1A, 36V, 2.1MHz Synchronous Step-Down Converter


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The RTQ2131B is a 1A, high-efficiency, current mode synchronous step-down converter which is optimized for automotive applications. The device operates with input voltages from 3V to 36V and is protected from load dump transients up to 42V, eases input surge protection design. The device can program the output voltage between 0.8V to VIN. The peak current mode control with simple external compensation allows the use of small inductors and results in fast transient response and good loop stability.

The RTQ2131B provides complete protection functions such as input under voltage lockout, output under voltage protection, over current protection, and thermal shutdown. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RTQ2131B is available in WDFN-10SL 3x3 (Exposed Pad) package.


  • Automotive Systems
  • Car Camera Module and Car Cockpit Systems
  • Connected Car Systems
  • Point of Load Regulator in Distributed Power Systems
  • Digital Set Top Boxes
  • Broadband Communications
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 36
Output Adj. Method Fixed;Resistor
Iout (max) (A) 1
Current Limit (typ) (A) 1.6
Freq (typ) (kHz) 2100
Ext Sync No
Ron_HS (typ) (mOhm) 200
Ron_LS (typ) (mOhm) 160
Iq (typ) (mA) 1.1
Features 100% Duty Cycle;AEC-Q100 Qualified;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;OTP;Power Good;UVP
Package Type WDFN3x3-10S
  • AEC-Q100 Grade 1 Qualified
  • Wide Input Voltage Range
    ► 4V to 36V
    ► 3V to 36V (Soft-start is finished)
  • Tight Switching Frequency Variation 2.1MHz ±10% Over Operating Ambient Temperature
  • Wide Output Voltage Range : 0.8V to VIN
  • 5V Fixed Output Voltage ( see Ordering Information for availability)
  • Maximum Output Current : 1A
  • Peak Current Mode Control
  • Integrated 200mΩ Switch and 160mΩ Synchronous Rectifier
  • Built-In Spread-Spectrum Frequency Modulation for Low EMI
  • Power Good Indication
  • Enable Control
  • 0.8V ±1.5% Reference Voltage Accuracy
  • Adjacent Pin-Short Protection
  • Built-In UVLO, UVP, OTP
TitleLast UpdateShareDownload
1A, 36V, 2.1MHz Synchronous Step-Down Converter2018/03/06
Technical Documents
TitleLast UpdateShareDownload
Automotive Product Selection Guide2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Design Tool
TitleLast UpdateShare
Pspice: RTQ2131B-QA2020/09/23
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RTQ2131BGQW-QAWDFN3x3-10S1500 Not available Buy from Distributor