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MAX883ESA-T

MAX883ESA-T

  • 厂商:

    MAXIM(美信)

  • 封装:

    SOIC8_150MIL

  • 描述:

    IC REG LIN POS ADJ 200MA 8SOIC

  • 数据手册
  • 价格&库存
MAX883ESA-T 数据手册
19-0275; Rev 4; 7/09 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators Applications Pagers and Cellular Phones 3.3V and 5V Regulators 1.25V to 11V Adjustable Regulators High-Efficiency Linear Regulators Battery-Powered Devices Portable Instruments Solar-Powered Instruments Features o Foldback Current Limiting o High-Power (1.5W) 8-Pin SO Package o Dual Mode Operation: Fixed or Adjustable Output from 1.25V to 11V o Large Input Range (2.7V to 11.5V) o Internal 1.1Ω p-Channel Pass Transistor Draws No Base Current o Low 220mV Dropout Voltage at 200mA Output Current o 11µA (typ) Quiescent Current o 1µA (max) Shutdown Mode or 7µA (typ) Standby Mode o Low-Battery Detection Comparator o Reverse-Current Protection o Thermal-Overload Protection Ordering Information PART TEMP RANGE 0°C to +70°C MAX882CPA PINPACKAGE 8 PDIP MAX882CSA 0°C to +70°C 8 SO MAX882C/D 0°C to +70°C Dice* MAX882EPA -40°C to +85°C 8 PDIP MAX882ESA -40°C to +85°C 8 SO Ordering Information continued at end of data sheet. *Dice are tested at TJ = +25°C, DC parameters only. **Contact factory for availability. Typical Operating Circuit ON/OFF OFF (STBY) Pin Configuration TOP VIEW ( ) ARE FOR MAX882. LBO 1 SET 2 GND 3 OUT 4 8 LBI MAX882 MAX883 MAX884 INPUT VOLTAGE 5 LBI CIN O.1μF 7 OFF (STBY) 6 GND IN BATTERY SET MAX882 MAX883 MAX884 GND OUT OUTPUT VOLTAGE COUT 2.2μF IN DIP/SO ( ) ARE FOR MAX882. Dual Mode is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX882/MAX883/MAX884 General Description The MAX882/MAX883/MAX884 linear regulators maximize battery life by combining ultra-low supply currents and low dropout voltages. They feature 200mA output current capability at up to +125°C junction temperature and come in a 1.5W SOIC package. The 1.5W package (compared to 0.47W for standard SOIC packages) allows a wider operating range for the input voltage and output current. The MAX882/MAX883/MAX884 use a pchannel MOSFET pass transistor to maintain a low 11µA (15µA max) supply current from no-load to the full 200mA output. Unlike earlier bipolar regulators, there are no PNP base current losses that increase with output current. In dropout, the MOSFET does not suffer from excessive base currents that occur when PNP transistors go into saturation. Typical dropout voltages are 220mV at 5V and 200mA, or 320mV at 3.3V and 200mA. The MAX882 features a 7µA standby mode that disables the output but keeps the reference, low-battery comparator, and biasing circuitry alive. The MAX883/MAX884 feature a shutdown (OFF) mode that turns off all circuitry, reducing supply current to less than 1µA. All three devices include a low-battery-detection comparator, foldback current limiting, reverse-current protection, and thermal-overload protection. The output is preset at 3.3V for the MAX882/MAX884 and 5V for the MAX883. In addition, all devices employ Dual Mode™ operation, allowing user-adjustable outputs from 1.25V to 11V using external resistors. The input voltage supply range is 2.7V to 11.5V. For low-dropout linear regulators with output currents up to 500mA, refer to the MAX603/MAX604 data sheet. MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators ABSOLUTE MAXIMUM RATINGS High-Power SO (derate 18.75mW/°C above +70°C) .......1.5W CERDIP (derate 8.00mW/°C above +70°C) .................640mW Operating Temperature Ranges MAX88_C_A ........................................................0°C to +70°C MAX88_E_A .....................................................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C Supply Voltage (IN or OUT to GND).......................-0.3V to +12V Output Short-Circuit Duration ...............................................1min Continuous Output Current ...............................................300mA LBO Output Current ............................................................50mA LBO Output Voltage and LBI, SET, STBY, OFF Input Voltages ............