AP1605 (Obsolete)

Description

AP1605 consists of CMOS step-down switching regulator with PWM/PFM dual mode control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1605 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM/PFM control circuit is able to vary the duty ratio linearly 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 switching regulators. They serve as ideal power supply units for portable devices when coup°C with the SO–8 mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage of up to 7V, it is also ideal when operating via an AC adapter.

Application(s)

• On-board power supply of battery devices for portable telephones, electronic notebooks, PDA, and other hand-held sets
• Power supplies for audio equipment, including portable CD players and headphone stereo equipment
• Fixed voltage power supply for cameras, video equipment and communications equipment
• Power supplies for microcomputers.
• Conversion from four Ni-H or Ni-Cd cells or two lithium-ion cells to 3.3V/3V
• Conversion of AC adapter input to 5V/3V