RT6278BHGQUF

The RT6278A/B is a simple, easy-to-use, 8A 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 RDS(ON) power MOSFETs to achieve high efficiency in a UQFN-12HL 3×3 package. The RT6278A/B adopts Advanced Constant OnTime (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 RT6278A operates in automatic PSM that maintains high efficiency during light load operation. The RT6278B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements. The RT6278A/B senses both FETs current for a robust over-current protection. It features cycle-bycycle 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 RT6278A/B is offered in a UQFN-12HL 3x3(FC) package.

Applications

• 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

Key features

• 8A Converter With Built-In 24mΩ/12mΩ 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) (RT6278A)
• Forced PWM Mode (RT6278B)
• 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 AutoRecovery Mode
• Ultrasonic Mode (USM) for RT6278A
• Available In UQFN-12HL 3x3 (FC) (U-Type) Package