POWER LOSS (W) LTC3307B 5V, 3A, 10MHz Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN Features FEATURES DESCRIPTION Applications n Pin Compatible with LTC3308(4A) and LTC3309(6A) The LTC 3307B is a very small, high efficiency, low noise, Typical Application n High Efficiency: 8m NMOS, 31m PMOS monolithic synchronous 3A step-down DC/DC converter Description n Programmable Frequency 3MHz to 10MHz operating from a 2.25V to 5.5V input supply. Using con- n Absolute Maximum Ratings Tiny Inductor and Capacitors stant-frequency, peak current mode control at switching n Peak Current Mode Control frequencies 3MHz to 10MHz and minimum on-time as low Order Information n 22ns Minimum On-Time as 22ns, this regulator achieves fast transient response Pin Configuration n Wide Bandwidth, Fast Transient Response with small external components. Silent Switcher architec- n Silent Switcher Architecture ture minimizes EMI emissions. Electrical Characteristics n Ultralow EMI Emissions The LTC3307B operates in forced continuous or pulse- Typical Performance Characteristics 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 Pin Functions 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 Block Diagram n V Range: 0.5V to V OUT IN as low as 500mV. Other features include output over- n Operation V Accuracy: 1% Over Temperature Range OUT voltage protection, short-circuit protection, thermal shut- n Precision 400mV Enable Threshold, 1A in Shutdown Applications Information 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 Typical Applications n Thermally Enhanced 2mm 2mm LQFN Package profile 12-lead 2mm 2mm 0.74mm LQFN package n AEC-Q100 Qualified for Automotive Applications Package Description with exposed pad for low thermal resistance. All registered trademarks and trademarks are the property of their respective owners. Typical Application APPLICATIONS Related Parts 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 Small Solution Size, 6.6MHz, 1.8V 3A Step-Down Converter in Burst Mode Operation 100 10 V = 2.25V TO 5.5V IN 90 EFFICIENCY 1F 1F 80 1 4.7F 4.7F 0201 0201 220nH 70 V OUT SW 1.8V EN V V IN IN 60 0.1 3A SW 50 POWER LOSS 10pF 47.5k 40 0.01 4.7F LTC3307B FB 30 x2 V IN V = 3.3V 18.2k IN 20 0.001 V = 1.8V OUT MODE/SYNC 10nF f = 6.6MHz 10 SW AGND RT MURATA DFE18SAN-R24M-G0 0 0.0001 PGND PGOOD 3307B TA01a 0.001 0.01 0.1 1 3 I (A) LOAD 3307B TA01b f = 6.6MHz OSC Rev. 0 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3307B 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): LTC3307BE ....................................... 40C to +125C LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) LTC3307BI .........................................40C to +125C T = 150C, = 51C/W, = 12C/W, JMAX JA JB LTC3307BJ ........................................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, LTC3307BH ........................................40C to +150C EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB LTC3307BMP .....................................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 LTC3307BEV TRPBF LTC3307BEV TRMPBF LHFS 40C to 125C LTC3307BIV TRPBF LTC3307BIV TRMPBF LHFS 40C to 125C LQFN LTC3307BJV TRPBF LTC3307BJV TRMPBF LHFS 40C to 150C (Laminate Package with QFN Footprint) LTC3307BHV TRPBF LTC3307BHV TRMPBF LHFS 40C to 150C LTC3307BMPV TRPBF LTC3307BMPV TRMPBF LHFS 55C to 150C AUTOMOTIVE PRODUCTS** LTC3307BEV WTRPBF LTC3307BEV WTRMPBF LHFS 40C to 125C LTC3307BIV WTRPBF LTC3307BIV WTRMPBF LHFS 40C to 125C LQFN (Laminate Package with QFN Footprint) LTC3307BJV WTRPBF LTC3307BJV WTRMPBF LHFS 40C to 150C LTC3307BHV WTRPBF LTC3307BHV WTRMPBF LHFS 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