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MAXIM MAX1806 500mA Low-Voltage Linear Regulator in MAX handbook

1. GROUND PIN CURRENT vs GROUND PIN CURRENT vs POWER SUPPLY REJECTION RATIO LOAD CURRENT TEMPERATURE vs FREQUENCY Vin Vout 500mV E 5 8 lout 0 3 8 E 3 3 a 40 E E oc B7 e a 20 2 ge 10 Cour 10uF lout 50mA 0 100 200 300 400 500 600 700 800 40 15 10 35 60 85 0 01 0 1 1 10 100 000 LOAD CURRENT A TEMPERATURE C FREQUENCY kHz OUTPUT SPECTRAL NOISE DENSITY vs FREQUENCY OUTPUT NOISE DC TO 1MHz 10 MAX1806 toc11 Cour 10uF 8 I out 50mA 8 1 2 a Vout 2 01 1mV div wl a 001 E Vout 3 3V Rout 66Q 50mA 0 001 01 1 10 00 000 20ms div FREQUENCY kHz REGION OF STABLE Cour ESR vs LOAD CURRENT LOAD TRANSIENT RESPONSE MAX1806 toc13 MAX1806 toc12 our 200mA div Vour 20mV div REGION OF Cour ESR ABLE REGIO Vin Vout 500mV Cin 10uF j Rour 6600 TO 6 60 SmA TO 500mA 0 100 200 300 400 500 600 700 800 10us div FREQUENCY kHz AVLAX LAW 5 908 XVII MAX1806 500mA Low Voltage
2. Input Threshold SHDN Input Bias Current SHDN GND or IN Startup Time TSTART Cour 10uF time from SHDN high to POK high Dual Mode is a trademark of Maxim Integrated Products Inc 2 MAXIM 500mA Low Voltage Linear Regulator in MAX ELECTRICAL CHARACTERISTICS continued VIN VOUT SETPOINT 500 or ViN 2 25V whichever is greater SET GND SHDN IN TA 0 C to 85 C unless otherwise noted Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS POWER OK POK Output Low Voltage VOL Sinking 2mA Operating Voltage Range for 2 Valid Output Output High Leakage Current VPOK 5 5V Threshold Rising edge referred to VOUT NOMINAL THERMAL PROTECTION Thermal Shutdown Temperature TSHDN Thermal Shutdown Hysteresis ATSHDN ELECTRICAL CHARACTERISTICS VIN VOUT SETPOINT 500mV or 2 25V whichever is greater SET GND SHDN IN TA 40 C to 85 C unless other wise noted Typical values are at Ta 25 C Note 2 PARAMETER SYMBOL CONDITIONS Input Voltage VIN Input Undervoltage Lockout VuvLo Rising 40mV hysteresis Output Voltage Accuracy Preset Mode Adjustable Output Voltage SET Voltage Threshold Adjustable Mode aximum Output Current Short Circuit Current Limit SET Dual Mode Threshold SET Input Bias Current T 0 8V Ground Pin Current OUT 1 loUT 1mA to 500mA T 1mA to
3. JEDEC INCHES MILLIMETERS INCHES MILLIMETERS MIN MAX MIN MAX MIN MAX MIN MAX 0 037 0043 0 94 110 0 043 110 l 0 008 0006 0 05 015 0 000 0 006 005 015 B 0010 0014 025 0 36 0 010 0 016 025 8L uMAX EXP PAD EPS C 0 005 0 007 013 0 18 0 005 0 009 0 13 0 23 D 0 116 0120 2 95 3 05 0114 0122 29 34 e 0 0256 BSC 0 65 BSC 0 0256 BSC 0 64 BSC E 0116 0120 2 95 305 0114 0 122 2 9 34 H L 0 188 0 198 4 78 5 03 0 193 BSC 4 9 BSC 0 40 0 70 x EXPOSED PAD BOTTOM VIEW pA TOP VIEW i F FRONT VIEW NOTES 1 D amp E DO NOT INCLUDE MOLD FLASH 2 MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 0 15MM 006 3 CONTROLLING DIMENSION MILLIMETERS 4 MEETS MO 187 5 PAD FLUSH WITH BOTTOM OF PACKAGE WITHIN 002 AV ZA XI ZVI PROPRIETARY INFORMATION TITLE PACKAGE OUTLINE 8L uMAX EXPOSED PAD APPROVAL DOCUMENT CONTROL NO REV 1 A LA 21 0107 Note The MAX1806 has on exposed thermal pad on the bottom side of the package 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 Sun
