POWER LOSS (W) LTC3309A 5V, 6A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN FEATURES DESCRIPTION n Pin Compatible with LTC3307(3A) and LTC3308(4A) The LTC 3309A is a very small, high efficiency, low noise, n High Efficiency: 8m NMOS, 31m PMOS monolithic synchronous 6A step-down DC/DC converter n Programmable Frequency 1MHz to 3MHz operating from a 2.25V to 5.5V input supply. Using con- n Tiny Inductor and Capacitors stant frequency, peak current mode control at switching n Peak Current Mode Control frequencies 1MHz to 3MHz and minimum on-time as low n 22ns Minimum On-Time as 22ns, this regulator achieves fast transient response n Wide Bandwidth, Fast Transient Response with small external components. Silent Switcher architec- n Silent Switcher Architecture ture minimizes EMI emissions. n Ultralow EMI Emissions The LTC3309A operates in forced continuous or pulse n Low Ripple Burst Mode Operation with I of 40A Q skip mode for low noise, or the low-ripple Burst Mode n Safely Tolerates Inductor Saturation in Overload operation for high efficiency at light loads, ideal for bat- n V Range: 2.25V to 5.5V IN tery-powered systems. The IC regulates output voltages n V Range: 0.5V to V OUT IN as low as 500mV. Other features include output over- n V Accuracy: 1% Over Temperature Range OUT voltage protection, short-circuit protection, thermal shut- n Precision 400mV Enable Threshold, 1A in Shutdown down, clock synchronization, and up to 100% duty cycle n Power Good, Internal Compensation and Soft Start operation for low dropout. The device is available in a low n Thermally Enhanced 2mm 2mm LQFN Package profile 12-lead 2mm 2mm 0.74mm LQFN package n AEC-Q100 Qualified for Automotive Applications with exposed pad for low thermal resistance. For applications that require a faster power on, the APPLICATIONS LTC3309A-7 has a reduced power on and soft-starttime. n Optical Networking, Servers, Telecom All registered trademarks and trademarks are the property of their respective owners. n Automotive, Industrial, Communications n Distributed DC Power Systems (POL) n FPGA, ASIC, P Core Supplies n Battery Operated Systems TYPICAL APPLICATION Efficiency and Power Loss High Efficiency, 2MHz, 1.2V 6A Step-Down Converter in Burst Mode Operation 100 10 V = 2.5V TO 5.5V IN 90 EFFICIENCY 80 1 1F 1F 10F 10F 0201 0201 70 220nH V OUT SW 1.2V EN V V IN IN 0.1 60 6A SW 50 10pF 140k 40 0.01 33F LTC3309A FB POWER LOSS x2 V 30 IN 100k V = 3.3V IN 10nF MODE/SYNC 20 0.001 V = 1.2V OUT AGND RT f = 2 MHz SW 10 3309A TA01a PGND PGOOD COILCRAFT XEL3515221 0 0.0001 0.001 0.01 0.1 1 6 f = 2MHz LOAD CURRENT (A) OSC 3309A TA01b Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3309A ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V .............................................................. 0.3V to 6V IN EN ........................ 0.3V to Lesser of (V + 0.3V) or 6V IN FB ........................ 0.3V to Lesser of (V + 0.3V) or 6V IN 12 11 AGND 1 10 RT MODE/SYNC ........ 0.3V to Lesser of (V + 0.3V) or 6V IN EN 2 9 MODE/SYNC RT ........................ 0.3V to Lesser of (V + 0.3V) or 6V IN 13 PGND AGND to PGND ....................................... 0.3V to +0.3V V 3 8 V IN IN PGOOD ......................................................... 0.3V to 6V PGND 7 PGND 4 5 6 I ......................................................................5mA PGOOD Operating Junction Temperature Range (Note 2): LTC3309AE ....................................... 40C to +125C LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) LTC3309AI .........................................40C to +125C T = 150C, = 51C/W, = 12C/W, JMAX JA JB LTC3309AJ ........................................40C to +150C = 8.6C/W, = 73C/W, = 0.6C/W JCBOTTOM JCTOP JT AND VALUES DETERMINED PER JESD51-7 ON A JEDEC 2S2P PCB, LTC3309AH .......................................40C to +150C EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB LTC3309AMP .....................................55C to +150C LTC3309AJ-7 .....................................40C to +150C Storage Temperature Range .................65C to +150C Maximum Reflow (Package Body) Temperature ...260C ORDER INFORMATION TAPE AND REEL TAPE AND REEL MINI PART MARKING* PACKAGE TYPE TEMPERATURE RANGE LTC3309AEV TRPBF LTC3309AEV TRMPBF 40C to 125C LHFP LTC3309AIV TRPBF LTC3309AIV TRMPBF LHFP 40C to 125C LTC3309AJV TRPBF LTC3309AJV TRMPBF LHFP 40C to 150C LQFN (Laminate Package with QFN Footprint) LTC3309AHV TRPBF LTC3309AHV TRMPBF LHFP 40C to 150C LTC3309AMPV TRPBF LTC3309AMPV TRMPBF 55C to 150C LHFP LTC3309AJV-7 TRPBF LTC3309AJV-7 TRMPBF 40C to 150C LHQH AUTOMOTIVE PRODUCTS** LTC3309AEV WTRPBF LTC3309AEV WTRMPBF LHFP 40C to 125C LTC3309AIV WTRPBF LTC3309AIV WTRMPBF LHFP 40C to 125C LQFN LTC3309AJV WTRPBF LTC3309AJV WTRMPBF 40C to 150C LHFP (Laminate Package with QFN Footprint) LTC3309AHV WTRPBF LTC3309AHV WTRMPBF 40C to 150C LHFP LTC3309AJV-7 WTRPBF LTC3309AJV-7 WTRMPBF LHQH 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. B 2 For more information www.analog.com SW FB SW PGOOD