MAX8865/MAX8866 MAX8877/MAX8878 LP2980 MAX8873TEUK-T MAX8873REUK-T - Datasheet Archive

 

Low-Dropout, 120mA Linear Regulators For dual versions, refer to the MAX8865/MAX8866 data sheet. For low-noise versions with

 

19-1257; Rev 1; 3/98 Low-Dropout, 120mA Linear Regulators For dual versions, refer to the MAX8865/MAX8866 MAX8865/MAX8866 data sheet. For low-noise versions with 30µVRMS output noise, refer to the MAX8877/MAX8878 MAX8877/MAX8878. _Applications Cordless Telephones _Features o LP2980 LP2980 Pin-Compatible SOT23 Package o Low, 55mV Dropout Voltage at 50mA IOUT (130mV at 120mA) o Low, 73µA No-Load Supply Current Low, 82µA Operating Supply Current (even in dropout) o Miniature External Components o Thermal Overload Protection o Output Current Limit o Reverse Battery Protection o Dual Mode Operation: Fixed or Adjustable (1.25V to 6.5V) Output o Low-Power Shutdown _Ordering Information TEMP. RANGE PINPACKAGE SOT TOP MARK MAX8873TEUK-T MAX8873TEUK-T -40°C to +85°C 5 SOT23-5 ABZH -40°C to +85°C 5 SOT23-5 ABZI MAX8873REUK-T MAX8873REUK-T -40°C to +85°C 5 SOT23-5 ABZL PART MAX8873SEUK-T MAX8873SEUK-T Modems PCS Telephones Hand-Held Instruments MAX8874TEUK-T MAX8874TEUK-T -40°C to +85°C 5 SOT23-5 ABZJ Cellular Telephones Palmtop Computers MAX8874SEUK-T MAX8874SEUK-T -40°C to +85°C 5 SOT23-5 ABZK PCMCIA Cards Electronic Planners MAX8874REUK-T MAX8874REUK-T -40°C to +85°C 5 SOT23-5 ABZM _Typical Operating Circuit _Pin Configuration TOP VIEW IN 1 OUT IN BATTERY CIN 1µF MAX8873 MAX8873 MAX8874 MAX8874 SHDN GND 5 OUT OUTPUT VOLTAGE COUT 1µF SET GND 2 MAX8873 MAX8873 MAX8874 MAX8874 SHDN 3 4 SET SOT23-5 Dual Mode is a trademark of Maxim Integrated Products. _ 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. MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R _General Description The MAX8873T/S/R MAX8873T/S/R and MAX8874T/S/R MAX8874T/S/R low-dropout linear regulators operate from a +2.5V to +6.5V input range and deliver up to 120mA. A PMOS pass transistor allows the low, 82µA supply current to remain independent of load, making these devices ideal for battery-operated portable equipment such as cellular phones and cordless phones. The devices feature Dual ModeTM operation: their output voltage is preset (at 3.15V for the T versions, 2.84V for the S versions, or 2.80V for the R versions) or can be adjusted with an external resistor divider. Total error on the output is ±3.5%. Output voltages are set on the low side of popular ranges so that power drain is minimized for longer battery life. Other features include low-power shutdown, short-circuit protection, thermal shutdown protection, and reverse battery protection. The MAX8874 MAX8874 also includes an auto-discharge function, which actively discharges the output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 5-pin SOT23 package. MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R Low-Dropout, 120mA Linear Regulators ABSOLUTE MAXIMUM RATINGS VIN to GND .-7V to +7V Output Short-Circuit Duration .Infinite SET to GND .-0.3V to +7V SHDN to GND.-7V to +7V SHDN to IN .-7V to 0.3V OUT 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 JA .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 = +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage (Note 2) SYMBOL CONDITIONS MIN VIN TYP MAX UNITS 6.5 2.5 V Adjustable Output Voltage Range (Note 3) VOUT 0mA IOUT 50mA, SET = GND 3.05 3.15 3.25 MAX887 MAX887_S 2.75 2.84 2.93 MAX887 MAX887_R Output Voltage MAX887 MAX887_T 2.70 2.80 2.88 VOUT VSET Maximum Output Current Current Limit (Note 4) Ground Pin Current 6.5 120 ILIM IQ IOUT = 0mA 73 IOUT = 50mA mA 82 150 IOUT = 1mA 1.1 IOUT = 50mA Dropout Voltage (Note 5) 55 120 0 0.15 SET = GND 0.011 0.030 SET tied to OUT 