POWER LOSS (W) LTC3308A 5V, 4A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN FEATURES DESCRIPTION n Pin Compatible with LTC3307(3A) and LTC3309(6A) The LTC 3308A is a very small, high efficiency, low n High Efficiency: 8m NMOS, 31m PMOS noise, monolithic synchronous 4A step-down DC/DC n Programmable Frequency 1MHz to 3MHz converter operating from a 2.25V to 5.5V input supply. n Tiny Inductor and Capacitors Using constant frequency, peak current mode control n Peak Current Mode Control at switching frequencies 1MHz to 3MHz and minimum n 22ns Minimum On-Time on-time as low as 22ns, this regulator achieves fast n Wide Bandwidth, Fast Transient Response transient response with small external components. Silent n Silent Switcher Architecture Switcher architecture minimizes EMI emissions. n Ultralow EMI Emissions The LTC3308A 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 n Safely Tolerates Inductor Saturation in Overload operation for high efficiency at light loads, ideal for n V Range: 2.25V to 5.5V IN battery-powered systems. The IC regulates output n V Range: 0.5V to V OUT IN voltages as low as 500mV. Other features include output n V Accuracy: 1% Over Temperature Range OUT overvoltage protection, short-circuit protection, thermal n Precision 400mV Enable Threshold, 1A in Shutdown shutdown, clock synchronization, and up to 100% duty n Power Good, Internal Compensation and Soft Start cycle operation for low dropout. The device is available n Thermally Enhanced 2mm 2mm LQFN Package in a low profile 12-lead 2mm 2mm 0.74mm LQFN n AEC-Q100 Qualified for Automotive Applications package with 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 Efciency and Power Loss Efficiency and Power Loss in Burst Mode Operation in Burst Mode Operation High Efficiency, 2MHz, 1.2V 4A Step-Down Converter 100 10 V = 2.25V TO 5.5V IN 90 EFFICIENCY 80 1 1F 1F 4.7F 4.7F 0201 0201 330nH 70 V OUT SW 1.2V EN V V IN IN 60 0.1 4A SW 50 10pF 140k 22F 40 0.01 LTC3308A FB x2 POWER LOSS V IN 30 100k V = 3.3V 10nF IN MODE/SYNC 20 0.001 V = 1.2V OUT AGND RT f = 2 MHz SW 10 3308A TA01a PGND PGOOD Murata DFE201612ER33M 0.0001 0 0.001 0.01 0.1 1 4 f = 2MHz OSC I (A) LOAD 3308A TA01b Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3308A 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): LTC3308AE ....................................... 40C to +125C LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) LTC3308AI .........................................40C to +125C T = 150C, = 51C/W, = 12C/W, JMAX JA JB LTC3308AJ ........................................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, LTC3308AH .......................................40C to +150C EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB LTC3308AMP .....................................55C 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 LTC3308AEV TRPBF LTC3308AEV TRMPBF LHFT 40C to 125C LTC3308AIV TRPBF LTC3308AIV TRMPBF LHFT 40C to 125C LQFN LTC3308AJV TRPBF LTC3308AJV TRMPBF LHFT 40C to 150C (Laminate Package with QFN Footprint) LTC3308AHV TRPBF LTC3308AHV TRMPBF 40C to 150C LHFT LTC3308AMPV TRPBF LTC3308AMPV TRMPBF LHFT 55C to 150C AUTOMOTIVE PRODUCTS** LTC3308AEV WTRPBF LTC3308AEV WTRMPBF LHFT 40C to 125C LTC3308AIV WTRPBF LTC3308AIV WTRMPBF LHFT 40C to 125C LQFN (Laminate Package with QFN Footprint) LTC3308AJV WTRPBF LTC3308AJV WTRMPBF 40C to 150C LHFT LTC3308AHV WTRPBF LTC3308AHV WTRMPBF LHFT 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. A 2 For more information www.analog.com SW FB SW PGOOD