2A, 24V, 800kHz, ACOT® Step-Down Converter


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The RT6215F is a high-efficiency, synchronous step-down DC-DC converter that can deliver up to 2A output current from a 4.5V to 24V input supply. The RT6215F adopts Advanced Constant On-Time (ACOT®) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over line, load, and output voltage ranges.

The RT6215F features cycle-by-cycle current limit protection against short-circuit outputs, and soft-start function to prevent inrush current during start-up. It also includes input under-voltage lockout, output under-voltage protection, over-current protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions.


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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
Current Limit (typ) (A) 2.7;5
Freq (typ) (kHz) 800
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 85
Iq (typ) (mA) 0.17
Features ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;SCP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type TSOT-28(FC)
  • Input Supply Voltage Range : 4.5V to 24V
  • Output Current : 2A
  • Internal 100mΩ Switch and 85mΩ Synchronous Rectifier
  • Advanced Constant On-Time (ACOTTM) Control for Ultrafast Transient Response
  • Steady Switching Frequency : 800kHz
  • Optimized for Low-ESR Ceramic Output Capacitors
  • 0.791V ±1.5% High-Accuracy Feedback Reference Voltage
  • Programmable Output Voltage : 0.791V to 6V
  • Monotonic Start-up for Pre-Biased Outputs
  • Enable Control
  • Cycle-by-Cycle Current Limit Protection
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Over-Temperature Protection (OTP) (Thermal Shutdown)
  • Available in TSOT-23-8 (FC) Package
TitleLast UpdateShareDownload
2A, 24V, 800kHz, ACOT® Step-Down Converter2018/10/05
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09