19-1302; Rev 1; 3/98 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 ________________________Applications Modems Cordless Telephones Hand-Held Instruments PCS Telephones Palmtop Computers PCMCIA Cards Electronic Planners __________________Pin Configuration TOP VIEW 5 BP IN 3 4 OUT SOT23-5 __________Typical Operating Circuit INPUT 2.5V TO 6.5V IN CIN 1µF ON OUT MAX8867 MAX8868 SHDN OFF CBP 0.01µF BP GND COUT 1µF ♦ Low 55mV Dropout at 50mA Output (165mV at 150mA output) ♦ Low 85µA No-Load Supply Current ♦ Low 100µA Operating Supply Current (even in dropout) ♦ Thermal-Overload and Short-Circuit Protection ♦ Reverse Battery Protection ♦ Output Current Limit ♦ Preset Output Voltages (±1.4% accuracy) ♦ 10nA Logic-Controlled Shutdown ______________Ordering Information MAX8867C/Dxy MAX8867EUKxy-T MAX8868C/Dxy MAX8868EUKxy-T TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 5 SOT23-5 Dice* 5 SOT23-5 * Dice are tested at TA = +25°C. **xy is the output voltage code (see Expanded Ordering Information table). ___Expanded Ordering Information MAX8867 MAX8868 GND 2 ♦ Low Output Noise: 30µVRMS PART** Cellular Telephones SHDN 1 ____________________________Features OUTPUT PRESET 2.5V TO 5.0V 150mA OUTPUT VOLTAGE (xy) CODE PRESET OUTPUT VOLTAGE (V) MAX8867 MAX8868 MAX886_EUK25 2.50 ACAY ACBF MAX886_EUK28 2.80 ACAZ ACBG MAX886_EUK29 2.84 ACBA ACBH MAX886_EUK30 3.00 ACBB ACBI MAX886_EUK32 3.15 ACBC ACBJ MAX886_EUK33 3.30 ACBD ACBK MAX886_EUK36 3.60 ACCZ ACDA MAX886_EUK50 5.00 ACBE ACBL Other xy*** x.y0 — — SOT TOP MARK ***Other xy between 2.5V and 5.0V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 25,000 units. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX8867/MAX8868 _______________General Description The MAX8867/MAX8868 low-noise, low-dropout linear regulators operate from a 2.5V to 6.5V input and deliver up to 150mA. Typical output noise for these devices is just 30µVRMS, and typical dropout is only 165mV at 150mA. The output voltage is preset to voltages in the range of 2.5V to 5.0V, in 100mV increments. The MAX8867 and MAX8868 are pin-compatible with the MAX8863 and MAX8864, except for the BP pin. Designed with an internal P-channel MOSFET pass transistor, the MAX8867/MAX8868 maintain a low 100µA supply current, independent of the load current and dropout voltage. Other features include a 10nA logic-controlled shutdown mode, short-circuit and thermal-shutdown protection, and reverse battery protection. The MAX8868 also includes an auto-discharge function, which actively discharges the output voltage to ground when the device is placed in shutdown. Both devices come in a miniature 5-pin SOT23 package. MAX8867/MAX8868 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 ABSOLUTE MAXIMUM RATINGS IN to GND ....................................................................-7V to +7V Output Short-Circuit Duration ............................................Infinite SHDN to GND..............................................................-7V to +7V SHDN to IN ...............................................................-7V to +0.3V OUT, BP to GND ..........................................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C θJB ..................................................................................140°C/W Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+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(NOMINAL) + 0.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage (Note 2) SYMBOL CONDITIONS VIN IOUT = 0mA, TA = +25°C Output Voltage Accuracy IOUT = 0mA to 120mA Maximum Output Current Current Limit Ground Pin Current MAX UNITS 2.5 TYP 6.5 V -1.4 1.4 -3 2 150 ILIM IQ Dropout Voltage (Note 2) 160 85 IOUT = 150mA 100 IOUT = 1mA 1.1 IOUT = 50mA 55 IOUT = 150mA 165 ∆VLNR VIN = (VOUT + 0.1V) to 6.5V, IOUT = 1mA Load Regulation ∆VLDR IOUT = 0mA to 120mA, COUT = 1µF en f = 10Hz to 100kHz, CBP = 0.01µF VIH VIN = 2.5V to 5.5V VIL VIN = 2.5V to 5.5V -0.15 % mA 390 No load Line Regulation Output Voltage Noise MIN mA 180 µA 120 mV 0 0.15 %/V 0.01 0.04 %/mA COUT = 10µF 30 COUT = 100µF 20 µVRMS SHUTDOWN SHDN Input Threshold SHDN Input Bias Current ISHDN Shutdown Supply Current IQ, SHDN VSHDN = VIN VOUT = 0V Shutdown Exit Delay (Note 3) CBP = 0.1µF, COUT = 1µF, no load Shutdown Discharge Resistance MAX8868 only 2 2.0 0.4 TA = +25°C 0.01 TA = +85°C 0.5 TA = +25°C 0.01 TA = +85°C 0.2 TA = +25°C 30 TA = -40°C to +85°C 100 1 150 300 300 _______________________________________________________________________________________ V nA µA µs Ω Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 (VIN = VOUT(NOMINAL) + 0.