NB670AGQ-P

NB670 24V, High Current Synchronous Buck Converter With LDO The Future of Analog IC Technology DESCRIPTION FEATURES The NB670 is a fully integrated high frequency Wide 5V to 24V Operating Input Range synchronous rectified step-down switch mode 3.3V Fixed Output Voltage converter with 3.3V fixed output voltage. It Built-in 3.3V, 100mA LDO with Switches offers very compact solution to achieve 6A 6A Continuous Output Current continuous output current and 9A peak output 9A Peak Output Current current over a wide input supply range with 300kHZ CLK for External Charge Pump excellent load and line regulation. The NB670 Low R (ON) Internal Power MOSFETs DS operates at high efficiency over a wide output Proprietary Switching Loss Reduction current load range. Constant-On-Time (COT) Technique control mode provides fast transient response Internal Soft Start and eases loop stabilization. Output Discharge Under voltage lockout is internally set as 4.65 V. 500kHZ Switching Frequency An open drain power good signal indicates the OCP, OVP, UVP Protection and Thermal output is within its nominal voltage range. Shutdown NB670 also provides a 3.3V LDO, which can be Latch off Reset via EN or Power Cycle used to power the external peripheries, such as APPLICATIONS the keyboard controller in the laptop computer. A 300kHz CLK is also available its output can Laptop Computer be used to drive an external charge pump, Tablet PC generating gate drive voltage for the load Networking Systems switches without reducing the main converters Personal Video Recorders efficiency. Flat Panel Television and Monitors Distributed Power Systems Full protection features include OCP, OVP, UVP and thermal shut down. 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. The converter requires minimum number of MPS and The Future of Analog IC Technology are registered trademarks of external components and is available in QFN16 Monolithic Power Systems, Inc. (3mmx3mm) package. TYPICAL APPLICATION 100 95 90 V =6V IN 85 V =8.4V IN 80 75 V =12.6V 70 IN 65 60 V =19V IN 55 50 1 10 100 1000 10000 OUTPUT CURRENT (A) NB670 Rev. 1.02 www.MonolithicPower.com 1 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. EFFICIENCY (%)NB670 24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER WITH LDO ORDERING INFORMATION Part Number* Package Top Marking NB670GQ QFN-16 (3mmx3mm) ADZ * For Tape & Reel, add suffix Z (e.g. NB670GQZ) PACKAGE REFERENCE TOP VIEW AGND EN ENLDO VCC BST 12 11 10 14 13 VIN 1 9 15 SW SW PGND 2 16 SW 8 SW 3 4 5 6 7 NC PG CLK LDO VOUT EXPOSED PAD ON BACKSIDE (4) (1) Recommended Operating Conditions ABSOLUTE MAXIMUM RATINGS Supply Voltage V ............................. 5V to 22V IN Supply Voltage V ....................................... 24V IN Output Voltage V ................................... 3.3V OUT V ............................................. -0.3V to 24.3V SW Enable Current I ...................................... 1mA EN V (30ns) ........................................ -3V to 28V SW Operating Junction Temp. (T )..-40C to +125C J V (5ns) .......................................... -6V to 28V SW (5) V .................................................. V + 5.5V BST SW Thermal Resistance JA JC V .............................................................. 12V EN QFN-16 (3mmx3mm) ............. 70 ...... 15 ... C/W V .......................................................... 12V ENLDO (2) Enable Current I ................................ 2.5mA Notes: EN 1) Exceeding these ratings may damage the device. All Other Pins .............................. -0.3V to +5.5V 2) Refer to Page 19 of Configuring the EN Control. (3) 3) The maximum allowable power dissipation is a function of the Continuous Power Dissipation (T =+25C) A maximum junction temperature TJ(MAX), the junction-to- QFN-16.......1.8W ambient thermal resistance , and the ambient temperature JA Junction Temperature .............................. 150C T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX)=(T (MAX)- D J Lead Temperature ................................... 260C T )/ . Exceeding the maximum allowable power dissipation A JA Storage Temperature ............... -65C to +150 C 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. NB670 Rev. 1.02 www.MonolithicPower.com 2 8/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.