NB675LGL-Z

NB675L The Future of Analog IC Technology 24V, High Current Synchronous Buck Converter With +/-1.0A LDO and Buffed Reference DESCRIPTION FEATURES 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.             Wide 4.7V to 24V Operating Input Range 10A Continuous Output Current 12A Peak Output Current Built-in +/- 1.0A VTTLDO 105μA Quiescent Current Low RDS(ON) Internal Power MOSFETs Proprietary Switching Loss Reduction Technique Internal Soft Start Output Discharge 500kHZ Switching Frequency for NB675L OCP, OVP, UVP Protection and Thermal Shutdown VDDQ Adjustable from 0.6V to 5.5V APPLICATIONS        Laptop Computer Tablet PC Networking Systems Server Personal Video Recorders Flat Panel Television and Monitors Distributed Power Systems All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 100 90 80 70 60 50 40 30 20 NB675L Rev. 1.1 1/19/2020 1 10 100 1000 IO(mA) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 10000 1 NB675L –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER ORDERING INFORMATION Part Number* Package Top Marking NB675LGL QFN21 (3mmx4mm) NB675L * For Tape & Reel, add suffix –Z (e.g. NB675LGL–Z) PACKAGE REFERENCE TOP VIEW BST 1 SW 2 SW LP# EN2 VCC EN1 FB PG 18 17 16 15 14 13 19 VIN 20 PGND 21 PGND 12 VIN 11 PGND 10 PGND 3 4 5 6 7 8 9 VTTSEN VDDQSEN VTT VINLDO AGND VTTREF EXPOSED PAD ON BACKSIDE ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN ........................................ 24V VSW ............................................... -0.3V to 24.3V VSW (30ns) .......................................... -3V to 28V VSW (5ns) ............................................ -6V to 28V VBST.....................................................VSW + 5.5V VEN ................................................................. 12V Enable Current IEN (2)................................ 2.5mA All Other Pins .............................. –0.3V to +5.5V Continuous Power Dissipation (TA=+25)(3) QFN21 ....................................................... 2.5W Junction Temperature ............................... 150C Lead Temperature .................................... 260C Storage Temperature ................-65C to +150C NB675L Rev. 1.1 1/19/2020 Recommended Operating Conditions (4) Supply Voltage VIN............................ 4.7V to 22V Output Voltage VOUT ........................ 0.6V to 5.5V Enable Current IEN ........................................1mA Operating Junction Temp. (TJ). -40°C to +125°C Thermal Resistance (5) θJA θJC QFN18 (3mmx4mm)................ 50 ...... 12... C/W Notes: 1) Exceeding these ratings may damage the device. 2) Refer to Page 13 of Configuring the EN Control. 3) The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 4) The device is not guaranteed to function outside of its operating conditions. 5) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 2 NB675L –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER ELECTRICAL CHARACTERISTICS VIN = 12V, TJ = 25C, unless otherwise noted. Parameters Symbol Supply Current Supply Current (Shutdown) IIN Supply Current (Quiescent) IIN Supply Current (Quiescent) IIN Supply Current (Quiescent) IIN Condition Min VEN = 0V VEN1 = 0V, VEN2 = 2V, VFB = 0.65V, LP#=0V VEN1 = 0V, VEN2 = 2V, VFB = 0.65V, LP#=2V VEN1 = 2V, VEN2 = 2V, VFB = 0.65V, LP#=2V Typ Max Units 0 1 μA 105 μA 210 μA 395 μA MOSFET High-side Switch On Resistance HSRDS-ON TJ =25C 25 mΩ Low-side Switch On Resistance LSRDS-ON TJ =25C 9 mΩ VEN = 0V, VSW = 0V 0 1 μA 10 12 14 A 400 530 300 600 ns ns 125 130 2 60 4.5 135 %VREF μs %VREF μs 594 600 10 1.6 606 50 1.95 mV nA ms 1.3 160 1.3 160 3 0 3 0 1.4 V mV V mV Switch Leakage SWLKG Current Limit Low-side Valley Current Limit ILIMIT Switching frequency and minimum off time Ton Minimum Off Time(6) Vin=5V,Vout=1.2V TOFF Over-voltage and Under-voltage Protection OVP Threshold OVP Delay UVP Threshold UVP Delay VOVP TOVPDEL VUVP TUVPDEL 55 65 Reference And Soft Start Reference Voltage Feedback Current Soft Start Time VREF IFB TSS VFB = 0.6V Enable And UVLO EN1 Rising threshold EN1 Hysteresis EN2 Rising threshold EN2 Hysteresis VEN1 1.2 VEN1-HYS VILEN2 VEN2-HYS 1.2 Enable1 Input Current IEN1 Enable2 Input Current IEN2 NB675L Rev. 1.1 1/19/2020 VEN1 = 2V VEN1 = 0V VEN2 = 2V VEN2 = 0V www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 1.4 μA μA 3 NB675L –24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, TJ = 25C, unless otherwise noted. Parameters Symbol VCC Under Voltage Lockout Threshold Rising VCC Under Voltage Lockout Threshold Hysteresis Condition VCCVth Min Typ Max Units 4.25 4.45 4.65 V VCCHYS 450 mV VCC Regulator VCC Regulator VCC VCC Load Regulation 4.9 Icc=8mA 5.1 5.3 1 V % Power Good FB Rising (Good) PGVth-Hi FB Falling (Fault) PGVth-Lo 85 FB Rising (Fault) PGVth-Hi 115 FB Falling (Good) PGVth-Lo 105 PGTd 0.4 Power Good Lower to High Delay Power Good Sink Current Capability Power Good Leakage Current 95 %VREF ms VPG Sink 4mA 0.4 V IPG_LEAK VPG = 3.3V 1 uA VTTREF Output VTTREF Output Voltage VTTREF IVTTREF