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3A, 30V, 500kHz Synchronous Step-Down Converter

RT6283B

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The RT6283B is a high efficiency, current mode synchronous step-down DC-DC converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 30V. The device integrates a 150mΩ high side and a 80mΩ low side MOSFET to achieve high conversion efficiency up to 95%. The current mode control architecture supports fast transient response and simple compensation circuit.

A cycle-by-cycle current limit function provides protection against shorted output and an internal soft-start eliminates input current surge during start-up. The RT6283B provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and thermal shutdown.

The RT6283B is available in the thermal enhanced SOP-8 (Exposed Pad) package.

Applications

  • Distributed Power Systems
  • Pre-Regulator for Linear Regulators
  • Notebook Computers
  • Point of Load Regulator in Distributed Power System
  • Digital Set-top Boxes
  • Personal Digital Recorders
  • Broadband Communications
  • Flat Panel TVs and Monitors
  • Vehicle Electronics
Key Spec.
RT6283B
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 30
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 24
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.5
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 150
Ron_LS (typ) (mOhm) 80
Iq (typ) (mA) 0.9
Features Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
Features
  • 4.5V to 30V Input Voltage Range
  • 3A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Fixed Frequency Operation : 500kHz
  • Adjustable Output Voltage from 0.8V to 24V
  • High Efficiency Up to 95%
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Current Limit
  • Input Under-Voltage Lockout
  • Output Under-Voltage Protection
  • Thermal Shutdown Protection
  • Adjustable Current Limit
  • Power Saving Mode for High Efficiency at Light Load
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
3A, 30V, 500kHz Synchronous Step-Down Converter2019/12/16
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
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