RT6280A数据手册Richtek中文资料规格书

描述 Description

The RT6280A/B is a simple, easy-to-use, 10A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 23V. The device build-in an accurate 0.6V reference voltage and integrates low R_DS(ON) power MOSFETs to achieve high efficiency in a UQFN-12HL 3x3 package. The RT6280A/B adopts Advanced Constant On-Time (ACOT^®) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT6280A/B operates in automatic PSM that maintains high efficiency during light load operation. The RT6280A/B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements. The RT6280A/B senses both FETs current for a robust over-current protection. It features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. A built-in soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, over-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. The RT6280A/B is offered in a UQFN-12HL 3x3 (FC) package.

特性 Features

•10A Converter With Built-in 20mΩ/10mΩ Low RDS(ON) Power FETs
•Input Supply Voltage Range : 4.5V to 23V
•Output Voltage Range : 0.6V to 6V
•Advanced Constant On-Time (ACOT®) Control
► Ultrafast Transient Response
► No Needs for External Compensations
► Optimized for Low-ESR Ceramic Output Capacitors
•0.6V ±1% High-Accuracy Feedback Reference Voltage
•Optional for Operation Modes :
► Power Saving Mode (PSM) (RT6280A)
► Forced PWM Mode (RT6280B)
•Fixed Switching Frequency : 500kHz
•Built-in Internally Fixed Soft-Start (Typ. 0.4ms)
•Input Under-Voltage Lockout (UVLO)
•Output Under-Voltage Protection (UVP) with Hiccup Mode
•Output Over-Voltage Protection (OVP) with Auto-Recovery Mode
•Ultrasonic Mode (USM) for RT6280A
•Available in UQFN-12HL 3x3 (FC) Package

应用 Application

• Industrial and Commercial Low Power Systems
• Computer Peripherals
• LCD Monitors and TVs
• Green Electronics/Appliances
• Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs
• Networking Communication