RT9206 Electronic IC Chips linear integrated circuits DC/DC Converter

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RT9206

High Efficiency, Synchronous Buck with Dual Linear Controllers

General Description

The RT9206 is a low cost, combo power controller, which integrates a synchronous step-down voltage-mode PWM and two HV linear controllers. Directly drive external N-MOSFET makes it easy to implement a high efficiency and cost attractive power solution.

Voltage mode control loop and constant operation frequency with external compensation network provide better stability in wide operation range. Adjustable operation frequency up to 600kHz can minimize the inductor size and PCB space. It is particularly suitable in wide input voltage range (from 4.75Vto 28V) and multi-output applications.

Linear controller features flexible linear power design. Delivered power can be simply decided by external N-MOSFET selection. Output voltage level is chosen via external resistor divider. The 0.8V internal reference can satisfy most of the applications. Under voltage lockout provide cost effective protection of output.

RT9206 provides complete safety protection function: soft start, over current protection, over voltageandunder voltage protection. Set current limit by choosing different MOSFET. Synchronous Buck control mode provides excellent over voltage protection by turning on low side MOSFET to prevent any damage of end device from abnormal voltage stress as over voltage condition occurs.

Features

• Wide Input Range (4.75V to 28V)
• 0.8V Internal Reference
• High Efficiency Synchronous Buck Topology
• Integrate two HV Linear Controllers
• Low cost N-MOSFET Design

• Duty Cycle from 0%to 90%.
• Adjustable switching frequency from 200kHz to 600kHz, Default 200kHz
• Sense OCP by low Side MOSFET RDS(ON)
• Power Good Signal Output
• RoHS Compliant and 100% Lead (Pb)-Free

Applications

• LCD Monitor
• Desk Note  
• IEEE1394 Client
• Desktop IA
• Broadband

Absolute Maximum Ratings (Note 1)

Supply Voltage (VIN) ------------------------------------------------------------------------------------------------ -0.3 to 30V

PHS--------------------------------------------------------------------------------------------------------------------- -0.6V to 30V

PHS (PHS Transient Time Interval < 50ns) --------------------------------------------------------------------- -5V

BOOT, UG to PHS --------------------------------------------------------------------------------------------------- -0.3V to 7V

BOOT to GND -------------------------------------------------------------------------------------------------------- -0.3V to 35V

LDRI1, LDRI2 --------------------------------------------------------------------------------------------------------- -0.3V to 30V

Power Good Voltage------------------------------------------------------------------------------------------------- - 0.3V to 7V

The other pins -------------------------------------------------------------------------------------------------------- - 0.3V to 7V

Power Dissipation, PD @ TA = 25°C

    SOP-16 ------------------------------------------------------------------------------------------------------------------ 0.625W

Package Thermal Resistance

    SOP-16, θ_JA ----------------------------------------------------------------------------------------------------------- 90°C/W

Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C

Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------ 260°C

OperationTemperature Range------------------------------------------------------------------------------------- -20°C to 85°C

Storage Temperature Range -----------------------------------------------------------------------------------  -65°C to 150°C

ESD Susceptibility (Note 2)

    HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV

    MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V

Recommended Operating Conditions (Note 3)

Ambient Temperature Range ---------------------------------------------------------------------------------- 0°C to 70°C

Junction Temperature Range --------------------------------------------------------------------------------- 0°C to 125°C

Pin Configurations

Function Block Diagram