General Description

The LD7412 is a high efficiency asynchronous buck converter with a constant-frequency, and voltage-mode architecture. It achieves 2A continuous output current over a wide input voltage ranging from 4.3V to 18V. The IC provides a feed forward voltage mode operation to achieve the fast line-transient response. The LD7412 also provides soft-start function to prevent overshoot during startup.
Fault condition protections include cycle-by-cycle current limiting and hiccup overload protection, which can reduce the operation frequency from 400kHz to 50kHz.
The LD7412 minimizes the number of external components to complete a 2A step-down DC-DC converter solution.
 

Features

• High Efficiency: Up to 90%
• Wide Operating Input Voltage Range: 4.3V to 18V
• Adjustable Output Voltage Range: 0.8V to Vin.
• Duty Ratio: 0% to 100% PWM control
• Oscillation Frequency: 400kHz typ.
• Cycle-by-Cycle Current Limiting
• Thermal Shutdown
• Stable with Low ESR Output Ceramic Capacitors
• Built-in internal SW P-channel MOS
• Internal Soft-start function
• Under Voltage Lockout

Applications

• Distributed Power Systems
• DVD-Video Player
• Per-Regulator for Linear Regulator
• Telecom Equipment
• Microprocessor core supply
• LCD monitor and TV