EE Times - August 6, 2007 - (Page 41) Less Is More 6V TO 40V HIGH VOLTAGE BUCK DC/DC Optional Bat-TrackTM VC ACPR USB VBUS VOUT BAT VOUT 5V Adapter + 5V Charge LTC3557 LDO3V3 CHRG GND SW1 SW2 SW3 Single Cell Li-Ion/Polymer LDO, 3.3V/25mA VOUT1, 600mA VOUT2, 400mA VOUT3, 400mA No Hassle Portable Power Our LTC ®3557 Power Management IC includes all the “hard-to-do” power functions, including PowerPath™ control, battery charging, power selection and multiple output regulators. With its linear PowerPath front end, the LTC3557 provides seamless transition between multiple power sources, as well as high efficiency charging and instant-on operation. The regulators, control and charging are all packed in a low profile 4mm x 4mm QFN package and needs no microprocessor for operation. Features • Seamless Transition Between Input Power Sources: Li-Ion Battery, USB, 5V Wall Adapter or High Voltage Buck Regulator with Battery Tracking to Minimize Heat • Internal Ideal Diode Provides Low Loss PowerPath • Triple Adjustable High Efficiency Step-Down Switching Regulators (600mA, 400mA, 400mA IOUT) • Pin-Selectable Burst Mode® Operation for Long Run Time • 1.5A Maximum Charge Current with Thermal Limiting • Low-Profile (0.75mm) 4mm x 4mm 28-Pin QFN Package LTC3557 Demo Board Info & Free Samples www.linear.com/3557 14mm 1-800-4-LINEAR 21mm Actual Size Free Portable Solutions Brochure No µController Needed for Charging or PowerPath Control www.linear.com/portsolutions , LTC, LT and Burst Mode are registered trademarks and PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. http://www.linear.com/3557 http://www.linear.com/portsolutions http://www.linear.com/portsolutions
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