LT8652S Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16A Quiescent Current FEATURES DESCRIPTION n Silent Switcher 2 Architecture: The LT 8652S is a dual step-down regulator that deliv- n Ultralow EMI on Any PCB ers up to 8.5A of continuous current from both channels n Eliminates PCB Layout Sensitivity and supports loads up to 12A from each channel. The n Internal Bypass Capacitors Reduce Radiated EMI LT8652S uses second generation Silent Switcher technol- n Spread Spectrum Frequency Modulation ogy including integrated bypass capacitors to deliver a n 8.5A DC from Each Channel Simultaneously high frequency, high efficiency, small solution with excel- n Up to 12A on Either Channel lent EMI performance. The LT8652S is ideal for noise n Ultralow Quiescent Current Burst Mode Operation: sensitive applications such as PLLs and high bandwidth n 16A I Regulating 12V to 3.3V (Both Channels) data and communications systems. Q IN OUT n Output Ripple <10mV P-P The fast, clean, low overshoot switching edges enable n 1.2% 600mV Feedback Voltage with Remote Sense high efficiency operation even at high switching frequen- n Output Current Monitor Pins with Current Limiting cies, enabling a wide control loop bandwidth for fast tran- n Forced Continuous Mode sient response. Output current monitoring and limiting n CLKOUT for Up to 4-Phase Operation allows inductors to be selected for the maximum output n 93.6% Efficiency at 6A, 3.3V from 12V at1MHz OUT IN current in a given application. Differential output voltage n 85.6% Efficiency at 6A, 1.0V from 12V at1MHz OUT IN sensing provides accurate voltage regulation at the point n Fast Minimum Switch-On Time: 20ns of load for high current applications. The two channels n Adjustable and Synchronizable: 300kHz to 3MHz can be combined to deliver 17A, and two LT8652S ICs n Small 4mm 7mm 36-Pin LQFN Package can be combined for a 4-phase, 34A supply. n AEC-Q100 Qualified for Automotive Applications All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 8823345. APPLICATIONS n Server Power Applications n General Purpose Step-Down TYPICAL APPLICATION 3.3V/8.5A, 1.0V/8.5A 1.5MHz Step-Down Converter Efficiency 100 V V V = V = 12V IN1 IN2 IN1 IN2 V V IN1 IN2 95 3.6V TO 18V 3.0V TO 18V f = 1.5MHz SW 10F 10F EN 90 85 BIAS V 1H 0.3H V OUT1 OUT2 80 3.3V 1.0V SW1 SW2 75 8.5A 8.5A 70 10pF 1M 665k 10pF 330F 65 220F LT8652S FB1 FB2 1210 1210 60 X5R X5R 221k 1M 55 SNSGND1 SNSGND2 50 SS1 SS2 CH1 3.3V 45 10nF 10nF CH2 1V 40 0 2 4 6 8 10 12 IMON1 IMON2 LOAD CURRENT (A) RT V GND SYNC CC 8652S TA01b 5.11k 27.4k 5.11k 1F 8652S TA01a f = 1.5MHz SW Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8652S ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V , V , EN, PG1, PG2 ...........................................18V IN1 IN2 TOP SIDE BIAS ..........................................................................12V FB1, FB2, VC1, VC2, SS1, SS2, IMON1, IMON2 ........4V SYNC........................................................................6V 36 35 34 33 32 31 Operating Junction Temperature Range (Note 2) IMON2 1 30 IMON1 LT8652SE .......................................... 40C to 125C SS2 2 29 SS1 LT8652SI ........................................... 40C to 125C 37 38 RT 3 GND GND 28 V CC Storage Temperature Range .............. 65C to 150C GND 4 27 BIAS Maximum Reflow (Package Body) Temperature ...260C V 5 26 BST1 IN1 V 6 25 SW1 IN1 39 40 GND GND V 7 24 SW1 IN1 NC 8 23 SW1 V 9 22 SW2 IN2 41 42 V 10 21 SW2 IN2 GND GND V 11 20 SW2 IN2 GND 12 19 BST2 13 14 15 16 17 18 LQFN PACKAGE 36-LEAD (4mm 7mm 0.94mm) = 18C/W, = 24.6C/W, = 4.2C/W JA JCTOP JCbot EXPOSED PAD (PINS 37, 38, 39, 40, 41, 42) ARE GND, MUST BE SOLDERED TO PCB NOTES: 1. VALUES ARE DETERMINED BY SIMULATION PER JESD51 CONDITIONS 2. VALUE IS OBTAINED WITH DEMO BOARD JA ORDER INFORMATION PART MARKING* PACKAGE** MSL TEMPERATURE RANGE PART NUMBER TAPE AND REEL PAD OR BALL FINISH DEVICE FINISH CODE TYPE RATING (SEE NOTE 2) LT8652SEV PBF LT8652SEV TRPBF Au (RoHS) 8652SV e4 LQFN 3 40C to 125C LT8652SIV PBF LT8652SIV TRPBF Au (RoHS) 8652SV e4 LQFN 3 40C to 125C AUTOMOTIVE PRODUCTS* LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8652SEV WPBF LT8652SEV WTRPBF Au (RoHS) 8652SV e4 LQFN 3 40C to 125C LT8652SIV WPBF LT8652SIV WTRPBF Au (RoHS) 8652SV e4 LQFN 3 40C to 125C Device temperature grade is indicated by a label on the shipping container. **The LT8652S package has the same dimensions as a standard 4mm7mm QFN package. Pad or ball finish code is per IPC/JEDEC J-STD-609. *LQFN is Laminate Package with QFN footprint Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of 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 EN VC2 TEMP FB2 PG2 SNSGND2 PG1 SNSGND1 SYNC FB1 CLKOUT VC1