0.006 Line Regulation VLNR VIN = 2.5V to 6.5V, SET tied to OUT, IOUT = 1mA Load Regulation VLDR IOUT = 0mA to 50mA Output Voltage Noise 10Hz to 1MHz -0.15 V mA 280 SET = GND V COUT = 1µF 350 COUT = 100µF 220 µA mV %/V %/mA µVRMS SHUTDOWN SHDN Input Threshold VIH SHDN Input Bias Current ISHDN Shutdown Supply Current IQSHDN Shutdown Discharge Resistance (MAX8874 MAX8874) 2 2.0 VIL 0.4 V SHDN = VIN VOUT = 0V TA = +25°C 0 TA = TMAX 0.05 TA = +25°C 0.0001 TA = TMAX 0.02 300 _ 100 1 V nA µA Low-Dropout, 120mA Linear Regulators (VIN = +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX TA = +25°C 1.225 1.25 1.275 TA = TMIN to TMAX 1.215 1.25 1.285 TA = +25°C 0.015 2.5 TA = TMAX UNITS 0.5 SET INPUT SET Reference Voltage (Note 3) VSET VIN = 2.5V to 6.5V, IOUT = 1mA SET Input Leakage Current (Note 3) ISET VSET = 1.3V V nA THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis TSHDN 170 °C TSHDN 20 °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: Guaranteed by line-regulation test. Note 3: Adjustable mode only. Note 4: For design purposes, the current limit should be considered 120mA minimum to 420mA maximum. Note 5: The dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT + 2V. _Typical Operating Characteristics (VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX887 MAX887_T, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. LOAD CURRENT 3.5 MAX8873/74-02 MAX8873/74-02 3.25 95 3.0 3.20 3.15 3.10 OUTPUT VOLTAGE (V) 90 SUPPLY CURRENT (µA) OUTPUT VOLTAGE (V) 100 MAX8873/74-01 MAX8873/74-01 3.30 OUTPUT VOLTAGE vs. INPUT VOLTAGE MAX8873/74-03 MAX8873/74-03 OUTPUT VOLTAGE vs. LOAD CURRENT 85 80 75 70 65 60 3.05 50 0 20 40 60 80 LOAD CURRENT (mA) 100 120 2.0 NO LOAD 1.5 1.0 0.5 55 3.00 2.5 0 0 20 40 60 80 LOAD CURRENT (mA) 100 120 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) _ 3 MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R ELECTRICAL CHARACTERISTICS (continued) _Typical Operating Characteristics (continued) (VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX887 MAX887_T, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. TEMPERATURE 70 ILOAD = 0mA 60 50 40 30 20 100 MAX8863/4-06 MAX8863/4-06 3.25 OUTPUT VOLTAGE (V) ILOAD = 50mA 90 80 3.20 3.15 3.10 70 60 50 40 30 20 3.05 10 10 3.00 0 3 2 4 6 5 0 -40 7 -20 DROPOUT VOLTAGE vs. LOAD CURRENT 70 MAX8873/74-07 MAX8873/74-07 TA = +85°C 80 60 100 PSRR (dB) 80 TA = -40°C COUT = 10µF 40 30 COUT = 1µF 20 40 10 20 0 0 20 40 60 80 100 0 0.1 1 10 FREQUENCY (kHz) 100 100 COUT = 1µF COUT = 100µF 0.10 1000 0.1 1 10 OUTPUT NOISE DC TO 1MHz VOUT STABLE REGION 0.1 0.01 0 20 40 60 80 LOAD CURRENT (mA) 4 100 100 1 EXTERNAL FEEDBACK 1 80 RL = 50 INTERNAL FEEDBACK 10 60 10 MAX8873/74-8B MAX8873/74-8B COUT = 1µF 40 FREQUENCY (kHz) REGION OF STABLE COUT ESR vs. LOAD CURRENT 1000 20 0.01 0.01 120 LOAD CURRENT (mA) COUT ESR () -20 OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY 50 TA = +25°C 0 -40 TEMPERATURE (°C) VOUT = 3.15V RL = 100 60 120 60 40 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 160 100 20 TEMPERATURE (°C) INPUT VOLTAGE (V) 140 0 OUTPUT SPECTRAL NOISE DENSITY (µV/Hz) 1 MAX8873/74-08 MAX8873/74-08 0 MAX8873/74-8A MAX8873/74-8A SUPPLY CURRENT (µA) 80 ILOAD = 50mA SUPPLY CURRENT (µA) ILOAD = 50mA 90 3.30 MAX8873/74-04 MAX8873/74-04 100 SUPPLY CURRENT vs. TEMPERATURE MAX8873/74-05 MAX8873/74-05 SUPPLY CURRENT vs. INPUT VOLTAGE DROPOUT VOLTAGE (mV) MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R Low-Dropout, 120mA Linear Regulators 120 1ms/div ILOAD = 50mA, VOUT IS AC COUPLED _ 100 1000 Low-Dropout, 120mA Linear Regulators (VIN = +3.6V, CIN = 1µF, COUT = 1µF, MAX887 MAX887_T, TA = +25°C, unless otherwise noted.) LINE-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE 3.16V 3.16V