4. Linear Regulator in Typical Operating Characteristics continued MAX1806EUA33 Vin Vour 500mV SHDN IN Cin 1 Cour 10uF TA 25 C unless otherwise noted LOAD TRANSIENT RESPONSE NEAR DROPOUT LINE TRANSIENT RESPONSE MAX1806 toc14 MAX1806 toc15 Vin 1V div 3V lout 200mA div Vout 50mV div Vin Vout 100mV Cin 10uF Rout 6600 TO 6 60 5mA TO 500mA 10us div 200us div Vout 10mV div SHUTDOWN WAVEFORM POK WAVEFORM MAX1806 toc16 MAX1806 toc17 2V VSHON 1V div 0 Vout 1V div 0 Rout 6 60 500 Rout 662 50mA 20us div 200us div Pin Description FUNCTION Regulator Input Supply voltage can range from 2 25V to 5 5V Bypass with a 1uF capacitor to GND see Capacitor Selection and Regulation Stability Connect both input pins together externally Open Drain Active Low Power OK Output POK remains low while the output voltage VouT is below the POK threshold Connect a 100kQ pullup resistor from POK to OUT Active Low Shutdown Input A logic low at SHDN reduces supply current to 0 02uA In shutdown the output is low Connect SHDN to IN for normal operation Ground This pin and the exposed pad also function as a heatsink Solder both to a large pad or to the circuit board ground plane to maximize power dissipation Voltage Setting Input Connect SET to GND for preset output Connect an external resistive voltage divider f
5. Low 210pA Ground Current 0 02 Shutdown Current Thermal Overload Protection 9 9 Output Current Limit Tiny 1 3W 8 Pin Package 9 9 9 9 Ordering Information PART MAX1806EUA _ TEMP RANGE 40 C to 85 C PIN PACKAGE 8 Power uMAX Selector Guide PART AND SUFFIX Vout V TOP MARK MAX1806EUAS33 MAX1806EUA25 MAX1806EUA18 MAX1806EUA15 MAX1806EUA08 Pin Configuration TOP VIEW MAXUM 7 MAX1806 Maxim Integrated Products 1 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 908LXVIN MAX1806 500mA Low Voltage Linear Regulator ABSOLUTE MAXIMUM RATINGS IN SHDN SET to GND 0 3V to 6V Operating Temperature OUT to GND cist tepore tts 0 3V to VIN 0 3V Junction Temperature Output Short Circuit Continuous Storage Temperature Range Continuous Power Dissipation TA 70 C Lead Temperature soldering 10s 8 Pin Power u MAX derate 17mW C above 70 1 3W in uMAX 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
6. sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS VIN VOUT SETPOINT 500mV or VIN 2 25V whichever is greater SET GND SHDN I noted Typical values are at Ta 25 C PARAMETER SYMBOL CONDITIONS TA 0 C to 85 C unless otherwise Input Voltage VIN Input Undervoltage Lockout VUVLO Rising 40mV hysteresis Output Voltage Accuracy Preset Mode Vout Ta 85 C lout 100mA TA 85 C loUT 1mA to 500mA Ta 0 C to 85 C IOUT 1mA to 500mA VIN gt VouT 0 5V Adjustable Output Voltage SET Voltage Threshold Adjustable Mode TA 85 C lout 100mA Ta 85 C lout 1mA to 500mA Ta 0 C to 85 C IOUT 1mA to 500mA ViN gt VouT 0 5V Maximum Output Current Short Circuit Current Limit Vour OV 1400 2300 SET Dual Mode Threshold 80 125 SET Input Bias Current Ground Pin Current VsET 0 8V T 1mA T 500mA 100 Dropout Voltage Note 1 VOUT 2 25V UT 500mA VOUT 2 8V Vout 4 0V Line Regulation Load Regulation Output Voltage Noise from Vour 100mV to 5 5V ILoAD 5mA IOUT 1mA to 500mA z to 1MHz Cour 10uF ESR lt 0 10 SHUTDOWN Shutdown Supply Current lorc SHDN GND Vin 55V VIH VIL ISHDN SHDN
7. 19 2018 Rev 0 4 01 500mA Low Voltage Linear Regulator General Description The MAX1806 low dropout linear regulator operates from a 2 25V to 5 5V supply and delivers a guaran teed 500mA load current with low 175mV dropout The high accuracy 1 output voltage is preset at an internally trimmed voltage see Selector Guide or can be adjusted from 0 8V to 4 5V with an external resis tive divider An internal PMOS pass transistor allows low 210 supply current making this device ideal for portable equipment such as personal digital assistants PDAs cellular phones cordless phones and other equip ment including base stations and docking stations Other features include an active low power OK output that