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MAX1806EUA15+

hot MAX1806EUA15+

MAX1806EUA15+

For Reference Only

Part Number MAX1806EUA15+
Manufacturer Maxim Integrated
Description IC REG LIN POS ADJ 500MA 8-UMAX
Datasheet MAX1806EUA15+ Datasheet
Package 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
In Stock 332 piece(s)
Unit Price $ 3.96 *
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MAX1806EUA15+ Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - Linear
Datasheet MAX1806EUA15+ Datasheet
Package8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Series-
Output ConfigurationPositive
Output TypeAdjustable (Fixed)
Number of Regulators1
Voltage - Input (Max)5.5V
Voltage - Output (Min/Fixed)0.8V (1.5V)
Voltage - Output (Max)4.5V
Current - Output500mA
Current - Supply400µA
Control FeaturesEnable, Power Good
Protection FeaturesOver Current, Over Temperature, Short Circuit
Operating Temperature-40°C ~ 85°C
Mounting TypeSurface Mount
Package / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Supplier Device Package8-uMax-EP

MAX1806EUA15+ Datasheet

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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 210µA 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 0.02µA shutdown mode, short-circuit protection, and thermal shutdown protection. The MAX1806 comes in a miniature 1.3W, 8-pin power-µMAX package with a metal pad on the underside of the package. Applications Notebook Computers Cellular and Cordless Telephones PDAs Palmtop Computers Base Stations USB Hubs Docking Stations 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  Low 210µA Ground Current  0.02µA Shutdown Current  Thermal Overload Protection  Output Current Limit  Tiny 1.3W, 8-Pin Power-µMAX Package M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX ________________________________________________________________ Maxim Integrated Products 1 SET GNDSHDN 1 2 8 7 OUT OUTIN POK IN µMAX TOP VIEW 3 4 6 5 MAX1806 Pin Configuration Ordering Information NC MAX1806 IN CIN 1µF COUT 10µF RPOK 100kΩ VIN +2.25V TO +5.5V ON OFF SHDN OUT VOUT 0.8V TO 4.5V POK GNDSET TO µC Typical Operating Circuit 19-2018; Rev 0; 4/01 PART T EM P. R A N G E PIN-PACKAGE MAX1806EUA_ _ -40°C to +85°C 8 Power-µMAX Selector Guide PART AND SUFFIX VOUT (V) TOP MARK MAX1806EUA33 3.3 AAAG MAX1806EUA25 2.5 AAAH MAX1806EUA18 1.8 AAAI MAX1806EUA15 1.5 AAAJ MAX1806EUA08 0.8 AAAK 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.

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (VIN = VOUT(SETPOINT) + 500mV 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.) 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. IN, SHDN, POK, SET to GND ...................................-0.3V to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin Power-µMAX (derate 17mW/°C above +70°C).......1.3W Operating Temperature .......................................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage VIN 2.25 5.5 V Input Undervoltage Lockout VUVLO Rising, 40mV hysteresis 1.85 2.0 2.15 V TA = +85°C, IOUT = 100mA -1 +1 TA = +85°C, IOUT = 1mA to 500mA -1.5 +1.5Output Voltage Accuracy (Preset Mode) VOUT TA = 0°C to +85°C, IOUT = 1mA to 500mA, VIN > VOUT + 0.5V -3 +3 % Adjustable Output Voltage 0.8 4.5 V TA = +85°C, IOUT = 100mA 790 810 TA = +85°C, IOUT = 1mA to 500mA 786 814SET Voltage Threshold (Adjustable Mode) VSET TA = 0°C to +85°C, IOUT = 1mA to 500mA, VIN > VOUT + 0.5V 774 800 826 mV Maximum Output Current IOUT 500 m ARM S Short-Circuit Current Limit ILIM VOUT = 0V 700 1400 2300 mA SET Dual Mode™ Threshold 35 80 125 mV SET Input Bias Current ISET VSET = +0.8V -100 +100 nA IOUT = 1mA 210 400 Ground-Pin Current IQ IOUT = 500mA 575 µA VOUT = +2.25V 259 384 VOUT = +2.8V 201 315Dropout Voltage (Note 1) IOUT = 500mA VOUT = +4.0V 147 255 mV Line Regulation ∆VLNR V I N fr om ( V OU T + 100m V ) to 5.5V , IL OA D = 5m A 0 0.125 %/V Load Regulation ∆VLDR IOUT = 1mA to 500mA 15.5 35 p p m /m A Output Voltage Noise 10Hz to 1MHz, COUT = 10µF (ESR < 0.1Ω) 300 µVRMS SHUTDOWN Shutdown Supply Current IOFF SHDN = GND, VIN = 5.5V 0.02 5 µA VIH 1.6 SHDN Input Threshold VIL 0.6 V SHDN Input Bias Current I SHDN SHDN = GND or IN 10 100 nA Startup Time TSTART C OUT = 10µF, ti m e fr om SHDN hig h to P OK hig h 40 µs Dual Mode is a trademark of Maxim Integrated Products, Inc.

