19-2732; Rev 1; 6/04 Ultra-Low-Noise, High PSRR, Low-Dropout,120mA Linear Regulators in SC70 Features 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 11µVRMS 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. ♦ Space-Saving 5-Pin SC70 Package 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 (40µA). ♦ 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) The regulators are designed and optimized to work with low-value, low-cost ceramic capacitors. The MAX8510 requires only 1µF (typ) of output capacitance for stability with any load. When disabled, current consumption drops to below 1µA. ♦ Excellent Load/Line Transient 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 ♦ 11µVRMS Output Noise at 100Hz to 100kHz Bandwidth (MAX8510) ♦ 78dB PSRR at 1kHz (MAX8510) ♦ 120mV Dropout at 120mA Load ♦ Stable with 1µF Ceramic Capacitor for Any Load ♦ Guaranteed 120mA Output ♦ Only Need Input and Output Capacitors (MAX8511) ♦ Low 40µA Ground Current ♦ Overcurrent and Thermal Protection Ordering Information TEMP RANGE PIN-PACKAGE MAX8510EXKxy-T PART* -40°C to +85°C 5 SC70-5 MAX8511EXKxy-T -40°C to +85°C 5 SC70-5 MAX8512EXK-T -40°C to +85°C 5 SC70-5 *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. Pin Configuration Typical Operating Circuits INPUT 2V TO 6V CIN = 1µF ON OFF IN OUT OUTPUT PRESET 1.5V TO 4.5V TOP VIEW IN 1 5 OUT 4 BP (MAX8510) N.C. (MAX8511) FB (MAX8512) MAX8510 BP SHDN GND CBP = 10nF GND 2 MAX8510 MAX8511 MAX8512 COUT = 1µF SHDN 3 SC70-5 Typical Operating Circuits continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX8510/MAX8511/MAX8512 General Description MAX8510/MAX8511/MAX8512 Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 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 = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............0.247W θJA (5-Pin SC70) ...............................................................324°C/W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C; the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1) PARAMETER Input Voltage Range SYMBOL Output Voltage Accuracy Maximum Output Current IOUT Current Limit ILIM Dropout Voltage (Note 2) Ground Current CONDITIONS MAX UNITS 2 6 V IOUT = 1mA, TA = +25°C -1 +1 IOUT = 100µA to 80mA, TA = +25°C -2 +2 IOUT = 100µA to 80mA -3 +3 VIN IQ MIN TYP 120 OUT = 90% of nominal value 130 % mA 200 300 VOUT ≥ 3V, IOUT = 80mA 80 170 VOUT ≥ 3V, IOUT = 120mA 120 2.5V ≤ VOUT < 3V, IOUT = 80mA 90 2.5V ≤ VOUT < 3V, IOUT = 120mA 135 2V ≤ VOUT < 2.5V, IOUT = 80mA 120 2V ≤ VOUT < 2.5V, IOUT = 120mA 180 200 mA mV 250 IOUT = 0.05mA 40 90 VIN = VOUT (nom) - 0.1V, IOUT = 0mA 220 500 µA Line Regulation VLNR VIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA 0.001 %/V Load Regulation VLDR IOUT = 1mA to 80mA 0.003 %/mA Shutdown Supply Current ISHDN SHDN = 0V f = 1kHz, IOUT = 10mA Ripple Rejection PSRR f = 10kHz, IOUT = 10mA f = 100kHz, IOUT = 10mA 2 TA = +25°C 0.003 TA = +85°C 0.05 MAX8510 1 µA 78 MAX8511/MAX8512 72 MAX8510 75 MAX8511/MAX8512 65 MAX8510 54 MAX8511/ MAX8512 46 _______________________________________________________________________________________ dB Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 (VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C; the MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS Output Noise Voltage (RMS) MIN TYP f = 100Hz to 100kHz, ILOAD = 10mA MAX8510 11 MAX8511/MAX8512 230 f = 100Hz to 100kHz, ILOAD = 80mA MAX8510 13 MAX8511/MAX8512 230 MAX UNITS µV Shutdown Exit Delay RLOAD = 50Ω (Note3) 300 µs SHDN Logic Low Level VIN = 2V to 6V 0.4 V SHDN Logic High Level VIN = 2V to 6V SHDN Input Bias Current VIN = 6V, SHDN = 0V or 6V FB Input Bias Current (MAX8512) VIN = 6V,VFB = 1.3V 1.5 V TA = +25°C TA = +85°C 0.01 TA = +25°C 0.006 TA = +85°C 0.01 µA 0.1 µA Thermal Shutdown 160 °C Thermal-Shutdown Hysteresis 10 °C Note 1: Limits are 100% tested at +25°C. 