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Monolithic Power Systems NB685A | Demoboard EVNB685A-Q-00A
26 V, 12 A, Low Iq, High Current Synchronous Buck Converter with +/- 1 A LDO and Buffered Reference
Overview
| Topology | Buck Converter |
| Input voltage | 4.5-26 V |
| Output 1 | 1.35 V / 12 A |
| IC revision | 1.0 |
Description
The NB685A provides a complete power supply for DDR3, DDR3L, LPDDR3, and DDR4 memory with the highest power density. It integrates a high frequency synchronous rectified step-down switch mode converter (VDDQ) with a 1A sink/source LDO (VTT) and buffered low noise reference (VTTREF). Adaptive Constant-On-Time (COT) control mode provides fast transient response and eases loop stabilization. The DC auto tune loop provides good load and line regulation.
Features
- 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 SwitchingFrequency
- Built-in +/- 1 A VTTLDO
- 1% Buffered VTTREF Output
- Adaptive COT for Fast Transient
- DC Auto-Tune Loop
- Stable with POSCAP and Ceramic OutputCapacitors
- 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
Typical applications
- Networking Systems
- Distributed Power Systems
- Laptop Computers
- Servers