NB681 Datasheet (data sheet) PDF





NB681 Datasheet, High Current Synchronous Buck Converter

NB681   NB681  

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NB681 28V, 6A, Low Iq, High Current Sync hronous Buck Converter with 2-Bit VID DESCRIPTION The NB681 is a fully integr ated, high-frequency, synchronous, rect ified, step-down, switch-mode converter with 2-bit VID, especially designed fo r IMVP8 applications—VCCIO, PRIMCORE, V1.0A, EDRAM, and EOPIO. It offers a v ery compact solution to achieve a 6A co ntinuous output current and a 7.5A peak output current over a wide input suppl y range. The NB681 operates at high eff iciency over a wide output current load range based on MPS proprietary switchi ng loss reduction technology and intern al low Ron power MOSFETs. Adaptive cons tant-on-time (COT) control

NB681 Datasheet, High Current Synchronous Buck Converter

NB681   NB681  
mode provides fast transient response an d eases loop stabilization. The DC auto -tune loop provides good load and line regulation. To avoid audible noise, NB6 81 provides lowpower mode for power los s saving during the low-power state and ultrasonic mode. Full protection featu res include OC limit, OVP, UVP, and the rmal shutdown. The converter requires a minimal number of external components, and it is available in a QFN 2mm x 3 m m package. FEATURES  Wide 4.5V to 2 8V Operating Input Range  VCCIO/PRIM CORE/EDRAM/EOPIO/V1.0A Compatible for I MVP8  Output Adjustable by 2-Bit VID  Low-Power Mode  25µA Low Quies cent Current  6A Continous Output Cu rrent  7.5A Peak Output Current  Selectable Ultrasonic Mode  Adaptive COT for Fast Transient  DC Auto-Tun e Loop  Stable with POSCAP and Ceram ic Capacitors  1% Reference Voltage  Internal Soft Start  Output Disc harge  OCL, OVP, UVP, and Thermal Sh utdown,  Latch-Off Reset via EN or P ower Cycle  QFN 2mm x 3mm Package AP PLICATIONS  Laptop Computers  Tab let PCs  Networking Systems  Serv ers  Personal Video Recorders  Fl at Panel Televisions and Monitors  D istributed Power Systems All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance.








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