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19-2732; Rev 1; 6/04
Ultra-Low-Noise, High PSRR, Low-Dropout,120mA Linear Regulators in SC70
General Description
The MAX8510/MAX8511/MAX8512 ultra-low-noise, lowdropout (LDO) linear regulators are designed to deliver up to 120mA continuous output current from a tiny 5-pin SC70 plastic package. These regulators achieve a low 120mV dropout for 120mA load current. The MAX8510 uses an advanced architecture to achieve ultra-low output voltage noise of 11VRMS and PSRR of 54dB at 100kHz. The MAX8511 does not require a bypass capacitor, hence achieving the smallest PC board area. The MAX8512's output voltage can be adjusted with an external divider. The MAX8510/MAX8511 are preset to a variety of voltages in the 1.5V to 4.5V range. Designed with a Pchannel MOSFET series pass transistor, the MAX8510/ MAX8511/MAX8512 maintain very low ground current (40A). The regulators are designed and optimized to work with low-value, low-cost ceramic capacitors. The MAX8510 requires only 1F (typ) of output capacitance for stability with any load. When disabled, current consumption drops to below 1A. Space-Saving 5-Pin SC70 Package 11VRMS Output Noise at 100Hz to 100kHz Bandwidth (MAX8510) 78dB PSRR at 1kHz (MAX8510) 120mV Dropout at 120mA Load Stable with 1F Ceramic Capacitor for Any Load Guaranteed 120mA Output Only Need Input and Output Capacitors (MAX8511) Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 3V, 3.3V, 4.5V (MAX8510/MAX8511) and Adjustable (MAX8512) Low 40A Ground Current Excellent Load/Line Transient Overcurrent and Thermal Protection
Features
MAX8510/MAX8511/MAX8512
Ordering Information
PART* MAX8510EXKxy-T MAX8511EXKXY-T MAX8512EXK-T TEMP RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 5 SC70-5 5 SC70-5 5 SC70-5
Applications
Cellular and Cordless Phones PDA and Palmtop Computers Base Stations Bluetooth Portable Radios and Accessories Wireless LANs Digital Cameras Personal Stereos Portable and Battery-Powered Equipment
*xy is the output voltage code (see Output Voltage Selector Guide). Other versions between 1.5V and 4.5V are available in 100mV increments. Contact factory for other versions. Output Voltage Selector Guide appears at end of data sheet.
Typical Operating Circuits
INPUT 2V TO 6V OUTPUT PRESET 1.5V TO 4.5V
Pin Configuration
TOP VIEW
IN 1 5 OUT
IN
OUT
CIN = 1F ON OFF
MAX8510
SHDN BP CBP = 10nF GND 2 COUT = 1F SHDN 3 4
MAX8510 MAX8511 MAX8512
BP (MAX8510) N.C. (MAX8511) FB (MAX8512)
GND
SC70-5 Typical Operating Circuits continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +7V Output Short-Circuit Duration ............................................Infinite OUT, SHDN to GND ......................................-0.3V to (IN + 0.3V) FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V) Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............0.247W JA (5-Pin SC70) ...............................................................324C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 0.5V, TA = -40C to +85C, unless otherwise noted. CIN = 1F, COUT = 1F, CBP = 10nF. Typical values are at +25C; the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER Input Voltage Range Output Voltage Accuracy Maximum Output Current Current Limit IOUT ILIM OUT = 90% of nominal value VOUT 3V, IOUT = 80mA VOUT 3V, IOUT = 120mA Dropout Voltage (Note 2) 2.5V VOUT < 3V, IOUT = 80mA 2.5V VOUT < 3V, IOUT = 120mA 2V VOUT < 2.5V, IOUT = 80mA 2V VOUT < 2.5V, IOUT = 120mA Ground Current Line Regulation Load Regulation Shutdown Supply Current IQ VLNR VLDR ISHDN IOUT = 0.05mA VIN = VOUT (nom) - 0.1V, IOUT = 0mA VIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA IOUT = 1mA to 80mA SHDN = 0V f = 1kHz, IOUT = 10mA Ripple Rejection PSRR f = 10kHz, IOUT = 10mA f = 100kHz, IOUT = 10mA TA = +25C TA = +85C MAX8510 MAX8511/MAX8512 MAX8510 MAX8511/MAX8512 MAX8510 MAX8511/ MAX8512 SYMBOL VIN IOUT = 1mA, TA = +25C IOUT = 100A to 80mA, TA = +25C IOUT = 100A to 80mA CONDITIONS MIN 2 -1 -2 -3 120 130 200 80 120 90 135 120 180 40 220 0.001 0.003 0.003 0.05 78 72 75 65 54 46 dB 1 90 500 A %/V %/mA A 250 200 mV 300 170 TYP MAX 6 +1 +2 +3 mA mA % UNITS V
