F72814 参数 Datasheet PDF下载

F72814

1. General 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.

2. Feature List

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

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

8-SOP package (150 mil)

F72814

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V0.23P