Description

The AP1551 is a monolithic IC designed for dual channel step-down DC/DC converters. It has the ability to drive a 2A load on each channel without requiring additional transistor components. The AP1551 reduces the number of external components, making it easy to save board space. It features an external shutdown function that can be controlled by logic level, allowing it to enter standby mode. The internal compensation provides good line and load regulation for feedback control without needing external design.

Specifications and features

• Dual adjustable output channel
• Adjustable output voltage range: 1.23V to 18V+4%
• 150KHz +15% fixed switching frequency
• Voltage mode non-synchronous PWM control
• Thermal-shutdown and current-limit protection
• ON/OFF shutdown control input
• Operating voltage can be up to 22V
• Output load current: 2A
• SOP-16L Pb-Free packages
• Low power standby mode
• Built-in switching transistor on chip

Application Scenarios

• Simple High-efficiency step-down regulator
• On-card switching regulators
• Positive to negative converter

Comparison

- Dual channel design allows for driving a 2A load on each channel without additional transistor components

- Reduces the number of external components, saving board space

- Internal compensation provides good line and load regulation without external design

- Adjustable output voltage range

- Thermal-shutdown and current-limit protection for added safety

- ON/OFF shutdown control input and low power standby mode for power management

- Built-in switching transistor on chip for convenience

- Fixed switching frequency may not be suitable for all applications