-0.3V to the greater of (IN + 0.3V) or (OUT + 0.3V) Continuous Power Dissipation (TJ = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW 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 = 6V (MAX883) or VIN = 4.3V (MAX882/MAX884), COUT = 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TJ = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX88_C_A Input Voltage Range VIN SET = OUT, RL = 1kΩ MAX883, 6.0V ≤ VIN ≤ 11.5V Output Voltage (Note 2) VOUT MAX882/MAX884, 4.3V ≤ VIN ≤ 11.5V Load Regulation Line Regulation ∆VLDR ∆VLNR IOUT = 1mA to 200mA IOUT = 1mA to 150mA ∆VDO MAX882/MAX884 SET = OUT, VIN = 6V Quiescent Current IQ VIN = 11.5V 2 TYP 2.7 MAX MAX88_E_A 2.9 11.5 3.0 11.5 IOUT = 100µA - 250mA, 0°C ≤ TJ ≤ +85°C 4.75 IOUT = 100µA - 250mA, -40°C ≤ TJ ≤ +85°C 4.65 IOUT = 100µA - 200mA, 0°C ≤ TJ ≤ +85°C 3.15 IOUT = 100µA - 200mA, -40°C ≤ TJ ≤ +85°C 3.07 MAX883C_A/E_A 5.00 5.25 V 3.30 3.45 3.53 60 100 150 30 10 40 110 220 IOUT = 200mA 220 440 IOUT = 100mA 160 320 IOUT = 200mA 320 640 MAX88_C_A/E_A 11 15 MAX88_MJA 30 15 MAX88_MJA _______________________________________________________________________________________ mV 100 IOUT = 100mA MAX88_C_A/E_A V 5.35 MAX883MJA MAX882, MAX884 UNITS 11.5 MAX88_MJA (VOUT + 0.5V) < VIN < 11.5V, IOUT = 10mA MAX883 Dropout Voltage (Note 3) MIN 25 40 mV mV µA 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators (VIN = 6V (MAX883) or VIN = 4.3V (MAX882/MAX884), COUT = 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TJ = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS STBY = 0, VIN = 6V, SET = OUT STBY Quiescent Current (Note 4) OFF Quiescent Current IQ STBY IQ OFF STBY = 0, VIN = 11.5V, SET = OUT MIN MAX882C_A/E_A TYP MAX 7 15 MAX882MJA 30 MAX882C_A/E_A 10 MAX882MJA IOUT(MIN) OFF = 0, RL = 1kΩ, MAX88_C_A VIN = 11.5V MAX88_E_A MAX883/MAX884 MAX88_MJA Foldback Current Limit (Note 5) ILIM Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis Reverse-Current-Protection (Note 6) VIN = 11.5V, SET = OUT 0.01 5 3 MAX88_MJA 10 VOUT < 0.8V 170 VOUT > 0.8V and VIN - VOUT > 0.7V 430 10 6 20 VOUT = 3.0V MAX882_A, MAX884_A 6 20 MAX883/MAX884: VIN = 0, OFF = 0, VOUT = 3.0V 0.01 Startup Overshoot VOSH RL = 1kΩ, COUT = 2.2µF VSET TH 200 For internal feedback 65 For external feedback VSET SET = OUT, RL = 1kΩ SET Input Leakage Current ISET VSET = 1.5V or 0 VLBI LBI Hysteresis ∆VLBI LBI Input Leakage Current LBO Output Low Voltage ILBI VLBOL LBI signal falling 150 65 0°C ≤ TJ ≤ +85°C 1.16 1.20 -40°C ≤ TJ ≤ +85°C 1.12 0°C ≤ TJ ≤ +85°C 1.15 -40°C ≤ TJ ≤ +85°C 1.11 µA µs 30 1.24 1.28 ±0.01 ±50 1.20 1.25 1.29 7 VLBI = 1.5V ILBO sink = 1.2mA, VLBI = 1V, 3V < VIN < 11.5V, SET = OUT LBO Output Leakage Current IBLO LKG VLBI = VIN, VLBO = VIN OUT Leakage Current IOUT LKG VIN = 11.5V, VOUT = 2V, SET = OUT MAX88_C_A mV % of VOUT VIN = 9V, RL = 33Ω, OFF from 0 to VIN, 0% to 95% of VOUT SET Reference Voltage LBI Threshold Voltage °C MAX883_A 7 Dual Mode SET Threshold °C VOUT = 4.5V MAX882: VIN = 0, STBY = 0, VOUT = 3.0V µA mA +160 IRVL TSTART µA 1 MAX88_E_A Reverse Leakage Current Time Required to Exit OFF or STBY Modes 1 10 ∆TSD ∆VRTH µA 40 MAX88_C_A Minimum Load Current 25 UNITS mV V nA V mV ±0.01 ±50 nA 90 250 mV 0.01 0.1 µA 0.01 1 MAX88_E_A 3 MAX88_MJA 10 µA _______________________________________________________________________________________ 3 MAX882/MAX883/MAX884 ELECTRICAL CHARACTERISTICS (continued) MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators ELECTRICAL CHARACTERISTICS (continued) (VIN = 6V (MAX883) or VIN = 4.3V (MAX882/MAX884), COUT = 2.2µF, STBY or OFF = VIN, SET = GND, LBI = VIN, TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TJ = +25°C.) (Note 1) PARAMETER STBY Threshold Voltage STBY Hysteresis STBY Input Leakage Current SYMBOL V STBY ∆V STBY ISTBY VIL OFF OFF Threshold Voltage OFF Input Leakage Current Output Noise VIH OFF IOFF en CONDITIONS STBY signal falling, MAX882_A MIN TYP MAX 1.15 1.20 1.25 MAX882_A 7 V STBY = VIN or 0, MAX882_A ±0.01 In off mode, MAX883_A, MAX884_A 2.0 In on mode, SET = OUT, 6V < VIN < 11.5V, MAX883_A, MAX884_A 3.0 V OFF = VIN or 0 V mV ±50 nA 0.4 In on mode, SET = OUT, VIN < 6V, MAX883_A, MAX884_A 10Hz to 10kHz, SET = OUT, RL = 1kΩ, COUT = 2.2µF (Note 7) UNITS V ±0.01 250 ±50 nA µVRMS Note 1: Electrical specifications are measured by pulse testing and are guaranteed for a junction