1. Overview:

️· Product: AP1635 is a PWM/PFM dual mode step-down DC-DC converter. This means it efficiently reduces a higher DC voltage to a lower DC voltage. It can operate in two modes: Pulse Width Modulation (PWM) for higher efficiency at heavier loads, and Pulse Frequency Modulation (PFM) for better light-load efficiency.
️· Application: It's designed for use in applications requiring efficient voltage regulation, often in portable devices and battery-powered systems.

2. Key Features & Specifications:

️· Input Voltage: 2.2V to 5.5V
️· Output Voltage: Configurable via external resistors. A formula is provided: `Vout = 1 * (1 + R2/R1)` where `R1` is between 100K and 200K.
️· Operating Modes: PWM (for efficiency at higher loads) and PFM (for efficiency at light loads).
️· Efficiency: Up to 93%
️· Protection: Includes overcurrent protection and undervoltage lockout (UVLO).
️· Frequency: Oscillates around 700kHz.
️· Standby Current: Very low, around 6µA
️· Package: SOP-8L

3. Electrical Characteristics (Important Values):

️· FB Voltage: 1.0V (typical)
️· UVLO Voltage: 2V (minimum operating voltage)
️· Line & Load Regulation: Specifies the voltage stability under varying input voltage and load.
️· Current Limit: 1200mA - 1600mA (peak)
️· Rdson (Resistance on): 350mΩ - 450mΩ

4. Physical Characteristics & Marking:

️· SOP-8L Package: Standard surface-mount package.
️· Marking: The top of the package contains markings including:
- Part Number (AP1635)
- Year Code
- Week Code
- Internal ID Code

5. Application Considerations:

️· External Components: Requires external resistors (R1 and R2) to set the output voltage.
️· Typical Application Circuit: A basic circuit diagram is provided, illustrating the connections for a standard application.
️· Performance Characteristics: Includes graphs and data illustrating performance metrics such as efficiency, current limit, and voltage regulation.

6. Important Notices:

️· Changes Without Notice: Diodes Incorporated reserves the right to modify specifications without prior notification.
️· Life Support Systems: The AP1635 is not authorized for use in life support systems without specific approval from Diodes Incorporated.