F72814中文资料Switching数据手册FINTEK规格书

描述 Description

The F72814 is a high-efficiency synchronous buck PWM controller that generates logic-supply voltages in PC based systems. This high-performance , single output device includes internal soft-start, frequency-compensation networks, power good signal with delay, and integrates all of the control, output adjustment, monitoring and protection functions into a single package. This device operates at a fixed frequency, 300K Hz and provides an optimum compromise between efficiency, external component size, and cost. Adjustable over-current protection (OCP) monitors the voltage drop across the RDS (ON) of the lower MOSFET for synchronous buck PWM DC-DC controller. The over-current function cycles the soft-start in 4-times hiccup mode to provide fault protection, and in a routine hiccup mode for under-voltage protection.(1)(1)

特性 Features

Provides one synchronous rectified buck DC-DC PWM controller
-  Fast transient response (high bandwidth error amplifier; full 0~80% duty cycle)
-  Fixed operation frequency : 300KHz
-  Single loop voltage-mode control
-  Few external components
-  Output range adjustable down to 0.8V
Operatesunder 5V to 12V input
Drives all low cost N-channel MOSFETs
Uses MOSFET RDS(ON) as over currentmonitor, and no current sense resistor is required
0.8V internal reference voltage
 -  ±2% accuracy over line, load and temperature
Internal soft-start (typically 3 ms)
Internal loop compensation
Under voltage fault monitoring and protection
Over voltage protection
Adaptive Non-Overlapping Gate Driver
8-SOP package (150 mil)
8-SOP Green Package