LT8653S Dual Channel 2A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2A Quiescent Current FEATURES DESCRIPTION n Silent Switcher 2 Architecture: The LT 8653S is a dual step-down regulator that n Ultralow EMI on Any PCB delivers up to 2A of continuous current from both n Eliminates PCB Layout Sensitivity channels and supports loads up to 3A from each n Internal Bypass Capacitors Reduce Radiated EMI channel. The LT8653S features the second generation n Optional Spread Spectrum Modulation Silent Switcher architecture to minimize EMI emissions n 2A DC from Each Channel Simultaneously while delivering high efficiency at high switching n Up to 3A on Either Channel frequencies. This includes integration of bypass n Ultralow Quiescent Current Burst Mode Operation: capacitors to optimize high frequency current loops and n 6.2A I Regulating 12V to 5V and 3.3V make it easy to achieve advertised EMI performance by Q IN OUT1 OUT2 n Output Ripple < 10mV eliminating layout sensitivity. PP n Optional External VC Pin: Fast Transient Response The fast, clean, low overshoot switching edges enable n Forced Continuous Mode high efficiency operation even at high switching n High Efficiency at High Frequency frequencies, leading to a small solution size with wide n 94.1% Efficiency at 1A, 5V from 12V at 2MHz OUT IN control loop bandwidth for fast transient response. n Pin-Selectable Fixed Output Voltages: 5V, 3.3V, 1.8V Burst Mode operation enables ultralow standby current n Fast Minimum Switch-On Time: 30ns consumption or forced continuous mode can be used to n Wide Input Voltage Range: 3.0V to 42V control frequency harmonics across the entire output n Adjustable and Synchronizable: 300kHz to 3MHz load range. The LT8653S is a full featured, customizable n Fixed Output Pin Strap Options voltage regulator, but also has several pin strap options n Internal 2MHz f with Fast Internal Compensation SW to select internal 2MHz switching frequency, internal n Small 4mm 3mm 20-Pin LQFN Package compensation and internal feedback resistor divider n AEC-Q100 Qualified for Automotive Applications options to create a simple, compact two output voltage regulator with only five externalcomponents. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n General Purpose Step-Down n Automotive and Industrial Supplies Efficiency TYPICAL APPLICATION 100 5V/2A, 3.3V/2A 2MHz Step-Down Converter 95 90 V IN 85 V D0 IN 5.6V TO 42V 4.7F EN/UV D1 80 75 V 2.2H 2.2H V OUT1 OUT2 5V SW1 SW2 3.3V 70 2A 2A LT8653S 47F FB1 FB2 100F 65 BIAS 60 VC2 55 VC1 50 RT V GND SYNC CC V = 12V 5V IN OUT 45 f = 2MHz 3.3V SW OUT 40 f = 2MHz 0 0.5 1 1.5 2 2.5 3 8653S TA01a SW LOAD CURRENT (A) 8653S TA01b Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8653S ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , EN/UV, PG1, PG2 ...............................................42V IN BIAS ..........................................................................30V 16 15 14 13 12 11 VC1, VC2, SS1, SS2, D0, D1 .......................................4V RT 17 10 BIAS FB1, FB2, SYNC.........................................................6V EN/UV 18 9 V Operating Junction Temperature Range (Note 2) CC 21 GND LT8653SE .............................................. 40 to 125C V 19 8 SW2 IN LT8653SI ............................................... 40 to 125C V 20 7 SW1 IN Storage Temperature Range ......................65 to 150C 1 2 3 4 5 6 Maximum Reflow (Package Body) Temperature ...260C LQFN PACKAGE 20-LEAD (4mm 3mm 0.94mm) T =125C, =28C/W JMAX JA EXPOSED PAD (PIN 21 IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION PART MARKING* PACKAGE** MSL TEMPERATURE RANGE PART NUMBER PAD OR BALL FINISH DEVICE FINISH CODE TYPE RATING (SEE NOTE 2) LT8653SEV PBF LQFN 3 40C to 125C Au (RoHS) 8653SV e4 (Laminate Package with LT8653SIV PBF 3 40C to 125C QFN Footprint) AUTOMOTIVE PRODUCTS* LT8653SEV WPBF LQFN 3 40C to 125C Au (RoHS) 8653SV e4 (Laminate Package with LT8653SIV WPBF 3 40C to 125C QFN Footprint) Contact the factory for parts specified with wider operating Recommended LGA and BGA PCB Assembly and Manufacturing Procedures temperature ranges. LGA and BGA Package and Tray Drawings *Pad or ball finish code is per IPC/JEDEC J-STD-609. **The LT8653S package has the same dimensions as a standard 4mm3mm QFN package ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T =25C. A PARAMETER CONDITIONS MIN TYP MAX UNITS l Minimum Input Voltage 2.6 3 V V Quiescent Current in Shutdown V =0V, V =0V 1.7 4 A IN EN/UV SYNC l 8 A V + V Quiescent Current in Sleep V =2V, V =V >0.8V, V =V =V , V =0V 3.7 8 A IN CC EN/UV FB1 FB2 VC1 VC2 CC SYNC with Internal Compensation l 16 A V + V Quiescent Current in Sleep V =2V, V =V >0.8V, V =V =Float, V =0V 95 160 A IN CC EN/UV FB1 FB2 VC1 VC2 SYNC l with External Compensation 180 A V + V Quiescent Current V =2V, V =V >0.8V, V =V =V , V =3.4V 7 9 mA IN CC EN/UV FB1 FB2 VC1 VC2 CC SYNC when Active V Current In Regulation V =6V, V =0.8V, Output Load=100A 45 80 A IN IN OUT V =6V, V =0.8V, Output Load=1mA 350 500 A IN OUT Rev. A 2 For more information www.analog.com D0 VC2 D1 FB2 PG2 SS2 PG1 SS1 SYNC FB1 CLKOUT VC1