NB669 24V, High Current Synchronous Buck Converter With LDO The Future of Analog IC Technology DESCRIPTION FEATURES The NB669 is a fully integrated high frequency Wide 6.5V to 24V Operating Input Range synchronous rectified step-down switch mode 5V Fixed Output Voltage converter with 5V fixed output voltage. It offers Built-in 5V, 100mA LDO with Switches very compact solution to achieve 6A continuous 6A Continuous Output Current output current and 9A peak output current over 9A Peak Output Current a wide input supply range with excellent load 300kHZ CLK for External Charge Pump and line regulation. The NB669 operates at high Low R (ON) Internal Power MOSFETs DS efficiency over a wide output current load range. Proprietary Switching Loss Reduction Constant-On-Time (COT) control mode Technique provides fast transient response and eases loop Internal Soft Start stabilization. Output Discharge 500kHZ Switching Frequency Under voltage lockout is internally set as 4.15 V. An open drain power good signal indicates the OCP, OVP, UVP Protection and Thermal output is within its nominal voltage range. Shutdown Latch off Reset via EN or Power Cycle. NB669 also provides a 5V LDO, which can be used to power the external peripheries, such as APPLICATIONS the keyboard controller in the laptop computer. Laptop Computer A 300kHz CLK is also available its output can Tablet PC be used to drive an external charge pump, Networking Systems generating gate drive voltage for the load Personal Video Recorders switches without reducing the main converters Flat Panel Television and Monitors efficiency. Distributed Power Systems Full protection features include OCP, OVP, All MPS parts are lead-free and adhere to the RoHS directive. For MPS green UVP and thermal shut down. status, please visit MPS website under Products, Quality Assurance page. MPS and The Future of Analog IC Technology are registered trademarks of The converter requires minimum number of Monolithic Power Systems, Inc. external components and is available in QFN16 (3mmx3mm) package. TYPICAL APPLICATION NB669 Rev. 1.03 www.MonolithicPower.com 1 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. NB669, 24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER WITH LDO ORDERING INFORMATION Part Number* Package Top Marking NB669GQ QFN16 (3mmx3mm) AEV * For Tape & Reel, add suffix Z (e.g. NB669GQZ) PACKAGE REFERENCE TOP VIEW AGND EN ENLDO VCC BST 12 11 10 14 13 VIN 1 SW 9 SW 15 PGND 2 16 SW 8 SW 3 4 5 6 7 PG CLK LDO VOUT NC EXPOSED PAD ON BACKSIDE (4) (1) Recommended Operating Conditions ABSOLUTE MAXIMUM RATINGS Supply Voltage V .......................... 6.5V to 22V IN Supply Voltage V ....................................... 24V IN Output Voltage V ...................................... 5V OUT V ....................................... -0.3V to V + 0.3V SW IN Enable Current I ...................................... 1mA EN V (30ns) ..................................-3V to V + 4V SW IN Operating Junction Temp. (T )..-40C to +125C J V (5ns) ..................................... -6V to V +4V SW IN (5) V .................................................. V + 5.5V BST SW Thermal Resistance JA JC V .............................................................. 12V EN QFN16 (3mmx3mm) ............... 70 ...... 15 ... C/W (2) Enable Current I ................................ 2.5mA EN Notes: All Other Pins .............................. -0.3V to +5.5V (3) 1) Exceeding these ratings may damage the device. Continuous Power Dissipation (T =+25C) A 2) Refer to Page 11 of Configuring the EN Control. 3) The maximum allowable power dissipation is a function of the QFN16.....1.8W maximum junction temperature T(MAX), the junction-to- J Junction Temperature .............................. 150C ambient thermal resistance JA, and the ambient temperature T . The maximum allowable continuous power dissipation at Lead Temperature ................................... 260C A any ambient temperature is calculated by P (MAX)=(T (MAX)- D J Storage Temperature ............... -65C to +150 C T )/ . Exceeding the maximum allowable power dissipation A JA 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. NB669 Rev. 1.03 www.MonolithicPower.com 2 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.