temperature (TJ) within the operating temperature range, unless otherwise noted. Specifications to -40°C are guaranteed by design and not production tested. Note 2: (VIN - VOUT) is limited to keep the product (IOUT x (VIN - VOUT)) from exceeding the package power dissipation limits. See Figure 5. Therefore, the combination of high output current and high supply voltage is not tested. Note 3: Dropout Voltage is (VIN - VOUT) when VOUT falls to 100mV below its nominal value at VIN = (VOUT + 2V). For example, the MAX883 is tested by measuring the VOUT at VIN = 7V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN - VOUT) is then measured and defined as ∆VDO. Note 4: Since standby mode inhibits the output but keeps all biasing circuitry alive, the Standby Quiescent Current is similar to the normal operating quiescent current. Note 5: Foldback Current Limit was characterized by pulse testing to remain below the maximum junction temperature (not production tested). Note 6: The Reverse-Current Protection Threshold is the output/input differential voltage (VOUT - VIN) at which reverse-current protection switchover occurs and the pass transistor is turned off. See the section Reverse-Current Protection in the Detailed Description. Note 7: Noise is tested using a bandpass amplifier with two poles at 10Hz and two poles at 10kHz. 4 _______________________________________________________________________________________ 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators OUTPUT VOLTAGE vs. TEMPERATURE 25 VOUT = 5V (MAX883) VOUT = 3.3V (MAX882/MAX884) 99 20 98 15 97 10 IQ OUTPUT VOLTAGE NORMALIZED TO OUTPUT VOLTAGE AT 1mA 96 5 0.1 1 10 100 103 102 101 100 99 98 97 96 0 95 0.01 MAX882/4-04a 100 104 NORMALIZED OUTPUT VOLTAGE (%) 30 MAX882/4-01 101 QUIESCENT CURRENT (mA) NORMALIZED OUTPUT VOLTAGE (%) OUTPUT VOLTAGE AND QUIESCENT CURRENT vs. LOAD CURRENT -55 -35 -15 250 5 85 105 125 4 12 VOUT = 3.3V (MAX882/MAX884) 3 10 2 8 IQ (MAX882/MAX884) 1 QUIESCENT CURRENT (mA) 14 VOUT = 5V (MAX883) MAX882/4-04 15 QUIESCENT CURRENT (µA) 16 MAX882/4-03 6 OUTPUT VOLTAGE (V) 45 65 QUIESCENT CURRENT vs. TEMPERATURE OUTPUT VOLTAGE AND QUIESCENT CURRENT vs. SUPPLY VOLTAGE 5 25 TEMPERATURE (°C) LOAD CURRENT (mA) 12 9 6 3 6 IQ (MAX883) 0 4 2 3 4 5 6 7 8 9 0 -55 -35 -15 10 11 12 5 25 45 65 85 105 125 TEMPERATURE (°C) SUPPLY VOLTAGE (V) DROPOUT VOLTAGE vs. LOAD CURRENT MAX882/4-05 MAX882/4-06 10Hz to 10kHz OUTPUT NOISE 0.6 OUTPUT NOISE (1mV/div) DROPOUT VOLTAGE (V) 0.5 VOUT = 3.3V (MAX882/MAX884) 0.4 0.3 0.2 VOUT = 5V (MAX883) 0.1 MAX883 VOUT = 5V 0 0 50 100 150 200 250 300 10ms/div LOAD CURRENT (mA) _______________________________________________________________________________________ 5 MAX882/MAX883/MAX884 Typical Operating Characteristics (VIN = 7V for MAX883, VIN = 5.3V for MAX882/MAX884, OFF or STBY = VIN, SET = GND, LBI = VIN, LBO = OPEN, CIN = COUT = 2.2µF, RL = 1kΩ, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VIN = 7V for MAX883, VIN = 5.3V for MAX882/MAX884, OFF or STBY = VIN, SET = GND, LBI = VIN, LBO = OPEN, CIN = COUT = 2.2µF, RL = 1kΩ, TA = +25°C, unless otherwise noted.) LINE-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE A A B B 500µs/div 1ms/div MAX883: VOUT = 5V, CIN = 0µF, tR = 15µs, tF = 13µs A: VIN = 8V (HIGH) / VIN = 7V (LOW) B: OUTPUT VOLTAGE (100mV/div) MAX883: VOUT = 5V, tR = 24µs, tF = 44µs A: OUTPUT VOLTAGE (100mV/div) B: IOUT = 250mA (HIGH) / IOUT = 50mA (LOW) LBO LOW VOLTAGE vs. SINK CURRENT OVERSHOOT AND TIME EXITING SHUTDOWN MODE MAX882/4-10 5 RL = 100Ω B 5V A 4 LBO LOW VOLTAGE (V) MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators 3 MAX882/MAX884 2 MAX883 1 0V 500µs/div A: OFF PIN VOLTAGE (1V/div): RISE TIME = 9µs B: MAX883 OUTPUT VOLTAGE (1V/div): DELAY = 135µs, RISE TIME = 67µs, OVERSHOOT = 0% 6 0 0.1 1 10 SINK CURRENT (mA) _______________________________________________________________________________________ 50 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators PIN MAX882 MAX883/ MAX884 NAME DESCRIPTION 1 1 LBO Low-Battery Output is an open-drain output that goes low when LBI is less than 1.2V. Connect to IN or OUT through a pull-up resistor. LBO is undefined during shutdown mode (MAX883/MAX884). 