36VIN, 3A, High Efficiency, 2.1MHz, Synchronous Step-Down Converter with Low Quiescent Current


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The RTQ2106 is a 3A, 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 low quiescent current design with the integrated low RDS(ON) power MOSFETs achieves high efficiency over the wide load range. 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 ultra-low minimum on-time enable constant-frequency operation even at very high step down ratios. For switching noise sensitive applications, it can be externally synchronized from 300kHz to 2200kHz. The build-in spread-spectrum frequency modulation further helping systems designers with better EMC management.

The RTQ2106 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 RTQ2106 is available in TSSOP-14 (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) 28
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 2.2;5.5
Freq (typ) (kHz) 2100
Ext Sync Yes
Ron_HS (typ) (mOhm) 90
Ron_LS (typ) (mOhm) 90
Iq (typ) (mA) 0.04
Features 100% Duty Cycle;AEC-Q100 Qualified;Adjustable Current Limit;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;OCP;OTP;Power Good;Selectable (PSM or PWM);UVP
Package Type TSSOP-14(PP)
  • AEC-Q100 Grade 1 Qualified
  • Wide Input Voltage Range
    ► 4V to 36V
    ► 3V to 36V (Soft-start is finished)
  • Wide Output Voltage Range : 0.8V to VIN
  • Maximum Output Current : 3A
  • Peak Current Mode Control
  • Integrated 90mΩ Switch and 90mΩ Synchronous Rectifier
  • Low Quiescent Current : 40μA
  • Fast 60ns Minimum Switch On-Time
  • Ultra-Short 65ns Minimum Switch Off-Time
  • Synchronizable Switching : 300kHz to 2.2MHz
  • Selectable PSM/FPWM at Light Load
  • Built-In Spread-Spectrum Frequency Modulation for Low EMI
  • Externally Adjustable Soft-Start
  • Power Good Indication
  • Enable Control
  • 0.8V ±1.5% Reference Accuracy
  • Adjustable Current Limit
  • Adjacent Pin-Short Protection
  • Built-In UVLO, UVP, OTP
TitleLast UpdateShareDownload
36VIN, 3A, High Efficiency, 2.1MHz, Synchronous Step-Down Converter with Low Quiescent Current2018/11/01
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Design Tool
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Pspice: RTQ2106-QA2020/02/05