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3A, 23V, 340kHz Synchronous Step-Down Converter

RT8250

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The RT8250 is a high-efficiency synchronous step-down DC/DC converter that can deliver up to 3A output current from 4.5V to 23V input supply. The RT8250's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT8250 also provides output under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems.

Applications

  • Industrial and Commercial Low Power Systems
  • Computer Peripherals
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation of High-Performance DSPs, FPGAs and ASICs.
Key Spec.
RT8250
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 23
Number of Outputs 1
Vout (min) (V) 0.925
Vout (max) (V) 20
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.5
Freq (typ) (kHz) 340
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 85
Iq (typ) (mA) 0.7
Features Adjustable Soft-Start;Current Mode Control;Enable Input;Force PWM;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
Features
  • 4.5V to 23V Input Voltage Range
  • 1.5% High Accuracy Feedback Voltage
  • 3A Output Current
  • Integrated N-MOSFET Switches
  • Current Mode Control
  • Fixed Frequency Operation : 340kHz
  • Output Adjustable from 0.925V to 20V
  • Up to 95% Efficiency
  • Programmable Soft-Start
  • Stable with Low-ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection
  • Thermally Enhanced SOP-8 (Exposed Pad) Package
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
3A, 23V, 340kHz Synchronous Step-Down Converter2010/03/29
Reliability
Title Last Update ShareDownload
3A, 23V, 340kHz Synchronous Step-Down Converter 2015/05/19
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1105
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
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