8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver


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The RT7258 is a synchronous step-down DC/DC converter with an integrated high side internal power MOSFET and a gate driver for a low side external power MOSFET. It can deliver up to 8A output current from a 4.5V to 24V input supply. The RT7258's current mode architecture allows the transient response to be optimized over a wider input voltage and load range. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT7258 is synchronizable to an external clock with frequency ranging from 300kHz to 1.5MHz.
The RT7258 is available in WDFN-14L 4x3 and SOP-8 (Exposed Pad) packages.


  • Point of Load Regulator in Distributed Power System
  • Digital Set top Boxes
  • Personal Digital Recorders
  • Broadband Communications
  • Flat Panel TVs and Monitors
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.808
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 8
Current Limit (typ) (A) 13
Freq (typ) (kHz) 600
Freq (min) (kHz) 300
Freq (max) (kHz) 1500
Ext Sync Yes
Ron_HS (typ) (mOhm) 45
Iq (typ) (mA) 0.9
Features Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;Internal Compensation;OCP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8;WDFN4x3-14
  • 4.5V to 24V Input Voltage Range
  • 8A Output Current
  • 45mΩ Internal High Side N-MOSFET
  • Current Mode Control
  • 600kHz Switching Frequency
  • Adjustable Output from 0.808V to 15V
  • Up to 95% Efficiency
  • Internal Compensation
  • Stable with Ceramic Capacitors
  • Synchronous External Clock : 300kHz to 1.5MHz
  • Cycle-by-Cycle Current Limit
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Power Good Indicator
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver2015/04/29
Title Last Update ShareDownload
8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1378
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7258GQWWDFN4x3-141500 Not available Buy from Distributor
RT7258GSPPSOP-82500 Not available Buy from Distributor