loading

6A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO

RT6256BH/RT6256CH

Update Alert Share

The RT6256BH/CH is an advanced constant on-time (ACOT®) mode synchronous buck converter. The main control loop of the RT6256BH/CH using an advanced constant on-time (ACOT®) mode control which provides a very fast transient response. The RT6256BH operates from 4.5V to 23V input voltage and RT6256CH operates from 5.1V to 23V.

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.
RT6256BH RT6256CH
Status Active Active
Vin (min) (V) 4.5 5.1
Vin (max) (V) 23 23
Vout (min) (V) 3.267 5.049
Vout (max) (V) 3.333 5.151
Output Adj. Method Fixed Fixed
Iout (max) (A) 6 6
Current Limit (typ) (A) 8.4 8.4
Freq (typ) (kHz) 500 750
Ext Sync No No
Ron_HS (typ) (mOhm) 30 30
Ron_LS (typ) (mOhm) 15 15
Iq (typ) (mA) 0.1 0.1
Features ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control ACOT Control;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control
Package Type UQFN3x3-12H(FC) UQFN3x3-12H(FC)
Features
  • 4.5V to 23V (RT6256BH) and 5.1V to 23V (RT6256CH) Input Voltage Range 6A Output Current
  • ACOT® Mode Performs Fast Transient Response
  • ACOT® Architecture to Enable All MLCC Output Capacitor Usage
  • Fixed 750kHz (RT6256CH) and 500kHz (RT6256BH) Switching Frequency
  • High Efficient Internal Power MOSFET Switch-
    30mΩ (High-Side) and 15mΩ (Low-Side)
  • Fixed 3.3V (RT6256BH) and 5V (RT6256CH) LDOs Output Supply 100mA
  • Pre-biased Soft-Start
  • Cycle-by-Cycle Over-Current Protection
  • Input Under-Voltage Lockout
  • Thermal Shutdown Protection
  • Output Over-/Under-Voltage Protection
  • Ultrasonic Mode (USM)
Datasheet
TitleLast UpdateShareDownload
6A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO2017/06/22
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
TOP