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 = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.) MAX8510 OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT 1.0 MAX8510 toc02 2.5 0.4 0.8 1.5 IOUT = 120mA 1.0 0.5 % DEVIATION (%) 2.0 0.2 0 -0.2 IOUT = 1mA 0.6 IOUT = 0mA % DEVIATION (%) OUTPUT VOLTAGE (V) 0.6 MAX8510 toc01 3.0 MAX8510 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE MAX8510 toc03 MAX8510 OUTPUT VOLTAGE vs. INPUT VOLTAGE 0.4 0.2 0 -0.2 -0.4 -0.6 -0.4 -0.8 0.0 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 -0.6 -1.0 0 20 40 60 80 LOAD CURRENT (mA) 100 120 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX8510/MAX8511/MAX8512 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.) 60 TA = -40°C 30 350 200 IOUT = 120mA 300 GROUND PIN CURRENT (µA) TA = +25°C 90 MAX8510 GROUND PIN CURRENT vs. INPUT VOLTAGE MAX8510 toc05 120 IOUT = 80mA DROPOUT VOLTAGE (mV) TA = +85°C DROPOUT VOLTAGE (mV) 250 MAX8510 toc04 150 MAX8510 DROPOUT VOLTAGE vs. OUTPUT VOLTAGE 150 100 50 MAX8510 toc06 MAX8510 DROPOUT VOLTAGE vs. LOAD CURRENT 250 200 150 100 IOUT = 0mA 50 0 0 0 20 40 60 80 100 0 2.0 2.2 2.4 2.6 2.8 3.2 3.0 0 3 4 5 100 1000 MAX8510 GROUND PIN CURRENT vs. LOAD CURRENT MAX8510 GROUND PIN CURRENT vs. TEMPERATURE MAX8510 PSRR vs. FREQUENCY VIN = 3.8V 120 80 MAX8510 toc09 MAX8510 toc08 90 80 70 45 60 PSRR (dB) 160 50 GROUND PIN CURRENT (µA) VIN = 5.5V 40 50 40 30 35 20 40 ILOAD = 10mA CBP = 10nF 10 30 0 0 20 40 60 80 100 120 0 -40 -15 10 35 60 85 0.01 1 10 TEMPERATURE (°C) FREQUENCY (kHz) MAX8511 PSRR vs. FREQUENCY MAX8510 OUTPUT NOISE MAX8510 OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY MAX8510 toc11 70 VIN = 3.8V ILOAD = 10mA VNOISE = 11µVRMS 60 50 40 30 20 ILOAD = 10mA 1.E+03 1.E+02 20µV/div 0 0.1 MAX8510 toc12 1.E+04 OUTPUT NOISE DENSITY (nV/√Hz) MAX8510 toc10 80 0.01 0.1 LOAD CURRENT (mA) 90 1 10 FREQUENCY (kHz) 4 2 INPUT VOLTAGE (V) 200 10 1 OUTPUT (V) MAX8510 toc 07 GROUND PIN CURRENT (µA) 120 LOAD CURRENT (mA) 240 PSRR (dB) MAX8510/MAX8511/MAX8512 Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 100 1000 400µs/div 1.E+01 0.01 0.1 1 10 FREQUENCY (kHz) _______________________________________________________________________________________ 100 1000 Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 (VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.) MAX8510 OUTPUT NOISE vs. BP CAPACITANCE MAX8510 LOAD TRANSIENT RESPONSE NEAR DROPOUT MAX8510 toc14 MAX8510 toc13 25 20 MAX8510 toc15 VIN = 3.5V ILOAD = 0 TO 50mA VIN = 3.1V ILOAD = 0 TO 50mA 15 10 VOUT 10mV/div VOUT 10mV/div 5 0 10 1ms/div 100 1ms/div BP CAPACITANCE (nF) MAX8510 LINE TRANSIENT RESPONSE MAX8510 ENTERING SHUTDOWN DELAY MAX8510 EXITING SHUTDOWN WAVEFORM MAX8510 toc16 MAX8510 toc18 MAX8510 toc17 VIN = 3.5V TO 4V SHUTDOWN VOLTAGE VOUT = 2.85V RLOAD = 47Ω CBP = 0.01µF SHUTDOWN VOLTAGE OUTPUT VOLTAGE 2V/div OUTPUT VOLTAGE 2V/div VOUT 2mV/div 200µs/div 20µs/div 40µs/div MAX8510 REGION OF STABLE COUT ESR vs. LOAD CURRENT MAX8510 SHUTDOWN EXIT DELAY MAX8510 toc19 100 VOUT = 3V CBP = 100nF VOUT 1V/div SHUTDOWN VOLTAGE MAX8510 toc20 1 10 COUT ESR (Ω) OUTPUT NOISE (µV) MAX8510 LOAD TRANSIENT RESPONSE 1 0.1 STABLE REGION 20µs/div 0.01 0 20 40 60 80 100 120 LOAD CURRENT (mA) _______________________________________________________________________________________ 5 MAX8510/MAX8511/MAX8512 Typical Operating Characteristics (continued) MAX8510/MAX8511/MAX8512 Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 Pin Description PIN NAME MAX8510 MAX8511 MAX8512 1 1 1 IN 2 2 2 GND 3 3 3 SHDN 4 — — BP — 4 — N.C. — — 4 FB 5 5 5 OUT FUNCTION 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. 