indicates when the output is out of regulation a 2 shutdown mode short circuit protection and thermal shutdown protection The MAX1806 comes in a miniature 1 3W 8 pin power uMAX package with metal pad on the underside of the package Applications Notebook Computers Cellular and Cordless Telephones PDAs Palmtop Computers Base Stations USB Hubs Docking Stations Typical Operating Circuit Vout 2 25V TO 5 5V 0 8V TO 4 5V MAXIM MAX1806 MAXIM MI AALS Features Guaranteed 500mA Output Current Output Down to 0 8V Low 175mV Dropout at 500mA 1 Output Voltage Accuracy Preset at 0 8V 1 5V 1 8V 2 5V or 3 3V Adjustable from 0 8V to 4 5V Power OK Output
8. 500mA VOUT 2 25V Dropout Voltage Note 1 OUT 500mA VOUT 2 8V VOUT 4 0V Line Regulation Vin from Vour 100mV to 5 5V 5 0 175 Load Regulation OUT 1mA to 500mA SHUTDOWN Shutdown Supply Current SHDN GND VIN 5 5V 2 5V lt VIN lt 5 5V 2 5V lt VIN lt 5 5V SHDN Input Bias Current SHDN GND or IN SHDN Input Threshold MAXIM 3 908LXVIN MAX1806 500mA Low Voltage Linear Regulator in ELECTRICAL CHARACTERISTICS continued VIN VOUT SETPOINT 500mV or 2 25V whichever is greater SET GND SHDN IN Ta 40 C to 85 C unless other wise noted Typical values are at Ta 25 C Note 2 PARAMETER SYMBOL CONDITIONS POWER OK POK Output Low Voltage Sinking 2mA Operating Voltage Range for Valid POK Output Output High Leakage Current VPOK 5 5V Sinking 100 Threshold Rising edge referred to VOUT NOMINAL Note 1 Dropout voltage is defined as Vin Vout when Vout is 100mV below the value of Vout and when Vin VoUT NOM 0 5V For 2 25V lt VouT lt 4 0V dropout voltage limits are linearly interpolated from the values listed For Vout lt 4 0V dropout voltage limit is equal to the value for VouT 4 0V Note 2 Specifications to 40 C are guaranteed by design not production tested Typical Operating Characteristics MAX1806EUA33 Vin Vour 500mV SHDN
9. IN Cin 1 Cour 10uF TA 25 C unless otherwise noted OUTPUT VOLTAGE vs INPUT VOLTAGE OUTPUT VOLTAGE vs LOAD CURRENT OUTPUT VOLTAGE vs TEMPERATURE 8 2e 8 Ur 500mV 8 331 E 3 30 5 e 5 E 329 E Z E p E 25 E 327 3 325 15 20 25 30 35 40 45 50 55 60 0 100 200 300 400 500 600 700 800 40 5 10 35 60 85 INPUT VOLTAGE LOAD CURRENT mA TEMPERATURE C DROPOUT VOLTAGE vs GROUND PIN CURRENT vs DROPOUT VOLTAGE vs LOAD CURRENT OUTPUT VOLTAGE INPUT VOLTAGE i 600 m E 550 E E 500 lout 500mA 2 z 026 45 S 400 p amp 350 2 gt 0 22 300 amp 250 lor OmA __ 2 amp 020 5 ES 5 200 a z 0 18 150 100 0 16 0 14 0 0 100 200 300 400 500 600 700 800 20 25 30 35 40 45 20 25 30 35 40 45 50 55 60 LOAD CURRENT mA OUTPUT VOLTAGE V INPUT VOLTAGE V 4 MAXIM 500mA Low Voltage Linear Regulator in MAX Typical Operating Characteristics continued MAX1806EUA33 Vin Vour 500mV SHDN IN Cin 1 Cour 10uF TA 25 C unless otherwise noted
10. er thermal sensor and shutdown logic Internal P Channel Pass Transistor The MAX1806 features a 0 40 P channel MOSFET pass transistor Unlike similar designs using PNP pass tran sistors P channel MOSFETs require no base drive which reduces operating current PNP based regula tors also waste considerable current in dropout when the pass transistor saturates and use high base drive currents under large loads The MAX1806 does not suf fer from these problems Output Voltage Selection The MAX1806 s dual mode operation allows operation in either a preset voltage mode or an adjustable mode Connect SET to GND to select the preset output volt age The two digit part number suffix identifies the out put voltage see Selector Guide For example the MAX1806EUA33 has a preset 3 3V output voltage The output