RT6206A

5.5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter

The RT6206A 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 5.5A 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, RT6206A 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 RT6206A.

The RT6206A are available in the TSSOP-14 (Exposed pad), SOP-8 (Exposed Pad) and WDFN-10L 3x3 packages.

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

Key Spec.
	RT6206A
Status	Active
Vin (min) (V)	4.5
Vin (max) (V)	18
Number of Outputs	1
Vout (min) (V)	0.765
Vout (max) (V)	7
Output Adj. Method	Resistor
Iout (max) (A)	5.5
Current Limit (typ) (A)	6.9
Freq (typ) (kHz)	650
Ext Sync	No
Ron_HS (typ) (mOhm)	80
Ron_LS (typ) (mOhm)	35
Iq (typ) (mA)	1
Features	ACOT Control;Adjustable Soft-Start;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8;TSSOP-14(PP);WDFN3x3-10

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
Advanced Constant On-Time Control
Support All Ceramic Capacitors
Up to 95% Efficiency
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

Datasheet
Title	Last Update	Download
5.5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter	2014/04/03

Technical Documents
Title	Item Type	Last Update
Richtek Product Selection Guide [Jan., 2024]	Selection Guide	2024/01/18
Richtek Featured Product Tree [Aug., 2023]	Selection Guide	2023/08/07
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator	App. Note	2015/12/03
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters [Oct., 2015]	Selection Guide	2015/10/02
Buck Converter Selection Criteria	App. Note	2015/05/01
Comparing Buck Converter Topologies	App. Note	2015/01/01
ACOT^® Stability Testing	App. Note	2013/11/01

Videos
Title	Last Update	Views
How to estimate control loop bandwidth from the transient response time?	2017/03/30	2015

Evaluation Boards
Title	Last Update	Download
RT6206AHGQW 5.5A, 18V, 650kHz, ACOT™ Synchronous Step-Down Converter	2021/01/21

Reference Design
Title	Last Update	Download
Richtek Load Transient Tool	2022/07/25

Part Number	Package Type	Package Qty.	Free Sample	Buy From Authorized Distributor
RT6206AHGQW	WDFN3x3-10	1500	Request	Buy from Distributor
RT6206AHGSP	PSOP-8	2500	Request	Buy from Distributor

Please confirm with our distributor or sales representative for actual stock status.