Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout

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Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout

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19-1301; 1/01
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
_General Description
MAX8877/MAX8878 low-noise, low-dropout linear regulators operate from 2.5V 6.5V input deliver 150mA. These devices pin-compatible with industry-standard '2982 offer improved dropout voltage. Typical output noise 30µVRMS, typical dropout only 165mV 150mA. output voltage preset voltages range 1.5V 5.0V, 100mV increments. Designed with internal P-channel MOSFET pass transistor, MAX8877/MAX8878 maintain 100µA supply current, independent load current dropout voltage. Other features include 10nA logic-controlled shutdown mode, short-circuit thermal-shutdown protection, reverse battery protection. MAX8878 also includes auto-discharge function, which actively discharges output voltage ground when device placed shutdown. Both devices come regular thin 5-pin SOT23 packages.
_Features
Pin-Compatible with Industry-Standard '2982 Output Noise: 30µVRMS 55mV Dropout 50mA Output (165mV 150mA output) 85µA No-Load Supply Current 100µA Operating Supply Current (even dropout) Thermal-Overload Short-Circuit Protection Reverse Battery Protection Output Current Limit Preset Output Voltages (±1.4% Accuracy) 10nA Logic-Controlled Shutdown
MAX8877/MAX8878
_Applications
Cellular Telephones Cordless Telephones Telephones PCMCIA Cards Modems Hand-Held Instruments Palmtop Computers Electronic Planners
_Ordering Information
PART** MAX8877C/Dxy MAX8877EUKxy-T MAX8877EZKxy-T MAX8878C/Dxy MAX8878EUKxy-T TEMP. RANGE +70°C -40°C +85°C -40°C +85°C +70°C -40°C +85°C PIN-PACKAGE Dice* SOT23-5 Regular SOT23-5 Thin Dice* SOT23-5 Regular
MAX8878EZKxy-T -40°C +85°C SOT23-5 Thin *Dice tested +25°C only. **xy output voltage code (see Expanded Ordering Information table data sheet).
_Typical Operating Circuit
INPUT 2.5V 6.5V 0.01µF COUT 3.3µF OUTPUT PRESET 1.5V 5.0V 150mA
_Pin Configuration
VIEW
MAX8877 MAX8878
SHDN
MAX8877 MAX8878
SHDN
SOT23-5 REGULAR THIN Maxim Integrated Products
price, delivery, place orders, please contact Maxim Distribution 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
ABSOLUTE MAXIMUM RATINGS
.-7V Output Short-Circuit Duration .Infinite SHDN GND.-7V SHDN .-7V +0.3V OUT, .-0.3V (VIN 0.3V) Continuous Power Dissipation +70°C) SOT23-5 Regular (derate 7.1mW/°C above +70°C) .571mW SOT23-5 Thin (derate 9.1mW/°C above +70°C) .727mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C (Regular).140°C/W (Thin).110°C/W Storage Temperature.-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN VOUT(NOMINAL) 0.5V 2.5V (whichever greater), -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Input Voltage SYMBOL IOUT 0.1mA, +25°C, VOUT 2.5V IOUT 0.1mA 120mA, -40°C +85°C, VOUT 2.5V IOUT 0.1mA, +25°C, VOUT 2.5V IOUT 0.1mA 120mA, -40°C +85°C, VOUT 2.5V Maximum Output Current Current Limit Ground Current ILIM load IOUT 150mA IOUT Dropout Voltage (Note IOUT 50mA IOUT 150mA Line Regulation Load Regulation Output Voltage Noise SHUTDOWN SHDN Input Threshold SHDN Input Bias Current Shutdown Supply Current Shutdown Exit Delay (Note Resistance Shutdown Discharge SHDN IQ(SHDN) 2.5V 5.5V 2.5V 5.5V SHDN VOUT 0.1µF COUT 1µF, load MAX8878 only +25°C +85°C +25°C +85°C +25°C -40°C +85°C 0.01 0.01 VLNR VLDR 2.5V (VOUT 0.1V) 6.5V, IOUT IOUT 0.1mA 120mA, COUT 10Hz 100kHz, 0.01µF COUT 10µF COUT 100µF -0.15 CONDITIONS -1.4 -3.5 0.01 0.15 0.04 %/mA µVRMS UNITS
Output Voltage Accuracy
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
ELECTRICAL CHARACTERISTICS (continued)
(VIN VOUT(NOMINAL) 0.5V 2.5V (whichever greater), -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis TSHDN TSHDN SYMBOL CONDITIONS UNITS
MAX8877/MAX8878
Note Limits 100% production tested +25°C. Limits over operating temperature range guaranteed through correlation using Statistical Quality Control (SQC) Methods. Note dropout voltage defined VOUT, when VOUT 100mV below value VOUT VOUT 0.5V. (Only applicable VOUT +2.5V +5V.) Note Time needed VOUT reach final value.
