POWER LOSS (W) LTC3307A 5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN FEATURES DESCRIPTION n Pin Compatible with LTC3308(4A) and LTC3309(6A) The LTC 3307A is a very small, high efficiency, low noise, n High Efficiency: 8m NMOS, 31m PMOS monolithic synchronous 3A 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 LTC3307A operates in forced continuous or pulse n Low Ripple Burst Mode Operation with I of 40A Q skip mode for low noise, or low-ripple Burst Mode opera- n Safely Tolerates Inductor Saturation in Overload tion for high efficiency at light loads, ideal for battery- n V Range: 2.25V to 5.5V IN powered systems. The IC regulates output voltages as n V Range: 0.5V to V OUT IN low as 500mV. Other features include output overvoltage n V Accuracy: 1% Over Temperature Range OUT protection, short-circuit protection, thermal shutdown, n Precision 400mV Enable Threshold, 1A in Shutdown clock synchronization, and up to 100% duty cycle opera- n Power Good, Internal Compensation and Soft Start tion for low dropout. The device is available in a low pro- n Thermally Enhanced 2mm 2mm LQFN Package file 12-lead 2mm 2mm 0.74mm LQFN package with n AEC-Q100 Qualified for Automotive Applications exposed pad for low thermal resistance. All registered trademarks and trademarks are the property of their respective owners. APPLICATIONS n Optical Networking, Servers, Telecom 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 Efciency and Power Loss High Efficiency, 2MHz, 1.2V 3A Step-Down Converter in Burst Mode Operation in Burst Mode Operation V = 2.25V TO 5.5V IN 100 10 90 1F 1F EFFICIENCY 4.7F 4.7F 80 1 0201 0201 470nH V 70 OUT SW 1.2V EN V V IN IN 60 0.1 3A SW 50 10pF 140k 40 0.01 15F LTC3307A FB POWER LOSS x2 30 V IN 100k V = 3.3V IN 20 0.001 V = 1.2V 10nF OUT MODE/SYNC f = 2 MHz SW 10 AGND RT Murata DFE201210SR47M 3307A TA01a 0 0.0001 PGND PGOOD 0.001 0.01 0.1 1 3 LOAD CURRENT (A) 3307A TA01b f = 2MHz OSC Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3307A 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): LTC3307AE ....................................... 40C to +125C LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) LTC3307AI .........................................40C to +125C T = 150C, = 51C/W, = 12C/W, JMAX JA JB LTC3307AJ ........................................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, LTC3307AH ........................................40C to +150C EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB LTC3307AMP .....................................55C to +150C Storage Temperature Range .................65C to +150C Maximum Reflow (Package Body) Temperature ...260C ORDER INFORMATION PACKAGE TAPE AND REEL TAPE AND REEL MINI PART MARKING* TYPE TEMPERATURE RANGE LTC3307AEV TRPBF LTC3307AEV TRMPBF LHFR 40C to 125C LTC3307AIV TRPBF LTC3307AIV TRMPBF LHFR 40C to 125C LQFN LTC3307AJV TRPBF LTC3307AJV TRMPBF LHFR 40C to 150C (Laminate Package with QFN Footprint) LTC3307AHV TRPBF LTC3307AHV TRMPBF LHFR 40C to 150C LTC3307AMPV TRPBF LTC3307AMPV TRMPBF LHFR 55C to 150C AUTOMOTIVE PRODUCTS** LTC3307AEV WTRPBF LTC3307AEV WTRMPBF LHFR 40C to 125C LTC3307AIV WTRPBF LTC3307AIV WTRMPBF LHFR 40C to 125C LQFN (Laminate Package with QFN Footprint) LTC3307AJV WTRPBF LTC3307AJV WTRMPBF LHFR 40C to 150C LTC3307AHV WTRPBF LTC3307AHV WTRMPBF LHFR 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