MAX1818 19-1860 Rev 2 6/08 500mA Low-Dropout Linear Regulator in SOT23 General Description Features The MAX1818 low-dropout linear regulator operates Guaranteed 500mA Output Current from a +2.5V to +5.5V supply and delivers a guaran- Low 120mV Dropout at 500mA teed 500mA load current with low 120mV dropout. The high-accuracy (1%) output voltage is preset at an 1% Output Voltage Accuracy internally trimmed voltage (see Selector Guide) or can Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V, 5V be adjusted from 1.25V to 5.0V with an external resis- Adjustable from 1.25V to 5.0V tive divider. Power OK Output An internal PMOS pass transistor allows the low 125A supply current to remain independent of load, making Low 125A Ground Current this device ideal for portable battery-operated equip- ment such as personal digital assistants (PDAs), cellu- 0.1A Shutdown Current lar phones, cordless phones, base stations, and notebook computers. Thermal Overload Protection Other features include an active-low open-drain reset Output Current Limit output that indicates when the output is out of regula- Tiny 800mW 6-Pin SOT23 Package tion, a 0.1A shutdown, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 800mW 6-pin SOT23 package. Ordering Information Applications Notebook Computers PART* TEMP RANGE PIN-PACKAGE Cellular and Cordless Telephones MAX1818EUT -T -40C to +85C 6 SOT23 MAX1818EUT T -40C to +85C 6 SOT23 Personal Digital Assistants (PDAs) Palmtop Computers *Insert the desired two-digit suffix (see Selector Guide) into the blanks to complete the part number. Base Stations Note: The MAX1818 requires a special solder temperature USB Hubs profile described in the Absolute Maximum Ratings section. Docking Stations T = Tape and reel. Denotes an RoHS-compliant package. Selector Guide appears at end of data sheet. Pin Configuration Typical Operating Circuit V = 2.5V TO 5.5V IN TOP VIEW V IN OUT OUT NC C C OUT IN IN16 OUT 3.3F 1F MAX1818 MAX1818 R POK POK 2 5 SET 100k ON TO SHDN POK C OFF SHDN34 GND SOT23 SET GND Maxim Integrated Products 1 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.500mA Low-Dropout Linear Regulator in SOT23 ABSOLUTE MAXIMUM RATINGS Operating Temperature Range ...........................-40C to +85C IN, SHDN, POK, SET to GND ...................................-0.3V to +6V Junction Temperature......................................................+150C OUT to GND ................................................-0.3V to (V + 0.3V) IN Output Short-Circuit Duration ...............................................1min Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) (Note 2) ...................+300C Continuous Power Dissipation (T = +70C) (Note 1) A 6-Pin SOT23 (derate 10mW/C above +70C)..............800mW 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 +70C. With a quarter square inch of copper, it will dissipate 790mW at +70C. 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 (V = V + 500mV or V = +2.5V, whichever is greater SHDN = IN, T = -40C to +85C, unless otherwise noted. Typical values IN OUT IN A are at T = +25C.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage V 2.5 5.5 V IN Input Undervoltage Lock-Out V Rising, 75mV hysteresis 2.0 2.15 2.3 V UVLO I = 100mA, T = +25C, V 2.0V -1 +1 OUT A OUT I = 100mA, V < 2.0V -1.5 +1.5 OUT OUT Output Voltage Accuracy V I = 100mA, T = -40C to +85C -2.5 +2.5 % OUT OUT A (Preset Mode) I = 1mA to 500mA, V > V + 0.5V, OUT IN OUT -3 +3 T = -40C to +85C A Adjustable Output Voltage 1.25 5 V Range V = 2.7V, IN T = 0C to +85C 1.225 1.250 1.275 A SET Voltage Threshold V I = 100mA, V SET OUT (Adjustable Mode) T = -40C to +85C 1.213 1.288 A V set to 2.0V OUT Guaranteed Output Current I V 2.7V 500 mA OUT IN (RMS) Short-Circuit Current Limit I V = 0, V 2.7V 0.55 0.8 1.8 A LIM OUT IN In-Regulation Current Limit V > 96% of nominal value, V 2.7V 1.6 A OUT IN SET Dual Mode Threshold 50 100 150 mV SET Input Bias Current I V = 1.25V -100 +100 nA SET SET I = 100A 125 250 OUT Ground-Pin Current I A Q I = 500mA 140 OUT V = 5V 100 220 OUT Dropout Voltage (Note 4) V - V I = 500mA V = 3.3V 120 215 mV IN OUT OUT OUT V = 2.5V 210 360 OUT V from (V + 100mV) to 5.5V, IN OUT Line Regulation V -0.15 0 +0.15 %/V LNR I = 5mA LOAD Dual Mode is a trademark of Maxim Integrated Products 2 MAX1818