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150mA, LOW-NOISE LDO VOLTAGE REGULATOR
JULY 30, 2008
SPX5205
REV. H
FEATURES
Low Noise Output LDO: 40VRMS Possible 1% Initial Accuracy Very Low Quiecent Current: 70A 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
Fixed Output Voltage
VOUT BYP
5
4
SPX5205
5 Pin SOT-23
1
VIN
2
GND
3
EN
Adjustable Output Voltage
VOUT ADJ/BYP
5
4
SPX5205
5 Pin SOT-23
1
VIN
2
GND
3
EN
APPLICATIONS
PDA Battery Powered Systems Cellular Phone Cordless Telephones Radio Control Systems Laptop, Palmtop, and Notebook Computers
Now Available in Lead Free Packaging
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 (750A 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 batterypowered applications, and where power conservation is desired such as: cellular/ cordless telephones, radio
control systems, and portable computers.
TYPICAL APPLICATION CIRCUIT
VIN
1
5
VOUT
2 + GND 3 EN ENABLE may be tied directly to VIN SPX5205
+ 1.0F
4
BYP (Optn)
TOP View
Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510) 668-7000 * FAX (510) 668-7017 * www.exar.com
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. H
ABSOLUTE MAXIMUM RATINGS
Thermal Shutdown .................................................................... Internally Limited Lead Temperature (Soldering, 5 seconds) ................................................. 260C Operating Junction Temperature Range .................................... -40C to +125C Input Supply Voltage ......................................... -20V to +20V Enable Input Voltage ......................................... -20V to +20V
RECOMMENDED OPERATING CONDITIONS
Input voltage ..................................................................................... +2.5V to 16V Operating Junction Temperature Range .................................... -40C to +125C Enable Input Voltage .............................................................................. 0V to VIN SOT-23-5 ( JA) ................................................................................... See Note 1
ELECTRICAL CHARACTERISTICS
TJ=25C, VIN = VOUT + 1V, IL = 100A, CL = 1F, and VENABLE 2.4V. The denotes the specifications which apply over full temperature range -40C to +85C, unless otherwise specified. PARAMETER Output Voltage Tolerance (VOUT) Output Voltage Temperature Coefficient Line Regulation MIN -1 -2 57 0.03 TYP MAX +1 +2 0.1 0.2
0.2
UNITS %VNOM ppm/C %/V
%/V
CONDITIONS
Load Regulation
0.1
0.2 0.5 1.0 50 70 190 230 250 300 275 350 1 5 125 150 600 800 1000 1500 1900 2500 500
%
VIN = VOUT +1 to 16V and VEN 6V VIN = VEN =VOUT +1 8V VIN = VEN =VOUT +1 to 16V Ta = 25C to 85C VIN = VOUT + 1V 2.5V IL = 1mA to 150mA IL = 100uA to 1mA
Dropout Voltage (See Note 2) (VIN - VO)
30 140 180 210
mV mV mV mV A A
IL = 100A IL = 50mA IL = 100mA IL = 150mA VENABLE 0.4V VENABLE 0.25V IL = 100A IL = 50mA IL = 100mA IL = 150mA
Quiescent Current (IGND) Ground Pin Current (IGND)
0.05 70 350 750 1300
Ripple Rejection (PSRR) Current Limit (ILIMIT) Output Noise (eNO)
70 360 300 40
dB mA VRMS VRMS
VOUT = 0V IL = 10mA, CL = 1F, CIN= 1F (10Hz - 100kHz.) IL = 10mA, CL = 10F, CBYP = 1F,CIN=1F,(10Hz - 100kHz) OFF ON VIL VIH 0.4V 2.0V
Input Voltage Level Logic Low (VIL) Input Voltage Level Logic High (VIL) ENABLE Input Current 2.0 0.01 3
0.4 2 20
V A
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, JA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is given: PD (max) = (TJ (max) - TA)/ JA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown. The JA of the SPX5205 is 220C/W mounted on a PC board. Note 2: Not applicable to output voltages of less than 2V.