2 2 SET Feedback for setting the output voltage. Connect to GND to set the output voltage to the preselected 3.3V or 5V. Connect to an external resistor network for adjustable-output operation. 3, 6 3, 6 GND Ground pins—also function as heatsinks in the SO package. All GND pins must be soldered to the PC board for proper power dissipation. Connect to large copper pads or planes to channel heat from the IC. 4 4 OUT Regulator Output. Fixed or adjustable from 1.25V to 11.0V. Sources up to 200mA. Bypass with a 2.2µF capacitor. 5 5 IN 7 — STBY Standby. Active-low comparator input. Connect to GND to disable the output or to IN for normal operation. A resistor network (from IN) can be used to set a standby mode threshold. — 7 OFF Shutdown. Active-low logic input. In OFF mode, supply current is reduced below 1µA and VOUT = 0. 8 8 LBI Low-Battery comparator Input. Tie to IN when not used. Regulator Input. Supply voltage can range from 2.7V to 11.5V. _______________Detailed Description The MAX882/MAX883/MAX884 are micropower, lowdropout linear regulators designed primarily for batterypowered applications. They feature Dual Mode operation, allowing a fixed output of 5V for the MAX883 and 3.3V for the MAX882/MAX884, or an adjustable output from 1.25V to 11V. These devices supply up to 200mA while requiring less than 15µA quiescent current. As illustrated in Figure 1, they consist of a 1.20V reference, error amplifier, MOSFET driver, p-channel pass transistor, dual-mode comparator, and feedback voltage-divider. The 1.20V reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the p-channel pass transistor. If the feedback voltage is lower than the reference, the pass transistor’s gate is pulled lower, allowing more current to pass and increasing 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 either an internal resistor voltage-divider connected to the OUT pin, or an external resistor network connected to the SET pin. The dual-mode comparator examines the SET pin voltage and selects the feedback path used. If the SET pin is below 65mV, internal feedback is used and the output voltage is regulated to 5V for the MAX883 or 3.3V for the MAX882/MAX884. Additional blocks include a foldback current limiter, reverse-current protection, a thermal sensor, shutdown or standby logic, and a low-battery-detection comparator. Internal p-Channel Pass Transistor The MAX882/MAX883/MAX884 feature a 200mA Pchannel 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 large amounts of current in dropout when the pass transistor saturates. They also use high basedrive currents under large loads. The MAX882/MAX883/ MAX884 do not suffer from these problems and consume only 11µA of quiescent current during light loads, heavy loads, and dropout. Output Voltage Selection The MAX882/MAX883/MAX884 feature Dual Mode operation. In preset voltage mode, the MAX883’s output is set to 5V and the MAX882/MAX884’s output is set to 3.3V, using internal trimmed feedback resistors. Select this mode by connecting SET to ground. In preset voltage mode, impedances between SET and ground should be less than 100kΩ. Otherwise, spurious conditions could cause the voltage at SET to exceed the 65mV dual-mode threshold. _______________________________________________________________________________________ 7 MAX882/MAX883/MAX884 Pin Description MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators IN LBI LOW-BATTERY COMPARATOR LBO MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT N REVERSECURRENT PROTECTION P ERROR AMP SHUTDOWN LOGIC OFF (STBY) OUT 1.20V REFERENCE SET DUAL-MODE COMPARATOR THERMAL SENSOR R1 R2 65mV GND ( ) ARE FOR MAX882. Figure 1. MAX882/MAX883/MAX884 Functional Diagram In adjustable mode, the user selects an output voltage in the 1.25V to 11V range by connecting two external resistors, used as a voltage-divider, to the SET pin (Figure 2). The output voltage is set by the following equation: ⎛ R1 ⎞ VOUT = VSET ⎜1 + ⎟ R 2⎠ ⎝ where VSET = 1.20V. To simplify resistor selection: ⎛V ⎞ R1 = R2 ⎜ OUT − 1⎟ V ⎝ SET ⎠ Since the input bias current at SET is nominally zero, large resistance values can be used for R1 and R2 to minimize power consumption without losing accuracy. Up to 1.5MΩ is acceptable for R2. Since the VSET tolerance