2.5A, 24V, 500kHz, ACOT® Step-Down Converter


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The RT6216E is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 2.5A output current from a 4.5V to 24V input supply. The RT6216E adopts ACOT® architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection and thermal shutdown.


  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV
  • Notebook Systems and I/O Power
  • Flat Panel Television and Monitors
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.791
Vout (max) (V) 6
Output Adj. Method Resistor
Iout (max) (A) 2.5
Current Limit (typ) (A) 3.2
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 85
Ron_LS (typ) (mOhm) 40
Iq (typ) (mA) 0.15
Features ACOT Control;PSM;UVP
Package Type TSOT-28(FC)
  • Integrated 85mΩ /40mΩ MOSFETs
  • 4.5V to 24V Supply Voltage Range
  • 500kHz Switching Frequency
  • ACOTTM Control
  • 0.791V ± 1.5% Voltage Reference
  • Monotonic Start-Up into Pre-biased Outputs
  • Output Adjustable from 0.791V to 6V
  • Compact Package : TSOT-23-8 (FC)
TitleLast UpdateShareDownload
2.5A, 24V, 500kHz, ACOT® Step-Down Converter2015/11/18
Technical Documents
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ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2020/12/30
ACOT® Stability Testing2020/04/13
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2019/12/12
Comparing Buck Converter Topologies2019/12/12
Buck Converter Selection Criteria2019/12/12
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1379
Reference Design
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Richtek Load Transient Tool2021/01/21