MAX1700/MAX1701 19-4759 Rev 1 1/99 1-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters General Description Features The MAX1700/MAX1701 are high-efficiency, low-noise, Up to 96% Efficiency step-up DC-DC converters intended for use in battery- 1.1 V Guaranteed Start-Up IN powered wireless applications. They use a synchro- nous-rectified pulse-width-modulation (PWM) boost 0.7V to 5.5V Input Range topology to generate 2.5V to 5.5V outputs from battery Up to 800mA Output inputs such as one to three NiCd/NiMH cells or one Li- Ion cell. Both devices have an internal 1A, 130m N- Step-Up Output (adjustable from 2.5V to 5.5V) channel MOSFET switch and a 250m P-channel PWM/PFM Synchronous-Rectified Topology synchronous rectifier. With their internal synchronous rectifier, the MAX1700/ External Clock or Internal 300kHz Oscillator MAX1701 deliver 5% better efficiency than similar non- 3A Logic-Controlled Shutdown synchronous converters. They also feature a pulse- frequency-modulation (PFM) standby mode to improve Power-Good Output (MAX1701) efficiency at light loads, and a 3A shutdown mode. Low-Battery Comparator (MAX1701) The MAX1700/MAX1701 come in 16-pin QSOP pack- Uncommitted Gain Block (MAX1701) ages (which occupy the same space as an 8-pin SO). The MAX1701 includes two comparators to generate power-good and low-battery warning outputs. It also contains a gain block that can be used to build a linear Ordering Information regulator using an external P-channel pass device. For higher-power outputs, refer to the MAX1703. For PART TEMP. RANGE PIN-PACKAGE dual outputs (step-up and linear regulator), refer to the MAX1700EEE -40C to +85C 16 QSOP MAX1705/MAX1706. For an on-board analog-to-digital MAX1701EEE -40C to +85C 16 QSOP converter, refer to the MAX848/MAX849. The MAX1701 evaluation kit is available to speed design time. Typical Operating Circuit Applications Digital Cordless Phones Personal Communicators INPUT PCS Phones Palmtop Computers 0.7V TO 5.5V Wireless Handsets Hand-Held Instruments Two-Way Pagers OUTPUT Pin Configurations 3.3V OR ADJ MAX1700 UP TO 800mA ON TOP VIEW OFF ONA LX OFF I.C. 1 16 I.C. ON ONB I.C. 2 15 POUT PWM REF 3 14 OUT OR CLK/SEL POUT PFM SYNC CLK/SEL 4 MAX1700 13 LX GND 5 12 PGND REF OUT I.C. 6 11 FB FB GND PGND ONB 7 10 I.C. ONA 8 9 I.C. QSOP I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For free samples & the latest literature: 1-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS Operating Temperature Ranges ONA, ONB, OUT, AO, POK, LBO to GND...................-0.3V, +6V PGND to GND.....................................................................0.3V MAX1700EEE, MAX1701EEE ...........................-40C to +85C Junction Temperature......................................................+150C LX to PGND.....................................................-0.3V,V +0.3V POUT CLK/SEL, AIN, REF, FB, LBP, LBN, POUT to GND............-0.3V, Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C V +0.3V ................................................................................... OUT Continuous Power Dissipation (T =+70C) A 16-QSOP (Derate 8.30mW/C above +70C) ...............667mW 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 = ONA = ONB = FB = PGND = GND, OUT = POUT, V = 3.6V (Note 6) MAX1701: AIN = LBN = GND, LBP = REF, OUT T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) A A PARAMETER CONDITIONS MIN TYP MAX UNITS DC-DC CONVERTER Input Voltage Range (Note 1) 0.7 5.5 V Minimum Start-Up Voltage I < 1mA, T = +25C 0.9 1.1 V LOAD A (Note 2) Frequency in Start-Up Mode V = 1.5V 40 150 300 kHz OUT V < 0.1V, CLK/SEL = OUT, V = 2.4V, BATT FB Output Voltage (Note 3) 3.17 3.30 3.38 V includes load regulation error for 0A I 0.55A LX Adjustable output, CLK/SEL = OUT, V = 2.4V, BATT FB Regulation Voltage 1.210 1.24 1.255 V includes load regulation error for 0A I 0.55A LX FB Input Current V = 1.25V 0.01 20 nA FB Output Voltage Adjust Range 2.5 5.5 V Output Voltage Lockout (Note 4) 2.0 2.15 2.3 V Threshold Load Regulation (Note 5) CLK/SEL = OUT, No load to full load -1.6 % MAX1700 0.1 20 Supply Current in Shutdown V = 3.6V A ONB MAX1701 320 CLK/SEL = GND (MAX1700) 35 70 Supply Current in Low-Power A Mode (Note 6) CLK/SEL = GND (MAX1701) 55 110 CLK/SEL = OUT (MAX1700) 125 250 Supply Current in Low-Noise A Mode (Note 6) CLK/SEL = OUT (MAX1701) 140 300 DC-DC SWITCHES POUT Leakage Current V = 0V, V = 5.5V 0.1 20 A LX OUT LX Leakage Current V = V = V = 5.5V 0.1 20 A LX ONB OUT CLK/SEL = GND 0.2 0.45 N-channel Switch On-Resistance CLK/SEL = OUT 0.13 0.28 P-channel 0.25 0.5 CLK/SEL = OUT 1100 1300 1600 N-Channel Current Limit mA CLK/SEL = GND 250 400 550 P-Channel Turn-Off Current CLK/SEL = GND 20 120 mA 2 MAX1700/MAX1701