is less than ±40mV, the output can be set using fixed resistors instead of trim pots. 8 Standby Mode (MAX882) The MAX882 has a standby feature that disconnects the input from the output when STBY is brought low, but keeps all other circuitry awake. In this mode, V OUT drops to 0, and the internal biasing circuitry (including the low-battery comparator) remains on. The maximum quiescent current during standby is 15µA. STBY is a comparator input with the other input internally tied to the reference voltage. Use a resistor network as shown in Figure 3 to set a standby-mode threshold voltage for undervoltage lockout. Connect STBY to IN for normal operation. OFF Mode (MAX883/MAX884) A low-logic input on the OFF pin shuts down the MAX883/MAX884. In this mode, the pass transistor, control circuit, reference, and all biases are turned off, and the supply current is reduced to less than 1µA. LBO is undefined in OFF mode. Connect OFF to IN for normal operation. _______________________________________________________________________________________ 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators IN OUTPUT VOLTAGE OUT R1 MAX882 OFF (STBY) MAX883 MAX884 CIN O.1µF GND IN LBI INPUT VOLTAGE LBI R1 LOAD SET R2 COUT 2.2µF CIN O.1µF R2 VSTBY TRIP = VSTBY R1 + R2 , VSET = 1.20V R2 Figure 2. Adjustable Output Using External Feedback Resistors MAX882 STBY ( ) ARE FOR MAX882. VOUT = VSET OUTPUT VOLTAGE OUT GND SET COUT 2.2µF R1+ R2 , VSTBY = 1.20V R2 Figure 3. Setting an Undervoltage Lockout Threshold Using STBY Foldback Current Limiting Power Dissipation and Operating Region The MAX882/MAX883/MAX884 also include a foldback current limiter. It monitors and controls the pass transistor’s gate voltage, estimating the output current and limiting it to 430mA for output voltages above 0.8V and (VIN - VOUT) > 0.7V. If the output voltage drops below 0.8V, implying a short-circuit condition, the output current is limited to 170mA. The output can be shorted to ground for 1min without damaging the device if the package can dissipate (VIN x 170mA) without exceeding TJ = +150°C. When the output is greater than 0.8V and (VIN - VOUT) < 0.7V (dropout operation), no current limiting is allowed, to provide maximum load drive. Maximum power dissipation of the MAX882/MAX883/ MAX884 depends on the thermal resistance of the case and PC 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 resulting power dissipation is as follows: (TJ − TA ) P= (θ JB + θ BA ) Thermal Overload Protection Thermal overload protection limits total power dissipation in the MAX882/MAX883/MAX884. When the junction temperature exceeds TJ = +160°C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC’s junction temperature cools by 10°C, resulting in a pulsed output during thermal overload conditions. Thermal overload protection is designed to protect the MAX882/MAX883/MAX884 if fault conditions occur. It is not intended to be used as an operating mode. Prolonged operation in thermal-shutdown mode may reduce the IC’s reliability. For continual operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. where (TJ - TA) is the temperature difference between the MAX882/MAX883/MAX884 die junction and the surrounding air, θJB (or θJC) is the thermal resistance of the package chosen, and θBA is the thermal resistance through the PC board, copper traces, and other materials to the surrounding air. The 8-pin small-outline package for the MAX882/ MAX883/MAX884 features a special lead frame with a lower thermal resistance and higher allowable power dissipation. This package’s thermal resistance package is θJB = 53°C/W, compared with θJB = 110°C/W for an 8-pin plastic DIP package and θJB = 125°C/W for an 8pin ceramic DIP package. _______________________________________________________________________________________ 9 MAX882/MAX883/MAX884 INPUT VOLTAGE 1.2 1.1 1.0 0.9 0.1cm2 0.0155in2 10cm2 1.55in2 MAXIMUM POWER DISSIPATION LIMIT 200 150 100 50 HIGHPOWER SOIC PLASTIC DIP CERAMIC DIP OPERATING REGION AT TA = +25°C TJ = +125°C 0 1cm2 0.155in2 MAX882/4-05a MAXIMUM CURRENT 100cm2 15.5in2 2 MAXIMUM SUPPLY VOLTAGE LIMIT 1.3 250 TYPICAL DROPOUT VOLTAGE LIMIT 1.4 MAX883, VOUT = 5V 8-PIN SO PACKAGE 77.4cm2, SINGLE-SIDED BOARD 1oz COPPER GLASS EPOXY, TJ = +125°C, TA = +25°C, STILL AIR MAXIMUM OUTPUT CURRENT (mA) 1.5 MAX882/4-fig04 1.6 POWER DISSIPATION (W) 3 4 5 6 7 8 9 10 11 12 13 SUPPLY VOLTAGE (V) COPPER GROUND PAD AREA IOUT(MAX) = MAXIMUM CURRENT MAXIMUM POWER DISSIPATION LIMIT 200 150 100 50 HIGHPOWER SOIC PLASTIC DIP CERAMIC DIP OPERATING REGION AT TA = +25°C TJ = +125°C 0 4 5 6 7 8 9 10 11 12 13 SUPPLY VOLTAGE (V) Figure 5b. Safe Operating Regions: MAX883 Maximum Output Current vs. Supply Voltage P(TJ − TA ) (VIN − VOUT )100°C where P is derived from Figure 4. 