NB675L

NOT RECOMMENDED FOR NEW DESIGNS

High-Efficiency, Fast-Transient, 10A, 24V, Fully-Integrated COT Sync Buck with +/-1A LDO and Buffered Reference, Low Iq Version

ALTERNATIVE PART

NRFND Datasheet

NB675L 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!

Parameters Description

Vin (min) (V)
4.7
Vin (max) (V)
24
Iout (max) (A)
10
Iq (typ) (mA)
0.105
Vfb (V)
0.604
fsw (max) (kHz)
500
Control Mode
COT Control
Package (mm)
QFN-21 (3x4)
Grade
Catalog
Regulated Outputs
1
Vout (min) (V)
0.6
Vout (max) (V)
5.5
Isw Limit (typ) (A)
12

The NB675L is the lower quiescent current version of NB675. It 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 1.0A sink/source LDO (VTT) and buffered low noise reference (VTTREF).
NB675L is able to deliver 10A continuous output current and 12A 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 1.0A 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 4.6V. An open drain power good signal indicates VDDQ is within its nominal voltage range.
Full protection features include OCP, OVP, and thermal shut down.
This part requires minimum number of external components and is available in QFN21 (3mmx4mm) package.