MAX1763 19-1698 Rev 2 4/11 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter General Description Features The MAX1763 is a high-efficiency, low-noise, step-up Up to 94% Efficiency DC-DC converter intended for use in battery-powered +0.7V to +5.5V Input Voltage Range wireless applications. This device maintains exception- 1.1V Guaranteed Startup Input Voltage ally low quiescent supply current (110A) despite its high 1MHz operating frequency. Small external compo- Up to 1.5A Output nents and a tiny package make this device an excellent Fixed 3.3V Output or Adjustable (2.5V to 5.5V) choice for small hand-held applications that require the 1MHz PWM Synchronous-Rectified Topology longest possible battery life. 1A Logic-Controlled Shutdown The MAX1763 uses a synchronous-rectified pulse- width-modulation (PWM) boost topology to generate Analog Gain Block for Linear-Regulator or Low- 2.5V to 5.5V outputs from a wide range of input Battery Comparator sources, such as one to three alkaline or NiCd/NiMH Adjustable Current Limit and Soft-Start cells or a single Lithium-ion (Li+) cell. Maxim s propri- 1.5W TSSOP Package Available etary Idle Mode circuitry significantly improves effi- ciency at light load currents while smoothly transitioning Idle Mode is a trademark of Maxim Integrated Products. to fixed-frequency PWM operation at higher load cur- rents to maintain excellent full-load efficiency. Low- Applications noise, forced-PWM mode is available for applications that require constant-frequency operation at all load Digital Cordless Hand-Held currents. The MAX1763 may also be synchronized to Phones Instruments an external clock to protect sensitive frequency bands PCS Phones Palmtop Computers in communications equipment. Wireless Handsets Personal The MAX1763 includes an on-chip linear gain block Communicators that can be used to build a high-power external linear regulator or as a low-battery comparator. Soft-start and Ordering Information current limit functions permit optimization of efficiency, external component size, and output voltage ripple. PART TEMP RANGE PIN-PACKAGE The MAX1763 is available in a space-saving 16-pin MAX1763EEE+ -40C to +85C 16 QSOP QSOP package or a high-power (1.5W) 16-pin TSSOP- EP package. MAX1763EUE+ -40C to +85C 16 TSSOP-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. Typical Operating Circuit *EP = Exposed pad Pin Configuration 1.5H IN 0.7V TO 5.5V OUT TOP VIEW LX 3.3V AT 1.5A POUT ONA 1 16 ONB ISET 2 15 POUT MAX1763 OFF ONB ON OUT REF 3 14 LX ON ONA OFF GND 4 MAX1763 13 POUT PWM CLK/SEL OR NORMAL FB 12 5 PGND LBI OR GAIN AIN OUT 6 11 LX BLOCK INPUT ISET AIN 7 10 PGND REF AO LBO OR AO 8 9 CLK/SEL FB GND PGND GAIN BLOCK OUTPUT QSOP TSSOP-EP 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. EVALUATION KIT AVAILABLE1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS ONA, ONB, AO, OUT to GND.......................................0.3V, +6V Continuous Power Dissipation 16-Pin QSOP (derate 8.7mW/C above +70C)...........667mW PGND to GND.....................................................................0.3V LX to PGND ............................................-0.3V to (V + 0.3V) 16-Pin TSSOP-EP (derate 19mW/C above +70C)...........1.5W POUT Operating Temperature Range ...........................-40C to +85C CLK/SEL, REF, FB, ISET, POUT, Junction Temperature......................................................+150C AIN to GND.........................................-0.3V to (V + 0.3V) OUT POUT to OUT......................................................................0.3V Storage Temperature Range .............................-65C to +150C 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. ELECTRICAL CHARACTERISTICS (CLK/SEL = ONB = FB = PGND = GND, ISET = REF, OUT = POUT, V = V = V = 3.6V, T = 0C to +85C, unless other- ONA AIN OUT A wise noted. Typical values are at T = +25C.) A PARAMETER CONDITIONS MIN TYP MAX UNITS DC-DC CONVERTER Input Voltage Range (Note 1) 0.7 5.5 V Minimum Startup Voltage I < 1mA, T = +25C 0.9 1.1 V LOAD A (Note 2) Temperature Coefficient of I < 1mA -2 mV/C LOAD Startup Voltage Frequency in Startup Mode V = 1.5V 125 500 1000 kHz OUT Internal Oscillator Frequency CLK/SEL = OUT 0.8 1 1.2 MHz Oscillator Maximum Duty Cycle 80 86 90 % (Note 3) External Clock Frequency Range 0.5 1.2 MHz V < 0.1V, CLK/SEL = OUT, includes load regulation FB Output Voltage 3.17 3.3 3.38 V for 0 < I < 1.1A LX Adjustable output, CLK/SEL = OUT, includes load FB Regulation Voltage 1.215 1.245 1.270 V regulation for 0 < I < 1.1A LX FB Input Current V = 1.35V 0.01 100 nA FB Load Regulation CLK/SEL = OUT, 0 < I < 1.1A -1.0 % LX Output Voltage Adjust Range 2.5 5.5 V Output Voltage Lockout Rising edge 2.00 2.15 2.30 V Threshold (Note 4) ISET Input Leakage Current V = 1.25V 0.01 50 nA ISET Supply Current in Shutdown V = 3.6V, V = 0V 1 10 A ONB ONA No-Load Supply Current, Low- CLK/SEL = GND, AIN = OUT 110 200 A Power Mode (Note 5) No-Load Supply Current, Low- CLK/SEL = OUT 2.5 mA Noise Mode Gain Block Supply Current V < (V - 1.4V), gain block enabled 25 50 A AIN OUT 2 MAX1763