VOUT 3.15V VOUT 3.15V 3.14V 3.14V VIN 50mA 4.6V ILOAD 0mA 3.6V 50µs/div ILOAD = 50mA, VOUT IS AC COUPLED 10µs/div ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED LOAD-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE 3.16V 3.16V VOUT 3.15V VOUT 3.15V 3.14V 3.14V 50mA ILOAD 0mA 50mA ILOAD 0mA 10µs/div 10µs/div VIN = VOUT + 0.2V, ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED VIN = VOUT + 0.1V, ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED MAX8874 MAX8874 SHUTDOWN (NO LOAD) MAX8874 MAX8874 SHUTDOWN 4V VOUT 4V 2V VOUT 0V VSHDN 2V 0V 2V VSHDN 0V 2V 0V 500µs/div NO LOAD 200µs/div ILOAD = 50mA _ 5 MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R _Typical Operating Characteristics (continued) MAX8873T/S/R MAX8873T/S/R, MAX8874T/S/R MAX8874T/S/R Low-Dropout, 120mA Linear Regulators _Pin Description PIN NAME FUNCTION 1 IN 2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. 3 SHDN Active-Low Shutdown Input. A logic low reduces the supply current to 0.1nA. On the MAX8874 MAX8874, a logic low also causes the output voltage to discharge to GND. Connect to IN for normal operation. 4 SET Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset 2.80V (MAX887 MAX887_R), 2.84V (MAX887 MAX887_S), or 3.15V (MAX887 MAX887_T). Connect to an external resistor divider for adjustable-output operation. DO NOT LEAVE THIS PIN UNCONNECTED. 5 OUT Regulator Output. Fixed or adjustable from 1.25V to 6.5V. Sources up to 120mA. Bypass with a 1µF, 5.5V Minimum Load Current When operating the MAX8873/MAX8874 MAX8873/MAX8874 with an input voltage above 5.5V, a minimum load current of 20µA is required to maintain regulation in preset voltage mode. When setting the output with external resistors, the minimum current through the external feedback resistors and load must be 30µA. _Applications Information Capacitor Selection and Regulator Stability Normally, use a 1µF capacitor on the input and a 1µF capacitor on the output of the MAX8873/MAX8874 MAX8873/MAX8874. Larger input capacitor values and lower ESR provide better supply-noise rejection and transient response. A higher-value input capacitor (10µF) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. Improve load-transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range, with load currents up to 120mA, a minimum of 1µF is recommended. Power-Supply Rejection and Operation from Sources Other than Batteries The MAX8873/MAX8874 MAX8873/MAX8874 are designed to deliver low dropout voltages and low quiescent currents in batterypowered systems. Power-supply rejection is 62dB at low frequencies and rolls off above 300Hz. As the frequency increases above 20kHz, the output capacitor is the major contributor to the rejection of power-supply noise (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics). When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output capacitors, and by using passive filtering techniques (see the supply and load-transient responses in the Typical Operating Characteristics). Load-Transient Considerations The MAX8873/MAX8874 MAX8873/MAX8874 load-transient response graphs (see Typical Operating Characteristics) show two components of the output response: a DC shift of the output voltage due to the different load currents and the transient response. Typical overshoot for step changes in the load current from 0mA to 50mA is 14mV. Increasing the output capacitor's value and decreasing its ESR attenuates transient spikes. 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 MAX8873/MAX8874 MAX8873/MAX8874 use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current (see Electrical Characteristics). _Chip Information TRANSISTOR COUNT: 148 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.