19-1654; Rev 3; 1/12 Low-Dropout, Low IQ, 1A Linear Regulator Features o Guaranteed 1A Output Current o Low 210mV Dropout at 1A o Up to ±1% Output Voltage Accuracy Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V Adjustable from 1.25V to 5.0V o Reset Output (4ms Delay) o Low 125µA Ground Current o 0.1µA Shutdown o Low 115µVRMS Output Noise o Thermal-Overload Protection o Output Current Limit o Tiny TSSOP Power Package (1.5W) 30% Smaller than SOT223 (only 1.1mm high) Ordering Information PART ________________________Applications Notebook Computers Cordless Telephones TEMP RANGE VOUT† (V) PINPACKAGE MAX1793EUE-50 -40°C to +85°C 16 TSSOP-EP* 5.0 or Adj MAX1793EUE-33 -40°C to +85°C 16 TSSOP-EP* 3.3 or Adj MAX1793EUE-33/V -40°C to +85°C 16 TSSOP-EP* 3.3 or Adj Cellular Phones Ordering Information continued at end of data sheet Modems *EP = Exposed pad. †Contact factory for other preset output voltages. Handheld Instruments /V Denotes an automotive qualified part. Note: Devices are also available in a lead(Pb)-free/RoHScompliant package. Specify lead-free by adding “+” to the part number when ordering. PDAs and Palmtop Computers Typical Operating Circuit Pin Configuration TOP VIEW IN NC IN IN CIN OUT MAX1793 OUT IN OUT IN OUT SHDN RST OUT COUT N.C. 1 16 N.C. IN 2 15 OUT IN 3 14 OUT IN 4 ON OFF SET GND RESET OUTPUT MAX1793 13 OUT IN 5 12 OUT RST 6 11 SET SHDN 7 10 GND N.C. 8 EP 9 N.C. TSSOP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX1793 General Description The MAX1793 low-dropout linear regulator (LDO) operates from +2.5V to +5.5V and delivers a guaranteed 1A load current with a low 210mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see the Ordering Information) or can be adjusted from 1.25V to 5.0V with an external resistor-divider. An internal pMOS pass transistor allows a low 125µA supply current, making the MAX1793 ideal for batteryoperated portable equipment. Other features include a built-in reset output, low-power shutdown, and short-circuit and thermal-overload protection. The MAX1793 is available in a 1.5W, 16-pin power TSSOP package, which is 30% smaller than a SOT223 package and only 1.1mm high. MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator ABSOLUTE MAXIMUM RATINGS IN, SHDN, RST to GND ............................................-0.3V to +6V OUT, SET to GND ........................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ............................................Infinite Continuous Power Dissipation (TA = +70°C) TSSOP-EP (derate 19mW/°C above +70°C) .....................1.5W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C Soldering Temperature (reflow) Lead(Pb)-Free Packages..............................................+260°C Packages Containing Lead(Pb)....................................+240°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 (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = +0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) MAX UNITS Input Voltage PARAMETER SYMBOL VIN CONDITIONS 2.5 5.5 V Input Undervoltage Lockout VIN 2.0 2.3 V SET Voltage Threshold (For Adjustable Output) Preset VOUT ≥ 2.5V -1 +1 -1.5 +1.5 TA = 0°C to +85°C, IOUT = 250mA -2 +2 TA = 0°C to +85°C, IOUT = 1mA to 1A, VIN > VOUT + 0.5V -3 +3 TA = +85°C, IOUT = 250mA, VIN = 3V 1.229 TA = 0°C to +85°C, IOUT = 250mA, VIN = 3V 1.219 1.281 TA = 0°C to +85°C, IOUT = 1mA to 1A, VIN = 3V 1.212 1.288 1.25 5 Adjustable Output Voltage Range Maximum Output Current IOUT Continuous, VIN ≥ 3V 1 Short-Circuit Current Limit ILIM VOUT = 0V, VIN ≥ 3V 1.1 VOUT within 4% of nominal output voltage, VIN = 5.5V In-Regulation Current Limit SET Pin Dual Mode Threshold 1.250 ISET VSET = +1.25V Ground Current IGND IOUT = 100µA VIN - VOUT IOUT = 1A, SET = GND % 1.271 V V ARMS 1.8 3.3 2.8 50 SET Input Bias Current Dropout Voltage (Note 1) TYP Preset VOUT < 2.5V TA = +85°C, IOUT = 250mA Output Voltage Accuracy (Preset Mode, SET = GND) MIN A A 150 mV ±100 nA µA 125 200 MAX1793-33, -50 210 350 MAX1793-25 270 450 0 +0.15 mV Line Regulation ∆VLNR VIN from (VOUT + 0.1V) to +5.5V, IOUT = 5mA, SET = GND Load Regulation ∆VLDR IOUT = 100µA to 1A 0.7 % 10Hz to 1MHz, COUT = 6.8µF (ESR < 0.1Ω) 115 µVRMS SHDN = GND, VIN = +5.5V 0.1 Output Voltage Noise Shutdown Supply Current Output Pulldown Resistance in Shutdown 2 IOFF SHDN = GND -0.15 5 _______________________________________________________________________________________ 16 %/V µA kΩ Low-Dropout, Low IQ, 1A Linear Regulator (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = +0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS VIH VIL +2.5V < VIN < +5.5V SHDN Input Bias Current I SHDN SHDN = GND or IN RST Output Low Voltage VOL SHDN Input Threshold MIN TYP MAX 0.01 0.6 1 µA 0.1 V 5.5 V 0.01 1 µA 1.6 ISINK = 1mA UNITS V Operating Voltage Range for RST Valid ISINK = 100µA RST Output High Leakage V RST = +5.5V RST Trip Level Referred to Nominal VOUT Rising edge 90 94 96 % VOUT RST Release Delay Rising edge 1.5 4.0 8.0 ms Thermal Shutdown Temperature T SHDN 1.0 Typical thermal hysteresis = 20°C 170 °C ELECTRICAL CHARACTERISTICS (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) MAX UNITS Input Voltage PARAMETER SYMBOL VIN 2.5 5.5 V Input Undervoltage Lockout VIN 2.0 2.3 V Output Voltage Accuracy (preset mode, SET = GND) SET Voltage Threshold (for adjustable output) CONDITIONS IOUT ILIM -2.5 2.5 IOUT = 1mA to 1A, VIN > VOUT + 0.5V -3.2 3.2 IOUT = 250mA, VIN = 3V 1.216 1.284 IOUT = 1mA to 1A, VIN = 3V 1.210 1.290 1.25 5 Continuous, VIN ≥ 3V VOUT = 0V, VIN ≥ 3V SET Pin Dual Mode Threshold SET Input Bias Current ISET VSET = +1.25V Ground Current IGND IOUT = 100µA Dropout Voltage (Note 1) VIN VOUT IOUT = 1A, SET = GND Line Regulation ∆VLNR VIN from (VOUT + 0.1V) to +5.5V, IOUT = 5mA, SET = GND Shutdown Supply Current SHDN Input Threshold IOFF VIH VIL SHDN Input Bias Current ISH D N RST Output Low Voltage VOL TYP IOUT = 250mA Adjustable Output Voltage Range Maximum Output Current Short-Circuit Current Limit MIN SHDN = GND or IN ISINK = 1mA V V ARMS 1 1.1 3.3 A 50 150 mV ±100 nA 200 µA MAX1793-33, -50 350 MAX1793-25 450 -0.15 SHDN = GND, VIN = +5.5V +2.5V < VIN < +5.5V % mV 0.15 %/V 16 µA 1.6 0.6 V 1 µA 0.1 V _______________________________________________________________________________________ 3 MAX1793 ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS Operating Voltage Range for RST Valid ISINK = 10µA RST Output High Leakage V RST = +5.5V RST Trip Level Referred to Nominal VOUT Rising edge RST Release Delay Rising edge MIN TYP 1.0 MAX UNITS 5.5 V 1 µA 90 96 % VOUT 1.5 8.0 ms Note 1: Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured when VIN = VOUT(NOM) + 0.5V. Since the minimum input voltage is 2.5V, this specification in only meaningful when VOUT(NOM) ≥2.5V. For VOUT(NOM) between 2.5V and 3.3V, use the following equations: Typical Dropout = 210mV + (3.3V - VOUT(NOM) x 75mV/V; Guaranteed Maximum Dropout = 350mV + (3.3V - VOUT(NOM) x 125mV/V. For VOUT(NOM) > 3.3V: Typical Dropout = 210mV; Guaranteed Maximum Dropout = 350mV. Note 2: Specifications to TA = -40°C are guaranteed by design and not production tested. Typical Operating Characteristics (Circuit of Figure 2, VIN = +5V, V SHDN = VIN, VOUT = +3.3V, TA = +25°C, unless otherwise noted.) 3.299 3.297 IOUT = 1A 2.5 2.0 1.5 1.0 IOUT = 250mA 3.315 3.310 3.305 3.300 3.295 3.290 3.285 3.280 0.5 3.275 3.270 0 3.293 1 10 100 0 1000 2 3 4 GROUND CURRENT vs. INPUT VOLTAGE 225 150 IOUT = 0 50 0 175 150 125 100 75 3 INPUT VOLTAGE (V) 4 5 20 40 60 80 IOUT = 250mA 200 190 180 170 160 150 IOUT = 0 140 50 130 25 120 110 0 2 210 GROUND CURRENT (µA) 200 GROUND CURRENT (µA) 200 0 GROUND CURRENT vs. TEMPERATURE GROUND CURRENT vs. LOAD CURRENT MAX1793 toc05 IOUT = 1A 1 -20 TEMPERATURE (°C) 250 MAX1793 toc04 250 0 -40 5 INPUT VOLTAGE (V) LOAD CURRENT (mA) 100 1 MAX1793 toc06 3.295 4 MAX1793 toc03 IOUT = 0 3.0 OUTPUT VOLTAGE (V) 3.301 3.320 MAX1793 toc02 MAX1793 toc01 3.5 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 3.303 OUTPUT VOLTAGE vs. TEMPERATURE OUTPUT VOLTAGE vs. INPUT VOLTAGE OUTPUT VOLTAGE vs. LOAD CURRENT 3.305 GROUND CURRENT (µA) MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator 1 10 100 LOAD CURRENT (mA) 1000 -40 -20 0 20 40 TEMPERATURE (°C) _______________________________________________________________________________________ 60 80 Low-Dropout, Low IQ, 1A Linear Regulator POWER-SUPPLY REJECTION RATIO vs. FREQUENCY IOUT = 250mA 50 PSRR (dB) 150 NOISE (µV/√Hz) 40 200 30 100 20 50 10 10 400 600 0.01 0.01 800 1000 1200 LOAD CURRENT (mA) 0.1 0.1 1 10 100 1000 0.01 0.1 FREQUENCY (kHz) 1 10 100 1000 FREQUENCY (kHz) OUTPUT NOISE vs. LOAD CURRENT LINE-TRANSIENT RESPONSE 140 MAX1793 toc11 MAX1793 toc10 200 120 OUTPUT NOISE (µVRMS) 0 1 IOUT = 250mA 0 0 MAX1793 toc09 250 DROPOUT VOLTAGE (mV) 60 MAX1793 toc07 300 OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY MAX1793 toc08 DROPOUT VOLTAGE vs. LOAD CURRENT 5V VIN 100 3.4V 80 60 VOUT 40 10mV/div AC-COUPLED 20 IOUT = 100mA 0 0.001 0.01 0.1 1 100µs/div LOAD CURRENT (A) LOAD-TRANSIENT RESPONSE OUTPUT NOISE MAX1793 toc12 MAX1793 toc13 1A IOUT 100mA 100µV/div 20mV/div AC-COUPLED VOUT 40µs/div 4ms/div _______________________________________________________________________________________ 5 MAX1793 Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = +5V, V SHDN = VIN, VOUT = +3.3V, TA = +25°C, unless otherwise noted.) MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = +5V, V SHDN = VIN, VOUT = +3.3V, TA = +25°C, unless otherwise noted.) RESET OUTPUT RESPONSE SHUTDOWN RESPONSE MAX1793 toc15 MAX1793 toc14 VOUT VIN 5V/div VOUT 2V/div RST 2V/div 2V/div VSHDN 5V/div IOUT = 100mA 1ms/div 40µs/div Pin Description 6 PIN NAME FUNCTION 1, 8, 9, 16 N.C. 2–5 IN 6 RST Reset Output. Open-drain output is low when VOUT is 6% below its nominal value. RST remains low while the output voltage (VOUT) is below the reset threshold and for at least 4ms after VOUT rises above the reset threshold. Connect a 100kΩ pullup resister to OUT to obtain an output voltage. 7 SHDN Active-Low Shutdown Input. A logic-low disables the output and reduces the supply current to 0.1µA. In shutdown, the RST output is low and OUT is pulled low through an internal 5kΩ resistance. Connect SHDN to IN for normal operation. 10 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. 11 SET Voltage-Setting Input. Connect to GND to select the factory-present output voltage. Connect SET to an external resistor-divider for adjustable-output operation. 12–15 OUT Regulator Output. Bypass with a 6.8µF, low-ESR capacitor to GND. Connect all OUT pins together at the IC. — EP No Connection. Not internally connected. Regulator Input. Supply voltage ranges from +2.5V to +5.5V. Bypass with a 4.7µF capacitor to GND (see the Capacitor Selection and Regulator Stability). These inputs are internally connected, but they also must be externally connected for proper operation. Exposed Pad. Connect to the ground plane. EP also functions as a heatsink. Solder to the circuit-board ground plane to maximize thermal dissipation. _______________________________________________________________________________________ Low-Dropout, Low IQ, 1A Linear Regulator The MAX1793 features Dual Mode™ operation, allowing a fixed output or an adjustable output from +1.25V to +5V. The regulators are guaranteed to supply 1A of output current. As Figure 1 shows, the device consists of a +1.25V reference, error amplifier, MOSFET driver, p-channel pass transistor, internal feedback voltage-divider, Dual Mode comparator, and 4ms reset output. The +1.25V reference is connected to the inverting input of the error amplifier. The error amplifier compares this reference with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the p-channel transistor. If the feedback voltage is lower than the reference, the pass transistor’s gate is pulled lower, allowing more current to pass and increase the output voltage. If the feedback voltage is high, the pass transistor’s gate is pulled up, allowing less current to pass to the output. The low VOUT comparator senses when the feedback voltage has dropped 6% below its expected level, causing RST to go low. The output voltage is fed back through either an internal resistor-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. Dual Mode is a trademark of Maxim Integrated Products, Inc. IN SHUTDOWN THERMAL SENSOR MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT ERROR AMP SHDN PMOS SHUTDOWN LOGIC OUT 94% VOUT DETECTOR 4ms DELAY TIMER IN RST NMOS 1.25V REFERENCE OUT 1175mV 4ms SET R1 MAX1793 DUAL MODE COMPARATOR 100mV R2 GND Figure 1. Functional Diagram _______________________________________________________________________________________ 7 MAX1793 Detailed Description MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Internal p-Channel Pass Transistor Shutdown The MAX1793 features a 1A 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 MAX1793 does not suffer from these problems and consumes only 225µA of quiescent current under heavy loads, as well as in dropout. A logic-low on SHDN disables the MAX1793. In shutdown, the pass transistor, control circuitry, reference, and all internal circuits are turned off, reducing supply current to typically 0.1µA. Connect SHDN to IN for normal operation. In shutdown, RST goes low and OUT is discharged to GND with a 5kΩ internal resistance. Output Voltage Selection The MAX1793 features Dual Mode operation. In preset voltage mode, the output of the MAX1793 is set to an internally trimmed voltage (see the Ordering Information). Select this mode by connecting SET to GND (Figure 2). In adjustable mode, an output is selected between +1.25V and +5V using two external resistors connected as a voltage-divider to SET (Figure 3). The output voltage is determined by the following equation: VOUT = VSET [1 + (R1/R2)] RST Comparator The MAX1793 features a low VOUT indicator that asserts when the output voltage falls out of regulation. The open-drain RST output goes low when OUT falls 6% below its nominal output voltage. RST remains low for 4ms after OUT has returned to its nominal value. A 100kΩ pullup resistor from RST to a suitable logic supply voltage (typically OUT) provides a logic control signal. RST can be used as a power-on-reset (POR) signal to a microcontroller or can drive an external LED to indicate power failure. RST is low during shutdown. Current Limiting R1 = R2 [(VOUT/VSET) – 1] The MAX1793 features a current limit that monitors the pass transistor, typically limiting short-circuit output current to 1.8A. The current limit is increased to approximately 2.8A when the output voltage is in regulation, improving performance with large transient loads. The output can be shorted to ground for an indefinite period of time without damaging the device. Since the input bias current at SET is less than 100nA, large resistance values can be used for R1 and R2 to minimize power consumption without losing efficiency. Up to 125kΩ is acceptable for R2. In preset voltage mode, the impedance from SET to GND should be less than 10kΩ. Otherwise, spurious conditions could cause the voltage at SET to exceed the 50mV dual-mode threshold. Thermal-overload protection limits total power dissipation in the MAX1793. 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 once the IC’s junction temperature drops approximately 20°C. Continuous short-circuit conditions will result in a pulsed output. where VSET = +1.25V. To simplify resistor selection: IN NC IN IN CIN = 4.7µF ON OFF Thermal-Overload Protection IN NC OUT MAX1793 OUT IN OUT IN OUT SHDN RST SET IN IN MAX1793 OUT IN OUT OUT COUT = 6.8µF CIN = 4.7µF ON OFF RESET OUTPUT OUT IN OUT SHDN RST GND SET 8 COUT = 6.8µF R1 RESET OUTPUT R2 GND Figure 2. Typical Operating Circuit with Preset Output Voltage OUT Figure 3. Typical Operating Circuit with Adjustable Output Voltage _______________________________________________________________________________________ Low-Dropout, Low IQ, 1A Linear Regulator PMAX = [(TJ(MAX) – TA)/(θJC + θCA)] 2.0 MAXIMUM CONTINUOUS CURRENT 1.8 1.6 TA = +25°C 1.4 1.2 1.0 0.8 0.6 TA = +50°C 0.4 TA = +70°C 0.2 where (T J(MAX) – T A ) is the temperature difference between the maximum allowed die junction (+150°C) and the surrounding air, θJC (junction-to-case) is the thermal resistance of the package chosen, and θCA is the thermal resistance from the case through the PCB, copper traces, and other materials to the surrounding air. Figure 4 shows allowable power dissipation for typical PCBs at +25°C, +50°C, and +70°C ambient temperatures. The MAX1793 TSSOP-EP package features an exposed thermal pad on its underside. This pad lowers the thermal resistance of the package by providing a direct heat conduction path from the die to the PCB. Additionally, the ground pin (GND) also channels heat. Connect the exposed thermal pad and GND to circuit ground by using a large pad (minimum 1in2 recommended), or multiple vias to the ground plane. Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the input and output of the MAX1793. Connect a 4.7µF capacitor between IN and ground (CIN) and a 6.8µF capacitor between OUT and ground (COUT). CIN serves only to lower the source impedance of the input supply and may be smaller than 4.7µF when the MAX1793 is powered from regulated power supplies or low-impedance batteries. The output capacitor’s equivalent series resistance (ESR) affects stability and output noise. COUT ESR should be 0.5Ω 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 10µF. Other low-ESR (< 0.5Ω) capacitors, such as surface-mount tantalum or OS-CON, may also be used. Connect CIN and COUT as close to the IC as possible to minimize the impact of PCB trace inductance. MAXIMUM SUPPLY VOLTAGE Maximum power dissipation of the MAX1793 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipated by the device is: P = IOUT (VIN – VOUT). The resulting maximum power dissipation is: MAXIMUM OUTPUT CURRENT vs. INPUT-OUTPUT DIFFERENTIAL VOLTAGE MAXIMUM OUTPUT CURRENT (A) Operating Region and Power Dissipation MAX1793 Thermal-overload protection is designed to safeguard the MAX1793 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C. TJ(MAX) = +150°C 0 0 1 2 3 4 5 6 INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V) Figure 4. Power Operating Region: Maximum Output Current vs. Input-Output Differential Voltage Noise, PSRR, and Transient Response The MAX1793 output noise is typically 115µVRMS during normal operation. This is suitably low for most applications. See the output noise plot in the Typical Operating Characteristics. The MAX1793 is designed to achieve low dropout voltage and low quiescent current 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 very noisy sources, supply noise rejection and transient response can be improved by increasing the values of the input and output capacitors and employing passive postfiltering. 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. Since a p-channel MOSFET is used as the pass device, dropout voltage is the product of R DS(ON) and load current (see the Electrical Characteristics and Dropout Voltage vs. Load Current in the Typical Operating Characteristics). The MAX1793 operating current typically remains below 225µA in dropout. _______________________________________________________________________________________ 9 MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Package Information Ordering Information (continued) PART TEMP RANGE PINPACKAGE VOUT† (V) MAX1793EUE-25 -40°C to +85°C 16 TSSOP-EP* 2.5 or Adj MAX1793EUE-20 -40°C to +85°C 16 TSSOP-EP* 2.0 or Adj MAX1793EUE-18 -40°C to +85°C 16 TSSOP-EP* 1.8 or Adj MAX1793EUE-15 -40°C to +85°C 16 TSSOP-EP* 1.5 or Adj *EP = Exposed pad. †Contact factory for other preset output voltages. /V Denotes an automotive qualified part. Note: Devices are also available in a lead(Pb)-free/RoHScompliant package. Specify lead-free by adding “+” to the part number when ordering. 10 For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. LAND PATTERN NO. 16 TSSOP-EP U16E-3 21-0108 90-0120 ______________________________________________________________________________________ Low-Dropout, Low IQ, 1A Linear Regulator REVISION NUMBER REVISION DATE DESCRIPTION 0 8/00 Initial release 1 11/00 Added output voltages and updated Electrical Characteristics. 2 9/09 Added the automotive version of the MAX1793. 3 1/12 Added lead-free options and updated soldering temperature and Pin Description PAGES CHANGED — 1–4, 7–9 1 1, 2, 6, 10 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. 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. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX1793 Revision History