MAX1793 19-1654 Rev 3 1/12 Low-Dropout, Low I , 1A Linear Regulator Q General Description Features The MAX1793 low-dropout linear regulator (LDO) oper- Guaranteed 1A Output Current ates from +2.5V to +5.5V and delivers a guaranteed 1A Low 210mV Dropout at 1A load current with a low 210mV dropout. The high-accu- racy (1%) output voltage is preset at an internally Up to 1% Output Voltage Accuracy trimmed voltage (see the Ordering Information) or can Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V be adjusted from 1.25V to 5.0V with an external resis- Adjustable from 1.25V to 5.0V tor-divider. Reset Output (4ms Delay) An internal pMOS pass transistor allows a low 125A Low 125A Ground Current supply current, making the MAX1793 ideal for battery- operated portable equipment. Other features include a 0.1A Shutdown built-in reset output, low-power shutdown, and short-cir- Low 115V Output Noise RMS cuit and thermal-overload protection. The MAX1793 is available in a 1.5W, 16-pin power TSSOP package, Thermal-Overload Protection which is 30% smaller than a SOT223 package and only Output Current Limit 1.1mm high. Tiny TSSOP Power Package (1.5W) 30% Smaller than SOT223 (only 1.1mm high) Ordering Information TEMP PIN- V OUT PART RANGE PACKAGE ( V) Applications MAX1793EUE-50 -40 C to +85 C 16 TSSOP-EP* 5.0 or Adj Notebook Computers MAX1793EUE-33 -40 C to +85 C 16 TSSOP-EP* 3.3 or Adj Cordless Telephones 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. Handheld Instruments Contact factory for other preset output voltages. /V Denotes an automotive qualified part. PDAs and Palmtop Computers Note: Devices are also available in a lead(Pb)-free/RoHS- compliant package. Specify lead-free by adding + to the part number when ordering. Typical Operating Circuit Pin Configuration TOP VIEW IN OUT N.C. 1 16 N.C. NC IN 2 15 OUT IN OUT OUT MAX1793 IN IN 3 14 OUT IN OUT C C IN OUT IN 4 MAX1793 13 OUT IN OUT IN 5 12 OUT ON SHDN RST RST 6 11 SET OFF RESET SET SHDN 7 10 GND OUTPUT N.C. 8 9 N.C. EP GND TSSOP Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Dropout, Low I , 1A Linear Regulator Q ABSOLUTE MAXIMUM RATINGS Storage Temperature Range .............................-65C to +150C IN, SHDN, RST to GND ............................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C OUT, SET to GND ........................................-0.3V to (V + 0.3V) IN Output Short-Circuit Duration ............................................Infinite Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) A TSSOP-EP (derate 19mW/C above +70C).....................1.5W Lead(Pb)-Free Packages..............................................+260C Operating Temperature Range ...........................-40C to +85C Packages Containing Lead(Pb)....................................+240C Junction Temperature......................................................+150C 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 = V + 0.5V or V = 2.5V (whichever is greater), SHDN = IN, T = +0C to +85C, unless otherwise noted. Typical values IN OUT(NOM) IN A are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage V 2.5 5.5 V IN Input Undervoltage Lockout V 2.0 2.3 V IN Preset V 2.5V -1 +1 T = +85C, OUT A I = 250mA OUT Preset V < 2.5V -1.5 +1.5 OUT Output Voltage Accuracy T = 0C to +85C, I = 250mA -2 +2 % A OUT (Preset Mode, SET = GND) T = 0C to +85C, I = 1mA to 1A, A OUT -3 +3 V > V + 0.5V IN OUT T = +85C, I = 250mA, V = 3V 1.229 1.250 1.271 A OUT IN SET Voltage Threshold T = 0C to +85C, I = 250mA, V = 3V 1.219 1.281 V A OUT IN (For Adjustable Output) T = 0C to + 85C , I = 1mA to 1A, V = 3V 1.212 1.288 A OUT IN Adjustable Output Voltage 1.25 5 V Range Maximum Output Current I Continuous, V 3V 1 A OUT IN RMS Short-Circuit Current Limit I V = 0V, V 3V 1.1 1.8 3.3 A LIM OUT IN V within 4% of nominal output voltage, OUT In-Regulation Current Limit 2.8 A V = 5.5V IN SET Pin Dual Mode Threshold 50 150 mV SET Input Bias Current I V = +1.25V 100 nA SET SET Ground Current I I = 100A 125 200 A GND OUT MAX1793-33, -50 210 350 I = 1A, OUT Dropout Voltage (Note 1) V - V mV IN OUT SET = GND MAX1793-25 270 450 V from (V + 0.1V) to +5.5V, IN OUT Line Regulation V -0.15 0 +0.15 %/V LNR I = 5mA, SET = GND OUT Load Regulation V I = 100A to 1A 0.7 % LDR OUT Output Voltage Noise 10Hz to 1MHz, C = 6.8F (ESR < 0.1) 115 V OUT RMS Shutdown Supply Current I SHDN = GND, V = +5.5V 0.1 16 A OFF IN Output Pulldown Resistance in SHDN = GND 5 k Shutdown 2 MAX1793