10 MAX882/4-05b 250 MAXIMUM SUPPLY VOLTAGE LIMIT The GND pins of the MAX882/MAX883/MAX884 SOIC package perform the dual function of providing an electrical connection to ground and channeling heat away. Connect all GND pins to ground using a large pad or ground plane. Where this is impossible, place a copper plane on an adjacent layer. For a given power dissipation, the pad should exceed the associated dimensions in Figure 4. Figure 4 assumes the IC is in an 8-pin small-outline package that has a maximum junction temperature of +125°C and is soldered directly to the pad; it also has a +25°C ambient air temperature and no other heat sources. Use larger pad sizes for other packages, lower junction temperatures, higher ambient temperatures, or conditions where the IC is not soldered directly to the heat-sinking ground pad. When operating C- and E-grade parts up to a TJ of +125°C, expect performance similar to M-grade specifications. For TJ between +125°C and +150°C, the output voltage may drift more. The MAX882/MAX883/MAX884 can regulate currents up to 250mA and operate with input voltages up to 11.5V, but not simultaneously. High output currents can only be sustained when input-output differential voltages are small, as shown in Figure 5. Maximum power dissipation depends on packaging, temperature, and air flow. The maximum output current is as follows: Figure 5a. Safe Operating Regions: MAX882/MAX884 Maximum Output Current vs. Supply Voltage TYPICAL DROPOUT VOLTAGE LIMIT Figure 4. Typical Maximum Power Dissipation vs. Ground Pad Area MAXIMUM OUTPUT CURRENT (mA) MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators ______________________________________________________________________________________ 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators R1 CIN R2 O.1µF GND R3 MAX882 MAX883 MAX884 SET INPUT VOLTAGE OUT IN POWERCOUT FAIL INDICATION 2.2µF R1 + R2 , VLBI = 1.20V R2 Figure 6. Using the Low-Battery Comparator to Monitor Battery Voltage Reverse-Current Protection The MAX882/MAX883/MAX884 have a unique protection scheme that limits reverse currents when the input voltage falls below the output. It monitors the voltages on IN and OUT and switches the IC’s substrate and power bus to the more positive of the two. The control circuitry is then able to remain functioning and turn the pass transistor off, limiting reverse currents back through to the input of the device. In this mode, typical current into OUT to GND is 15µA at VOUT = 3.3V and 50µA at VOUT = 5V. Reverse-current protection activates when the voltage on IN falls 6mV (or 20mV max) below the voltage on OUT. Before this happens, currents as high as several milliamperes can flow back through the device. Low-Battery-Detection Comparator The MAX882/MAX883/MAX884 provide a low-battery comparator that compares the voltage on the LBI pin to the 1.20V internal reference. LBO, an open-drain output, goes low when LBI is below 1.20V. Hysteresis of 7mV has been added to the low-battery comparator to provide noise immunity during switching. LBO remains functional in standby mode for the MAX882, but is undefined in OFF mode for the MAX883 and MAX884. Tie LBI to IN when not used. Use a resistor-divider network as shown in Figure 6 to set the low-battery trip voltage. Current into the LBI input is ±50nA (max), so R2 can be as large as 1MΩ. Add extra noise immunity by connecting a small capacitor from LBI to GND. Additional hysteresis can be added by connecting a high-value resistor from LBI to LBO. BATTERY CIN O.1µF OUTPUT VOLTAGE MAX882 MAX883 MAX884 LBI LBO ( ) ARE FOR MAX882. VLBI TRIP = VLBI OFF (STBY) * OFF (STBY) LBI ON/OFF SET GND COUT 2.2µF ( ) ARE FOR MAX882. * OPTIONAL