MAX1725/MAX1726 12V, Ultra-Low I , Low-Dropout Q Linear Regulators General Description Features The MAX1725/MAX1726 are ultra-low supply current, 2A Supply Current low-dropout linear regulators intended for low-power Reverse-Battery Protection applications that demand the longest possible battery life. Unlike inferior PNP-based designs, the MAX1725/ +2.5V to +12V Input Voltage Range MAX1726s PMOS pass elements maintain an ultra-low Fixed 1.8V, 2.5V, 3.3V, and 5V Output Voltages 2A supply current throughout their entire operating (MAX1726) range and in dropout. Despite their ultra-low power consumption, the MAX1725/MAX1726 have tight output Adjustable 1.5V to 5V Output Voltages (MAX1725) accuracy (1.5%) and require just 1F output capacitance 20mA Guaranteed Output Current to achieve good load-transient response. 1.5% Output Voltage Accuracy These regulators have a wide input voltage range (+2.5V to +12V), making them excellent choices for Small 1F Output Capacitor systems powered from two lithium-ion (Li+) cells and 9V Short-Circuit Protection batteries. Other features include reverse-battery protec- tion, short-circuit protection, and thermal protection. Thermal Protection The MAX1725 provides an adjustable 1.5V to 5V output Tiny 5-Pin SOT23 Package using an external resistor-divider. The MAX1726 pro- vides factory preset 1.8V, 2.5V, 3.3V, or 5V output volt- Ordering Information ages (see the Ordering Information). Both devices are available in a tiny 5-pin SOT23 package. PIN- TOP PART TEMP RANGE PACKAGE MARK Applications MAX1725EUK+T -40C to +85C 5 SOT23 ADNK MAX1726EUK18+T -40C to +85C 5 SOT23 ADNL Smoke Detectors MAX1726EUK25+T -40C to +85C 5 SOT23 ADNM Remote Transmitters MAX1726EUK25/V+T -40C to +85C 5 SOT23 AFMN Smart Battery Packs MAX1726EUK33+T -40C to +85C 5 SOT23 ADNN Industrial Control Systems MAX1726EUK50+T -40C to +85C 5 SOT23 ADNO Microcontroller Power +Denotes a lead(Pb)-free/RoHS-compliant package. Real-Time Clock Backup Power /V denotes an automotive-qualified part. Note: See the Selector Guide for the output options as they relate PDAs and Handy-Terminals to the part number suffix. Battery-Powered Alarms Typical Operating Circuit Selector Guide OUTPUT VOLTAGE PART (V) V OUTPUT IN IN OUT MAX1725EUK+T Adj 1.5 to 5.0 2.5V TO 12V 1.5V TO 5V MAX1726EUK18+T Fixed 1.8 MAX1726EUK25+T Fixed 2.5 MAX1726 MAX1726EUK25/V+T Fixed 2.5 ON MAX1726EUK33+T Fixed 3.3 SHDN GND OFF MAX1726EUK50+T Fixed 5.0 Pin Configuration appears at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct 19-1680 Rev 2 11/12 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX1725/MAX1726 12V, Ultra-Low I , Low-Dropout Q Linear Regulators ABSOLUTE MAXIMUM RATINGS IN to GND................................................................-14V to +14V OUT Short Circuit...........................................................Indefinite SHDN to GND..............................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) IN A (-0.3V to + 0.3V when V < 0V) 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW IN OUT, FB (MAX1725 only) to GND...................-0.3V to +6V when Junction Temperature......................................................+150C V >5.7V -0.3V to (V + 0.3V) when 0V < Operating Temperature Range ...........................-40C to +85C IN IN V < 5.7V -0.3V to +0.3V when V < 0V Storage Temperature Range .............................-65C to +150C IN IN OUT Continuous Current...................................................200mA Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) Junction-to-Ambient Thermal Resistance ( )...............140C/W JA Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, V = V + 1V, SHDN = IN, I = 1mA, T = -40C to +85C, unless otherwise noted. Typical values are at IN OUT OUT A T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V (Note 3) 2.5 12 V IN Supply Current I V = 12V 2 4.5 A IN IN Shutdown Supply Current I V = 0V, V = 12V, V = 0V 0.7 2 A IN(SHDN) SHDN IN OUT OUT Voltage Range V MAX1725 only 1.5 5 V OUT FB Voltage V MAX1725 only (Note 4) 1.245 V FB T = +25C -1.5 1.5 A OUT Voltage Accuracy (Note 4) T = 0C to +85C -2 +2 % A T = -40C to +85C -3 +3 A Line Regulation V V = 2.5V or (V + 0.5V) to 12V 0.01 0.3 %/V LNR IN OUT I = 1mA to 20mA, V = (V + 1V) OUT IN OUT Load Regulation V 0.015 0.15 %/mA LDR or 3V (min) Maximum OUT Current I V = (V + 1V) or 3V (Note 5) 20 80 mA OUT IN OUT I = 20mA for V 2.5V, I = 10mA for OUT OUT OUT Dropout Voltage (Note 5) V 300 600 mV DO V < 2.5V, not applicable for V < 1.9V OUT OUT Foldback Current Limit I V = 12V, V = 0V 40 mA SC IN OUT V 2 IH V = 2.5V to 12V V SHDN Input Threshold IN V 0.5 IL T = +25C -50 +50 A SHDN Input Bias Current I V = 0V to 12V nA SHDN SHDN T = +85C 0.1 A T = +25C -20 2 +20 A FB Input Bias Current I V = 1.25V nA FB FB (MAX1725 only) T = +85C 1.5 A IN Reverse Leakage Current V = -12V, V = 0V 0.01 10 A IN SHDN Thermal-Shutdown Threshold Temperature rising 150 C Thermal-Shutdown Hysteresis 15 C 2 Maxim Integrated