MAX1818EUT18+T

Click here for production status of specific part numbers. MAX1818 500mA Low-Dropout Linear Regulator in SOT23 General Description The MAX1818 low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 500mA load current with low 120mV dropout. The highaccuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide) or can be adjusted from 1.25V to 5.0V with an external resistive divider. An internal PMOS pass transistor allows the low 125μA supply current to remain independent of load, making this device ideal for portable battery-operated equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, base stations, and notebook computers. Other features include an active-low open-drain reset output that indicates when the output is out of regulation, a 0.1μA shutdown, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 800mW 6-pin SOT23 package. Applications ●● ●● ●● ●● ●● ●● ●● Notebook Computers Cellular and Cordless Telephones Personal Digital Assistants (PDAs) Palmtop Computers Base Stations USB Hubs Docking Stations Features ●● Guaranteed 500mA Output Current ●● Low 120mV Dropout at 500mA ●● ±1% Output Voltage Accuracy • Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V, 5V • Adjustable from 1.25V to 5.0V ●● Power OK Output ●● Low 125μA Ground Current ●● 0.1μA Shutdown Current ●● Thermal Overload Protection ●● Output Current Limit ●● Tiny 800mW 6-Pin SOT23 Package Ordering Information PART* TEMP RANGE PIN-PACKAGE MAX1818EUT_ _+T -40°C to +85°C 6 SOT23-6 *Insert the desired two-digit suffix (see Selector Guide) into the blanks to complete the part number. Note: The MAX1818 requires a special solder temperature profile described in the Absolute Maximum Ratings section. T = Tape and reel. #Denotes an RoHS-compliant package. Selector Guide appears at end of data sheet. Pin Configuration Typical Operating Circuit VIN = 2.5V TO 5.5V TOP VIEW IN 1 POK 2 6 MAX1818 SHDN 3 19-1860; Rev 3; 8/18 5 SET GND VOUT OUT COUT 3.3µF CIN 1µF MAX1818 4 SOT23 OUT IN NC ON OFF RPOK 100k SHDN POK SET GND TO µC MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Absolute Maximum Ratings IN, SHDN, POK, SET to GND..................................-0.3V to +6V OUT to GND................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration............................................... 1min Continuous Power Dissipation (TA = +70°C) (Note 1) 6-Pin SOT23 (derate 10mW/°C above +70°C)............800mW Operating Temperature Range............................ -40°C to +85°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +150°C Lead Temperature (soldering, 10s) (Note 2).................... +300°C Note 1: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air. With minimal copper, the SOT23 package dissipates 712mW at +70°C. With a quarter square inch of copper, it will dissipate 790mW at +70°C. Copper should be equally shared between the IN, OUT, and GND pins. Note 2: This device is constructed using a unique set of packaging techniques that imposes a limit on the thermal profile to which the device can be exposed during board-level solder attach and rework. The limit permits only the use of the solder profiles recommended in the industry standard specification, IPC JEDEC-J-STD-020A, paragraph 7.6, Table 3 for the IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed. 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 = VOUT + 500mV or VIN = +2.5V, whichever is greater; SHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER Input Voltage Input Undervoltage Lock-Out Output Voltage Accuracy (Preset Mode) SYMBOL VIN VUVLO VOUT CONDITIONS MIN 2.5 -1.5 +1.5 -2.5 +2.5 -3 +3 1.25 5 IOUT = 100mA, TA = -40°C to +85°C VIN = 2.7V, IOUT = 100mA, VOUT set to 2.0V Guaranteed Output Current (RMS) IOUT VIN ≥ 2.7V 500 Short-Circuit Current Limit ILIM VOUT = 0, VIN ≥ 2.7V 0.55 Ground-Pin Current Dropout Voltage (Note 4) Line Regulation IQ TA = 0°C to +85°C 1.225 TA = -40°C to +85°C 1.213 VOUT > 96% of nominal value, VIN ≥ 2.7V VSET = 1.25V IOUT = 500mA 1.250 1.275 1.288 50 0.8 100 -100 125 150 mV +100 nA A 250 100 220 120 215 VOUT = 2.5V 210 360 0 +0.15 -0.15 V A VOUT = 5V VIN from (VOUT + 100mV) to 5.5V, ILOAD = 5mA V 1.8 140 VOUT = 3.3V % mA 1.6 IOUT = 100µA