REVERSE BATTERY PROTECTION Figure 7. Typical 3.3V or 5V Linear Regulator Circuit Applications Information The MAX882/MAX883/MAX884 are series linear regulators designed primarily for battery-powered systems. Figure 7 shows a typical application. Standby Mode vs. OFF Mode STBY is a comparator input that allows the user to set the standby-mode threshold voltage, while OFF is a logic-level input. When in standby mode, the output is disconnected from the input, but the biasing circuitry (including the low-battery comparator) is kept alive, causing the device to draw approximately 7µA. Standby mode is useful in applications where a lowbattery comparator function is still needed in shutdown. A logic low at the OFF pin turns off all biasing circuitry, including the LBI/LBO comparator, and reduces supply current to less than 1µA. OFF mode is useful for maximizing battery life. There is little difference in the time it takes to exit standby mode or OFF mode. Output Capacitor Selection and Regulator Stability An output filter capacitor is required at the MAX882/ MAX883/MAX884 OUT pin. The minimum output capacitance required for stability is 2.2µF. ______________________________________________________________________________________ 11 MAX882/MAX883/MAX884 OUT IN BATTERY OUTPUT VOLTAGE 70 A: COUT = 1µF B: COUT = 10µF C: COUT = 100µF 50 60 IOUT = 1mA MAX882/4-8b 60 MAX882/4-8a 80 40 50 PSRR (dB) PSRR (dB) MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators 40 30 C 30 20 MAX884 ∆VIN = 1VP-P CIN = 0µF COUT = 2.2µF 20 10 IOUT = 100mA A 0 0 100 101 102 103 104 105 106 FREQUEN Y (Hz) Figure 8a. Power-Supply Rejection Ratio vs. Ripple Frequency for Light and Heavy Loads The filter capacitor’s size depends primarily on the desired power-up time and load-transient responses. Load-transient response is improved by using larger output capacitors. The output capacitor’s equivalent series resistance (ESR) will not affect stability as long as the minimum capacitance requirement is observed. The type of capacitor selected is not critical, but it must remain above the minimum value over the full operating temperature range. Input Bypass Capacitor Normally, use 0.1µF to 10µF capacitors on the MAX882/ MAX883/MAX884 input. The best value depends primarily on the power-up slew rate of VIN, and on load and line transients. Larger input capacitor values provide better supply-noise rejection and line-transient response, as well as improved performance, when the supply has a high AC impedance. The type of input bypass capacitor used is not critical. 12 B MAX883 ∆VIN = 1VP-P CIN = 0µF IOUT = 100µA 10 101 102 103 104 105 106 FREQUENCY (Hz) Figure 8b. Power-Supply Rejection Ratio vs. Ripple Frequency for Various Output Capacitances Noise The MAX882/MAX883/MAX884 exhibit up to 4mVp-p of noise during normal operation. This is negligible in most applications. When using the MAX882/MAX883/ MAX884 for applications that include analog-to-digital converters (ADCs) with resolutions greater than 12 bits, consider the ADC’s power-supply rejection specifications. See the output noise plot in the Typical Operating Characteristics section. PSRR and Operation from Sources Other than Batteries The MAX882/MAX883/MAX884 are designed to achieve low dropout voltages and low quiescent currents in battery-powered systems. However, to gain these benefits, the devices must trade away powersupply noise rejection, as well as swift response to supply variations and load transients. For a 1mA load current, power-supply rejection ranges from 60dB down to 20dB at 2kHz. At higher frequencies, the circuit depends primarily on the characteristics of the output capacitor, and the PSRR increases (Figure 8). ______________________________________________________________________________________ 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators INPUT VOLTAGE OUTPUT VOLTAGE IN OUT LBI R1 COUT 2.2µF MAX882 D2 STBY CIN O.1µF R2 GND SET BACKUP BATTERY Figure 9. Short-Term Battery Backup Using the MAX882 When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the values of the input and output capacitors and employing passive filtering techniques. Do not use power supplies with ripple voltage exceeding 200mV at 