POWER LOSS (W) LTC3315B Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm 2mm LQFN FEATURES DESCRIPTION n Dual Outputs Each with 2A Output Current The LTC 3315B features dual 2A monolithic synchro- n High Efficiency: 19m NMOS and 75m PMOS nous step-down converters operating from a 2.25V to n Wide Bandwidth, Fast Transient Response 5.5V input supply in one package for space-constrained n Switching Frequency Synchronizable Up to 10MHz applications with demanding performance requirements. n V Range: 2.25V to 5.5V Using constant frequency, peak current mode control at IN n V Range: 0.5V to V switching frequencies up to 10MHz with a minimum on- OUT IN n V Accuracy: 1% time as low as 25ns, both bucks achieve high efficiency OUT n Low Ripple Burst Mode Operation and fast transient response in a very small application n Peak Current Mode Control footprint. n Minimum On-Time: 25ns The LTC3315B operates in forced continuous or pulse n Safely Tolerates Inductor Saturation in Overload skip mode for low noise or in Burst Mode operation for n Shutdown Current: 1.2A high efficiency at light loads. The common buck switching n Precision 400mV Enable Thresholds frequency is 6MHz and can be synchronized to an external n Internal Soft-Start and Compensation oscillator via the MODE/SYNC pin. n Power Good Output n The LTC3315B can regulate outputs as low as 500mV. Low Profile, Thermally Enhanced 12-Lead Other features include precision enable thresholds, a 2mm 2mm 0.74mm LQFN Package n PGOOD signal, output overvoltage protection, thermal AEC-Q100 Qualified for Automotive Applications shutdown, output short-circuit protection, and up to 100% duty cycle operation for low dropout. The LTC3315B is APPLICATIONS available in a compact 2mm 2mm LQFN package. n Servers, Telecom Supplies, Optical Networking All registered trademarks and trademarks are the property of their respective owners. n Distributed DC Power Systems (POL) n FPGA, ASIC, P Core Supplies n Industrial/Automotive/Communications TYPICAL APPLICATION Efficiency vs Load Current Efciency vs Load Current Dual 6MHz 2A Buck Regulators 100 1.0 330nH 90 0.9 V V IN OUT1 V SW1 IN 1.8V, 2A 3.3V 1F 80 0.8 3.3pF 10F 86.6k 0201 70 0.7 10F FB1 60 0.6 EN1 33.2k 50 0.5 LTC3315B Burst Mode OPERATION V IN 330nH 40 0.4 V = 3.3V, V = 1.8V 1F IN OUT V OUT2 10F SW2 L = 330nH, L DCR = 21m 0201 2.0V, 2A 30 0.3 f = 6MHz 3.3pF SW 100k 20 0.2 EN2 10F EFFICIENCY 10 0.1 MODE/SYNC FB2 POWER LOSS 33.2k 0 0 PGOOD GND 1m 10m 100m 1 2 3315B TA01a LOAD CURRENT (A) f = 6MHz SW 3315B G01 Rev. 0 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3315B ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V ............................................................... 0.3V to 6V IN EN1, EN2 .............. 0.3V to Lesser of (V + 0.3V) or 6V IN FB1, FB2 ............... 0.3V to Lesser of (V + 0.3V) or 6V IN 12 11 EN1 1 10 V MODE/SYNC ........ 0.3V to Lesser of (V + 0.3V) or 6V IN IN PGOOD ......................................................... 0.3V to 6V FB1 2 9 GND 13 GND I ......................................................................5mA PGOOD FB2 3 8 GND Operating Junction Temperature (Notes 2, 3): EN2 4 7 V IN 5 6 LTC3315BE ........................................ 40C to 125C LTC3315BI ......................................... 40C to 125C LQFN PACKAGE LTC3315BJ ........................................ 40C to 150C 12-LEAD (2mm 2mm 0.74mm) LTC3315BH ........................................ 40C to 150C T = 150C, = 51C/W, = 8.6C/W, JMAX JA JCBOTTOM = 80C/W, = 12C/W, = 0.8C/W, JCTOP JB JT LTC3315BMP ..................................... 55C to 150C AND VALUES DETERMINED PER JESD51-7 ON A JEDEC 2S2P PC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C Maximum Reflow (Package Body) Temperature ...260C ORDER INFORMATION PART MARKING* PACKAGE MSL TEMPERATURE RANGE TAPE AND REEL (MINI) TAPE AND REEL DEVICE FINISH CODE TYPE RATING (SEE NOTE 2) LTC3315BEV TRMPBF LTC3315BEV TRPBF 40C to 125C LTC3315BIV TRMPBF LTC3315BIV TRPBF 40C to 125C LQFN (Laminate LTC3315BJV TRMPBF LTC3315BJV TRPBF 40C to 150C LHFZ e4 Package with QFN MSL 3 Footprint) LTC3315BHV TRMPBF LTC3315BHV TRPBF 40C to 150C LTC3315BMPV TRMPBF LTC3315BMPV TRPBF 55C to 150C AUTOMOTIVE PRODUCTS** LTC3315BEV WTRMPBF LTC3315BEV WTRPBF 40C to 125C LQFN (Laminate LTC3315BIV WTRMPBF LTC3315BIV WTRPBF 40C to 125C LHFZ e4 Package with QFN MSL 3 LTC3315BJV WTRMPBF LTC3315BJV WTRPBF 40C to 150C Footprint) LTC3315BHV WTRMPBF LTC3315BHV WTRPBF 40C to 150C Contact the factory for parts specified with wider operating temperature Recommended LGA and BGA PCB Assembly and Manufacturing ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609. Procedures Device temperature grade is indicated by a label on the shipping container. LGA and BGA Package and Tray Drawings TRM = 500 pieces. 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. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at T = 25C (Notes 2, 3). V = 3.3V unless otherwise specified. A IN PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply l Operating Supply Voltage (V ) 2.25 5.5 V IN Rev. 0 2 For more information www.analog.com PGOOD MODE/SYNC SW2 SW1