°C, VIN = VOUT + 1V, IL = 100μA, CL = 1μF, and VENABLE ≥ 2.4V. The “•” denotes the specifications which
apply over full junction temperature range -40°C to +125°C, unless otherwise specified.
PARAMETER
MIN.
TYP.
Ripple rejection
70
Current limit (ILIMIT)
360
MAX.
UNITS
500
Output noise (eNO)
mA
µVRMS
40
Input voltage level logic high (VIL)
Enable input current
CONDITIONS
dB
300
Input voltage level logic low (VIL)
•
0.4
2.0
0.01
2
3
20
VOUT = 0V
IL = 10mA, CL = 1µF, CIN = 1µF
(10Hz - 100kHz)
IL = 10mA, CL = 10µF, CBYP = 1µF,
CIN = 1µF (10Hz - 100kHz)
V
OFF
V
ON
µA
VIL ≤ 0.4V
VIH ≥ 2.0V
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
ѳJA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is given: PD(max) = (TJ(max) - TA) / ѳJA, exceeding the
maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown. The ѳJA of the SPX5205 is 220°C/W mounted on
a PC board.
2. Not applicable to output voltages of less than 2V.
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SPX5205
Typical Performance Characteristics
110
1.40
90
80
I GND (µA)
1.00
I GND (mA)
100
3.3V Device
V IN = 3.2V
CL = 1.0μF
1.20
0.80
0.60
70
60
0.40
50
0.20
40
0.00
30
0
50
100
150
V O = 3.3V
CL = 1.0µF
I L = 100μA
4
6
8
12
14
16
V IN (V)
I L (mA)
Figure 1. Ground Current vs. Load Current
Figure 2. Ground Current vs. Input Voltage
3.340
2.00
3.335
3.3V Device
V IN = 4.3V
CL = 1.0µF
3.330
V OUT (V)
1.50
I GND (mA)
10
1.00
3.325
3.320
3.315
3.310
3.305
0.50
3.3V Device
CL = 1.0μF
I L = 100μA
3.300
3.295
3.290
0.00
0
50
100
4
150
6
8
10
12
14
16
V IN (V)
I L (mA)
Figure 3. Ground Current vs. Load Current in Dropout
Figure 4. Output Voltage vs. Input Voltage
3.310
V O=3.3V
V IN = 3.2V
CL = 1.0µF
3.3V Device
V IN = 4.3V
CL = 1.0µF
3.308
150
V OUT (V)
Dropout (mV)
200
100
50
3.306
3.304
3.302
3.300
0
0
50
100
150
0
50
100
150
I L (mA)
I L (mA)
Figure 5. Dropout Voltage vs. Load Current
Figure 6. Output Voltage vs. Load Current
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SPX5205
Typical Performance Characteristics (Continued)
950
90.0
V OUT= 3.3V
V IN = 4.3V
CL = 1.0μF
I L = 100μA
850
750
I GND (μA)
I GND (mA)
80.0
70.0
650
60.0
V OUT = 3.3V
V IN = 4.3V
CL = 1.0μF
I L = 100mA
550
50.0
-40
-20
0
20
40
60
450
-40
80 100 120
-20
Temperature (°C)
40
60
80 100 120
Figure 8. Ground Current vs. Temperature
at ILOAD = 100mA
3.400
2.30
2.20
3.360
3.340
3.320
V OUT (V)
2.00
1.90
1.80
3.300
2.280
1.70
2.260
1.60
2.240
1.50
2.220
1.40
-40
-20
0
20
40
60
V OUT= 3.3V
V IN = 4.3V
CL = 1.0μF
3.380
V OUT= 3.3V
V IN = 4.3V
CL = 1.0μF
I L = 150mA
2.10
I GND (mA)
20
Temperature (°C)
Figure 7. Ground Current vs. Temperature
at ILOAD = 100μA
2.200
-40
80 100 120
-20
0
20
40
60
80 100 120
Temperature (°C)
Temperature (°C)
Figure 10. Output Voltage vs. Temperature
Figure 9. Ground Current in Dropout vs. Temperature
1.60
350
V OUT =3.3V
CL = 1.0μF
I L = 100μA
1.50
1.40
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
300
250
1.30
uV RMS
V EN, On Threshold (V)
0
1.20
1.10
200
150
1.00
100
0.90
50
0.80
4
6
8
10
12
14
0
16
V IN (V)
1
10
100
1000
10000
Bypass Cap (pF)
100000 1000000
Figure 12. Output Noise vs. Bypass Capacitor Value
Figure 11. ENABLE Voltage,
ON Threshold vs. Input Voltage
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SPX5205
Application Information
The SPX5205 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 SPX5205 is
putting out less current, a lower output capacitance may
be sufficient. For example, a regulator sourcing only 10mA,
requires approximately half the capacitance as the same
regulator sourcing 150mA.