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(SETPOINT) + 500mV 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.) ELECTRICAL CHARACTERISTICS (VIN = VOUT(SETPOINT) + 500mV or VIN = +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 MIN TYP MAX UNITS Input Voltage VIN 2.25 5.5 V Input Undervoltage Lockout VUVLO Rising, 40mV hysteresis 1.85 2.15 V Output Voltage Accuracy (Preset Mode) VOUT IOUT = 1mA to 500mA -4 +4 % Adjustable Output Voltage 0.8 4.5 V SET Voltage Threshold (Adjustable Mode) VSET IOUT = 1mA to 500mA 766 834 mV Maximum Output Current IOUT 500 m ARM S Short-Circuit Current Limit ILIM VOUT = 0V 700 2500 mA SET Dual Mode™ Threshold 35 125 mV SET Input Bias Current ISET VSET = +0.8V -100 +100 nA Ground-Pin Current IQ IOUT = 1mA 400 µA VOUT = +2.25V 259 384 VOUT = +2.8V 201 315Dropout Voltage (Note 1) IOUT = 500mA VOUT = +4.0V 147 255 mV Line Regulation ∆VLNR V I N fr om ( V OU T + 100m V ) to 5.5V , IL OA D = 5m A -0.175 +0.175 %/V Load Regulation ∆VLDR IOUT = 1mA to 500mA 35 p p m /m A SHUTDOWN Shutdown Supply Current IOFF SHDN = GND, VIN = 5.5V 5 µA VIH 2.5V < VIN < 5.5V 1.6 SHDN Input Threshold VIL 2.5V < VIN < 5.5V 0.6 V SHDN Input Bias Current I SHDN SHDN = GND or IN 100 nA PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER-OK POK Output Low Voltage VOL Sinking 2mA 5 50 mV Operating Voltage Range for Valid POK Output Sinking 100µA 1.0 5.5 V Output High-Leakage Current VPOK = +5.5V 100 nA Threshold Rising edge, referred to VOUT(NOMINAL) 90 93 96 % THERMAL PROTECTION Ther m al S hutd own Tem p erature TSHDN 170 °C Thermal Shutdown Hysteresis ∆TSHDN 20 °C

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX 4 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(SETPOINT) + 500mV or VIN = +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 MIN TYP MAX UNITS POWER-OK POK Output Low Voltage VOL Sinking 2mA 50 mV Operating Voltage Range for Valid POK Output Sinking 100µA 1.0 5.5 V Output High-Leakage Current VPOK = +5.5V 100 nA Threshold Rising edge, referred to VOUT(NOMINAL) 89 97 % 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 ≤ VOUT ≤ 4.0V, dropout voltage limits are linearly interpolated from the values listed. For VOUT < 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 = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) 0 1.0 0.5 2.0 1.5 3.0 2.5 3.5 1.5 2.5 3.02.0 3.5 4.0 4.5 5.0 5.5 OUTPUT VOLTAGE vs. INPUT VOLTAGE M A X 1 8 0 6 t o c0 1 INPUT VOLTAGE (V) O U TP U T V O LT A G E (V ) IOUT = 0mA IOUT = 500mA 6.0 3.25 3.26 3.28 3.27 3.30 3.31 3.29 3.32 0 200 300100 400 500 600 700 800 OUTPUT VOLTAGE vs. LOAD CURRENT M A X 1 8 0 6 t o c0 2 LOAD CURRENT (mA) O U TP U T V O LT A G E (V ) 3.28 3.30 3.29 3.32 3.31 3.33 3.34 -40 10-15 35 60 85 OUTPUT VOLTAGE vs. TEMPERATURE M A X 1 8 0 6 t o c0 3 TEMPERATURE (°C) O U TP U T V O LT A G E (V ) VIN = VOUT + 500mV IOUT = 0 0 100 50 200 150 250 300 350 400 0 200 300100 400 500 600 700 800 DROPOUT VOLTAGE vs. LOAD CURRENT M A X 1 8 0 6 t o c0 4 LOAD CURRENT (mA) D R O P O U T V O LT A G E (m V ) TA = +85°C TA = +25°C TA = -40°C 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 2.0 2.5 3.0 3.5 4.0 4.5 DROPOUT VOLTAGE vs. OUTPUT VOLTAGE M A X 1 8 0 6 t o c0 5 OUTPUT VOLTAGE (V) D R O P O U T V O LT A G E (V ) 0 100 50 150 200 250 300 350 400 450 500 550 600 2.0 3.0 4.0 5.0 6.0 GROUND-PIN CURRENT vs. INPUT VOLTAGE M A X 1 8 0 6 t o c0 6 INPUT VOLTAGE (V) G R O U N D -P IN C U R R EN T (µ A ) 3.52.5 4.5 5.5 IOUT = 0mA IOUT = 500mA

