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MAX1927REUB Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1927REUB Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page General Description The MAX1927/MAX1928 800mA step-down converters power low-voltage microprocessors in compact equip- ment requiring the highest possible efficiency. The MAX1927/MAX1928 are optimized for generating low output voltages (down to 750mV) at high efficiency using small external components. The supply voltage range is from 2.6V to 5.5V and the guaranteed minimum output current is 800mA. 1MHz pulse-width modulation (PWM) switching allows for small external components. A unique control scheme minimizes ripple at light loads, while maintaining a low 140µA quiescent current. The MAX1927/MAX1928 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. 100% duty-cycle operation allows for a dropout voltage of only 340mV at 800mA. Other features include internal soft-start, power-OK (POK) output, and selectable forced PWM operation for lower noise at all load currents. The MAX1928 is available with several preset output voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and 2.5V (MAX1928-25). The MAX1927R has adjustable output range down to 0.75V. The MAX1927/MAX1928 are available in a tiny 10-pin µMAX package. Applications WCDMA Handsets PDAs and Palmtops DSP Core Power Battery-Powered Equipment Features o 800mA Output Current o Output Voltages from 0.75V to 5V o 2.6V to 5.5V Input Voltage Range o Power-OK Output o No Schottky Diode Required o Selectable Forced PWM Operation o 1MHz Fixed-Frequency PWM Operation o 140µA Quiescent Current o Soft-Start o 10-Pin µMAX Package Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters ________________________________________________________________ Maxim Integrated Products 1 Ordering Information BATT COMP GND REF PGND LX POK FB VIN 2.6V TO 5.5V C1 C2 CC RC L1 VOUT 0.75V AT 800mA SHDN PWM MAX1927R Cf Typical Operating Circuit 19-2527; Rev 0; 7/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART PRESET OUTPUT VOLTAGE TEMP RANGE PIN- PACKAGE MAX1927REUB Adj. to 0.75V -40 °C to +85°C 10 µMAX MAX1928EUB15 1.5V -40 °C to +85°C 10 µMAX MAX1928EUB18 1.8V -40 °C to +85°C 10 µMAX MAX1928EUB25 2.5V -40 °C to +85°C 10 µMAX 1 2 3 4 5 10 9 8 7 6 POK BATT LX PGND FB REF GND PWM MAX1927R MAX1928 µMAX TOP VIEW COMP SHDN Pin Configuration |
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