2
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT + 0.5V, TA = -40C to +85C, unless otherwise noted. CIN = 1F, COUT = 1F, CBP = 10nF. Typical values are at +25C; the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER Output Noise Voltage (RMS) Shutdown Exit Delay SHDN Logic Low Level SHDN Logic High Level SHDN Input Bias Current FB Input Bias Current (MAX8512) Thermal Shutdown Thermal-Shutdown Hysteresis SYMBOL CONDITIONS f = 100Hz to 100kHz, ILOAD = 10mA f = 100Hz to 100kHz, ILOAD = 80mA RLOAD = 50 (Note3) VIN = 2V to 6V VIN = 2V to 6V VIN = 6V, SHDN = 0V or 6V VIN = 6V,VFB = 1.3V TA = +25C TA = +85C TA = +25C TA = +85C 0.01 0.006 0.01 160 10 0.1 1.5 MAX8510 MAX8511/MAX8512 MAX8510 MAX8511/MAX8512 MIN TYP 11 230 13 230 300 0.4 s V V A A C C V MAX UNITS
MAX8510/MAX8511/MAX8512
Note 1: Limits are 100% tested at +25C. Limits over operating temperature range are guaranteed by design. Note 2: Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. Note 3: Time needed for VOUT to reach 90% of final value.
Typical Operating Characteristics
(VIN = VOUT + 0.5V, CIN = 1F, COUT = 1F, CBP = 10nF, TA = +25C, unless otherwise noted.)
MAX8510 OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT
MAX8510 toc01 MAX8510 toc02
MAX8510 OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0 2.5 OUTPUT VOLTAGE (V) IOUT = 0mA % DEVIATION (%) 0.2 0 -0.2 -0.4 -0.6 0 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) IOUT = 120mA 0.6 0.4
MAX8510 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
0.8 0.6 % DEVIATION (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 IOUT = 1mA
MAX8510 toc03
1.0
20
40
60
80
100
120
-40
-15
10
35
60
85
LOAD CURRENT (mA)
TEMPERATURE (C)
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1F, COUT = 1F, CBP = 10nF, TA = +25C, unless otherwise noted.)
MAX8510 DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8510 toc04
MAX8510 DROPOUT VOLTAGE vs. OUTPUT VOLTAGE
MAX8510 toc05
MAX8510 GROUND PIN CURRENT vs. INPUT VOLTAGE
IOUT = 120mA 300 GROUND PIN CURRENT (A) 250 200 150 100 50 IOUT = 0mA
MAX8510 toc06
150 TA = +85C DROPOUT VOLTAGE (mV) 120 TA = +25C 90
250 IOUT = 80mA DROPOUT VOLTAGE (mV) 200
350
150
60 TA = -40C 30
100
50
0 0 20 40 60 80 100 120 LOAD CURRENT (mA)
0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 OUTPUT (V)
0 0 1 2 3 4 5 INPUT VOLTAGE (V)
MAX8510 GROUND PIN CURRENT vs. LOAD CURRENT
MAX8510 toc 07
MAX8510 GROUND PIN CURRENT vs. TEMPERATURE
MAX8510 toc08
MAX8510 PSRR vs. FREQUENCY
80 70 60 PSRR (dB) 50 40 30
MAX8510 toc09
240 200 160 VIN = 3.8V 120 80 40 0 0 20 40 60 80 100 VIN = 5.5V
50
90
GROUND PIN CURRENT (A)
GROUND PIN CURRENT (A)
45
40
35
20 10 ILOAD = 10mA CBP = 10nF 0.01 0.1 1 10 100 1000
30 120 -40 -15 10 35 60 85 LOAD CURRENT (mA) TEMPERATURE (C)
0 FREQUENCY (kHz)
MAX8511 PSRR vs. FREQUENCY
MAX8510 toc10
MAX8510 OUTPUT NOISE
MAX8510 toc11
MAX8510 OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY
1.E+04 OUTPUT NOISE DENSITY (nV/Hz)
MAX8510 toc12
90 80 70 60 PSRR (dB) 50 40 30 20 10 0 0.01 0.1 1 10 100 ILOAD = 10mA
VIN = 3.8V ILOAD = 10mA VNOISE = 11VRMS
1.E+03
1.E+02
20V/div 1000 400s/div 1.E+01 0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
FREQUENCY (kHz)
4
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1F, COUT = 1F, CBP = 10nF, TA = +25C, unless otherwise noted.)
