TOP VIEW. Maxim Integrated Products 1
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1 ; Rev ; 1/1 5mA, Low-Dropout, General Description The low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 5mA load current with low 12mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed 4.75V or can be adjusted from 1.25V to 5.V with an external resistive divider. An internal PMOS pass transistor allows the low 135µA 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 with a 4.5ms timeout period that indicates when the output is out of regulation, a.1µa shutdown mode, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 8-pin µmax package. For higher power applications, refer to the MAX1792 and MAX1793 data sheets. Applications Notebook Computers Cellular and Cordless Telephones PDAs Palmtop Computers Base Stations USB Hubs Docking Stations Guaranteed 5mA Output Current Low 12mV Dropout at 5mA Up to ±1% Output Voltage Accuracy Preset at 4.75V Adjustable from 1.25V to 5.V Reset Output with 4.5ms Timeout Period Low 135µA Ground Current.1µA Shutdown Current Thermal Overload Protection Output Current Limit Tiny µmax Package Features Ordering Information PART* TEMP. RANGE P-PACKAGE EUA47-4 C to +85 C 8 µmax *Contact factory for other preset output voltages. Typical Operating Circuit Pin Configuration V = +5V V = 4.75V NC TOP VIEW C 1µF C 3.3µF 1 8 ON OFF SHDN RST R RST 1k TO µc RST SHDN SET GND SET GND µmax Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at , or visit Maxim s website at
2 5mA, Low-Dropout, ABSOLUTE MAXIMUM RATGS, SHDN, RST, SET to GND...-.3V to +6V to GND...-.3V to (V +.3V) Output Short-Circuit Duration...Indefinite Continuous Power Dissipation (T A = +7 C) 8-Pin µmax (derate 4.5mW/ C above +7 C)...362mW Operating Temperature Range...-4 C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s)...+3 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. ELECTRICAL CHARACTERISTICS (V = +5.25V, V = 4.75V, SHDN =, SET = GND, T A = C to +85 C, unless otherwise noted. Typical values are at T A = +25 C.) PARAMETER SYMBOL CONDITIONS M TYP MAX UNITS Input Voltage V V Input Undervoltage Lockout V UVLO Rising, 75mV hysteresis V Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage Range V I = 1mA, V 2.5V T A = +85 C V < 2.5V I = 1mA, T A = C to +85 C I = 1mA to 5mA, V > V +.5V, T A = C to +85 C V SET = 1.25V V % % SET Voltage Threshold (Adjustable Mode) V SET V = +2.7V, T A = +85 C V set to 2.V, I = 1mA T A = C to +85 C V Maximum Output Current I V 2.7V 5 ma RMS Short-Circuit Current Limit I LIM V =, V 2.7V A In-Regulation Current Limit V > 96% of nominal value, V 2.7V 2. A SET Dual Mode Threshold mv SET Input Bias Current I SET V SET = 1.25V na I = 1mA Ground-Pin Current I Q I = 5mA 175 Dropout Voltage (Note 1) V - V I = 5mA mv Line Regulation V LNR V from (V + 1mV) to 5.5V, I LOAD = 5mA 2 µa %/V Load Regulation V LDR I = 1mA to 5mA.4 1. % Output Voltage Noise 1Hz to 1MHz, C = 3.3µF (ESR <.1Ω) 115 µv RMS SHUTDOWN Shutdown Supply Current I OFF SHDN = GND, V = 5.5V.1 15 µa SHDN Input Threshold V IH 2.5V < V < 5.5V 1.6 V IL 2.5V < V < 5.5V.6 SHDN Input Bias Current SHDN = or GND 1 1 na Dual Mode is a trademark of Maxim Integrated Products. V
3 5mA, Low-Dropout, ELECTRICAL CHARACTERISTICS (continued) ((V = +5.25V, V = 4.75V, SHDN =, SET = GND, T A = C to +85 C, unless otherwise noted. Typical values are at T A = +25 C.) RESET PUT PARAMETER SYMBOL CONDITIONS M TYP MAX UNITS Reset Output Low Voltage V OL RST sinking 1mA.1.1 V Operating Voltage Range for Valid Reset RST Output High Leakage Current RST sinking 1µA V V RST = +5.5V 1 na RST Threshold Rising edge, referred to V (NOMAL) % RST Release Delay t RP Rising edge of to rising edge of RST ms THERMAL PROTECTION Ther m al S hutd ow n Tem p er atur e T SHDN 17 C Thermal Shutdown Hysteresis T SHDN 2 C ELECTRICAL CHARACTERISTICS (V = +5.25V, V = 4.75V, SHDN =, SET = GND, T A = -4 C to +85 C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS M MAX UNITS Input Voltage V V Input Undervoltage Lockout V UVLO Rising or falling V Output Voltage Accuracy (Preset Mode) V I = 1mA to 5mA % Adjustable Output Voltage Range SET Voltage Threshold (Adjustable Mode) V SET = 1.25V V V SET I = 1mA V Maximum Output Current I 5 ma RMS Short-Circuit Current Limit I LIM V = A SET Dual Mode Threshold 5 15 mv SET Input Bias Current I SET V SET = 1.25V na Ground-Pin Current I Q I = 1mA 25 µa Dropout Voltage (Note 1) V - V I = 5mA 175 mv Line Regulation V LNR V from (V + 1mV) to 5.5V, I LOAD = 5mA %/V Load Regulation V LDR I = 1mA to 5mA 1. % SHUTDOWN Shutdown Supply Current I OFF SHDN = GND, V = +5.5V 15 µa SHDN Input V IH 2.5V < V < 5.5V 1.6 Threshold V IL 2.5V < V < 5.5V.6 SHDN Input Bias Current SHDN = or GND 1 na V 3
