150mA, Low-Noise LDO Voltage Regulator
SPX5205
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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
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
Description
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 o󰀨-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.
Ordering Information - Back Page
Typical Applications Circuit
3
21
Fixed Output Voltage
SPX5205
54
3
21
Top View
54
BYP
V
OUT
ADJ
V
OUT
EN EN
GND GND
V
IN
V
IN
Top View
Adjustable Output Voltage
SPX5205
+
+
GND
EN BYP
ENABLE may be tied directly to V
IN
SPX5205
1
2
3 4
5
V
IN
V
OUT
TOP View
1.0 µF
5-pin Fixed
SPX5205
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Absolute Maximum 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.
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 MIN. TYP. MAX. UNITS •CONDITIONS
Output voltage tolerance (VOUT)
-1 +1
%VNOM
-2 +2 •
Output voltage temperature
coe󰀩cient 57 ppm/°C •
Line regulation
0.03 0.1
%/V
VIN = VOUT + 1 to 16V and VEN ≤ 6V
0.2 •VIN = VEN = VOUT + 1 ≤ 8V
0.2 VIN = VEN = VOUT + 1 to 16V
TA = 25°C to 85°C
Load regulation
0.1 0.2
%
VIN = VOUT + 1 ≥ 2.5V
0.5 •IL= 1mA to 150mA
1.0 •IL= 100µA to 1mA
Dropout voltage(2)
(VIN - VO)
30 50
mV IL= 100µA
70 •
140 190
mV IL= 50mA
230 •
180 250
mV IL= 100mA
300 •
210 275
mV IL= 150mA
350 •
Quiescent current (IGND)
0.05 1
µA
VENABLE ≤ 0.4V
5•VENABLE ≤ 0.25V
Ground pin current (IGND)
70 125
µA IL= 100µA
150 •
350 600
µA IL= 50mA
800 •
750 1000
µA IL= 100mA
1500 •
1300 1900
µA IL= 150mA
2500 •
Recommended Operating Conditions
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
SPX5205
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PARAMETER MIN. TYP. MAX. UNITS •CONDITIONS
Ripple rejection 70 dB
Current limit (ILIMIT) 360 500 mA VOUT = 0V
Output noise (eNO)
300
µVRMS
IL = 10mA, CL = 1µF, CIN = 1µF
(10Hz - 100kHz)
40 IL = 10mA, CL = 10µF, CBYP = 1µF,
CIN = 1µF (10Hz - 100kHz)
Input voltage level logic low (VIL) 0.4 V OFF
Input voltage level logic high (VIL) 2.0 V ON
Enable input current 0.01 2µA VIL ≤ 0.4V
320 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.
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.
SPX5205
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Figure 1. Ground Current vs. Load Current
Typical Performance Characteristics
Figure 3. Ground Current vs. Load Current in Dropout
Figure 2. Ground Current vs. Input Voltage
Figure 4. Output Voltage vs. Input Voltage
Figure 5. Dropout Voltage vs. Load Current Figure 6. Output Voltage vs. Load Current
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
050 100 150
I
L
(mA)
I
GND
(mA)
3.3V Device
V
IN
= 3.2V
C
L
= 1.0μF
110
100
90
80
70
60
50
40
30 46810121416
VIN (V)
IGND (µA)
V
O
= 3.3V
C
L
= 1.0µF
I
L
= 100μA
2.00
1.50
1.00
0.50
0.00
050 100 150
I
L
(mA)
I
GND
(mA)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
3.300
3.295
3.290
46 810121416
VIN (V)
VOUT (V)
3.3V Device
CL= 1.0μF
IL = 100μA
200
150
100
50
0
050 100 150
I
L
(mA)
Dropout (mV)
V
O
=3.3V
V
IN
= 3.2V
C
L
= 1.0µF
3.310
3.308
3.306
3.304
3.302
3.300
050 100 150
IL (mA)
VOUT (V)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
SPX5205
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Typical Performance Characteristics (Continued)
Figure 7. Ground Current vs. Temperature
at ILOAD = 100μA
Figure 9. Ground Current in Dropout vs. Temperature
Figure 11. ENABLE Voltage,
ON Threshold vs. Input Voltage
Figure 8. Ground Current vs. Temperature
at ILOAD = 100mA
Figure 10. Output Voltage vs. Temperature
Figure 12. Output Noise vs. Bypass Capacitor Value
90.0
80.0
70.0
60.0
50.0
-40-20 020406080 100 120
Temperature (°C)
IGND (mA)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
L
= 100μA
950
850
750
650
550
450
-40-20 020406080 100 120
Temperature (°C)
IGND (μA)
VOUT = 3.3V
VIN = 4.3V
CL= 1.0μF
IL = 100mA
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
1.50
1.40
-40-20 020406080 100 120
Temperature (°C)
IGND (mA)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
L
= 150mA
3.400
3.380
3.360
3.340
3.320
3.300
2.280
2.260
2.240
2.220
2.200
-40-20 020406080 100 120
Temperature (°C)
V
OUT
(V)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
0
50
100
150
200
250
300
350
110 100 1000 10000 100000 1000000
Bypass Cap (pF)
uV RMS
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
SPX5205
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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.
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.
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.
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.
The SPX5205’s internal reference is available through the
BYP pin.
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.
+
+
GND
EN
Hi-ON
Lo-OFF
SPX5205
1
2
34
5
V
IN
V
OUT
R1
R2
ADJ
TOP View
5-pin Adjustable
Figure 13. Typical Adjustable Output Voltage
SPX5205
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Mechanical Dimensions
SOT-23-5
FOR REFERENCE ONLY
SPX5205
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Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated.
© 2001 - 2018 MaxLinear, Inc. All rights reserved
SPX5205_DS_083118 8/8
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Corporate Headquarters:
5966 La Place Court
Suite 100
Carlsbad, CA 92008
Tel.:+1 (760) 692-0711
Fax: +1 (760) 444-8598
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High Performance Analog:
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Tel.: +1 (669) 265-6100
Fax: +1 (669) 265-6101
www.exar.com
Ordering Information(1)
Part Number Operating
Temperature Range Lead-Free Package Packaging Method Accuracy Output Voltage
SPX5205M5-L/TR
-40°C ≤ TJ ≤ 125°C Yes(2) 5-pin SOT-23 Tape and Reel 1%
Adjustable
SPX5205M5-L-1-8/TR 1.8V
SPX5205M5-L-3-0/TR 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 Description
K-- Sipex / Exar legacy datasheet
L8/31/18
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 di󰀨erentiate between xed and adjustable versions. Updated last paragraph of Typical
Applications Circuits section. Updated temperature at top of Electrical Characteristics.