2
SPX5205
REV. H
150mA, Low-Noise LDO Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
1.40 1.20 1.00 3.3V Device VIN= 3.2V CL = 1.0F
110 100 90
IGND (mA)
0.80 0.60 0.40 0.20 0.00 0 50 100 150
IGND (A)
80 70 60 50 40 30 4 6 8 10 VO = 3.3V CL = 1.0F IL = 100A
12
14
16
IL (mA)
Ground Current vs Load Current
VIN (V)
Ground Current vs Input Voltage
2.00 3.3V Device VIN= 4.3V CL = 1.0F
3.340 3.335 3.330 3.325
1.50
IGND (mA)
VOUT (V)
3.320 3.315 3.310 3.305 3.3V Device CL= 1.0F IL = 100A
1.00
0.50
3.300 3.295 3.290
0.00 0 50 100 150
4
6
8
10
12
14
16
IL (mA)
Ground Current vs Load Current in Dropout
VIN (V)
Output Voltage vs Input Voltage
3
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. H
TYPICAL PERFORMANCE CHARACTERISTICS
3.310
200
VO=3.3V VIN= 3.2V CL = 1.0F
3.308
3.3V Device VIN= 4.3V CL = 1.0F
Dropout (mV)
150
VOUT (V)
3.306
100
3.304
50
3.302
0 0 50 100 150
3.300 0 50 100 150
IL (mA)
Dropout Voltage vs Load Current
IL (mA)
Output Voltage vs Load Current
90.0 VOUT= 3.3V VIN= 4.3V CL= 1.0F IL = 100A
950
80.0
850
IGND (A)
70.0
IGND (A)
750
650 VOUT = 3.3V VIN = 4.3V CL= 1.0F IL = 100mA -20 0 20 40 60 80 100 120
60.0
550
50.0 -40
-20
0
20
40
60
80
100 120
450 -40
Temperature (C)
Ground Current vs Temperature at ILOAD =100A
Temperature (C)
Ground Current vs Temperature at ILOAD =100mA
4
SPX5205
REV. H
150mA, Low-Noise LDO Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
2.30 2.20 2.10 VOUT= 3.3V VIN= 4.3V CL= 1.0F IL = 150mA
3.400 3.380 3.360 3.340 VOUT= 3.3V VIN= 4.3V CL= 1.0F
IGND (mA)
2.00 1.90 1.80 1.70 1.60 1.50 1.40 -40
VOUT (V)
-20 0 20 40 60 80 100 120
3.320 3.300 3.280 3.260 3.240 3.220 3.200 -40 -20 0 20 40 60 80 100 120
Temperature (C)
Ground Current in Dropout vs Temperature
Temperature (C)
Output Voltage vs Temperature
1.60 1.50 VOUT =3.3V CL= 1.0A IL = 100A
350 300 250 200 150 100
VEN, On Threshold (V)
1.40 1.30 1.20 1.10 1.00 0.90 0.80 4 6 8 10 12 14 16
uV RMS
Cin = 1uFT, Cout = 1uFT Cin = 1uFT, Cout = 2.2uFT Cin = 1uFT Cout = 10uFT
50 0
1
10
100 1000 10000 Bypass Cap (pF)
100000 1000000
VIN (V)
ENABLE Voltage, ON threshold vs Input Voltage Output Noise vs. Bypass Capacitor Value
5
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. H
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 2.2F aluminum electrolytic capacitor works in most application circuits, but the same stability often can be obtained with a 1F 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
portional 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 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 k and for best results, R2 should be between 22 k and 47k . A capacitor placed between adjustable and ground will provide improved noise performance.
A 10nF capacitor on 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 pro-
VIN
1
5
VOUT
2 + GND 3 EN Hi-ON Lo-OFF BYP (Optn) SPX5205
R1
+
4
ADJ
R2
TOP View
Figure 1. Typical Adjustable Output Voltage.
6
SPX5205
REV. H
150mA, Low-Noise LDO Voltage Regulator
7
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. H
ORDERING INFORMATION
PART NUMBER TOP MARK ACC. OUTPUT VOLTAGE PACKAGE
SPX5205M5-L.............. H1WW ................. 1% ...................... Adj ................... 5 Pin SOT-23 SPX5205M5-L/TR ........ H1WW ................. 1% ...................... Adj ................... 5 Pin SOT-23 SPX5205M5-L-1-2 ......... R12 ................... 1% ..................... 1.2V .................. 5 Pin SOT-23 SPX5205M5-L-1-2/TR .... R12 ................... 1% ..................... 1.2V .................. 5 Pin SOT-23 SPX5205M5-L-1-5 ......... R15 ................... 1% ..................... 1.5V .................. 5 Pin SOT-23 SPX5205M5-L-1-5/TR .... R15 ................... 1% ..................... 1.5V .................. 5 Pin SOT-23 SPX5205M5-L-1-8 ......... R18 ................... 1% ..................... 1.8V .................. 5 Pin SOT-23 SPX5205M5-L-1-8/TR .... R18 ................... 1% ..................... 1.8V .................. 5 Pin SOT-23 SPX5205M5-L-2-0 ......... R20 ................... 1% ..................... 2.0V .................. 5 Pin SOT-23 SPX5205M5-L-2-0/TR .... R20 ................... 1% ..................... 2.0V .................. 5 Pin SOT-23 SPX5205M5-L-2-5 ......... R25 ................... 1% ..................... 2.5V .................. 5 Pin SOT-23 SPX5205M5-L-2-5/TR .... R25 ................... 1% ..................... 2.5V .................. 5 Pin SOT-23 SPX5205M5-L-2-8 ......... R28 ................... 1%......................2.8V................... 5 Pin SOT-23 SPX5205M5-L-2-8/TR .... R28 ................... 1%......................2.8V................... 5 Pin SOT-23 SPX5205M5-L-3-0...........R30.....................1% .....................3.0V................... 5 PIN SOT-23 SPX5205M5-L-3-0/TR.....R30.....................1% .....................3.0V................... 5 PIN SOT-23 SPX5205M5-L-3-3 ......... R33 ................... 1% ..................... 3.3V .................. 5 Pin SOT-23 SPX5205M5-L-3-3/TR .... R33 ................... 1% ..................... 3.3V .................. 5 Pin SOT-23 SPX5205M5-L-5-0 ......... R50 ................... 1% ..................... 5.0V .................. 5 Pin SOT-23 SPX5205M5-L-5-0/TR .... R50 ................... 1% ..................... 5.0V .................. 5 Pin SOT-23
All Packaging is lead free. A bar is added to indicate lead-free parts and can be mistaken as a "1" or an "I". /TR = Tape and Reel. Pack quantity is 2,500 for 5pin SOT-23
For further assistance: Email: EXAR Technical Documentation: customersupport@exar.com 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.
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