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (MAX1806EUA33, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) 100 200 150 300 250 350 400 450 500 0 200 300100 400 500 600 700 800 GROUND-PIN CURRENT vs. LOAD CURRENT M A X 1 8 0 6 t o c0 7 LOAD CURRENT (A) G R O U N D -P IN C U R R EN T (µ A ) VIN = 5.5V VIN = 3.8V 150 160 180 170 190 200 -40 10-15 35 60 85 GROUND-PIN CURRENT vs. TEMPERATURE M A X 1 8 0 6 t o c0 8 TEMPERATURE (°C) G R O U N D -P IN C U R R EN T (µ A ) VIN = VOUT + 500mV IOUT = 0 -60 0.01 0.1 1 10 100 1000 -50 -40 -30 -20 -10 0 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY M A X 1 8 0 6 t o c0 9 FREQUENCY (kHz) P S R R ( dB ) COUT = 10µF IOUT = 50mA 10 0.001 0.1 1 100 1000 OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY 0.01 0.1 1 M A X 1 8 0 6 t o c1 0 FREQUENCY (kHz) O U TP U T S P EC TR A L N O IS E D EN S IT Y ( µV /√ H z) 10 COUT = 10µF IOUT = 50mA OUTPUT NOISE DC TO 1MHz MAX1806 toc11 20ms/div VOUT 1mV/div VOUT = 3.3V ROUT = 66Ω (50mA) 0.01 0 200100 400 600 800700 REGION OF STABLE COUT ESR vs. LOAD CURRENT 0.1 1 10 100 M A X 1 8 0 6 t o c1 2 FREQUENCY (kHz) R EG IO N O F C O U T ES R 300 500 COUT = 10µF STABLE REGION LOAD-TRANSIENT RESPONSE MAX1806 toc13 10µs/div IOUT 200mA/div VOUT 20mV/div VIN = VOUT + 500mV CIN = 10µF ROUT = 660Ω TO 6.6Ω (5mA TO 500mA)

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX 6 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1, 2 IN Regulator Input. Supply voltage can range from +2.25V to +5.5V. Bypass with a 1µF capacitor to GND (see Capacitor Selection and Regulation Stability). Connect both input pins together externally. 3 POK Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (VOUT) is below the POK threshold. Connect a 100kΩ pullup resistor from POK to OUT. 4 SHDN Active-Low Shutdown Input. A logic low at SHDN reduces supply current to 0.02µA. In shutdown, the POK output is low. Connect SHDN to IN for normal operation. 5 GND 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. 6 SET Voltage-Setting Input. Connect SET to GND for preset output. Connect an external resistive voltage-divider from OUT to SET to set the output voltage between 0.8V and 4.5V. The SET regulation voltage is 800mV. 7, 8 OUT Regulator Output. OUT sources up to 500mA. Bypass OUT with a 10µF low-ESR capacitor to GND. Connect both OUT pins together externally. LINE-TRANSIENT RESPONSE MAX1806 toc15 200µs/div VIN 1V/div 6V 3V VOUT 10mV/div SHUTDOWN WAVEFORM MAX1806 toc16 20µs/div 2V 3V 0 0 VOUT 1V/div ROUT = 6.6Ω (500mA) VSHDN 1V/div Typical Operating Characteristics (continued) (MAX1806EUA33, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE NEAR DROPOUT MAX1806 toc14 10µs/div IOUT 200mA/div VOUT 50mV/div VIN = VOUT + 100mV CIN = 10µF ROUT = 660Ω TO 6.6Ω (5mA TO 500mA) POK WAVEFORM MAX1806 toc17 200µs/div VIN 2V/div VOUT 2V/div 5V 0 0 0 VPOK 2V/div ROUT = 66Ω (50mA)

