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MAX8732 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8732 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 32 page  General Description The MAX8732/MAX8733/MAX8734 dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732/MAX8733/MAX8734 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the main SMPS outputs. The MAX8732/MAX8733/MAX8734 include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output dis- charge that prevents negative voltages on shutdown. Maxim’s proprietary Quick-PWM™ quick-response, con- stant on-time PWM control scheme operates without sense resistors and provides 100ns response to load tran- sients while maintaining a relatively constant switching fre- quency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The MAX8732 features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX8733 features a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light” applications. The MAX8734 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respec- tively. The MAX8732/MAX8733/MAX8734 are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C). The MAX8732/MAX8733/MAX8734 are pin-for-pin upgrades to the MAX1777/MAX1977/MAX1999. The MAX1999 Evaluation Kit can be used to evaluate the MAX8732/MAX8733/MAX8734. Applications Notebook and Subnotebook Computers PDAs and Mobile Communication Devices 3- and 4-Cell Li+ Battery-Powered Devices Features ♦ No Current-Sense Resistor Needed (MAX8734) ♦ Accurate Current Sense with Current-Sense Resistor (MAX8732/MAX8733) ♦ 1.5% Output Voltage Accuracy ♦ 3.3V and 5V 100mA Bootstrapped Linear Regulators ♦ Internal Soft-Start and Soft-Stop Output Discharge ♦ Quick-PWM with 100ns Load Step Response ♦ 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™) ♦ 4.5V to 24V Input Voltage Range ♦ Enhanced Ultrasonic Pulse-Skipping Mode (25kHz min) ♦ Power-Good (PGOOD) Signal ♦ Overvoltage Protection Enable/Disable High-Efficiency, Quad-Output, Main Power- Supply Controllers for Notebook Computers ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3355; Rev 0; 8/04 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 TEMP RANGE PIN- PACKAGE 5V/3V SWITCHING FREQUENCY MAX8732EEI -40°C to +85°C 28 QSOP 200kHz/300kHz MAX8733EEI -40°C to +85°C 28 QSOP 400kHz/500kHz MAX8734EEI -40°C to +85°C 28 QSOP 200kHz/300kHz or 400kHz/500kHz Quick-PWM and Dual Mode are trademarks of Maxim Integrated Products, Inc. 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 BST3 LX3 DH3 LDO3 DL3 GND LX5 OUT3 OUT5 V+ DL5 LDO5 VCC DH5 BST5 TON ILIM5 FB5 REF FB3 ILIM3 ON5 ON3 PGOOD N.C. QSOP TOP VIEW MAX8734 SHDN PRO SKIP Pin Configurations Pin Configurations continued at end of data sheet. |
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