MAX1760/MAX1760H 19-1660 Rev 3 1/07 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter General Description Features The MAX1760/MAX1760H are high-efficiency, low-noise, Up to 94% Efficiency step-up DC-DC converters intended for use in battery- 0.7V to 5.5V Input Range powered wireless applications. They combine low quies- Up to 800mA Output cent supply current (100A) with a high 1MHz operating frequency. Small external components and tiny 10-pin Fixed 3.3V Output (or Adjustable from 2.5V to 5.5V) TDFN and MAX packages make this device an excel- PWM Synchronous-Rectified Topology lent choice for small hand-held applications. The Low-Noise, Constant-Frequency Operation (1MHz) MAX1760 is activated by a logic-low ON signal while the MAX1760H is activated by a logic-high ON input. 0.1A Logic-Controlled Shutdown Both devices use a synchronous-rectified pulse-width- Synchronizable Switching Frequency modulation (PWM) boost topology to generate 2.5V to Adjustable Current Limit 5.5V outputs from a wide range of inputs, such as 1 to 3 Adjustable Soft-Start alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Proprietary Idle-Mode circuitry significantly 10-Pin MAX Package improves light-load efficiency and smoothly transitions to 10-Pin 3mm x 3mm TDFN Package fixed-frequency PWM operation at higher load currents. Low-noise, forced-PWM mode is available for applica- tions requiring constant-frequency operation at all load Ordering Information currents. PWM operation can also be synchronized to an external clock to protect sensitive frequency bands PIN- ON PART PKG CODE in communications equipment. Analog soft-start and PACKAGE LOGIC adjustable current limit permit optimization of efficiency, T1033-1 MAX1760ETB 10 TDFN-EP* Low external component size, and output voltage ripple. U10-2 MAX1760EUB 10 MAX Low T1033-1 MAX1760HETB 10 TDFN-EP* High Applications U10-2 MAX1760HEUB 10 MAX High Digital Cordless Phones PCS Phones *EP = Exposed paddle. Wireless Handsets Handheld Instruments Note: All devices are specified over the -40C to +85C operating temperature range. Palmtop Computers Personal Communicators Two-Way Pagers Typical Operating Circuit Pin Configurations INPUT = 0.7V TOP VIEW TO V OUT MAX1760 ISET 1 10 ON (ON) ISET 1 10 ON (ON) ON LX REF 2 9 POUT REF 2 9 POUT V = 3.3V, OUT CLK/SEL POUT MAX1760 MAX1760 800mA GND 3 8 LX GND 3 8 LX MAX1760H MAX1760H FB 4 7 PGND FB 4 7 PGND ISET OUT 5 6 CLK/SEL 6 CLK/SEL OUT 5 REF OUT MAX TDFN FB GND PGND (3mm x 3mm) (ON) FOR MAX1760H MAX is a registered trademark of Maxim Integrated Products, Inc. Idle Mode is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS 10-Pin TDFN-EP (derate 18.5mW/C above +70C) .....1482mW ON, ON, OUT, CLK/SEL to GND ..................................-0.3V to +6V Multilayer Board: PGND to GND ..........................................................................0.3V LX to PGND .................................................-0.3V to (V + 0.3V) 10-Pin MAX (derate 8.8mW/C above +70C) ...........707mW POUT 10-Pin TDFN-EP (derate 24.4mW/C above +70C) .....1951mW POUT to OUT ...........................................................................0.3V REF, FB, ISET, POUT to GND.......................-0.3V to (V + 0.3V) Operating Temperature Range................................-40C to +85C OUT Junction Temperature...........................................................+150C Continuous Power Dissipation (T = +70C) A Storage Temperature Range .................................-65C to +150C Single-Layer Board: 10-Pin MAX Lead Temperature (soldering, 10s)......................................+300C (derate 5.6mW/C above +70C)..................................444mW 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 = FB = PGND = GND, ISET = REF, OUT = POUT, V = 3.6V, T = 0C to +85C. Typical values are at T = +25C, OUT A A unless otherwise noted.) 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 (Note 2) 0.9 1.1 V LOAD A Temperature Coefficient of Startup Voltage I < 1mA -2.3 mV/C LOAD 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 (Note 3) 80 86 90 % External Clock Frequency Range 0.5 1.2 MHz V < 0.1V, CLK/SEL = OUT, includes load FB Output Voltage 3.17 3.3 3.38 V regulation for 0 < I < 0.55A LX Adjustable output, CLK/SEL = OUT, includes FB Regulation Voltage 1.215 1.240 1.270 V load regulation for 0 < I < 0.55A LX V = 1.35V (T = +25C, MAX1760ETB, FB A FB Input Leakage Current 0.01 100 nA MAX1760HETB) CLK/SEL = OUT, no load to full load Load Regulation -1.5 % (0 < I < 1.0A) LX Output Voltage Adjust Range 2.5 5.5 V Output Voltage Lockout Threshold Rising edge (Note 4) 2.00 2.15 2.30 V V = 1.25V (T = +25C, MAX1760ETB, ISET A ISET Input Leakage Current 0.01 50 nA MAX1760HETB) Supply Current in Shutdown V = 3.6V, V = 0V 0.1 5 A ON ON No-Load Supply Current CLK/SEL = GND (Note 5) 100 185 A No-Load Supply Current Forced-PWM Mode CLK/SEL = OUT 2.5 mA DC-DC SWITCHES V = 0, V = 5.5V (T = +25C, LX OUT A POUT Leakage Current 0.1 10 A MAX1760ETB, MAX1760HETB) V = V = 5.5V, in shutdown (T = LX OUT A LX Leakage Current 0.1 10 A +25C, MAX1760ETB, MAX1760HETB) 2 MAX1760/MAX1760H