POWER LOSS (W) LTC3308B 5V, 4A, 10MHz Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN FEATURES DESCRIPTION n Pin Compatible with LTC3307(3A) and LTC3309(6A) The LTC 3308B 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 3MHz to 10MHz converter operating from a 2.25V to 5.5V input supply. n Tiny Inductor and Capacitors Using constant frequency, peak current mode control at n Peak Current Mode Control switching frequencies 3MHz to 10MHz 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. n Silent Switcher Architecture SilentSwitcher architecture minimizes EMI emissions. n Ultralow EMI Emissions The LTC3308B operates in forced continuous or pulse- n Low Ripple Burst Mode Operation with I of 40A Q skipping 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. n Thermally Enhanced 2mm 2mm LQFN Package n The LTC3308B is available in a low profile 12-lead 2mm AEC-Q100 Qualified for Automotive Applications 2mm 0.74mm LQFN package with exposed pad for low thermal resistance. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Optical Networking, Servers, Telecom n Automotive, Industrial, Communications n Distributed DC Power Systems (POL) n FPGA, ASIC, P Core Supplies TYPICAL APPLICATION Efficiency and Power Loss in Burst Mode Operation Small Solution Size, 6.6MHz, 1.8V 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 70 150nH V OUT SW 1.8V EN V V 0.1 IN IN 60 4A SW 50 10pF 47.5k POWER LOSS 40 0.01 4.7F LTC3308B FB x2 V 30 IN 18.2k V = 3.3V 10nF IN 20 0.001 MODE/SYNC V = 1.8V OUT AGND RT f = 6.6 MHz 10 SW PGND PGOOD 3308B TA01a MURATA DFE201612PD-R15M 0 0.0001 0.001 0.01 0.1 1 4 I (A) f = 6.6MHz LOAD OSC 3308B TA01b Rev. 0 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3308B 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): LTC3308BE ....................................... 40C to +125C LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) LTC3308BI .........................................40C to +125C T = 150C, = 51C/W, = 12C/W, JMAX JA JB LTC3308BJ ........................................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, LTC3308BH........................................40C to +150C EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB LTC3308BMP .....................................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 LTC3308BEV TRPBF LTC3308BEV TRMPBF LHFV 40C to 125C LTC3308BIV TRPBF LTC3308BIV TRMPBF LHFV 40C to 125C LQFN LTC3308BJV TRPBF LTC3308BJV TRMPBF LHFV 40C to 150C (Laminate Package with QFN Footprint) LTC3308BHV TRPBF LTC3308BHV TRMPBF 40C to 150C LHFV LTC3308BMPV TRPBF LTC3308BMPV TRMPBF LHFV 55C to 150C AUTOMOTIVE PRODUCTS** LTC3308BEV WTRPBF LTC3308BEV WTRMPBF LHFV 40C to 125C LTC3308BIV WTRPBF LTC3308BIV WTRMPBF LHFV 40C to 125C LQFN (Laminate Package with QFN Footprint) LTC3308BJV WTRPBF LTC3308BJV WTRMPBF 40C to 150C LHFV LTC3308BHV WTRPBF LTC3308BHV WTRMPBF LHFV 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. 0 2 For more information www.analog.com SW FB SW PGOOD