The ADP2230 includes two high efficiency， low quiescent current， 800 mA， step-down， dc-to-dc converters in a small， 10-lead， 3 mm × 3 mm， LFCSP package. The total solution requires only five tiny external components. When the ADP2230 is used with three 0603 capacitors and two 2 mm × 2 mm inductors， the total solution size is about 48 mm2 ， resulting in the smallest footprint solution to meet a variety of portable applications. The ADP2230 buck regulator uses a proprietary， high speed， current mode， constant frequency， PWM control scheme for excellent stability and transient response. The buck outputs operate out of phase to reduce the input current ripple. To ensure the longest battery life in portable applications， the ADP2230 has a power saving variable frequency mode that reduces the switching frequency under light load conditions. During logic controlled shutdown， the input is disconnected from the output， and it draws less than 0.1 μA from the input source. The ADP2230 operates from input voltages from 2.3 V to 6.5 V， allowing the use of multiple alkaline， NiMH， or lithium cells and other standard power sources.