100kHz. Overshoot and Transient Considerations The Typical Operating Characteristics section shows power-up, supply, and load-transient response graphs. On the load-transient graphs, two components of the output response can be observed: a DC shift from the output impedance due to the different load currents, and the transient response. Typical transients for step changes in the load current from 50mA to 250mA are 200mV. Increasing the output capacitor’s value attenuates transient spikes. During recovery from shutdown, overshoot is negligible if the output voltage has been given time to decay adequately. During power-up from VIN = 0, overshoot is typically less than 1% of VOUT. Short-Term Battery Backup Using the MAX882 Figure 9 illustrates a scheme for implementing battery backup for 3.3V circuits using the MAX882. When the supply voltage drops below some user-specified value based on resistors R1 and R2, the standby function activates, turning off the MAX882’s output. Under these conditions, the backup battery supplies power to the load. Reverse current protection prevents the battery from draining back through the regulator to the input. This application is limited to short-term battery backup for 3.3V circuits. The current drawn by the MAX882’s OUT pin at 3.3V during reverse-current protection is typically 8µA. It should not be used with the MAX883 and MAX884, since the OFF pin is a logic input, and indeterminate inputs can cause the regulator to turn on intermittently, draining the battery. Reverse Battery Protection Reverse battery protection can be added by including an inexpensive Schottky diode between the battery input and the regulator circuit, as shown in Figure 7. However, the dropout voltage of the regulator will be increased by the forward voltage drop of the diode. For example, the forward voltage of a standard 1N5817 Schottky diode is typically 0.29V at 200mA. ______________________________________________________________________________________ 13 MAX882/MAX883/MAX884 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 determines the useful end-of-life battery voltage. Because the MAX882/MAX883/MAX884 use a p-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current (see Electrical Characteristics). Quickly stepping up the input voltage from the dropout voltage can result in overshoot. MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators Ordering Information (continued) PART MAX883CPA TEMP RANGE 0°C to +70°C PINPACKAGE LB0 GND 8 PDIP MAX883CSA 0°C to +70°C 8 SO MAX883C/D 0°C to +70°C Dice* MAX883EPA -40°C to +85°C 8 PDIP MAX883ESA -40°C to +85°C 8 SO MAX883MPA/PR -55°C to +125°C 8 PDIP 0°C to +70°C 8 PDIP MAX884CPA ___________________Chip Topography MAX884CSA 0°C to +70°C 8 SO MAX884C/D 0°C to +70°C Dice* MAX884EPA -40°C to +85°C 8 PDIP MAX884ESA -40°C to +85°C 8 SO *Dice are tested at TJ = +25°C, DC parameters only. **Contact factory for availability. LBI SET OFF (MAX883/4) STBY (MAX882) 0.085" (2.159mm) OUT OUT IN 0.080" (2.032mm) NO DIRECT SUBSTRATE CONNECTION. THE N-SUBSTRATE IS INTERNALLY SWITCHED BETWEEN THE MORE POSITIVE OF IN OR OUT. 14 ______________________________________________________________________________________ 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators PACKAGE CODE DOCUMENT NO. 8 PDIP P8-T 21-0043 8 SO S8-6F 21-0041 PDIPN.EPS PACKAGE TYPE ______________________________________________________________________________________ 15 MAX882/MAX883/MAX884 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.053 0.069 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS MAX882/MAX883/MAX884 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D A B e FRONT VIEW A1 C 0∞-8∞ L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL 16 DOCUMENT CONTROL NO. 21-0041 ______________________________________________________________________________________ REV. B 1 1 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators REVISION NUMBER REVISION DATE 3 9/08 Added information for rugged plastic product. 14 4 7/09 Revised Ordering Information table. 14 DESCRIPTION PAGES CHANGED 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX882/MAX883/MAX884 Revision History
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