NB672

NB672

NOT RECOMMENDED FOR NEW DESIGNS

High-Efficiency, Fast-Transient, 6A, 24V, Fully-Integrated COT Synchronous Buck with +/-1.5A LDO and Buffed Reference

ALTERNATIVE PART

NRFND Datasheet

NB672 continues to be in production for existing customers. Please consider this alternative for new designs:

NB685A

Wide Vin 4.5-26V, 12A, Low Iq, High Current Synchronous Buck Converter with +/-1A LDO and Buffered Reference

Features & Benefits

Wide 4.5 V to 26 V Operating Input Range
Compatible for IMVP8
135 μA Low Quiescent Current
12 A Continous Output Current
13 A Peak Output Current
Selectable Ultrasonic Mode
Selectable 500 k/700 k Switching Frequency
Built-in +/- 1 A VTTLDO
1% Buffered VTTREF Output
Adaptive COT for Fast Transient
DC Auto-Tune Loop
Stable with POSCAP and Ceramic Output Capacitors
Over-Temperature Warning
Internal Soft Start
Output Discharge
OCL, OVP, UVP, and Thermal Shutdown
Latch-Off Reset via EN or Power Cycle
QFN 3mm x 3mm Package

… and many more!

Description

The NB672/NB673 provides a complete power supply for DDR3, DDR3L and LPDDR2 memory with the highest power density. It integrates a high frequency synchronous rectified step-down switch mode converter (VDDQ) with a 1.5A sink/source LDO (VTT) and buffered low noise reference (VTTREF). The fully integrated Buck converter of NB672/NB673 is able to deliver 6A/8A continuous output current and 8A/10A peak output current over a wide input supply range with excellent load and line regulation. The Buck converter employs the Constant-On-Time (COT) control scheme, which provides fast transient response and eases loop stabilization. The VTT LDO provides 1.5A sink/source current capability and requires only 10uF ceramic capacitance. The VTTREF tracks VDDQ/2 with an excellent 1% accuracy. Under voltage lockout is internally set as 4.5V. An open drain power good signal indicates VDDQ is within its nominal voltage range. Full protection features include OCP, OVP, and thermal shut down. These two parts require minimum number of external components and are available in QFN21 (3mmx4mm) package.