RT9209A

Features:

· Operates at 5V
· 0.8V Internal Reference
· Drives Two N-Channel MOSFET
· Voltage Mode PWM Control
· Fast Transient Response
· Fixed 260kHz/400kHz Oscillator Frequency
· Dynamic 0 to 100% Duty Cycle
· Internal PWM Loop Compensation
· Internal Soft-Start
· TOP VIEW
· Adaptive Non-Overlapping Gate Driver
· Over-Voltage Protection Uses Lower MOSFET
· RoHS Compliant and 100% Lead (Pb)-Free


Application

· Motherboard Power Regulation for Computers
· Subsystems Power Supplies
· Cable Modems, Set Top Box, and DSL Modems
· DSP and Core Communications processor Supplies
· Memory Power Supplies
· Personal Computer Peripherals
· Industrial Power Supplies
· 5V-Input DC-DC Regulators
· Low Voltage Distributed Power Supplies


Pinout




Specifications

` Supply Input Voltage, VCC--------------------------------------------------------------7V
` BOOT & UGATE to GND--------------------------------------------------------------- 19V
` Input, Output or I/O Voltage -------------------------------------------- GND-0.3V to 7V
` Power Dissipation, PD @ TA = 25°C
    SOP-8------------------------------------------------------------------------------0.625W
` Package Thermal Resistance
    SOP-8, JA ----------------------------------------------------------------------160°C/W
` Ambient Temperature Range ---------------------------------------------0°C to +70°C
` Junction Temperature Range --------------------------------------------0°C to +125°C
` Storage Temperature Range -----------------------------------------−65°C to +150°C
` Lead Temperature (Soldering, 10 sec.) --------------------------------------------260°C


Description

The RT9209/A is a single power supply PWM DC-DC converter controller designed to drive N-Channel MOSFET in a synchronous buck topology. The IC integrates the control, output adjustment, monitoring and protection functions into a small 8-pin package.

The RT9209/A uses an internal compensated voltage mode PWM control for simple application design. An internal 0.8V reference allows the output voltage to be precisely regulated to low voltage requirement. A fixed 260kHz/400kHz oscillator reduce the component size for saving board area.

The RT9209/A future a enable control pin to shutdown PWM switching and a 90% power good flag indicator. The FB pin under voltage detection function monitor the output short circuit which trigger a three time hiccup sequence to latch off the chip function.