Typical Applications Circuits
A 10nF capacitor on the BYP pin will significantly reduce
output noise but it may be left unconnected if the output
noise is not a major concern. The SPX5205 start-up speed
is inversely 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.
Bench testing is the best method for determining the proper
type and value of the capacitor since the high frequency
characteristics of electrolytic capacitors vary widely,
depending on type and manufacturer. A high quality 2.2μF
aluminum electrolytic capacitor works in most application
circuits, but the same stability often can be obtained with a
1μF tantalum electrolytic.
The SPX5205’s internal reference is available through the
BYP pin.
With the SPX5205 adjustable version, the minimum value of
output capacitance is a function of the output voltage. The
value decreases with higher output voltages, since closed
loop gain is increased.
The Typical Application Circuit shown on page 1 represents
a SPX5205 standard application circuit. The EN (enable)
pin is pulled high (>2.0V) to enable the regulator. To disable
the regulator, EN < 0.4V.
The SPX5205 in Figure 13 illustrates a typical adjustable
output voltage configuration. Two resistors (R1 and R2) set
the output voltage. The output voltage is calculated using
the formula:
VOUT = 1.235V x (1 + R1/R2)
R2 must be >10 kΩ, and for best results, R2 should be
between 22 kΩ and 47kΩ.
VIN
1
2
+
GND
R1
Hi-ON
Lo-OFF
+
SPX5205
3
EN
VOUT
5
4
ADJ
5-pin Adjustable
TOPVi ew
R2
Figure 13. Typical Adjustable Output Voltage
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SPX5205
Mechanical Dimensions
SOT-23-5
FOR REFERENCE ONLY
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SPX5205
Ordering Information(1)
Part Number
Operating
Temperature Range
Lead-Free
Package
Packaging Method
Accuracy
SPX5205M5-L/TR
Adjustable
SPX5205M5-L-1-8/TR
SPX5205M5-L-3-0/TR
Output Voltage
1.8V
-40°C ≤ TJ ≤ 125°C
Yes(2)
5-pin SOT-23
Tape and Reel
1%
3.0V
SPX5205M5-L-3-3/TR
3.3V
SPX5205M5-L-5-0/TR
5.0V
NOTE:
1. Refer to www.exar.com/SPX5205 for most up-to-date Ordering Information.
2. Visit www.exar.com for additional information on Environmental Rating.
Revision History
Revision
Date
K
--
L
8/31/18
Corporate Headquarters:
5966 La Place Court
Suite 100
Carlsbad, CA 92008
Tel.:+1 (760) 692-0711
Fax: +1 (760) 444-8598
www.maxlinear.com
Description
Sipex / Exar legacy datasheet
Update to MaxLinear logo. Update format and Ordering Information. Added Figure numbers.
Corrected CL unit in Figure 11. Updated Typical Application Circuit on page 1 and Figure 13
to differentiate between fixed and adjustable versions. Updated last paragraph of Typical
Applications Circuits section. Updated temperature at top of Electrical Characteristics.
High Performance Analog:
1060 Rincon Circle
San Jose, CA 95131
Tel.: +1 (669) 265-6100
Fax: +1 (669) 265-6101
www.exar.com
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