1
Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
150mA, Lo w-Noise LDO Volta ge Regulator
SPX5205
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 Fix Output Voltages:1.2V, 1.5V,
1.8V, 2.0V, 2.5V, 2.8V, 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 AS3815
®
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 1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 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 battery-
powered applications, and where power conservation is desired such as: cellular/ cordless telephones, radio
control systems, and portable computers.
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
+
+
GND
EN BYP
(Optn)
ENABLE may be tied directly to V
IN
SPX5205
1
2
34
5
V
IN
V
OUT
TOP Vie w
1.0µF
TYPICAL APPLICATION CIRCUIT
54
123
SPX5205
5 Pin SOT-23
V
IN
BYP
GND EN
V
OUT
54
123
SPX5205
5 Pin SOT-23
V
IN
ADJ/BYP
GND EN
V
OUT
Fixed Output Voltage
Adjustable Output Voltage
2
Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
Thermal Shutdown .................................................................... Internally Limited
Lead Temperature (Soldering, 5 seconds) ................................................. 260°C
Operating Junction Temperature Range .................................... -40°C to +125°C
ELECTRICAL CHARACTERISTICS
TJ=25°C, VIN = VOUT + 1V, IL = 100µA, CL = 1µF, and VENABLE ≥ 2.4V. The ♦ denotes the specifications which
apply over full temperature range -40°C to +85°C, unless otherwise specified.
PARAMETER MIN TYP MAX UNITS CONDITIONS
Output Voltage Tolerance (VOUT)-1 +1%V
NOM
-2 +2 ♦
Output Voltage Temperature Coefficient 57 ppm/°C♦
Line Regulation 0.03 0.1 %/V VIN = VOUT + 1V to 16V
0.2 ♦
Load Regulation 0.1 0.2 % IL = 0.1mA to 150mA
0.5 ♦
Dropout Voltage (See Note 2) 30 50 mV IL = 100µA
(VIN - VO)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 µAV
ENABLE ≤ 0.4V
5♦VENABLE ≤ 0.25V
Ground Pin Current 70 125 µAI
L = 100µA
(IGND)150 ♦
350 600 IL = 50mA
800 ♦
750 1000 IL = 100mA
1500 ♦
1300 1900 IL = 150mA
2500 ♦
Ripple Rejection (PSRR) 70 dB
Current Limit (ILIMIT)360 500 mA VOUT = 0V
Output Noise (eNO)300 µVRMS IL = 10mA, CL = 1µF, CIN= 1µF
(10Hz - 100kHz.)
40 µVRMS IL = 10mA, CL = 10µF, CBYP =
1µF,CIN=1µF,(10Hz - 100kHz)
Input Voltage Level 0.4 V OFF
Logic Low (VIL)
Input Voltage Level 2.0 ON
Logic High (VIL)
ENABLE Input Current 0.01 2 µAV
IL ≤ 0.4V
320 V
IH ≥ 2.0V
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ......................................... -20V to +20V
Enable Input Voltage ......................................... -20V to +20V
Input voltage.....................................................................................+2.5V to 16V
Operating Junction Temperature Range .................................... -40°C to +125°C
Enable Input Voltage .............................................................................. 0V to VIN
SOT-23-5 (θJA)................................................................................... See Note 1
RECOMMENDED OPERATING CONDITIONS
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 SPX5205 is 220°C/W mounted on a PC board.
Note 2: Not applicable to output voltages of less than 2V.
