EVALUATION KIT AVAILABLE MAX618 28V Internal Switch, Step-Up DC-DC Converter General Description Features The MAX618 CMOS, PWM, step-up DC-DC converter Adjustable Output Voltage Up to +28V generates output voltages up to 28V and accepts inputs Up to 93% Efficiency from +3V to +28V. An internal 2A, 0.3 switch eliminates Wide Input Voltage Range (+3V to +28V) the need for external power MOSFETs while supplying output currents up to 500mA or more. A PWM control Up to 500mA Output Current at +12V scheme combined with Idle Mode operation at light 500A Quiescent Supply Current loads minimizes noise and ripple while maximizing effi- 3A Shutdown Current ciency over a wide load range. No-load operating current 250kHz Switching Frequency is 500A, which allows efficiency up to 93%. Small 1W, 16-Pin QSOP Package A fast 250kHz switching frequency allows the use of small surface-mount inductors and capacitors. A shut- down mode extends battery life when the device is not in Ordering Information use. Adaptive slope compensation allows the MAX618 to accommodate a wide range of input and output voltages PART TEMP. RANGE PIN-PACKAGE with a simple, single compensation capacitor. MAX618EEE+ -40C to +85C 16 QSOP The MAX618 is available in a thermally enhanced 16-pin +Denotes a lead(Pb)-free/RoHS-compliant package. QSOP package that is the same size as an industry- standard 8-pin SO but dissipates up to 1W. An evaluation kit (MAX618EVKIT) is available to help speed designs. Typical Application Circuit Applications Industrial +24V and +28V Systems LCD Displays Palmtop Computers V V IN OUT Pin Configuration 3V TO IN LX UP TO 28V 28V MAX618 TOP VIEW + SHDN PGND GND 1 16 GND LX 2 15 PGND LX 3 14 PGND MAX618 VL FB LX 4 13 PGND SHDN 5 12 GND COMP 6 11 VL COMP GND FB 7 10 IN GND 8 9 GND QSOP Idle Mode is a trademark of Maxim Integrated Products, Inc. 19-1462 Rev 2 4/15MAX618 28V Internal Switch, Step-Up DC-DC Converter Absolute Maximum Ratings IN to GND ...............................................................-0.3V to +30V Continuous Power Dissipation (T = +70C) (Note 1) A LX to GND ..............................................................-0.3V to +30V 16-Pin QSOP (derate 15mW/C above +70C)...................1W VL to GND ................................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C SHDN, COMP, FB to GND ............................-0.3V to (VL + 0.3V) Junction Temperature......................................................+150C PGND to GND.....................................................................0.3V Storage Temperature Range .............................-65C to +150C Soldering Temperature (reflow) .......................................+260C 2 Note 1: With part mounted on 0.9 in. of copper. 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 = +6V, PGND = GND, C = 4.7F, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) IN VL A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage V 3 28 V IN Supply Current, No Load I V = 3V to 28V, V = 1.6V, SHDN = VL 500 700 A IN IN FB V = 3V to 5.5V, V = 1.4V, Supply Current, Full Load, VL IN FB I 5 6.5 mA IN Connected to IN SHDN = VL = IN V = 3.4V to 28V, V = 1.4V, IN FB Supply Current, Full Load I 2.5 3.5 mA IN SHDN = VL, V < V VL IN Shutdown Supply Current I V = 28V, V = 1.6V, SHDN = GND 3 8 A IN IN FB VL Output Voltage V V = 3.5V or 28V, no load 2.9 3.05 3.2 V VL IN VL Load Regulation I = 0 to 2mA, V = 1.6V 25 40 mV DV LOAD FB VL VL Undervoltage Lockout Rising edge, 1% hysteresis 2.58 2.7 2.8 V FB Set Voltage V 1.47 1.5 1.53 V FB FB Input Bias Current I V = 1.6V 1 50 nA FB FB Line Regulation V = 3V to 6V,V = 12V 0.01 0.08 %/V DV IN OUT OUT Load Regulation V = 12V, I = 10mA to 500mA 0.2 % DV OUT LOAD OUT LX Voltage V 28 V LX LX Switch Current Limit I PWM mode 1.7 2.2 2.7 A LXON Idle Mode Current Limit 0.25 0.35 0.45 A Threshold LX On-Resistance R 0.3 0.6 LXON LX Leakage Current I V = 28V 0.02 10 A LXOFF LX COMP Maximum Output Current I FB = GND 100 200 A COMP COMP Voltage to Switch Current 0.8 1 mmho DFB = 0.1V Transconductance SHDN Input Logic Low V 0.8 V IL V 2.0 V SHDN Input Logic High IH Shutdown Input Current SHDN = GND or VL 1 A Switching Frequency f 200 250 300 kHz Maximum Duty Cycle DC 90 95 % Maxim Integrated 2 www.maximintegrated.com