4 5mA, Low-Dropout, ELECTRICAL CHARACTERISTICS (continued) (V = +5.25V, V = 4.75V, SHDN =, SET = GND, T A = -4 C to +85 C, unless otherwise noted.) (Note 2) RESET PUT PARAMETER SYMBOL CONDITIONS M MAX UNITS Reset Output Low Voltage V OL RST sinking 1mA.1 V Operating Voltage Range for Valid Reset RST Output High Leakage Current RST sinking 1µA V V RST = +5.5V 1 na RST Threshold Rising edge, referred to V (NOMAL) % RST Release Delay t RP Rising edge of to rising edge of RST ms Note 1: Dropout voltage is defined as V - V, when V is 1mV below the value of V measured when V = V (NOM) +.5V. Since the minimum input voltage is 2.5V, this specification is only meaningful when V (NOM) 2.5V. For V (NOM) between 2.5V and 3.5V, use the following equations: Typical Dropout = -93mV/V V (NOM) + 445mV; Guaranteed Maximum Dropout = -137mV/V V (NOM) + 74mV. For V (NOM) 3.5V: Typical Dropout = 12mV; Guaranteed Maximum Dropout = 175mV. Note 2: Specifications to -4 C are guaranteed by design, not production tested. Typical Operating Characteristics (V = +5.25V, V = 4.75V, SHDN =, SET = GND, C = 1µF, C = 3.3µF, T A = +25 C, unless otherwise noted.) PUT VOLTAGE (V) PUT VOLTAGE vs. PUT CURRENT V = 5.V V = 5.25V toc1 PUT VOLTAGE (V) PUT VOLTAGE vs. TEMPERATURE I = ma toc2 DROP VOLTAGE (mv) DROP VOLTAGE vs. PUT CURRENT T A = +25 C T A = +85 C T A = -4 C toc PUT CURRENT (ma) TEMPERATURE ( C) PUT CURRENT (ma) 4
5 5mA, Low-Dropout, Typical Operating Characteristics (continued) (V = +5.25V, V = 4.75V, SHDN =, SET = GND, C = 1µF, C = 3.3µF, T A = +25 C, unless otherwise noted.) PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY C = 3.3µF I = 5mA toc4 4.8V 4.75V 4.7V 6mA 4mA 2mA LOAD-TRANSIENT RESPONSE toc5 A B FREQUENCY (khz) LOAD-TRANSIENT RESPONSE NEAR DROP 1 toc6 1µs/div A: V = 4.75V, 5mV/div B: I = 5mA TO 5mA, 2mA/div V = 5.25V, C = 1µF SWITCHG POWER-SUPPLY RIPPLE REJECTION toc7 4.8V 4.75V A 5.V A 4.7V 4.65V 4mA 2mA B 4.75V B 1µs/div A: V = 4.75V, 5mV/div B: I = 5mA TO 5mA, 2mA/div V = V + 1mV = 4.85V, C = 1µF SHUTDOWN WAVEFORM toc8 2µs/div A: MAX1632: V = 9V, V = 5.V, 2mV/div B: : V = 4.75V, I = 5mA, 2mV/div MAX1632 = RST WAVEFORM toc9 2V 1V A A 6V B 4V 2V B C 4µs/div A: V SHDN = TO 2V, 1V/div B: V = 4.75V, 2V/div R = 9.5Ω (5mA) 2ms/div A: V = TO 5.5V, 2V/div B: V = 4.75V, R = 95Ω, 2V/div C: V RST, 1kΩ TO, 2V/div 5
6 5mA, Low-Dropout, P NAME FUNCTION 1, 2 3 RST Pin Description Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with a 1µF capacitor or greater to GND (see Capacitor Selection and Regulator Stability). Connect both input pins together externally. Open-Drain, Active-Low Reset Output. RST remains low while the output voltage (V ) is below the reset threshold and for at least 4ms after V rises above the reset threshold. Connect a 1kΩ pullup resistor to. 4 SHDN Active-Low Shutdown Input. A logic low reduces supply current to.1µa. In shutdown, the RST output is low and is pulled low through an internal 5kΩ resistor. Connect to for normal operation. 5 GND Ground 6 SET 7, 8 Voltage-Setting Input. Connect to GND for preset output. Connect a resistive voltage-divider from to set the output voltage between 1.25V and 5.V. Regulator Output. Sources up to 5mA. Bypass with a 3.3µF low-esr capacitor to GND. Use a 4.7µF capacitor for output voltages below 2V. Connect both output pins together. V = +2.5V TO +5.5V C 1µF THERMAL SENSOR MOSFET DRIVER WITH ILIM V = 1.25V TO 5.V ON OFF SHDN SHUTDOWN LOGIC V REF 1.25V 5kΩ C 3.3µF LOGIC SUPPLY VOLTAGE (V ) ERROR AMPLIFIER R1 R RST 1kΩ TO µc RST SET DELAY TIMER 86% V REF 1mV GND R2 Figure 1. Functional Diagram 6
7 5mA, Low-Dropout, Detailed Description The is a low-dropout, low-quiescent-current ripple rejector designed primarily for audio and video applications. The device supplies loads up to 5mA and is available with a preset output voltage of 4.75V. As shown in Figure 1, the 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 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 passtransistor 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 or an external resistor network connected to SET. The dual-mode comparator examines V SET and selects the feedback path. If V SET is below 5mV, the internal feedback path is used and the output is regulated to the factory-preset voltage. Additional blocks include an output current limiter, reset comparator, thermal sensor, and shutdown logic. Internal P-Channel Pass Transistor The features a.