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Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Ground Current vs Load Current Ground Current vs Input Voltage
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00 050100 150
IL (mA)
IGND (mA)
3.3V Device
VIN= 3.2V
CL = 1.0µF
110
100
90
80
70
60
50
40
30 46810121416
V
IN
(V)
I
GND
(µA)
V
O
= 3.3V
C
L
= 1.0µF
I
L
= 100µA
Ground Current vs Load Current in Dropout Output Voltage vs Input Voltage
2.00
1.50
1.00
0.50
0.00 050100 150
IL (mA)
IGND (mA)
3.3V Device
VIN= 4.3V
CL = 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
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Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
Dropout Voltage vs Load Current Output Voltage vs Load Current
Ground Current vs Temperature at ILOAD =100µAGround Current vs Temperature at ILOAD =100mA
200
150
100
50
0050100 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 050100 150
IL (mA)
VOUT (V)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
90.0
80.0
70.0
60.0
50.0-40 -20 0 20 40 60 80 100 120
Temperature (°C)
I
GND
(µA)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0µF
I
L
= 100µA
950
850
750
650
550
450
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
IGND (µA)
VOUT = 3.3V
VIN = 4.3V
CL= 1.0µF
IL = 100mA
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
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Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
Ground Current in Dropout vs Temperature Output Voltage vs Temperature
ENABLE Voltage, ON threshold vs Input Voltage Output Noise vs. Bypass Capacitor Value
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
1.50
1.40
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
I
GND
(mA)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0µF
I
L
= 150mA
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80 46810121416
V
IN
(V)
V
EN,
On Threshold
(V)
V
OUT
=3.3V
C
L
= 1.0µA
I
L
= 100µA
3.400
3.380
3.360
3.340
3.320
3.300
2.280
2.260
2.240
2.220
2.200
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
V
OUT
(V)
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0µF
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
0
50
100
150
200
250
300
350
110100 1000 10000 100000 1000000
Bypass Cap (pF)
uV RMS
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
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Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
+
+
GND
EN
BYP
(Optn)
Hi-ON
Lo-OFF
SPX5205
1
2
34
5
V
IN
V
OUT
R1
R2
ADJ
TOP View
Figure 1. Typical Adjustable Output Voltage.
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 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.
With the SPX5205 adjustable version, the mini-
mum 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 BYP pin will significantly
reduce output noise but it may be left uncon-
nected if the output noise is not a major concern.
The SPX5205 start-up speed is inversely pro-
portional to the size of the BYP capacitor. Ap-
plications requiring a slow ramp-up of the out-
put voltage should use a larger CBYP. However,
if a rapid turn-on is necessary, the BYP capaci-
tor 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 1 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. A capacitor
placed between adjustable and ground will pro-
vide improved noise performance.
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Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
PACKAGE: 5 PIN SOT-23
AA2
A1
SIDE VIEW
D
E
E/2
e1
N/22
1
b
e
E1
E1/2
NN/2
+1
L1
L
L2
4X
Ø1
Seating Plane
Gauge Plane
VIEW C
SEE VIEW C
H
B
B
c
WITH PLATING
BASE METAL
b
Ø1 Ø
- - 1.45
0 - 0.15
Dimensions in (mm) 5 PIN SOT-23
JEDEC MO-178
(AA) Variation
0.90 1.15 1.30
0.30 - 0.50
0.08 - 0.22
2.90 BSC
2.80 BSC
1.60 BSC
0.30 0.45 0.60
0.60 REF
0º 4º 8º
A
A1
A2
b
c
D
E
E1
L
L1
L2
Ø
5º 10º 15º
Ø1
MIN NOM MAX
0.25 BSC
e
e1 1.90 BSC
0.95 BSC
5 PIN SOT-23
8
Rev.B Date:12/23/03 SPX5205 150mA, Low Noise LDO Voltage Regulator © Copyright 2003 Sipex Corporation
ORDERING INFORMATION
PART NUMBER TOP MARK ACC. OUTPUT VOLTAGE PACKAGE
SPX5205M5.............. H1WW................. 1%...................... Adj ...................5 Pin SOT-23
SPX5205M5-1.2 ..........R12 ................... 1%..................... 1.2V ..................5 Pin SOT-23
SPX5205M5-1.5 ..........R15 ................... 1%..................... 1.5V ..................5 Pin SOT-23
SPX5205M5-1.8 ..........R18 ................... 1%..................... 1.8V ..................5 Pin SOT-23
SPX5205M5-2.0 ..........R20 ................... 1%..................... 2.0V ..................5 Pin SOT-23
SPX5205M5-2.5 ..........R25 ................... 1%..................... 2.5V ..................5 Pin SOT-23
SPX5205M5-2.8 ..........R28 ................... 1%......................2.8V...................5 Pin SOT-23
SPX5205M5-3.0............R30.....................1% .....................3.0V...................5 PIN SOT-23
SPX5205M5-3.3 ..........R33 ................... 1%..................... 3.3V ..................5 Pin SOT-23
SPX5205M5-5.0 ..........R50 ................... 1%..................... 5.0V ..................5 Pin SOT-23
Corporation
ANALOG EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
