NB671LA 24V, High Current Synchronous Step-down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The NB671LA is the low quiescent current Wide 5.5V to 24V Operating Input Range version of NB671. It is a fully integrated high 6A Continuous Output Current frequency synchronous rectified step-down 9A Peak Output Current switch mode converter, which offers very 120A Quiescent Current compact solutions to achieve 6A continuous Low R (ON) Internal Power MOSFETs DS output current and 9A peak current over a wide Proprietary Switching Loss Reduction input supply range with excellent load and line Technique regulation. The NB671LA operates at high 1% Reference Voltage efficiency over a wide output current load range. Internal Soft Start Constant-On-Time (COT) control mode Output Discharge provides fast transient response and eases loop 500kHZ Switching Frequency stabilization. OCP, OVP, UVP Protection and Thermal Shutdown Under voltage lockout is internally set as 4.5 V, Latch off Reset via EN or Power Cycle. An open drain power good signal indicates the Output Adjustable from 0.604V to 5.5V output is within its nominal voltage range. Support 5V Output from 5.5V Input Full protection features include OCP, OVP, and thermal shut down. APPLICATIONS Laptop Computer The converter requires minimum number of external components and is available in QFN16 Tablet PC (3mmx3mm) package. Networking Systems Personal Video Recorders The NB671LA is pin-to-pin compatible with Flat Panel Television and Monitors NB671 with a NC pin changed to LP , which is Distributed Power Systems used to receive the power state command from the system. 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 95 V =5.8V IN 85 V =8.4V IN 75 V =12.6V IN 65 V =19V IN 55 0.001 0.01 0.1 1 10 I (A) OUT NB671LA Rev. 1.01 www.MonolithicPower.com 1 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. NB671LA, 24V, HIGH CURRENT SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* Package Top Marking NB671LAGQ QFN16 (3x3mm) AJP * For Tape & Reel, add suffix Z (e.g. NB671LAGQZ) PACKAGE REFERENCE TOP VIEW AGND EN FB VCC BST 14 13 12 11 10 VIN 1 9 15 SW SW PGND 2 16 SW SW 8 3 4 5 6 7 LP PG NC NC VOUT (5) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS QFN16 (3mmx3mm) ............... 70 ...... 15 ... C/W Supply Voltage V ....................................... 24V IN V ............................................. -0.3V to 24.3V SW Notes: 1) Exceeding these ratings may damage the device. V (30ns) ................................... -3V to V +4V SW IN 2) Refer to Page 19 of Configuring the EN Control. V .....................................................V + 6V BST SW 3) The maximum allowable power dissipation is a function of the V ............................................................... 12V EN maximum junction temperature T(MAX), the junction-to- J (2) ambient thermal resistance , and the ambient temperature JA Enable Current I ................................ 2.5mA EN T . The maximum allowable continuous power dissipation at A All Other Pins ............................. 0.3V to +5.5V any ambient temperature is calculated by P (MAX)=(T (MAX)- D J (3) T )/ . Exceeding the maximum allowable power dissipation A JA Continuous Power Dissipation (T =+25) A will cause excessive die temperature, and the regulator will go QFN16......1.8W into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. Junction Temperature .............................. 150C 4) The device is not guaranteed to function outside of its Lead Temperature ................................... 260C operating conditions. 5) Measured on JESD51-7, 4-layer PCB. Storage Temperature ............... -65C to +150 C (4) Recommended Operating Conditions Supply Voltage V .......................... 5.5V to 22V IN Output Voltage V ................... 0.604V to 5.5V OUT Enable Current I ...................................... 1mA EN Operating Junction Temp. (T ). -40C to +125C J NB671LA Rev. 1.01 www.MonolithicPower.com 2 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.