VIN - VOUT IOUT = 500mA ∆VLNR V +1 VSET ISET V 2.3 -1 SET Voltage Threshold (Adjustable Mode) SET Input Bias Current 5.5 IOUT = 100mA, TA = +25°C, VOUT ≥ 2.0V IOUT = 1mA to 500mA, VIN > VOUT + 0.5V, TA = -40°C to +85°C SET Dual Mode™ Threshold UNITS 2.0 IOUT = 100mA, VOUT < 2.0V 2.15 MAX Rising, 75mV hysteresis Adjustable Output Voltage Range In-Regulation Current Limit TYP µA mV %/V Dual Mode is a trademark of Maxim Integrated Products www.maximintegrated.com Maxim Integrated │  2 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Electrical Characteristics (continued) (VIN = VOUT + 500mV or VIN = +2.5V, whichever is greater; SHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL Load Regulation ∆VLDR Output Voltage Noise IOFF SHDN = GND, VIN = 5.5V VIH 2.5V < VIN < 5.5V VIL 2.5V < VIN < 5.5V SHDN Input Threshold SHDN Input Bias Current MIN 10Hz to 1MHz, COUT = 3.3µF (ESR < 0.1Ω) SHUTDOWN Shutdown Supply Current CONDITIONS IOUT = 1mA to 500mA ISHDN TYP MAX 0.4 1.0 115 UNITS % µVRMS 0.1 15 µA 1.6 V 0.6 SHDN = IN or GND, TA = +25°C 1 TA = +85°C 5 25 nA POK OUTPUT POK Output Low Voltage VOL POK sinking 1mA Operating Voltage Range for Valid POK 0.01 POK sinking 100µA 1.0 POK Output High Leakage Current POK = 5.5V, TA = +25°C 1 POK Threshold Rising edge, referred to VOUT(NOMINAL) TA = +85°C THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis 0.1 V 5.5 V 25 nA 5 90 93 TSHDN ∆TSHDN 96 % 170 °C 20 °C Note 3: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Note 4: The Dropout Voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN = VOUT(NOM) + 500mV. Since the minimum input voltage is 2.5V, this specification is only meaningful when VOUT(NOM) > 2.5V. For VOUT(NOM) between 2.5V and 3.5V, use the following equations: Typical Dropout = -93mV/V x VOUT(NOM) + 445mV; Guaranteed Maximum Dropout = -137mV/V x VOUT(NOM) +7004mV. For VOUT(NOM) > 3.5V, Typical Dropout = 120mV; Maximum Dropout = 220mV. Typical Operating Characteristics (VIN = (VOUT + 500mV) or +2.5V, whichever is greater; SHDN = IN, CIN = 1μF, COUT = 3.3μF, TA = +25°C, unless otherwise noted.) 175 150 125 3.3V OUTPUT 1.8V OUTPUT 100 2.5V OUTPUT 75 50 130 2.5V OUTPUT 115 1.8V OUTPUT 3.3V OUTPUT 100 85 70 55 25 0 145 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) www.maximintegrated.com 40 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (A) 170 MAX1818 toc03 200 160 GROUND PIN CURRENT (µA) ILOAD = 150mA GROUND PIN CURRENT vs. TEMPERATURE MAX1818 toc02 GROUND PIN CURRENT (µA) 225 GROUND PIN CURRENT (µA) 250 GROUND PIN CURRENT vs. LOAD CURRENT MAX1818 toc01 GROUND PIN CURRENT vs. INPUT VOLTAGE ILOAD = 150mA 160 5.0V OUTPUT 150 140 1.5V OUTPUT 130 120 110 -40 -15 10 35 60 85 TEMPERATURE (°C) Maxim Integrated │  3 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Typical Operating Characteristics (continued) (VIN = (VOUT + 500mV) or +2.5V, whichever is greater; SHDN = IN, CIN = 1μF, COUT = 3.3μF, TA = +25°C, unless otherwise noted.) 120 TA = +25°C 60 TA = -40°C 30 80 0 0.1 0.2 0.3 0.5 3.3V OUTPUT 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 2.5V OUTPUT 1.8V OUTPUT 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (A) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY LINE TRANSIENT 70 COUT = 3.3µF 60 VOUT = 3.3V VOUT = 1.5V TO 5.0V MAX1818 toc06 3.0 2.5 ILOAD = 150mA 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -40 -15 10 35 60 85 LOAD-TRANSIENT RESPONSE MAX1818 toc08 RLOAD = 100Ω 50 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE TEMPERATURE (°C) VOUT MAX1818 toc09 VIN = 3.3V VOUT = 2.5V IOUT 500mA 100mA 3.5V 500mV/div 30 VIN 20 10 0 0.01 0.1 1 10 100 20mV/div 40 VOUT 100µs/div 1000 40µs/div FREQUENCY (kHz) LOAD-TRANSIENT RESPONSE NEAR DROPOUT POWER-ON RESET MAX1818 toc10 VOUT 100mV/div VIN = VOUT + 100mV VOUT = 3.3V MAX1818 toc11 VPOK 0 VOUT 200mA IOUT PSRR (dB) 0.4 1.0 LOAD CURRENT (A) MAX1818 toc07 0 2.0 1.5 2.5V 10mV/div 90 3.0 2.5 OUTPUT VOLTAGE ACCURACY (%) TA = +85°C 150 OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT MAX1818 toc05 VOUT = 3.3V OUTPUT VOLTAGE ACCURACY (%) DROPOUT VOLTAGE (mV) 180 MAX1818 toc04 DROPOUT VOLTAGE vs. LOAD CURRENT 2V/div 0 VIN 0 0 10µs/div www.maximintegrated.com 10ms/div Maxim Integrated │  4 