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MAX1774 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1774 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 21 page General Description The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detec- tors in a small 32-pin QFN or 28-pin QSOP package. The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V at over 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs. When the AC adapter power is removed, an external P- channel MOSFET switches input to the main battery. When the main battery is low, the backup step-up con- verter sustains the main output voltage. When the back- up battery can no longer deliver the required load, the system shuts down safely to prevent damage. Four on- board voltage detectors monitor the status of the AC adapter power, main battery, and backup battery. The MAX1774 evaluation kit is available to help reduce design time. ________________________Applications Hand-Held Computers PDAs Internet Access Tablets POS Terminals Subnotebooks Features o Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters o Thin, Small (1mm High) QFN Package o Step-Up Converter for Backup Battery o Main Power Adjustable from +1.25V to +5.5V Over 2A Load Current Up to 95% Efficiency o Core Power Adjustable from 1V to 5V Internal Switches Up to 1.5A Load Current Up to 91% Efficiency o Automatic Main Battery Switchover o 100% (max) Duty Cycle o Up to 1.25MHz Switching Frequency o Input Voltage Range from +2.7V to +28V o Four Low-Voltage Detectors o 170µA Quiescent Current o 8µA Shutdown Current o Digital Soft-Start o Independent Shutdown Inputs Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover ________________________________________________________________ Maxim Integrated Products 1 17 18 19 20 21 22 23 N.C. GND GND GND GND FBM CS+ CS- FBC GND INC 8 7 6 5 4 3 2 CVH PDRV IN CVL NDRV PGND PGNDC MAX1774 32 7mm x 7mm QFN 1 MDRV 24 ACO TOP VIEW Pin Configurations 19-1810; Rev 1; 1/02 EVALUATION KIT AVAILABLE Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1774EEI -40°C to +85°C 28 QSOP MAX1774EMJ -40°C to +85°C 32 7mm x 7mm QFN AC ADAPTER MAIN BATTERY BACKUP BATTERY MAIN (+3.3V) CORE (+1.8V) AC OK LOW MAIN BATTERY DEAD MAIN BATTERY MAX1774 Functional Diagram Pin Configurations continued at end of data sheet. 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. |
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