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1.5A, 18V, 500kHz ACOT™ Synchronous Step-Down Converter

RT7285B

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The RT7285B is a synchronous step-down converter with Advanced Constant On-Time (ACOTTM) mode control. The ACOTTM 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 RT7285B 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.
RT7285B
Status Active
Vin (min) (V) 4.3
Vin (max) (V) 18
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 8
Output Adj. Method Resistor
Iout (max) (A) 1.5
Current Limit (typ) (A) 2.2
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 230
Ron_LS (typ) (mOhm) 130
Iq (typ) (mA) 0.5
Features ACOT Control;Fast Transient Response;OCP;PSM;Stable with Ceramic Capacitor;UVP
Package Type 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
  • Thermal Shutdown
  • Power Saving Mode for High Efficiency at Light Load
Datasheet
TitleLast UpdateShareDownload
1.5A, 18V, 500kHz ACOT™ Synchronous Step-Down Converter2014/01/13
Technical Documents
TitleLast UpdateShareDownload
ACOT™ Stability Testing2019/03/18
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2018/11/15
Comparing Buck Converter Topologies2018/09/20
Buck Converter Selection Criteria2016/08/04
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2016/07/07
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 628
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT7285BGJ62019/09/11
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