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The RT7274/79/80/81 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 2A 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, RT7274/79/80/81 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 RT7274/79/80/81; output under voltage protection and output over voltage protection for RT7279/80 only.

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.
RT7274 RT7279 RT7280 RT7281
Status Active Active Active Active
Vin (min) (V) 4.5 4.5 4.5 4.5
Vin (max) (V) 18 18 18 18
Number of Outputs 1 1 1 1
Vout (min) (V) 0.765 0.765 0.765 0.765
Vout (max) (V) 8 8 8 8
Output Adj. Method Resistor Resistor Resistor Resistor
Iout (max) (A) 2 2 2 2
Current Limit (typ) (A) 3.5 3.5 3.5 3.5
Freq (typ) (kHz) 700 700 700 700
Ext Sync No No No No
Ron_HS (typ) (mOhm) 150 150 150 150
Ron_LS (typ) (mOhm) 105 105 105 105
Iq (typ) (mA) 0.7 0.7 0.7 0.7
Features ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8 TSSOP-14(PP);WDFN3x3-10 TSSOP-14(PP);WDFN3x3-10 PSOP-8
Features
  • ACOTTM Mode Enables Fast Transient Response
  • 4.5V to 18V Input Voltage Range
  • 2A Output Current
  • High Efficient Internal N-MOSFET Optimized for Lower Duty Cycle Applications
  • 105mΩ Internal Low-Side N-MOSFET
  • Advanced Constant On-Time Control
  • Allows Ceramic Output Capacitor
  • 700kHz Switching Frequency
  • Adjustable Output Voltage from 0.765V to 8V
  • Adjustable and Pre-biased Soft-Start
  • Cycle-by-Cycle Current Limit
  • Input Under Voltage Lockout
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
Evaluation Boards
TitleLast UpdateDownload
RT7280GQW Evaluation Board2021/01/21
RT7279GQW Evaluation Board2021/01/21
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT7274GSPPSOP-82,500 Request Digikey 458 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7279GCPTSSOP-14(PP)2,500 Request Digikey 351 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7279GQWWDFN3x3-101,500 Request Digikey 25,413 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7280GQWWDFN3x3-101,500 Request Digikey 957 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7281GSPPSOP-82,500 Request Digikey 2,397 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT7279GQW Digikey 2 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
EVB_RT7280GQW Digikey 5 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.
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