voltage may also be adjusted by connecting a voltage divider from OUT to SET Figure 2 Select R2 in the 25kQ to 100kQ range Calculate R1 with the follow ing equation R1 R2 Vour VsET 1 where 0 8V and Vour may range from 0 8V to 4 5V Shutdown Drive SHDN low to enter shutdown During shutdown the output is disconnected from the input and supply MAXIM current drops to 2 When in shutdown POK pulls low The capacitance and load at OUT determine the rate at which Vour decays SHDN can be pulled as high as 6V regardless of the input and output voltage Power OK Output The POK output pull
11. nyvale CA 94086 408 737 7600 2001 Maxim Integrated Products Printed USA MAXIM is registered trademark of Maxim Integrated Products
12. rom OUT to SET to set the output voltage between 0 8V 4 5V The SET regulation voltage is 800mV Regulator Output OUT sources up to 500mA Bypass OUT with 10uF low ESR capacitor to GND Connect both OUT pins together externally 6 AVLAZCLAVI 500mA Low Voltage Linear Regulator in MAX Detailed Description The MAX1806 is a low dropout low quiescent current linear regulator The device supplies loads up to 500mA and is available with preset output voltages As illustrated in Figure 1 the MAX1806 includes a 0 8V ref erence error amplifier P channel pass transistor and internal feedback voltage divider The reference is connected to the error amplifier which compares it 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 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 inter nal resistive voltage divider connected to OUT or an external resistor network connected to SET The dual mode comparator examines VsET and selects the feed back path If Vsgr is below 35mV the internal feedback path is used and the output is regulated to the factory preset voltage Additional blocks include an output cur rent limit
13. s low when OUT is less than 93 of the nominal regulation voltage Once OUT exceeds 93 of the nominal voltage POK goes high imped ance POK is an open drain N channel output To obtain a logic voltage output connect a pullup resistor from POK to OUT A 100kQ resistor works well for most applications POK can be used to signal a microcon troller uC or drive an external LED to indicate power failure When the MAX1806 is shutdown POK is held low independent of the output voltage If unused leave POK grounded or unconnected Current Limit The MAX1806 monitors and controls the pass transis tors gate voltage limiting the output current to 1 4A typ The output can be shorted to ground for an indefi nite period of time without damaging the part Thermal Overload Protection Thermal overload protection limits total power dissipa tion in the MAX1806 When the junction temperature exceeds TJ 170 C a thermal sensor turns off the pass transistor allowing the device to cool The thermal sensor turns the pass transistor on again after the junc tion temperature cools by 20 C resulting in a pulsed output during continuous thermal overload conditions Thermal overload protection protects the MAX1806 in the event of fault conditions For continuous operation do not exceed the absolute maximum junction temper ature rating of Ty 150 C Operating Region and Power Dissipation The MAX1806 s maximum power dissipation depends on the