_Typical Operating Characteristics
(VIN VOUT(NOMINAL) 0.5V 2.5V (whichever greater), 1µF, COUT 1µF, 0.01µF, +25°C, unless otherwise noted.)
OUTPUT VOLTAGE LOAD CURRENT (MAX887_EUK25)
MAX8877-01
OUTPUT VOLTAGE LOAD CURRENT (MAX887_EUK50)
MAX8877-02
GROUND CURRENT LOAD CURRENT
GROUND CURRENT (µA) MAX887_EUK25 MAX887_EUK50
MAX8877-03
2.60
OUTPUT VOLTAGE
2.50
OUTPUT VOLTAGE
2.55
2.45
2.40 LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
GROUND CURRENT INPUT VOLTAGE (MAX887_EUK25)
MAX8877-04
GROUND CURRENT INPUT VOLTAGE (MAX887_EUK50)
MAX8877-05
OUTPUT VOLTAGE INPUT VOLTAGE
LOAD OUTPUT VOLTAGE MAX887_EUK50 MAX887_EUK25
MAX8877-06
ILOAD 50mA GROUND CURRENT (µA) LOAD INPUT VOLTAGE
ILOAD 50mA
GROUND CURRENT (µA)
LOAD INPUT VOLTAGE
INPUT VOLTAGE
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
Typical Operating Characteristics (continued)
(VIN VOUT(NOMINAL) 0.5V 2.5V (whichever greater), 1µF, COUT 1µF, 0.01µF, +25°C, unless otherwise noted.)
OUTPUT VOLTAGE TEMPERATURE (MAX887_EUK25)
MAX8877-07
OUTPUT VOLTAGE TEMPERATURE (MAX887_EUK50)
MAX8877-08
GROUND CURRENT TEMPERATURE
GROUND CURRENT (µA) MAX887_EUK25 MAX887_EUK50 ILOAD 50mA
MAX8877-09 MAX8877-15 MAX8877-12
2.60 ILOAD 50mA 2.55
ILOAD 50mA
OUTPUT VOLTAGE
2.50
OUTPUT VOLTAGE
2.45
2.40 TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DROPOUT VOLTAGE LOAD CURRENT (MAX887_EUK25)
MAX8877-10
DROPOUT VOLTAGE LOAD CURRENT (MAX887_EUK50)
MAX8877-11
POWER-SUPPLY REJECTION RATIO FREQUENCY
PSRR (dB)
+85°C +25°C -40°C
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
+85°C +25°C
COUT 10µF
ILOAD 50mA 0.1µF 0.01 1000 COUT
-40°C
LOAD CURRENT (mA)
LOAD CURRENT (mA)
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY FREQUENCY
MAX8877-13
OUTPUT NOISE CAPACITANCE
OUTPUT NOISE (µVRMS) MAX887_EUK50 MAX887_EUK25 0.001 0.01 CAPACITANCE (µF) MAX887_EUK30 COUT 10µF ILOAD 10mA 10Hz 100kHz
MAX8877-14
OUTPUT NOISE LOAD CURRENT
OUTPUT NOISE (µVRMS) MAX887_EUK30 COUT 10µF 0.01µF 10Hz 100kHz 1000 MAX887_EUK25 MAX887_EUK50
OUTPUT NOISE SPECTRAL DENSITY (µV/Hz)
0.01µF ILOAD 10mA
COUT COUT 10µF 0.01 FREQUENCY (kHz) 1000
LOAD CURRENT (mA)
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
Typical Operating Characteristics (continued)
(VIN VOUT(NOMINAL) 0.5V 2.5V (whichever greater), 1µF, COUT 1µF, 0.01µF, +25°C, unless otherwise noted.)