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS THERMAL PROTECTION Thermal Shutdown Temperature TSHDN 155 °C Thermal Shutdown Hysteresis ∆TSHDN 15 °C Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) Methods. Note 2: The dropout voltage 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 95% of final value. __________________________________________Typical Operating Characteristics (VIN = VOUT(NOMINAL) + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) 2.50 2.45 5.1 5.0 4.9 110 105 GROUND PIN CURRENT (µA) 2.55 MAX8867/8-02 MAX8867/8-01 5.2 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 2.60 GROUND PIN CURRENT vs. LOAD CURRENT MAX886_EUK50 OUTPUT VOLTAGE vs. LOAD CURRENT MAX8867/8-03 MAX886_EUK25 OUTPUT VOLTAGE vs. LOAD CURRENT MAX886_EUK50 100 95 MAX886_EUK25 90 85 80 75 70 65 50 100 150 0 50 100 MAX886_EUK25 GROUND PIN CURRENT vs. INPUT VOLTAGE MAX886_EUK50 GROUND PIN CURRENT vs. INPUT VOLTAGE 40 80 NO LOAD 60 40 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 MAX886_EUK50 4 3 2 MAX886_EUK25 0 0 0 5 1 20 20 150 OUTPUT VOLTAGE vs. INPUT VOLTAGE OUTPUT VOLTAGE (V) NO LOAD 100 6 MAX8867/8-05 ILOAD = 50mA 100 GROUND PIN CURRENT (µA) 80 60 120 MAX8867/8-04 ILOAD = 50mA 50 LOAD CURRENT (mA) LOAD CURRENT (mA) 100 0 150 LOAD CURRENT (mA) 120 GROUND PIN CURRENT (µA) 60 4.8 0 MAX8867/8-06 2.40 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 0 1 2 3 4 5 6 INPUT VOLTAGE (V) _______________________________________________________________________________________ 3 MAX8867/MAX8868 ELECTRICAL CHARACTERISTICS (continued) ____________________________Typical Operating Characteristics (continued) (VIN = VOUT(NOMINAL) + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) 2.50 2.45 5.10 5.00 4.90 200 ILOAD = 50mA 180 GROUND PIN CURRENT (µA) ILOAD = 50mA OUTPUT VOLTAGE (V) 2.55 GROUND PIN CURRENT vs. TEMPERATURE MAX8867/8-08 ILOAD = 50mA OUTPUT VOLTAGE (V) 5.20 MAX8867/8-07 2.60 MAX886_EUK50 OUTPUT VOLTAGE vs. TEMPERATURE MAX8867/8-09 MAX886_EUK25 OUTPUT VOLTAGE vs. TEMPERATURE 160 140 MAX886_EUK50 120 100 80 MAX886_EUK25 60 40 20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 -40 100 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) MAX886_EUK25 DROPOUT VOLTAGE vs. LOAD CURRENT MAX886_EUK50 DROPOUT VOLTAGE vs. LOAD CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY DROPOUT VOLTAGE (mV) TA = +85°C 150 TA = +25°C 100 TA = +85°C TA = -40°C 150 60 COUT = 10µF 50 TA = +25°C PSRR (dB) 200 100 TA = -40°C COUT = 1µF 40 30 20 50 ILOAD = 50mA CBP = 0.1µF 10 0 0 40 60 80 100 120 140 160 0 0 20 LOAD CURRENT (mA) 60 80 100 120 140 160 80 MAX8867/8-13 1 COUT = 1µF COUT = 10µF ILOAD = 10mA f = 10Hz TO 100kHz 70 OUTPUT NOISE (µVRMS) CBP = 0.01µF ILOAD = 10mA 50 MAX886_EUK50 40 MAX886_EUK30 20 MAX886_EUK25 COUT = 10µF 0 1 10 FREQUENCY (kHz) 100 1000 10 100 60 50 MAX886_EUK50 40 MAX886_EUK30 30 20 MAX886_EUK25 0 0.001 0.01 BP CAPACITANCE (µF) 1000 COUT = 10µF CBP = 0.01µF f = 10Hz TO 100kHz 10 10 0.01 1 OUTPUT NOISE vs. LOAD CURRENT 60 30 0.1 FREQUENCY (kHz) OUTPUT NOISE vs. BP CAPACITANCE 10 0.1 0.01 LOAD CURRENT (mA) OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY 0.1 40 OUTPUT NOISE (µVRMS) 20 MAX8867/8-14 0 100 70 MAX8867/8-11 MAX8867/8-10 200 50 4 -20 TEMPERATURE (°C) MAX8867/8-12 -20 250 DROPOUT VOLTAGE (mV) 0 4.80 -40 0.1 1 10 LOAD CURRENT (mA) _______________________________________________________________________________________ 100 MAX8867/8-15 2.40 OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz) MAX8867/MAX8868 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 LOAD-TRANSIENT RESPONSE NEAR DROPOUT LOAD-TRANSIENT RESPONSE MAX8867/8-19 LINE-TRANSIENT RESPONSE MAX8867/8-18 MAX8867/8-20 3.01V 4V 3.01V 3.00V VIN 3.00V VOUT 2.99V 3V VOUT 2.99V 3.001V VOUT 50mA ILOAD 50mA 0mA 2.999V ILOAD 0mA 10µs/div MAX886_EUK30, VIN = VOUT + 0.5V, CIN = 10µF, ILOAD = 0mA TO 50mA MAX8868 ENTERING SHUTDOWN MAX886_EUK50 SHUTDOWN EXIT DELAY MAX886_EUK25 SHUTDOWN EXIT DELAY MAX8867/8-25 2V 100µs/div MAX886_EUK30, ILOAD = 50mA 10µs/div MAX886_EUK30, VIN = VOUT + 0.1V, CIN = 10µF, ILOAD = 0mA TO 50mA MAX8867-23 MAX8867-21 VSHDN VSHDN 2V CBP = 0.01µF 0V 0V 0V 4V VOUT CBP = 0.1µF 1V VOUT CBP = 0.1µF 2V 0V 0V 500µs/div NO LOAD CBP = 0.01µF 0V 2V VOUT VSHDN 2V 5µs/div 5µs/div ILOAD = 50mA ILOAD = 50mA MAX886_EUK25 10Hz TO 100kHz OUTPUT NOISE REGION OF STABLE COUT ESR vs. LOAD CURRENT MAX8867/8-17 MAX8867/8-16 100 COUT ESR (Ω) 10 VOUT 50µV/div COUT = 10µF COUT = 1µF 1 STABLE REGION 0.1 0.01 1ms/div COUT = 10µF, CBP = 0.1µF, ILOAD = 10mA 0 20 40 60 80 100 120 140 LOAD CURRENT (mA) _______________________________________________________________________________________ 5 MAX8867/MAX8868 ____________________________Typical Operating Characteristics (continued) (VIN = VOUT(NOMINAL) + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 0.01µF, TA = +25°C, unless otherwise noted.) MAX8867/MAX8868 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 ______________________________________________________________Pin Description PIN NAME 1 SHDN Active-Low Shutdown Input. A logic low reduces the supply current to 10nA. On the MAX8868, a logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation. 2 GND Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to maximize power dissipation. 3 IN Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND (see Capacitor Selection and Regulator Stability section). 4 OUT 5 BP IN SHDN FUNCTION Regulator Output. Sources up to 150mA. Bypass with a 1µF (<0.2Ω typical ESR) capacitor to GND. Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic capacitor for reduced noise at the output. REVERSE BATTERY PROTECTION MAX8867 MAX8868 ERROR AMP SHUTDOWN AND POWER-ON CONTROL MOS DRIVER WITH ILIMIT P N OUT * THERMAL SENSOR 1.25V REF GND BP * AUTO-DISCHARGE, MAX8868 ONLY Figure 1. Functional Diagram _______________Detailed Description The MAX8867/MAX8868 are low-noise, low-dropout, low-quiescent-current linear regulators designed primarily for battery-powered applications. The parts are available with preset output voltages varying from 2.5V to 5.0V in 100mV increments. These devices can supply loads up to 150mA. As illustrated in Figure 1, the MAX8867/MAX8868 consist of a 1.25V reference, error amplifier, P-channel pass transistor, and internal feedback voltage divider. 6 The 1.25V 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 lower, which 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 up, 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. _______________________________________________________________________________________ Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 Output Voltage The MAX8867/MAX8868 are supplied with factory-set output voltages from 2.5V to 5V, in 100mV increments. Except for the MAX886_EUK29 and the MAX886_EUK32 (which have an output voltage preset at 2.84V and 3.15V, respectively), the two-digit suffix allows the customer to choose the output voltage in 100mV increments. For example, the MAX8867EUK33 has a preset output voltage of 3.3V. (see Expanded Ordering Information). Internal P-Channel Pass Transistor The MAX8867/MAX8868 feature a 1.1Ω typical P-channel MOSFET pass transistor. This provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The MAX8867/MAX8868 do not suffer from these problems and consume only 100µA of quiescent current whether in dropout, light-load, or heavy-load applications (see the Typical Operating Characteristics). Current Limit The MAX8867/MAX8868 include a current limiter, which monitors and controls the pass transistor’s gate voltage, limiting the output current to 390mA. For design purposes, consider the current limit to be 160mA minimum to 500mA maximum. The output can be shorted to ground for an indefinite amount of time without damaging the part. Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX8867/MAX8868. When the junction temperature exceeds TJ = +170°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC’s junction temperature cools by 20°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8867/MAX8868 in the event of fault conditions. For continual operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C. Operating Region and Power Dissipation The MAX8867/MAX8868’s maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN VOUT). The maximum power dissipation is: PMAX = (TJ - TA) / (θJB + θBA) where TJ - TA is the temperature difference between the MAX8867/MAX8868 die junction and the surrounding air, θJB (or θJC) is the thermal resistance of the package, and θBA is the thermal resistance through the printed circuit board, copper traces, and other materials to the surrounding air. The GND pin of the MAX8867/MAX8868 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. Reverse Battery Protection The MAX8867/MAX8868 have a unique protection scheme that limits the reverse supply current to 1mA when either VIN or V SHDN falls below ground. Their circuitry monitors the polarity of these two pins and disconnects the internal circuitry and parasitic diodes when the battery is reversed. This feature prevents device damage. Noise Reduction An external 0.01µF bypass capacitor at BP, in conjunction with an internal 200kΩ resistor, creates a 80Hz lowpass filter for noise reduction. The MAX8867/MAX8868 exhibit 30µVRMS of output voltage noise with CBP = 0.01µF and C OUT = 10µF. Start-up time is minimized by a power-on circuit that pre-charges the bypass capacitor. The Typical Operating Characteristics show graphs of Noise vs. BP Capacitance, Noise vs. Load Current, and Output Noise Spectral Density. __________Applications Information Capacitor Selection and Regulator Stability Normally, use a 1µF capacitor on the MAX8867/ MAX8868’s input and a 1µF to 10µF capacitor on the output. Larger input capacitor values and lower ESRs provide better supply-noise rejection and line-transient response. Reduce noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range and with load currents up to 150mA, a minimum of 1µF is recommended. Note that some ceramic dielectrics exhibit large capacitance and _______________________________________________________________________________________ 7 MAX8867/MAX8868 An external bypass capacitor connected to the BP pin reduces noise at the output. Additional blocks include a current limiter, reverse battery protection, thermal sensor, and shutdown logic. The MAX8868 also includes an auto-discharge function, which actively discharges the output voltage to ground when the device is placed in shutdown mode. ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use 2.2µF or more to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1µF should be sufficient at all operating temperatures. Also, for high-ESR tantalum capacitors, 2.2µF or more may be needed to maintain ESR in the stable region. 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 for low output voltage noise. Increasing the capacitance will slightly decrease the output noise, but increase the start-up time. Values above 0.1µF provide no performance advantage and are not recommended (see Shutdown Exit Delay graph in the Typical Operating Characteristics). PSRR and Operation from Sources Other than Batteries The MAX8867/MAX8868 are designed to deliver low dropout voltages and low quiescent currents in batterypowered systems. Power-supply rejection is 63dB at low frequencies and rolls off above 10kHz. See the Power-Supply Rejection Ratio 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 MAX8867/MAX8868’s line- and load-transient responses. Load-Transient Considerations The MAX8867/MAX8868 load-transient response graphs (see Typical Operating Characteristics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient for a step change in the load current from 0mA to 50mA is 12mV. Increasing the output capacitor’s value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the MAX8867/MAX8868 use a P-channel MOSFET pass transistor, their dropout voltage is a function of drain-tosource on-resistance (RDS(ON)) multiplied by the load current (see Typical Operating Characteristics). ___________________Chip Information TRANSISTOR COUNT: 247 SUBSTRATE CONNECTED TO GND ________________________________________________________Package Information SOTPO3L.EPS MAX8867/MAX8868 Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.