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 does not suffer from these problems and consumes only 175µA of quiescent current under heavy loads as well as in dropout. Output Voltage Selection The 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 EUA47 has a preset 4.75V output voltage. The output voltage may also be adjusted by connecting a voltage-divider from to SET (Figure 2). Select R2 V = +2.5V TO +5.5V ON OFF C 1µF SHDN RST in the 25kΩ to 1kΩ range. Calculate R1 with the following equation: R1 = R2 [(V / V SET ) 1] where V SET = 1.25V, and V may range from 1.25V to 5.V. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input and supply current drops to.1µa. When in shutdown, RST pulls low and is discharged through an internal 5kΩ resistor. The capacitance and load at determine the rate at which V decays. SHDN can be pulled as high as 6V, regardless of the input and output voltage. Reset Output The reset output (RST) pulls low when is less than 86% of the nominal regulation voltage. Once exceeds 86% of the nominal voltage, RST goes high impedance after 4.5ms. RST is an open-drain N-channel output. To obtain a voltage at RST, connect a pullup resistor from RST to. A 1kΩ resistor works well for most applications. RST can be used as a power-on-reset (POR) signal to a microcontroller (µc), or drive an external LED to indicate power failure. When the is SET GND V R1 = R V C 3.3µF Figure 2. Adjustable Output Using External Feedback Resistors R 1 R 2 V 7
8 5mA, Low-Dropout, shut down, RST is held low independent of the output voltage. If unused, leave RST grounded or unconnected. Current Limit The monitors and controls the pass transistor s gate voltage, limiting the output current to 1.2A. This current limit doubles when the output voltage is within 4% of the nominal value to improve performance with large load transients. The output can be shorted to ground for an indefinite period of time without damaging the part. Thermal Overload Protection Thermal overload protection limits total power dissipation in the. When the junction temperature exceeds T J = +17 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 junction temperature cools by 2 C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection protects the in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of T J = +15 C. Operating Region and Power Dissipation The 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 = I x (V - V ). The maximum allowed power dissipation is 33mW or: P MAX = (T J(MAX) - T A ) / ( θ JC + θ CA ) where T J - T A is the temperature difference between the die junction and the surrounding air; θ JC is the thermal resistance from the junction to the case; and θ CA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. The delivers up to.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 voltages are low, as shown in Figure 3. Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the s input and output for stable operation over the full temperature range and with load currents up to 5mA. Connect a 1µF capacitor between and ground and a 3.3µF low MAXIMUM PUT CURRENT (A) CONTUOUS CURRENT LIMIT TYPICAL VDROP LIMIT T A = +85 C T A = +5 C T A = +7 C µmax PACKAGE OPERATG REGION AT T J(MAX) = +15 C PUT-PUT VOLTAGE DIFFERENTIAL (V) MAXIMUM SUPPLY VOLTAGE LIMIT (V = 1.25V) Figure 3. Power Operating Regions: Maximum Output Current vs. Supply Voltage equivalent series resistance (ESR) capacitor between and ground. For output voltages less than 2V, use a 4.7µF low-esr output capacitor. The input capacitor (C ) 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 such as 1µF. The output capacitor s (C ) ESR affects stability and output noise. Use output capacitors with an ESR of.1ω or less to ensure stability and optimum transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 1µF. Connect C and C as close to the as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response The 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) vs. 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. The load-transient response graphs (see Typical Operating Characteristics) show two compo- 8
9 5mA, Low-Dropout, nents 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 5mA to 5mA is 18mV. 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 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-tosource on-resistance (R DS(ON) ) multiplied by the load current (see Typical Operating Characteristics): V DROP = V - V = R DS(ON) x I The ground current remains below 15µA in dropout. TRANSISTOR COUNT: 845 Chip Information 9
10 5mA, Low-Dropout, Package Information 8LUMAXD.EPS 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. 1 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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