器件名称: ILC6377
功能描述: 0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
文件大小: 114.93KB 共12页
简 介:www.fairchildsemi.com
ILC6376/77
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
Features
±2.5% accurate output voltages Guaranteed 500mA output current 95% efficiency 55A no load battery input current (ILC6377) 1.5A shutdown current Built in short circuit and overcurrent protection Undervoltage lockout and soft-start External transistor drive available for higher IOUT 300kHz operation Automatic switchover to PFM mode at low currents for longest battery life (ILC6377) Fixed 3.3V or 5V or adjustable output SO-8 package
Description
The ILC6376/77 is a 95% efficient, 300kHz step-down DCDC converter in an SO-8 package; capable of delivering 500mA output current. The device is also capable of driving an external FET for higher output current applications.
The ILC6376/77 uses a unique p-channel architecture with built-in charge pump to maintain low on-resistance, even at low input voltages. The ILC6376 operates in PWM mode with 300kHz switching frequency. The ILC6377 does the same at high and medium load currents. When the load current drops and the device hits approximately 25% duty cycle, ILC6377 automatically switches over to PFM or pulse skipping mode. PFM (pulse frequency modulation) mode of operation extends efficiency at light loads. Start-up is controlled via an external soft-start capacitor. The device will automatically re-enter start-up mode when an output current overload condition is sensed; thus providing automatic short-circuit protection.……