MAX8510 OUTPUT NOISE vs. BP CAPACITANCE
MAX8510 toc13
MAX8510/MAX8511/MAX8512
MAX8510 LOAD TRANSIENT RESPONSE
MAX8510 toc14
MAX8510 LOAD TRANSIENT RESPONSE NEAR DROPOUT
MAX8510 toc15
25
20 OUTPUT NOISE (V)
VIN = 3.5V ILOAD = 0 TO 50mA
VIN = 3.1V ILOAD = 0 TO 50mA
15
10 VOUT 10mV/div 5 VOUT 10mV/div
0 1 10 BP CAPACITANCE (nF) 100 1ms/div 1ms/div
MAX8510 LINE TRANSIENT RESPONSE
MAX8510 toc16
MAX8510 EXITING SHUTDOWN WAVEFORM
MAX8510 toc17
MAX8510 ENTERING SHUTDOWN DELAY
MAX8510 toc18
VIN = 3.5V TO 4V
SHUTDOWN VOLTAGE
VOUT = 2.85V RLOAD = 47
CBP = 0.01F SHUTDOWN VOLTAGE
OUTPUT VOLTAGE 2V/div VOUT 2mV/div 200s/div 20s/div
OUTPUT VOLTAGE 2V/div
40s/div
MAX8510 SHUTDOWN EXIT DELAY
MAX8510 toc19
MAX8510 REGION OF STABLE COUT ESR vs. LOAD CURRENT
MAX8510 toc20
VOUT = 3V CBP = 100nF VOUT 1V/div COUT ESR ()
100
10
1
SHUTDOWN VOLTAGE
0.1 STABLE REGION 0.01 0 20 40 60 80 100 120 LOAD CURRENT (mA)
20s/div
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512
Pin Description
PIN MAX8510 1 2 3 4 -- -- 5 MAX8511 1 2 3 -- 4 -- 5 MAX8512 1 2 3 -- -- 4 5 NAME IN GND SHDN BP N.C. FB OUT Unregulated Input Supply Ground Shutdown. Pull low to disable the regulator. Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from BP to OUT. It is short to OUT in shutdown mode. Not Internally Connected Adjustable Output Feedback Point Regulated Output Voltage. Bypass with a capacitor to GND. See the Capacitor Selection and Regulator Stability section for more details. FUNCTION
Detailed Description
The MAX8510/MAX8511/MAX8512 are ultra-low-noise, low-dropout, low-quiescent current linear regulators designed for space-restricted applications. The parts are available with preset output voltages ranging from 1.5V to 4.5V in 100mV increments. These devices can supply loads up to 120mA. As shown in the Functional Diagram, the MAX8510/MAX8511 consist of an innovative bandgap core and noise bypass circuit, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The MAX8512 allows for adjustable output with an external feedback network. The 1.225V bandgap reference is connected to the error amplifier's inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. The output voltage is fed back through an internal resistor voltage-divider connected to the OUT pin. An external bypass capacitor connected to BP (MAX8510) reduces noise at the output. Additional blocks include a current limiter, thermal sensor, and shutdown logic.
waste considerable current in dropout when the pass transistor saturates. They also use high base-drive current under heavy loads. The MAX8510/MAX8511/ MAX8512 do not suffer from these problems and consume only 40A of quiescent current in light load and 220A in dropout (see the Typical Operating Characteristics).
Output Voltage Selection
The MAX8510/MAX8511 are supplied with factory-set output voltages from 1.5V to 4.5V, in 100mV increments (see Ordering Information). The MAX8512 features a user-adjustable output through an external feedback network (see the Typical Operating Circuits). To set the output of the MAX8512, use the following equation: VOUT R1 = R2 X - 1 VREF where R2 is chosen to be less than 240k and VREF = 1.225V. Use 1% or better resistors.
Shutdown
The MAX8510/MAX8511/MAX8512 feature a low-power shutdown mode that reduces quiescent current less than 1A. Driving SHDN low disables the voltage reference, error amplifier, gate-drive circuitry, and pass transistor (see the Functional Diagram), and the device output enters a high-impedance state. Connect SHDN to IN for normal operation.
Internal P-Channel Pass Transistor
The MAX8510/MAX8511/MAX8512 feature a 1 (typ) Pchannel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including longer battery life. The P-channel MOSFET requires no base drive, which considerably reduces quiescent current. PNP-based regulators
6
Current Limit
The MAX8510/MAX8511/MAX8512 include a current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 200mA.
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70
For design purposes, consider the current limit to be 130mA (min) to 300mA (max). The output can be shorted to ground for an indefinite amount of time without damaging the part.
