ADP2504

Data Sheet ADP2503/ADP2504 600 mA/1000 mA, 2.5 MHz Buck-Boost DC-to-DC Converters FEATURES ► 1 mm height profile ► Compact PCB footprint ► Seamless transition between modes ► 38 μA typical quiescent current ► 2.5 MHz operation enables 1.5 µH inductor ► Input voltage: 2.3 V to 5.5 V ► Fixed output voltage: 2.8 V to 5.0 V ► Adjustable model output voltage range: 2.8 V to 5.5 V ► 600 mA (ADP2503) and 1000 mA (ADP2504) output options ► Boost converter configuration with load disconnect ► SYNC pin with three different modes ► Power save mode (PSM) for improved light load efficiency ► Forced fixed frequency operation mode ► Synchronization with external clock ► Internal compensation ► Soft start ► Enable/shutdown logic input ► Overtemperature protection ► Short-circuit protection ► Undervoltage lockout protection ► Small 10-lead 3 mm × 3 mm LFCSP (QFN) package ► Supported by ADIsimPower™ design tool APPLICATIONS ► Wireless handsets ► Digital cameras/portable audio players ► Miniature hard disk power supplies ► USB powered devices TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION The ADP2503/ADP2504 are high efficiency, low quiescent current step-up/step-down dc-to-dc converters that can operate at input voltages greater than, less than, or equal to the regulated output voltage. The power switches and synchronous rectifiers are internal to minimize external device count. At high load currents, the ADP2503/ADP2504 use a current-mode, fixed frequency pulsewidth modulation (PWM) contro...