AP1604AP1604 PWM/PFM Dual Mode Step-down DC/DC Converter Features - Input voltage range: 2.2V~5.5V (VOUT type) - Oscillator frequency: 600KHz (Typ.) - Internal reference: 1.0V (Typ.) - High efficiency: 93% (Typ .) - Stand-by capability: ISTB=2A. (Typ.) - Soft-start time set-up externally type possible - Current limit and thermal shutdown protection - Pb-Free Package: SOT23-5, SON-6(3×3×0.8mm) General Descriptions The AP1604 series are multi-functional step-down DC/DC converters with built-in speed, low ON resistance drivers. It is capable to deliver more than 800mA output current with external coil, diode and capacitor. Output voltage is set-up by the external resistors. (± 2.5% accuracy). The 600KHz AP1604 that can work out with small value external components comes out more compact board. T……