RT7266

3A, 18V, 700kHz ACOT® Synchronous Step-Down Converter

The RT7266 is an adaptive on-time ACOT® mode synchronous buck converter. The adaptive on-time ACOT® mode control provides a very fast transient response with few external components. The low impedance internal MOSFET can support high efficiency operation with wide input voltage range from 4.5V to 18V . The proprietary circuit of the RT7266 enables to support all ceramic capacitors. The output voltage can be adjustable between 0.765V and 8V. The soft-start is adjustable by an external capacitor.

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.
	RT7266
Status	Active
Vin (min) (V)	4.5
Vin (max) (V)	18
Number of Outputs	1
Vout (min) (V)	0.765
Vout (max) (V)	8
Output Adj. Method	Resistor
Iout (max) (A)	3
Current Limit (typ) (A)	4.1
Freq (typ) (kHz)	700
Ext Sync	No
Ron_HS (typ) (mOhm)	90
Ron_LS (typ) (mOhm)	60
Iq (typ) (mA)	0.7
Features	ACOT Control;Adjustable Soft-Start;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8

Features

ACOT^TM Mode Enables Fast Transient Response
4.5V to 18V Input Voltage Range
3A Output Current
60mΩ Internal Low Site N-MOSFET
Adaptive On-Time Control
Fast Transient Response
Support All Ceramic Capacitors
Up to 95% Efficiency
700kHz Switching Frequency
Adjustable Output Voltage from 0.765V to 8V
Adjustable Soft-Start
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Thermal Shutdown Protection
RoHS Compliant and Halogen Free

Datasheet
Title	Version	Last Update	Download
RT7266: 3A, 18V, 700kHz ACOT® Synchronous Step-Down Converter	V3.0	2011/11/16

Technical Documents
Title	Item Type	Last Update
Richtek Product Selection Guide [Jan., 2024]	Selection Guide	2024/01/18
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	2600

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

Part Number	Package Type	Package Qty.	Free Sample	Distributor	Stock	Buy From Authorized Distributor
RT7266ZSP	PSOP-8	2,500	Request	Digikey	2,694	Buy
				Mouser	Lead-Time: 14 weeks	Not Available
				WPG	Lead-Time: 14 weeks	Not Available

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