Richtek RTQ2105

Description

The RTQ2105 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 wide switching frequency of 300kHz to 2200kHz allows for efficiency and size optimization when selecting the output filter components. The ultra-low minimum on-time enable constant-frequency operation even at very high stepdown ratios. For switching noise sensitive applications, it can be externally synchronized from 300kHz to 2200kHz. The optional spread-spectrum frequency modulation further helping systems designers with better EMC management. The RTQ2105 offers precise constant current and constant voltage regulation. It is ideally suited for USB power delivery or charging super-capacitors. For applications that use long cable, the RTQ2105 offers cable drop compensation as well to maintain accurate regulation at the end of the long cable. The RTQ2105 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 RTQ2105 is available in WETWQFN- 24SL 4x4 (W-Type) package.

Features

• 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 70mΩ Switch and 70mΩ SynchronousRectifier
• Low Quiescent Current : 40μA
• Fast 60ns Minimum Switch On-Time
• Ultra-Short 65ns Minimum Switch Off-Time
• Adjustable and Synchronizable Switching : 300kHzto 2.2MHz
• Selectable PSM/FPWM at Light Load
• Optional Spread-Spectrum Frequency Modulationfor Low EMI
• Externally Adjustable Soft-Start
• Power Good Indication
• Enable Control
• Adjustable Output Voltage with Cable DropCompensation
• Constant Current (CC) and Constant Voltage (CV)Regulation
• 0.8V ± 1.5% CV Reference Accuracy
• Adjustable Current Limit
• Adjacent Pin-Short Protection
• Built-In UVLO, UVP, OTP

Typical applications

• Broadband Communications
• Digital Set Top Boxes
• Point of Load Regulator in Distributed Power Systems / USB Power Chargers
• Automotive Systems / Car Camera Module and Car Cockpit Systems / Connected Car Systems

More information

• Datasheet
• IC product information