RT9202

Features:

·Operate from 5V
·0.8V Internal Reference
·Drive Two N-channel MOSFET
·Voltage Mode PWM Control
·Fast Transient Response
·Fixed 300kHz Oscillator Frequency
·Full 0~100% Duty Cycle
·Internal Soft Start
·Adaptive Non-overlapping Gate Driver
·Over-current Monitor Uses MOSFET RDS(ON)
·Over-voltage Protection Uses Low-side MOSFET




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



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Specifications

􀁺 Supply Voltage VCC ...................................................7V
􀁺 BOOT & UGATE to GND .............................................15V
􀁺 Input, Output or I/O Voltage................. GND−0.3V ~ 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 ~ +70°C
􀁺 Junction Temperature Range .............-40°C ~ +125°C
􀁺 Storage Temperature Range .............-65°C ~ +150°C
􀁺 Lead Temperature (Soldering, 10 sec.) ..............260°C
CAUTION: Stresses beyond the ratings specified in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Description

The RT9202 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 in a small 8-pin package.

The RT9202 uses a low gain 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 300kHz oscillator reduces the component size for saving board space.

The RT9202 features over current protection, over voltage protection, and under voltage lock-out. The output current is monitored by sensing the voltage drop across the MOSFET's RDS(ON), which eliminates the need for a current sensing resistor.

The RT9202 uses a low gain 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 300kHz oscillator reduces the component size for saving board space.

The RT9202 features over current protection, over voltage protection, and under voltage lock-out. The output current is monitored by sensing the voltage drop across the MOSFET's R_DS(ON), which eliminates the need for a current sensing resistor.