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8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO

RT6258B/RT6258C

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The RT6258B/C is an advanced constant on-time (ACOTTM) mode synchronous buck converter. The main control loop of the RT6258B/C using an advanced constant on-time (ACOTTM) mode control which provides a very fast transient response. The RT6258B operates from 4.5V to 23V input voltage and the RT6258C 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.
RT6258B RT6258C
Status Active Active
Vin (min) (V) 4.5 5.1
Vin (max) (V) 23 23
Number of Outputs 1 1
Vout (min) (V) 3.267 5.049
Vout (max) (V) 3.333 5.151
Output Adj. Method Fixed Fixed
Iout (max) (A) 8 8
Current Limit (typ) (A) 10.4 10.4
Freq (typ) (kHz) 500 750
Ext Sync No No
Ron_HS (typ) (mOhm) 20 20
Ron_LS (typ) (mOhm) 10 10
Iq (typ) (mA) 0.1 0.1
Features ACOT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control ACOT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control
Package Type UQFN3x3-12H(FC) UQFN3x3-12H(FC)
Features
  • 4.5V to 23V (RT6258B) and 5.1V to 23V (RT6258C) Input Voltage Range 8A Output Current
  • ACOTTM Mode Performs Fast Transient Response
  • ACOTTM Architecture to Enable All MLCC Output Capacitor Usage
  • Fixed 750kHz (RT6258C) and 500kHz (RT6258B) Switching Frequency
  • High Efficient Internal Power MOSFET Switch-
    20mΩ (High-Side) and 10mΩ (Low-Side)
  • Fixed 3.3V (RT6258B) and 5V (RT6258C) 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
8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO2018/05/23
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
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