The RT2875D is a high efficiency, current-mode synchronous DC-DC step-down converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 36V. The device integrates 95mΩ high-side and 70mΩ low-side MOSFETs to achieve high conversion efficiency. The current-mode control architecture supports fast transient response and simple external compensation. A cycle-by-cycle current limit function provides protection against shorted output and an external soft-start eliminates input current surge during start-up. The RT2875D provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and thermal shutdown.

The RT2875D is available in the thermal enhanced TSSOP-14 (Exposed Pad) package.


  • Point of Load Regulator in Distributed Power Systems
  • Digital Set Top Boxes
  • Broadband Communications
  • Vehicle Electronics
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 24
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.5
Freq (min) (kHz) 300
Freq (max) (kHz) 2100
Ext Sync Yes
Ron_HS (typ) (mOhm) 95
Ron_LS (typ) (mOhm) 70
Iq (typ) (mA) 1.3
Features AEC-Q100;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type TSSOP-14(PP)
  • 3A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Adjustable Switching Frequency : 300kHz to 2.1MHz
  • Adjustable Current Limit : 1.5A to 6A
  • Synchronous to External Clock : 300kHz to 2.1MHz
  • Adjustable Output Voltage from 0.6V 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
  • 0.6V ± 1% Reference Voltage Over Temperature
  • Thermal Shutdown
  • AEC-Q100 Grade 2 Qualified
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
3A, 36V, Synchronous Step-Down Converter2023/09/05
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25