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Typical Operating Characteristics (continued) (VIN = (VOUT + 500mV) or +2.5V, whichever is greater; SHDN = IN, CIN = 1μF, COUT = 3.3μF, TA = +25°C, unless otherwise noted.) MAX1818 toc12 0 VOUT 0 2V/div 0 POK 200µs/div SHORT-CIRCUIT CURRENT LIMIT (A) SHUTDOWN VOLTAGE 1.11 MAX1818 toc13 SHORT-CIRCUIT CURRENT LIMIT vs. SUPPLY VOLTAGE SHUTDOWN WAVEFORM VOUT(NOM) = +2V 1.10 1.09 1.08 1.07 1.06 1.05 1.04 1.03 1.02 1.01 1.00 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) Pin Description PIN NAME FUNCTION 1 IN Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1µF capacitor to GND (see Capacitor Selection and Regulator Stability). 2 POK Open-Drain POK Output. POK remains low while the output voltage (VOUT) is below the POK threshold. Connect a 100kΩ pull-up resistor from POK to OUT to obtain an output voltage. 3 SHDN 4 GND Ground 5 SET Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive voltage-divider between OUT and GND to set the output voltage between 1.25V and 5.0V. 6 OUT Regulator Output. Sources up to 500mA. Bypass with a 3.3µF low-ESR capacitor to GND. Use a 4.7µF capacitor for output voltages below 2V. Active-Low Shutdown Input. A logic low reduces supply current below 15µA. In shutdown, the POK output is low, and OUT is high impedance. Connect to IN for normal operation. Detailed Description The MAX1818 is a low-dropout, low-quiescent-current linear regulator designed primarily for battery-powered applications. The device supplies loads up to 500mA and is available with preset output voltages. As illustrated in Figure 1, the MAX1818 consists of a 1.25V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The 1.25V reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate www.maximintegrated.com is pulled lower, which allows more current to pass to the output and increases 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 resistive divider connected to OUT or an external resistor network connected to SET. The Dual Mode comparator examines VSET and selects the feedback path. If VSET is below 50mV, the internal feedback path is used and the output is regulated to the factory-preset voltage. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Maxim Integrated │  5 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 VIN = 2.5V TO 5.5V IN CIN 1µF THERMAL SENSOR MOSFET DRIVER WITH ILIM OUT ON VOUT = 1.25V TO 5.0V SHDN OFF COUT 3.3µF SHUTDOWN LOGIC 5k VREF 1.25V ERROR AMPLIFIER LOGIC SUPPLY VOLTAGE (VOUT) RPOK 100k TO µC R1 MAX1818 POK SET 93% VREF R2 100mV GND Figure 1. Functional Diagram Internal P-Channel Pass Transistor The MAX1818 features a 0.25Ω P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX1818 does not suffer from these problems and consumes only 125μA of quiescent current under heavy loads as well as in dropout. Output Voltage Selection The MAX1818’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 voltage. The two-digit part number suffix identifies the output voltage (see Selector Guide). For example, the MAX1818EUT33 has a preset 3.3V output voltage. www.maximintegrated.com The output voltage may also be adjusted by connecting a voltage-divider from OUT to SET to GND (Figure 2). Select R2 in the 25kΩ to 100kΩ range. Calculate R1 with the following equation: R1 = R2 [(VOUT / VSET) – 1] where VSET = 1.25V, and VOUT may range from 1.25V to 5.0V. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input and supply current drops to 0.1μA. When in shutdown, POK pulls low and OUT is high impedance. 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. Maxim Integrated │  6 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 CIN 1µF OUT COUT 3.3µF MAX1818 1.25V VOUT R1 ON SHDN SET OFF R2 POK GND 600 TA = +85°C TA = +70°C MAXIMUM RECOMMENDED OUTPUT CURRENT 400 VOUT = 1.8V 200 0 VOUT = 2.5V 2.5 3.0 3.5 4.0 VOUT = 3.3V 4.5 5.0 MAX1818 fig03 IN MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) -1 MAXIMUM INPUT VOLTAGE VIN = 2.5V TO 5.5V VOUT MAXIMUM OUTPUT CURRENT (mA) R1 = R2 5.5 6.0 INPUT VOLTAGE (V) Figure 2. Adjustable Output Using External Feedback Resistors Figure 3. Power Operating Regions: Maximum Output vs. Supply Voltage POK Output cools by 