1.5A, 17V, 340/800kHz Synchronous Step-Down Converter


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The RT8297A/B is a high efficiency, monolithic synchronous step-down DC-DC converter that can operate at 340kHz/800kHz, while delivering up to 1.5A output current from a 4V to 17V input supply. The RT8297A/B's current mode architecture allows the transient response to be optimized. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over voltage protection, and thermal shutdown. The low current (<5μA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT8297A/B is available in a WDFN-8L 2x2 package.


  • 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.
RT8297A RT8297B
Status Active Active
Vin (min) (V) 4 4
Vin (max) (V) 17 17
Number of Outputs 1 1
Vout (min) (V) 0.8 0.8
Vout (max) (V) 12 12
Output Adj. Method Resistor Resistor
Iout (max) (A) 1.5 1.5
Current Limit (typ) (A) 3 3
Freq (typ) (kHz) 340 800
Ext Sync No No
Ron_HS (typ) (mOhm) 145 145
Ron_LS (typ) (mOhm) 140 140
Iq (typ) (mA) 0.6 0.6
Features Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;OVP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WDFN2x2-8 WDFN2x2-8
  • 4V to 17V Input Voltage Range
  • 1.5A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Fixed Frequency Operation : 340kHz/800kHz
  • Output Adjustable from 0.8V to 12V
  • Up to 95% Efficiency
  • Internal Compensation
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Output Over Voltage Protection
  • Power Good Indicator
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
1.5A, 17V, 340/800kHz Synchronous Step-Down Converter2011/03/14
Title Last Update ShareDownload
1.5A, 17V, 340/800kHz Synchronous Step-Down Converter 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Analyzing VIN overstress in Power ICs2019/12/12
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1363
Evaluation Boards
TitleLast UpdateShareDownload
RT8297BZQW Evaluation Board2021/01/21
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8297AZQWWDFN2x2-82500 Request Buy from Distributor
RT8297BZQWWDFN2x2-82500 Request Buy from Distributor