AP1605 consists of CMOS step-down switchingregulator with PWM/PFM dual mode control. Thesedevices include a reference voltage source, oscillationcircuit, error amplifier, internal PMOS and etc.AP1605 provides low-ripple power, high efficiency,and excellent transient characteristics. ThePWM/PFM control circuit is able to very the duty ratiolinearly 0%~0.25% (PFM) and 25%~100% (PWM).With the addition of an internal P-channel Power MOS,a coil, capacitors, and a diode connected externally,these ICs can function as step-down switchingregulators. They serve as ideal power supply units forportable devices when coupled with the SOP–8Lmini-package, providing such outstanding features aslow current consumption. Since this converter canaccommodate an input voltage of up to 7V, it is alsoideal when operating via an AC adapter.
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