OUTPUT NOISE 10Hz 100kHz
MAX8877-16
MAX8877/MAX8878
REGION STABLE COUT LOAD CURRENT
MAX8877-17
COUT
COUT 10µF
VOUT 50µV/div
STABLE REGION
COUT
0.01
1ms/div MAX887_EUK25, COUT 10µF, ILOAD 10mA, 0.1µF
LOAD CURRENT (mA)
LINE-TRANSIENT RESPONSE
MAX8877-18
LOAD-TRANSIENT RESPONSE
MAX8877-19
LOAD-TRANSIENT RESPONSE NEAR DROPOUT
MAX8877-20
3.01V 3.00V 2.99V VOUT
3.01V 3.00V 2.99V VOUT
3.001V 3.000V 2.999V VOUT
50mA ILOAD 50mA ILOAD
100µs/div MAX887_EUK30, ILOAD 50mA
10µs/div MAX887_EUK30, VOUT 0.5V, 10µF, ILOAD 50mA
10µs/div MAX887_EUK30, VOUT 0.1V, 10µF, ILOAD 50mA
MAX887_EUK25 SHUTDOWN EXIT DELAY
MAX8877-21
MAX887_EUK50 SHUTDOWN EXIT DELAY
MAX8877-22
ENTERING SHUTDOWN
MAX8877-23
0.01µF
VSHDN
0.01µF
VSHDN
SHDN
0.1µF
VOUT
0.1µF
VOUT VOUT
5µs/div MAX887_EUK25, ILOAD 50mA 5µs/div MAX887_EUK50, ILOAD 50mA 500µs/div MAX8878, LOAD
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
_Pin Description
NAME SHDN FUNCTION Regulator Input. Supply voltage range from 2.5V 6.5V. Bypass with capacitor (see Capacitor Selection Regulator Stability section). Ground. This also functions heatsink. Solder large circuit-board ground plane maximize power dissipation. Active-Low Shutdown Input. logic reduces supply current 10nA. MAX8878, logic also causes output voltage discharge GND. Connect normal operation. Reference-Noise Bypass. Bypass with low-leakage, 0.01µF ceramic capacitor reduced noise output. Regulator Output. Sources 150mA. Bypass with (<0.2 typical ESR) capacitor VOUT 2.5V 3.3µF VOUT 2.5V.
_Detailed Description
MAX8877/MAX8878 low-noise, low-dropout, low-quiescent-current linear regulators designed primarily battery-powered applications. parts available with preset output voltages ranging from 1.5V 100mV increments. These devices supply loads 150mA. illustrated Figure MAX8877/MAX8878 consist 1.25V reference, error amplifier, P-channel pass transistor, internal feedback voltage divider. 1.25V bandgap reference connected error amplifier's inverting input. error amplifier compares this reference with feedback voltage amplifies difference. feedback voltage lower than
REVERSE BATTERY PROTECTION
reference voltage, pass-transistor gate pulled lower, which allows more current pass output increases output voltage. feedback voltage high, pass-transistor gate pulled allowing less current pass output. output voltage back through internal resistor voltage divider connected pin. external bypass capacitor connected reduces noise output. Additional blocks include current limiter, reverse battery protection, thermal sensor, shutdown logic. MAX8878 also includes auto-discharge function, which actively discharges output voltage ground when device placed shutdown mode.
SHDN
MAX8877 MAX8878
SHUTDOWN POWER-ON CONTROL
ERROR
DRIVER WITH ILIMIT
THERMAL SENSOR 1.25V
AUTO-DISCHARGE, MAX8878 ONLY
Figure Functional Diagram
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
Output Voltage
MAX8877/MAX8878 supplied with factory-set output voltages from 1.5V 5.0V, 100mV increments. Except MAX887_EUK29 MAX887_EUK32 (which have output voltage preset 2.84V 3.15V, respectively), two-digit suffix allows customer choose output voltage 100mV increments. example, MAX8877EUK33 preset output voltage 3.3V (see Expanded Ordering Information). PMAX where temperature difference between MAX8877/MAX8878 junction surrounding air, thermal resistance package, thermal resistance through printed circuit board, copper traces, other materials surrounding air. MAX8877/MAX8878 performs dual function providing electrical connection ground channeling heat away. Connect ground using large ground plane.
MAX8877/MAX8878
Internal P-Channel Pass Transistor
MAX8877/MAX8878 feature typical P-channel MOSFET pass transistor. This provides several advantages over similar designs using pass transistors, including longer battery life. P-channel MOSFET requires base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current dropout when pass transistor saturates. They also high base-drive currents under large loads. MAX8877/MAX8878 suffer from these problems consume only 100µA quiescent current whether dropout, light-load, heavy-load applications (see Typical Operating Characteristics).
Reverse Battery Protection
MAX8877/MAX8878 have unique protection scheme that limits reverse supply current when either SHDN falls below ground. Their circuitry monitors polarity these pins disconnects internal circuitry parasitic diodes when battery reversed. This feature prevents device damage.
Noise Reduction
external 0.01µF bypass capacitor conjunction with internal 200k resistor, creates 80Hz lowpass filter noise reduction. MAX8877/MAX8878 exhibit 30µVRMS output voltage noise with 0.01µF COUT 10µF. This negligible most applications. Start-up time minimized power-on circuit that pre-charges bypass capacitor. Typical Operating Characteristics section shows graphs Noise Capacitance, Noise Load Current, Output Noise Spectral Density.
