®
RT6206B
5.5A, 18V, 650kHz, ACOT
TM
Synchronous Step-Down Converter
General Description
The RT6206B is a synchronous step-down DC-DC converter
with Advanced Constant On-Time (ACOT
TM
) mode control.
It achieves high power density to deliver up to 5.5A output
current from a 4.5V to 18V input supply. The proprietary
ACOT
TM
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, RT6206B keeps an excellent constant switching
frequency under line and load variation and the integrated
synchronous power switches with the ACOT
TM
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 RT6206B.
The RT6206B are available in the TSSOP-14 (Exposed
pad), SOP-8 (Exposed Pad) and WDFN-10L 3x3
packages.
Features
ACOT
TM
Mode Enables Fast Transient Response
4.5V to 18V Input Voltage Range
5.5A Output Current
35mΩ Internal Low-Side N-MOSFET
Ω
Advanced Constant On-Time Control
Support All Ceramic Capacitors
Up to 95% Efficiency
Discontinuous Operating Mode at Light Load
Adjustable Output Voltage from 0.765V to 7V
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
Simplified Application Circuit
RT6206B
V
IN
VIN
VINR*
Enable
Power Good
EN
PGOOD*
VREG5
GND*
SW
BOOT
FB
SS
V
OUT
PGND
* : VINR, GND pin for TSSOP-14 (Exposed Pad) only.
* : PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6206B-02 March 2017
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
