F72815
1. General Description
The F72815 is a high-efficiency synchronous buck PWM controller with an adjustable reference voltage input to
provide an option for over voltage function, which 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.
2. Feature List
Provides one synchronous rectified buck DC-DC PWM controller
Fast transient response (high bandwidth error amplifier; full 0~100% duty cycle)
Fixed operation frequency : 300KHz
Single loop voltage-mode control
Few external components
Output range adjustable down to 0.8V
Operates under 5V to 12V input
Drives all low cost N-channel MOSFETs
Uses MOSFET R
DS(ON)
as over current monitor, 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
Adjustable Reference Voltage Input for Over Voltage Function, Input Range: 0.78~1.2V, Enable Level: under 1.5V
8-SOP package (150 mil)
F72815
-1-
Aug, 2007
V0.14
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
