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MAX1653 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1653 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 28 page For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. General Description The MAX1652–MAX1655 are high-efficiency, pulse- width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin- compatible upgrades to the popular MAX797. Improve- ments include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655). The MAX1652–MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode™ syn- chronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire out- put current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensi- tive applications. All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switch- es are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost. The MAX1652 and MAX1654 have an additional feed- back pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output. The MAX1652–MAX1655 have a 4.5V to 30V input volt- age range. The MAX1652/MAX1653/MAX1654’s output range is 2.5V to 5.5V while the MAX1655’s output range extends down to 1V. An evaluation kit (MAX1653EVKIT) is available to speed designs. Applications Notebook Computers PDAs Cellular Phones Hand-Held Computers Handy-Terminals Mobile Communicators Distributed Power ____________________________Features o 96% Efficiency o Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO) o Pin-Compatible with MAX797 (MAX1653/MAX1655) o Output Voltage Down to 1V (MAX1655) o 4.5V to 30V Input Range o 99% Duty Cycle for Lower Dropout o 170µA Quiescent Supply Current o 3µA Logic-Controlled Shutdown o Dual, N-Channel, Synchronous-Rectified Control o Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz o Programmable Soft Start o Low-Cost Secondary Outputs (MAX1652/MAX1654) High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP ________________________________________________________________ Maxim Integrated Products 1 19-1357; Rev 1; 7/98 EVALUATION KIT AVAILABLE Ordering Information Selection Guide Pin Configurations appear at end of data sheet. Idle Mode is a trademark of Maxim Integrated Products. PART FEEDBACK VOLTAGE (V) SPECIAL FEATURE COMPATIBILITY MAX1652 2.5 Regulates positive secondary voltage (such as +12V) Same pin order as MAX796, but smaller package MAX1653 2.5 Logic-controlled, low-noise mode Pin-compatible with MAX797 MAX1654 2.5 Regulates negative secondary voltage (such as -5V) Same pin order as MAX799, but smaller package MAX1655 1 Low output volt- ages (1V to 5.5V); logic-controlled, low-noise mode Pin compatible with MAX797 (except for feed- back voltage) PART MAX1652EEE -40°C to +85°C TEMP. RANGE PIN-PACKAGE 16 QSOP MAX1653EEE -40°C to +85°C 16 QSOP MAX1654EEE -40°C to +85°C 16 QSOP MAX1653ESE -40°C to +85°C 16 Narrow SO MAX1655ESE -40°C to +85°C 16 Narrow SO MAX1655EEE -40°C to +85°C 16 QSOP |
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