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX _______________________________________________________________________________________ 7 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 VSET 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 limiter, thermal sensor, and shutdown logic. Internal P-Channel Pass Transistor The MAX1806 features a 0.4Ω 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 25kΩ to 100kΩ range. Calculate R1 with the follow- ing equation: R1 = R2 [(VOUT / VSET) - 1] where VSET = 0.8V, and VOUT 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 current drops to 0.02µA. When in shutdown, POK pulls low. The capacitance and load at OUT determine the rate at which VOUT decays. SHDN can be pulled as high as +6V, regardless of the input and output voltage. Power-OK Output The POK output pulls 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 100kΩ resistor works well for most applications. POK can be used to signal a microcon- troller (µC), 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- tor’s 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 TJ = +150°C. Operating Region and Power Dissipation The MAX1806’s maximum power dissipation depends on the 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 P = IOUT ✕ (VIN - VOUT). The maximum allowed power dissipation is 1.3W or: PMAX = (TJ(MAX) - TA) / (θJC + θCA) where TJ - TA is the temperature difference between the MAX1806 die junction and the surrounding air, θJC is the thermal resistance from the junction to the case, and θCA 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-

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX 8 _______________________________________________________________________________________ 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 within the limits outlined. Applications Information Capacitor Selection and Regulator Stability Connect a 1µF capacitor between IN and ground and a 10µF 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 capacitor’s (COUT) ESR affects stability and output noise. Use output capacitors with an ESR of 0.1Ω 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 10µF. Connect CIN and COUT 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 80mV SHDN IN IN POK ON OFF CIN 1µF OUT OUT COUT 10µF THERMAL SENSOR VOUT 0.8V TO 3.3V SET MOSFET DRIVER WITH ILIM SHUTDOWN LOGIC VREF 0.8V VIN +2.25V TO +5.5V ERROR AMPLIFIER GND RPOK 100kΩ LOGIC SUPPLY VOLTAGE (VOUT) 93% VREF TO µC MAX1806 PRESET MODE Figure 1. Functional Diagram

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M A X 1 8 0 6 500mA, Low-Voltage Linear Regulator in µMAX _______________________________________________________________________________________ 9 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) ✕ IOUT Chip Information TRANSISTOR COUNT: 949 OUT OUT SET GND IN IN SHDN POK COUT 10µF VOUT VOUT CIN 1µF ON OFF R2 R1 = R2 - 1 0.8V MAX1806 R1 VIN +2.25V TO +5.5V Figure 2. Adjustable Output Using External Feedback Resistors Figure 3. Power Operating Regions: Maximum Output Current vs. Supply Voltage 0 0.2 0.1 0.3 0.6 0.7 0.5 0.4 0.8 0 1.0 1.5 2.0 2.50.5 3.0 3.5 4.0 4.5 5.0 INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V) M A X IM U M O U TP U T C U R R EN T (A ) POWER-µMAX PACKAGE OPERATING REGION AT TJ(MAX) = +150°C TA = +85°C TA = +70°C TA = +50°C CONTINUOUS CURRENT LIMIT TYPICAL VDROPOUT LIMIT

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hotMAX1806EUA15+ MAX1709ESE+ Maxim Integrated, IC REG BST ADJ/PROG 7.5A 16SOIC, 16-SOIC (0.154", 3.90mm Width), - View
hotMAX1806EUA15+ MAX15004AAUE+T Maxim Integrated, IC REG CTRLR MULT TOP 16TSSOP, 16-TSSOP (0.173", 4.40mm Width) Exposed Pad, - View
hotMAX1806EUA15+ MAX16814BUTP+ Maxim Integrated, IC LED DRIVER CTRLR DIM 20TQFN, 20-WFQFN Exposed Pad, - View
hotMAX1806EUA15+ MAX16802BEUA+ Maxim Integrated, IC LED DRIVER OFFLINE DIM 8UMAX, 8-TSSOP, 8-MSOP (0.118", 3.00mm Width), - View
hotMAX1806EUA15+ MAX14544ETA+T Maxim Integrated, IC ACCY SWITCH OVP PROTECT 8TDFN, 8-WFDFN Exposed Pad, - View
hotMAX1806EUA15+ MAX358CWE+T Maxim Integrated, IC MULTIPLEXER 8X1 16SOIC, 16-SOIC (0.295", 7.50mm Width), - View
hotMAX1806EUA15+ MAX32630IWG+T Maxim Integrated, IC MCU 32BIT 2MB FLASH 100WLP, 100-WFBGA, WLBGA, - View

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