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The RT7285/A is a synchronous step-down converter with Advanced Constant On-Time (ACOT®) mode control. The ACOT® provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.3V to 18V. The proprietary circuit of the RT7285/A enables to support all ceramic capacitors. The output voltage can be adjusted between 0.6V and 8V.

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.
RT7285 RT7285A
Status Active Active
Vin (min) (V) 4.3 4.3
Vin (max) (V) 18 18
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 8 8
Output Adj. Method Resistor Resistor
Iout (max) (A) 1.5 1.5
Current Limit (typ) (A) 2.2 2.2
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 230 230
Ron_LS (typ) (mOhm) 130 130
Iq (typ) (mA) 0.5 0.5
Features ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type SOT-26;TSOT-26 SOT-26;TSOT-26
Features
  • 4.3V to 18V Input Voltage Range
  • 1.5A Output Current
  • Advanced Constant On-Time Control
  • Fast Transient Response
  • Support All Ceramic Capacitors
  • Up to 95% Efficiency
  • 500kHz Switching Frequency
  • Adjustable Output Voltage from 0.6V to 8V
  • Cycle-by-Cycle Current Limit
  • Input Under-Voltage Lockout
  • Hiccup Mode Under-Voltage Protection
  • Thermal Shutdown
  • Power Saving Mode for High Efficiency at Light Load
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateDownload
1.5A, 18V, 500kHz ACOT® Synchronous Step-Down Converter2014/01/13
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
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