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3A, 18V, 800kHz Synchronous Step-Down Converter

RT7297C

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The RT7297C is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT7297C's current mode architecture and external compensation allow the transient response to be optimized over a wide input voltage range and loads. Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start-up. The RT7297C also provides under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7297C is available in an SOP-8 (Exposed Pad) package.

Applications

  • Wireless AP/Router
  • Set-Top-Box
  • Industrial and Commercial Low Power Systems
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation of High-Performance DSPs
Key Spec.
RT7297C
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 18
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 12
Preset Vout (V)
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.1
Freq (typ) (kHz) 800
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No
Ron_HS (typ) (mOhm) 110
Ron_LS (typ) (mOhm) 90
Iq (typ) (mA) 0.8
Features Adjustable Soft-Start;Current Mode Control;Enable Input;Force PWM;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
Features
  • ±1.5% High Accuracy Reference Voltage
  • 4.5V to 18V Input Voltage Range
  • 3A Output Current
  • Integrated N-MOSFET Switches
  • Current Mode Control
  • Fixed Frequency Operation : 800kHz
  • Output Adjustable from 0.8V to 12V
  • Up to 95% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Current Limit
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
3A, 18V, 800kHz Synchronous Step-Down Converter2012/03/19
Technical Documents
TitleLast UpdateShareDownload
Reducing EMI in buck converters2017/11/07
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 542
Evaluation Boards
TitleLast UpdateShareDownload
RT7297CHZSP Evaluation Board2018/11/01
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2018/11/01
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT7297CHZSP2019/04/16
Richtek Designer™ Web Simulation Tool : RT7297CLZSP2019/04/16
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7297CHZSPPSOP-82500 Not available Buy from Distributor
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