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


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The RTQ2131B is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 1A output current from a 3V to 36V widely input supply. The RTQ2131B current-mode control with external compensation allows the transient response to be optimized over various loads and output capacitors. Cycle-by-cycle current limit provides protection against short-circuit output, and soft-start can eliminate input current surge during startup. Input under-voltage lockout, output under-voltage protection, over-current protection and over-temperature protection offers completely safe and smooth operation in all applied conditions. The RTQ2131B is fully specified over the temperature range of TA = -40°C to 125°C and is available in WDFN-10SL 3x3 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
Preset Vout (V)
Output Adj. Method Fixed;Resistor
Iout (max) (A) 1
Current Limit (typ) (A) 1.6
Freq (typ) (kHz) 2100
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No
Ron_HS (typ) (mOhm) 200
Ron_LS (typ) (mOhm) 160
Iq (typ) (mA) 1.1
Features AEC-Q100 Qualified;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;Power Good;UVP
Package Type WDFN3x3-10S
  • AEC-Q100 Grade 1 Qualified
  • 3V to 36V Input Voltage Range
  • Tight Switching Frequency Variation 2.1MHz ± 10% Over Operating Ambient Temperature
  • Built-In Spread-Spectrum Frequency Modulation
  • 5V Fixed Output Voltage ( see Ordering Information for availability)
  • 1A Output Current
  • -40°C to 125°C Operating Ambient Temperature Range
  • Current-Mode Control
  • Integrated 200mΩ/160mΩ MOSFETs
  • Stable with Low-ESR Ceramic Output Capacitors
  • Enable Control
  • Over-Temperature Protection
  • Output Under-Voltage Protection with Hiccup Mode
  • Adjacent Pin Short-Circuit Protection
  • Power-Good Indicator
  • Cycle-by-Cycle Over-Current Protection
  • Input Under-Voltage Lockout
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
1A, 36V, 2.1MHz Synchronous Step-Down Converter2018/04/13
Technical Documents
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Automotive Product Selection Guide2018/05/28
Reference Design
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Richtek Load Transient Tool2017/03/31
Design Tool
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Pspice: RTQ2131B-QA2018/07/02
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RTQ2131B-50GQW-QAWDFN3x3-10S1500 Request Buy from Distributor
RTQ2131BGQW-QAWDFN3x3-10S1500 Request Buy from Distributor