Current Limit
MAX8877/MAX8878 include current limiter, which monitors controls pass transistor's gate voltage, limiting output current 390mA. design purposes, consider current limit 160mA minimum 500mA maximum. output shorted ground indefinite amount time without damaging part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation MAX8877/MAX8878. When junction temperature exceeds +155°C, thermal sensor signals shutdown logic, turning pass transistor allowing cool. thermal sensor will turn pass transistor again after IC's junction temperature cools 15°C, resulting pulsed output during continuous thermal-overload conditions. Thermal-overload protection designed protect MAX8877/MAX8878 event fault conditions. continual operation, exceed absolute maximum junction-temperature rating +150°C.
_Applications Information
Capacitor Selection Regulator Stability
Normally, capacitor MAX8877/ MAX8878's input 10µF capacitor output. Larger input capacitor values lower ESRs provide better supply-noise rejection line-transient response. Reduce noise improve load-transient response, stability, power-supply rejection using large output capacitors. stable operation over full temperature range with load currents 150mA, (min) ceramic capacitor recommended VOUT 2.5V 3.3µF VOUT 2.5V. Note that some ceramic dielectrics exhibit large capacitance variation with temperature. With dielectrics such Y5V, necessary increase capacitance factor more ensure stability temperatures below -10°C. With dielectrics, should sufficient operating temperatures VOUT 2.5V. graph Region
Operating Region Power Dissipation
MAX8877/MAX8878's maximum power dissipation depends thermal resistance case circuit board, temperature difference between junction ambient air, rate flow. power dissipation across device IOUT (VIN VOUT). maximum power dissipation
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
Stable Load Current shown Typical Operating Characteristics. 0.01µF bypass capacitor output voltage noise. Increasing capacitance will slightly decrease output noise, increase start-up time. Values above 0.1µF provide performance advantage recommended (see Shutdown Exit Delay graphs Typical Operating Characteristics). components output response: shift from output impedance load current change, transient response. Typical transient step change load current from 50mA 12mV. Increasing output capacitor's value decreasing attenuates overshoot.
Input-Output (Dropout) Voltage
output voltage greater than minimum input voltage (2.5V), regulator's minimum input-output voltage differential dropout voltage) determines lowest usable supply voltage. battery-powered systems, this will determine useful end-of-life battery voltage. Because MAX8877/MAX8878 Pchannel MOSFET pass transistor, their dropout voltage function drain-to-source on-resistance (RDS(ON)) multiplied load current (see Typical Operating Characteristics).
PSRR Operation from Sources Other than Batteries
MAX8877/MAX8878 designed deliver dropout voltages quiescent currents batterypowered systems. Power-supply rejection 63dB frequencies rolls above 10kHz. Power-Supply Rejection Ratio Frequency graph Typical Operating Characteristics. When operating from sources other than batteries, improved supply-noise rejection transient response achieved increasing values input output bypass capacitors, through passive filtering techniques. Typical Operating Characteristics show MAX8877/MAX8878's line- loadtransient responses.
_Chip Information
TRANSISTOR COUNT: SUBSTRATE CONNECTED
Load-Transient Considerations
MAX8877/MAX8878 load-transient response graphs (see Typical Operating Characteristics) show
OUTPUT VOLTAGE (xy) CODE REGULAR SOT23 MAX887_EUK15-T MAX887_EUK18-T MAX887_EUK25-T MAX887_EUK28-T MAX887_EUK29-T MAX887_EUK30-T MAX887_EUK32-T MAX887_EUK33-T MAX887_EUK36-T MAX887_EUK50-T THIN SOT23 MAX887_EZK15-T MAX887_EZK18-T MAX887_EZK25-T MAX887_EZK28-T MAX887_EZK29-T MAX887_EZK30-T MAX887_EZK32-T MAX887_EZK33-T MAX887_EZK36-T MAX887_EZK50-T PRESET OUTPUT VOLTAGE 1.50 1.80 2.50 2.80 2.84 3.00 3.15 3.30 3.60 5.00 x.y0
Expanded Ordering Information
MARK MAX8877 REGULAR ADRG ADQT ACBM ACBN ACBO ACBP ACBQ ACBR ACDB ACBS MAX8877 THIN AAAA AAAB AAAC AAAD ADPM AAAE AAAF AAAG AAAH AAAI MAX8878 REGULAR ADQV ADRH ACBT ACBU ACBV ACBW ACBX ACBY ACDC ACBZ MAX8878 THIN AAAJ AAAK AAAL AAAM ADPO AAAN AAAO AAAP AAAQ AAAR
Other xy***
***Other between 1.5V 5.0V available 100mV increments. Contact factory other versions. Minimum order quantity 25,000 units.
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
Package Information
SOT5L.EPS
Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout MAX8877/MAX8878
Package Information (continued)
THIN SOT23.EPS
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout

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