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AP1605 (Obsolete)

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING REGULATOR

Datasheet

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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

Specifications & Technical Documents

Product Parameters

Efficiency (%)	93
Frequency Typ (Hz)	300
Frequency Typ (kHz)	300
HS RDS(ON) (mΩ)	N/A
LS RDS(ON) (mΩ)	N/A
MaximumInput Voltage (V)	7
Maximum Output Voltage (V)	VIN
MinimumInput Voltage (V)	2.5
Minimum Output Voltage (V)	2.2
Output Current (A)	3
Output Current (A)	3
Output Voltage (V)	2.2 to VCC ADJ
Quiescent Current Typ (μA)	0.1
Shutdown Current Typ (µA)	2
Shutdown Current Typ (µA)	2
Type	Buck

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products