Applications Information
Capacitor Selection and Regulator Stability
Use a 1F capacitor on the MAX8510/MAX8511/ MAX8512 input and a 1F capacitor on the output. Larger input capacitor values and lower ESRs provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2F or larger output capacitor to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 1F is sufficient at all operating temperatures. A graph of the region of stable C OUT ESR vs. load current is shown in the Typical Operating Characteristics. Use a 0.01F bypass capacitor at BP (MAX8510) for low-output voltage noise. The leakage current going into the BP pin should be less than 10nA. Increasing the capacitance slightly decreases the output noise. Values above 0.1F and below 0.001F are not recommended.
MAX8510/MAX8511/MAX8512
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX8510/MAX8511/MAX8512. When the junction temperature exceeds TJ = +160C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the IC's junction temperature drops by 10C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8510/MAX8511/MAX8512 in the event of a fault condition. For continual operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C.
Operating Region and Power Dissipation
The MAX8510/MAX8511/MAX8512 maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient, and the rate of airflow. The power dissipation across the device is: P = IOUT (VIN - VOUT) The maximum power dissipation is: PMAX = (TJ - TA) / (JC + CA) where TJ - TA is the temperature difference between the MAX8510/MAX8511/MAX8512 die junction and the surrounding air, JC is the thermal resistance of the package, and CA is the thermal resistance through the PC board, copper traces, and other materials to the surrounding air. The GND pin of the MAX8510/MAX8511/MAX8512 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane.
Noise, PSRR, and Transient Response
The MAX8510/MAX8511/MAX8512 are designed to deliver ultra-low noise and high PSRR, as well as low dropout and low quiescent currents in battery-powered systems. The MAX8510 power-supply rejection is 78dB at 1kHz and 54dB at 100kHz. The MAX8511/MAX8512 PSRR is 72dB at 1kHz and 46dB at 100kHz (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics). When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors, and through passive filtering techniques. The Typical Operating Characteristics show the MAX8510/MAX8511/MAX8512 line- and loadtransient responses.
Noise Reduction
For the MAX8510, an external 0.01F bypass capacitor between BP and OUT with innovative noise bypass scheme reduces output noises dramatically, exhibiting 11VRMS of output voltage noise with C BP = 0.01F and COUT = 1F. Startup time is minimized by a poweron circuit that precharges the bypass capacitor.
Dropout Voltage
A regulator's minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX8510/MAX8511/MAX8512 use a P-channel MOSFET pass transistor, their dropout voltage is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics).
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7
Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512
Functional Diagram
IN
SHDN
SHUTDOWN AND POWER-ON CONTROL ERROR AMP MOS DRIVER WITH ILIMIT
MAX8510 MAX8511 MAX8512
P OUT **
THERMAL SENSOR
1.225V REFERENCE AND NOISE BYPASS **
FB***
GND
*MAX8510 ONLY **MAX8510/MAX8511 ONLY ***MAX8512 ONLY
BP*
8
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Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70
Typical Operating Circuits (continued)
INPUT 2V TO 6V OUTPUT PRESET 1.5V TO 4.5V
Output Voltage Selector Guide
PART MAX8510EXK16-T MAX8510EXK18-T MAX8510EXK25-T MAX8510EXK27-T MAX8510EXK28-T VOUT (V) 1.6 1.8 2.5 2.7 2.8 2.85 3 3.3 4.5 1.5 1.8 2.5 2.6 2.8 2.85 2.9 3.1 3.3 4.5 Adjustable TOP MARK AEX AEA AEB AEC AED ADS ADT AEE AGC ADU AEF ADV AEG AFA AFQ AEH ARS AEI AEJ ADW
MAX8510/MAX8511/MAX8512
IN
OUT
CIN = 1F ON OFF
MAX8511
SHDN COUT = 1F
MAX8510EXK29-T MAX8510EXK30-T MAX8510EXK33-T MAX8510EXK45-T MAX8511EXK15-T MAX8511EXK18-T MAX8511EXK25-T
GND
INPUT 2V TO 6V
IN
OUT
OUTPUT ADJUSTABLE 1.5V TO 4.5V
MAX8511EXK26-T MAX8511EXK28-T MAX8511EXK29-T MAX8511EXK89-T MAX8511EXK31-T MAX8511EXK33-T MAX8511EXK45-T MAX8512EXK-T
CIN = 1F ON OFF
MAX8512
SHDN FB
R1
COUT = 1F R2
GND
(Note: Standard output voltage options, shown in bold, are available. Contact the factory for other output voltages between 1.5V and 4.5V. Minimum order quantity is 15,000 units)
Chip Information
TRANSISTOR COUNT: 284 PROCESS: BiCMOS
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9
Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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