DESCRIPTION

The NB670 is a fully integrated high frequency synchronous rectified step-down switch mode converter with 3.3V fixed output voltage. It offers very compact solution to achieve 6A continuous output current and 9A peak output current over a wide input supply range with excellent load and line regulation. The NB670 operates at high efficiency over a wide output current load range. Constant-On-Time (COT) control mode provides fast transient response and eases loop stabilization.

Under voltage lockout is internally set as 4.65 V. An open drain power good signal indicates the output is within its nominal voltage range.

NB670 also provides a 3.3V LDO, which can be used to power the external peripheries, such as the keyboard controller in the laptop computer. A 300kHz CLK is also available; its output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main converter’s efficiency.

Full protection features include OCP, OVP, UVP and thermal shut down.

The converter requires minimum number of external components and is available in QFN16 (3mmx3mm) package.

FEATURES

• Wide 5V to 24V Operating Input Range

• 3.3V Fixed Output Voltage

• Built-in 3.3V, 100mA LDO with Switches

• 6A Continuous Output Current

• 9A Peak Output Current

• 300kHZ CLK for External Charge Pump

• Low RDS(ON) Internal Power MOSFETs

• Proprietary Switching Loss Reduction Technique

• Internal Soft Start

• Output Discharge

• 500kHZ Switching Frequency

• OCP, OVP, UVP Protection and Thermal Shutdown

• Latch off Reset via EN or Power Cycle

APPLICATIONS

• Laptop Computer

• Tablet PC

• Networking Systems

• Personal Video Recorders

• Flat Panel Television and Monitors

• Distributed Power Systems