General Description
The RT6202A/B is a synchronous step-down DC/DC
converter with Advanced Constant On-Time (ACOT®) mode
control. It achieves high power density to deliver up to 5A
output current from a 4.5V to 18V input supply. The
proprietary ACOT® mode offers an optimal transient
response over a wide range of loads and all kinds of ceramic
capacitors, which allows the device to adopt very low ESR
output capacitor for ensuring performance stabilization. In
addition, RT6202A/B keeps an excellent constant
switching frequency under line and load variation and the
integrated synchronous power switches with the ACOT®
mode operation provides high efficiency in whole output
current load range. Cycle-by-cycle current limit provides
an accurate protection by a valley detection of low side
MOSFET and external soft-start setting eliminates input
current surge during startup. Protection functions include
thermal shutdown for RT6202A/B.
The RT6202A/B are available in the SOP-8 (Exposed Pad)
package.

Features
 ACOT® Mode Enables Fast Transient Response
 4.5V to 18V Input Voltage Range
 5A Output Current
 35mΩ Internal Low Side N-MOSFET
 Advanced Constant On-Time Control
 Support All Ceramic Capacitors
 Up to 95% Efficiency
 650kHz Switching Frequency at all Load Current
(RT6202B)
 Discontinuous Operating Mode at Light Load
(RT6202A)
 Adjustable Output Voltage from 0.765V to 8V
 Adjustable Soft-Start
 Cycle-by-Cycle Current Limit
 Input Under Voltage Lockout
 Thermal Shutdown
 RoHS Compliant and Halogen Free

Applications
 Industrial and Commercial Low Power Systems
 Computer Peripherals
 LCD Monitors and TVs
 Green Electronics/Appliances
 Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs