RTQ2949-QA中文资料42VIN, 3A, Asynchronous Step-Down Converter with Low Quiescent Current数据手册Richtek规格书

描述 Description

The RTQ2949 is a 3A, high-efficiency, peak current mode control asynchronous step-down converter. The device operates with input voltages from 4V to 42V which is optimized for automotive applications. The device can program the output voltage between 0.8V to VIN and is protected from load dump transients up to 65V which eases input surge protection design. The low quiescent current design with the integrated low R_DS(ON) of high-side MOSFET 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 100kHz to 2500kHz allows for efficiency and size optimization when selecting the output filter components. The ultra-low minimum on-time enables 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 system designers with better EMC management.



The RTQ2949 provides complete protection functions such as input under-voltage lockout, output under-voltage protection, output over-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 RTQ2949 is available in SOP-8 (Exposed pad) package.

特性 Features

•AEC-Q100 Grade 1 Qualified
•Wide Input Voltage Range
•Wide Output Voltage Range : 0.8V to VIN
•Peak Current Mode Control
•Low Quiescent Current : 90μA
•Adjustable Switching : 100kHz to 2.5MHz
•Power Saving Mode (PSM) at Light Load
•Low Dropout at Light Loads with Integrated Boot Recharge FET
•Adjustable UVLO Voltage and Hysteresis
•Built-In UVLO, UVP, OVP, OCP, OTP

应用 Application

• Automotive, Communications and Industrial 12V, 24V Power Systems
• Vehicle Accessories : GPS, Entertainment
• USB Charging Ports and Battery Chargers