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. Internal P-Channel Pass Transistor The MAX8510/MAX8511/MAX8512 feature a 1Ω (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 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 40µA of quiescent current in light load and 220µA 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 240kΩ 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 1µA. 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. 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. _______________________________________________________________________________________ Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX8510/MAX8511/MAX8512. When the junction temperature exceeds TJ = +160°C, 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 10°C, 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 = +150°C. 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) / (θJC + θCA) where TJ - TA is the temperature difference between the MAX8510/MAX8511/MAX8512 die junction and the surrounding air, θJC is the thermal resistance of the package, and θCA 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 Reduction For the MAX8510, an external 0.01µF bypass capacitor between BP and OUT with innovative noise bypass scheme reduces output noises dramatically, exhibiting 11µVRMS of output voltage noise with C BP = 0.01µF and COUT = 1µF. Startup time is minimized by a poweron circuit that precharges the bypass capacitor. Applications Information Capacitor Selection and Regulator Stability Use a 1µF capacitor on the MAX8510/MAX8511/ MAX8512 input and a 1µF 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 2.2µF or larger output capacitor to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1µF 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 0.01µF 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 0.1µF and below 0.001µF are not recommended. 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. 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). _______________________________________________________________________________________ 7 MAX8510/MAX8511/MAX8512 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. Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 MAX8510/MAX8511/MAX8512 Functional Diagram IN SHDN SHUTDOWN AND POWER-ON CONTROL MAX8510 MAX8511 MAX8512 ERROR AMP MOS DRIVER WITH ILIMIT P OUT ** THERMAL SENSOR 1.225V REFERENCE AND NOISE BYPASS FB*** ** GND *MAX8510 ONLY **MAX8510/MAX8511 ONLY ***MAX8512 ONLY 8 BP* _______________________________________________________________________________________ Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 INPUT 2V TO 6V IN OUT CIN = 1µF ON OFF OUTPUT PRESET 1.5V TO 4.5V MAX8511 SHDN COUT = 1µF GND INPUT 2V TO 6V CIN = 1µF ON OFF IN OUT OUTPUT ADJUSTABLE 1.5V TO 4.5V R1 MAX8512 FB SHDN GND COUT = 1µF R2 Output Voltage Selector Guide PART VOUT (V) TOP MARK MAX8510EXK16-T 1.6 AEX MAX8510EXK18-T 1.8 AEA MAX8510EXK25-T 2.5 AEB MAX8510EXK27-T 2.7 AEC MAX8510EXK28-T 2.8 AED MAX8510EXK29-T 2.85 ADS MAX8510EXK30-T 3 ADT MAX8510EXK33-T 3.3 AEE MAX8510EXK45-T 4.5 AGC MAX8511EXK15-T 1.5 ADU MAX8511EXK18-T 1.8 AEF MAX8511EXK25-T 2.5 ADV MAX8511EXK26-T 2.6 AEG MAX8511EXK28-T 2.8 AFA MAX8511EXK29-T 2.85 AFQ MAX8511EXK89-T 2.9 AEH MAX8511EXK31-T 3.1 ARS MAX8511EXK33-T 3.3 AEI MAX8511EXK45-T 4.5 AEJ MAX8512EXK-T Adjustable ADW (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 _______________________________________________________________________________________ 9 MAX8510/MAX8511/MAX8512 Typical Operating Circuits (continued) 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 MAX8510/MAX8511/MAX8512 Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators in SC70 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 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.