14. thermal resistance of the IC package and circuit board the temperature difference between the die junction and ambient air and the rate of air flow The power dissipated in the device is IOUT X VIN VOUT The maximum allowed power dissipation is 1 3W or PMAX TJ MAX TA 8 C where TJ TA is the temperature difference between the MAX1806 die junction and the surrounding air is the thermal resistance from the junction to the case and is the thermal resistance from the case through the PC board copper traces and other materi als to the surrounding air The MAX1806 package fea tures an exposed thermal pad on its underside This pad lowers the package s thermal resistance by provid 7 908 XVII MAX1806 500mA Low Voltage Linear Regulator in 2 25V TO 5 5V PRESET MODE Vout 0 8V TO 3 3V Cour SHUTDOWN LOGIC ERROR LOGIC SUPPLY AMPLIFIER VOLTAGE Vout MAXIM MAX1806 POK To Uu 93 VREF Figure 1 Functional Diagram ing a direct heat conduction path from the die to the PC board Connect the exposed backside pad and GND to the system ground using a large pad or ground plane or multiple vias to the ground plane layer The MAX1806 delivers up to 0 5A RMS and operates with input voltages up to 5 5V but not simultaneously High output currents can only be sustained when input output differential is
15. ut LIMIT MAXIM MAX1806 2 BE EE a 5 gt lt POWER uMAX PACKAGE OPERATING REGION AT Ty max 150 C 0 05 10 15 20 25 30 35 40 45 5 0 INPUT OUTPUT VOLTAGE DIFFERENTIAL V Figure 3 Power Operating Regions Maximum Output Current vs Supply Voltage Figure 2 Adjustable Output Using External Feedback Resistors response graphs see Typical Operating Characteris tics 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 overshoot for a step change in the load cur rent from 5mA to 500mA is 40mV Increasing the output capacitor s value and decreasing the ESR attenuates the overshoot Input Output Dropout Voltage A regulator s minimum input to output voltage differen tial dropout voltage determines the lowest usable sup ply voltage In battery powered systems this determines the useful end of life battery voltage Because the MAX1806 uses a P channel MOSFET pass transistor its dropout voltage is a function of drain to source on resistance RDS ON multiplied by the load current see Typical Operating Characteristics VDROPOUT VIN VOUT RDS ON X lOUT Chip Information TRANSISTOR COUNT 949 MAXIM 9 908LXVIN MAX1806 500mA Low Voltage Linear Regulator in MAX Package Information
16. within the limits outlined Applications Information Capacitor Selection and Regulator Stability Connect a 1uF capacitor between IN and ground and a 1 low equivalent series resistance ESR capacitor between OUT and ground The input capacitor CIN lowers the source impedance of the input supply Reduce noise and improve load transient response stability and power supply rejection by using larger output capacitors The output capacitors Cour ESR affects stability and output noise Use output capacitors with an ESR of 0 1Q or less to ensure stability and opti mum transient response Surface mount ceramic capacitors have very low ESR and are commonly avail able in values up to 10uF Connect and Cour as close to the MAX1806 as possible Noise PSRR and Transient Response The MAX1806 is designed to operate with low dropout voltages and low quiescent currents while still main taining good noise transient response and AC rejec tion See the Typical Operating Characteristics for a plot of Power Supply Rejection Ratio PSRR vs Freq uency When operating from noisy sources 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 MAX1806 load transient MAXIM 500mA Low Voltage Linear Regulator in MAX UOUS CURRENT LIMIT OUT 85 C 70 YPICAL Vpropo

MAXIM MAX1806 500mA Low-Voltage Linear Regulator in MAX handbook

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