NB649EQJ-LF-Z

NB649 8A, 25V, 600kHz Synchronous Step-Down Converter with Integrated LDO The Future of Analog IC Technology DESCRIPTION FEATURES The NB649 is a high frequency synchronous rectified step-down switch mode converter with a built in LDO regulator. It offers a very compact solution to achieve 8A continuous output current over a wide input, load and line range. • • • • • • • • • • • • Full protection features include OCP and thermal shut down. The NB649 requires a minimum number of readily available standard external components and is available in a space saving 5mm x 6mm 30-pin QFN package. Wide 5.5V to 25V Operating Input Range 8A Output Current Internal Low RDS(ON) Power MOSFETs Fixed 600kHz switching frequency Sync from 300kHz to 1MHz External Clock Integrated 100mA LDO Internal Compensation Power Good Output Integrated Bootstrap Diode OCP Protection and Thermal Shutdown Output Adjustable from 0.8V to 15V Available in 5mm x 6mm 30-pin QFN package. APPLICATIONS • • • Notebook Systems and I/O Power Networking Systems Distributed Power Systems For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION (FOR NOTEBOOK) 4.5V~23V VIN 27, 28, 29 21 BST IN NB649 VCC R3 22 REGO AAM R4 FB 25 ENLDO ON/OFF 1 26 PG SDRV ENLDO EN SS 23 NB649 Rev. 1.0 12/10/2013 SW LDO AGND GND 20 4 6, 7, 8, 16, 17, 18 3 CC 15pF VOUT 1.8V 24 19 2 SELH 9, 10, 11, 30 12, 13, 14, 15 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 NB649 – 8A, 25V, 600kHz SYNCHRONOUS STEP-DOWN CONVERTER WITH INTEGRATED LDO ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (TA) NB649EQJ 5x6mm QFN30 N649EQJ -20°C to +85°C * For Tape & Reel, add suffix –Z (e.g. NB649EQJ–Z); For RoHS compliant packaging, add suffix –LF (e.g. NB649EQJ–LF–Z) PACKAGE REFERENCE /SELH IN IN IN EN/SYNC PG FB TOP VIEW 30 29 28 27 26 25 24 ENLDO 1 23 SS LDO 2 22 AAM REGO 3 BST 4 20 AGND NC 5 19 SDRV 21 VCC AGND 18 SW SW 6 SW SW 7 17 SW 16 SW 12 GND GND GND ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN .......................................28V VSW .......................................-0.3V to VIN + 0.3V VBS ..................................................... VSW + 6V IVIN(RMS) ...........................................................3A ISW(RMS) ...........................................................3A All Other Pins................................ –0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) 5x6 QFN30 ................................................2.9W Junction Temperature.............................. 150°C Lead Temperature ................................... 260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions (3) 13 14 15 GND 11 GND 10 GND 9 GND SW 8 Thermal Resistance (4) θJA θJC 5x6 QFN30 .............................42 ....... 9 ....°C/W Notes: 1) Exceeding these ratings may damage the device. 2) 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. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. Supply Voltage VIN .......................... 4.5V to 25V Output Voltage VOUT........................ 0.8V to 15V Maximum Junction Temp. (TJ) ............. +125°C NB649 Rev. 1.0 12/10/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 NB649 – 8A, 25V, 600kHz SYNCHRONOUS STEP-DOWN CONVERTER WITH INTEGRATED LDO ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Parameters Symbol Supply Current (Shutdown) Supply Current (Quiescent) High Side Switch On Resistance Low Side Switch On Resistance Switch Leakage Current Limit Oscillator Frequency IIN IIN HSW RDS-ON LSW RDS-ON SW LKG ILIMIT FSW Fold-back Frequency Maximum Duty Cycle Sync Frequency Range Feedback Voltage Feedback Current Soft Start Charging Current EN/SYNC Input Low Voltage FFB DMAX FSYNC VFB IFB ISS VILEN EN/SYNC Input High Voltage VIHEN Condition VENLDO = 0V Min VEN = 2V, VFB = 1V VEN = 0V, VSW = 0V Typ Max Units 25 30 μA 0.85 50 8 0 1 mA mΩ mΩ μA A kHz 9.5 VFB = 0.75V 600 VFB = 100mV VFB = 700mV 0.25 90 85 0.3 788 VFB = 800mV VSS=0V 808 10 10 2 ENTd-Off PGVth-Hi PGVth-Lo Power Good Delay Power Good Sink Current Capability Power Good Leakage Current VIN Under Voltage Lockout Threshold Rising VIN Under Voltage Lockout Threshold Hysteresis VCC Under Voltage Lockout Threshold Rising VCC Under Voltage Lockout Threshold Hysteresis VCC Regulator VCC Load Regulation PGTd 0.42 LDO Switch On Resistance NB649 Rev. 1.0 12/10/2013 VEN = 2V VEN = 0V fSW % MHz mV nA μA V V EN Turn Off Delay Power Good Threshold Rising Power Good Threshold Falling IEN 1 828 50 0.4 2 0 5 0.9 0.7 EN Input Current 10 μA μsec VFB VFB Tss (6) VPG Sink 4mA 0.4 V IPG_LEAK VPG = 3.3V 10 nA INUVVth 5 V INUVHYS 430 mV VCCUVVth 3.8 VCCUVHYS VCC RLDO 4.5 ICC=20mA VLDO=5V, ILDO=100mA 4.0 4.2 V 880 mV 5 5 V % 5 Ω www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 NB649 – 8A, 25V, 600kHz SYNCHRONOUS STEP-DOWN CONVERTER WITH INTEGRATED LDO ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, TA = +25°C, unless otherwise noted. Parameters Symbol LDO Output Voltage LDO Output Current Switch Over Threshold (Rising) Switch Over Hysteresis ENLDO Input Threshold R-ENLDO Pull Down R-ENLDO Pull Up Thermal Shutdown VLDO ILDO VSWO VSWO-HYS RENLDOdown RENLDOup TSD Condition Min Typ Max Units SELH=0V, ILDO