20°C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection protects the MAX1818 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C. The power OK (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 impedance. POK is an open-drain N-channel output. To obtain a voltage output, connect a pullup resistor from POK to OUT. A 100kΩ resistor works well for most applications. POK can be used as a power-okay (POK) signal to a microcontroller (μC), or drive an external LED to indicate power failure. When the MAX1818 is shut down, POK is held low independent of the output voltage. If unused, leave POK grounded or unconnected. Current Limit The MAX1818 monitors and controls the pass transistor’s gate voltage, limiting the output current to 0.8A (typ). This current limit doubles when the output voltage is within 4% of the nominal value to improve performance with large load transients. Thermal Overload Protection Thermal overload protection limits total power dissipation in the MAX1818. When the junction temperature exceeds TJ = +170°C, a thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature www.maximintegrated.com Operating Region and Power Dissipation The MAX1818’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 800mW at TA = +70°C or: PMAX = (TJ(MAX) - TA) / ( θJC + θCA) where TJ - TA is the temperature difference between the MAX1818 die junction and the surrounding air, θJC is the thermal resistance of the junction to the case, and θCA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. For best heatsinking, the copper area should be equally shared between the IN, OUT, and GND pins. The MAX1818 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 inputoutput differential voltages are low, as shown in Figure 3. Maxim Integrated │  7 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the MAX1818’s input and output for stable operation over the full temperature range and with load currents up to 500mA. Connect a 1μF capacitor between IN and ground and a 3.3μF low-ESR capacitor between OUT and ground. For output voltages less than 2V, use a 4.7μF low-ESR output capacitor. The input capacitor (CIN) lowers the source impedance of the input supply. Reduce noise and improve load-transient response, stability, and powersupply rejection by using larger output capacitors, such as 10μF. The output capacitor’s (COUT) equivalent series resistance (ESR) affects stability and output noise. Use output capacitors with an ESR of 0.1Ω or less to ensure stability and optimum transient response. Surfacemount ceramic capacitors have very low ESR and are commonly available in values up to 10μF. Connect CIN and COUT as close to the MAX1818 as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response The MAX1818 load-transient response (see Typical Operating Characteristics) shows 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 response for a step change in the load current from 100mA to 500mA is 8mV. 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 differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1818 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 IOUT The MAX1818 ground current remains below 150μA in dropout. The MAX1818 is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of power-supply rejection ratio (PSRR) versus frequency. 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. Chip Information Selector Guide Package Information VOUT SOT23 TOP MARK SOT23 TOP MARK (RoHS COMPLIANT) MAX1818EUT15 1.5V or Adj AASO ABZM MAX1818EUT18 1.8V or Adj AANU ABZG MAX1818EUT20 2.0V or Adj AANV ABZJ MAX1818EUT25 2.5V or Adj AANF ABZK MAX1818EUT33 3.3V or Adj AANG ABZH MAX1818EUT50 5.0V or Adj AANH ABZL PART AND SUFFIX www.maximintegrated.com TRANSISTOR COUNT: 845 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 TYPE PACKAGE CODE OUTLINE NO. 6 SOT23 U6F-6 21-0058 6 SOT23# U6FH-6 21-0058 Maxim Integrated │  8 MAX1818 500mA Low-Dropout Linear Regulator in SOT23 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 2 6/08 Updated Ordering Information and Selector Guide with RoHS-compliant package 3 8/18 Updated Ordering Information table 1, 8 1 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. ©  2018 Maxim Integrated Products, Inc. │  9