General Description
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.

Applications
 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

Features
 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