POWER LOSS (W) LTC3622/ LTC3622-2/LTC3622-23/5 17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current FEATURES DESCRIPTION n Dual Step-Down Outputs: 1A Per Channel The LTC 3622 is a dual 1A output, high efficiency synchro- n Wide V Range: 2.7V to 17V nous monolithic step-down regulator capable of operating IN n Wide V Range: 0.6V to V from input supplies up to 17V. The switching frequency is OUT IN n Up to 95% Efficiency fixed to 1MHz or 2.25MHz with a 50% synchronization n No-Load I = 5A with Both Channels Enabled range to an external clock. The regulator features ultralow Q I < 4A with Only One Channel Enabled quiescent current and high efficiency over a wide output Q n High Efficiency, Low Dropout Operation voltage range. (100% Duty Cycle) The step-down regulators operate from an input voltage n Constant Frequency (1MHz/2.25MHz) with External range of 2.7V to 17V and provide an adjustable output Frequency Synchronization from 0.6V to V while delivering up to 1A of output cur- IN n 1% Output Voltage Accuracy rent. A user-selectable mode input is provided to allow n Current Mode Operation for Excellent Line and Load the user to trade off ripple noise for light load efficiency. Transient Response Burst Mode operation provides the highest efficiency at n Phase Shift Programmable with External Clock light loads, while pulse-skipping mode provides the lowest n Selectable Current Limit ripple noise. The switching regulators can be synchronized n Internal Compensation and Soft-Start to an external clock. Furthermore, fixed V options are OUT n Compact 14-Pin DFN (3mm 4mm) and 16-Lead available to eliminate the external feedback resistors. MSOP Packages List of LTC3622 Options PART NAME FREQUENCY V OUT APPLICATIONS LTC3622 1.00MHz Adjustable n Battery Powered Systems LTC3622-2 2.25MHz Adjustable n Point-of-Load Supplies LTC3622-23/5 2.25MHZ 5V/3.3V n Portable Handheld Scanners L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6580258, 6498466, 6611131, 5705919. TYPICAL APPLICATION Efficiency vs Load Current 2.5V/5V V Application, f = 1MHz OUT SW 100 0.6 90 V IN V INTV IN1 CC 5.5V TO 17V 0.5 80 V IN2 MODE/SYNC C C1 IN 70 RUN1 0.4 10F 1F RUN2 PHASE 60 I LIM 50 0.3 LTC3622 40 V 4.7H 6.8H V 0.2 V = 2.5V OUT1 OUT2 OUT1 30 2.5V SW1 SW2 5V V = 5V OUT2 1A 1A 20 V = 12V IN 0.1 22pF 619k 619k 22pF f = 1MHz SW C C 10 OUT1 OUT2 FB1 FB2 BURST MODE OPERATION 22F 22F GND 0 0 196k 84.5k 0.0001 0.001 0.01 0.1 1 LOAD CURRENT (A) 3622 TA01b 3622 TA01 3622fb 1 For more information www.linear.com/LTC3622 EFFICIENCY (%)LTC3622/ LTC3622-2/LTC3622-23/5 ABSOLUTE MAXIMUM RATINGS (Note 1) Operating Junction Temperature Range (Note 3) V , V SV (MSOP Only) (Note 2) ....... 0.3V to 17V IN1 IN2, IN LTC3622E .......................................... 40C to 125C RUN1, RUN2 .............................................. 0.3V to 17V LTC3622I ........................................... 40C to 125C MODE/SYNC, FB1, FB2 ................................ 0.3V to 6V LTC3622H .......................................... 40C to 150C PGOOD1, PGOOD2, I , PHASE .................. 0.3V to 6V LIM Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 14 SW1 IN1 V 1 16 SW1 IN1 PGOOD1 2 13 RUN1 SV 2 15 NC IN MODE/SYNC 3 12 FB1 3 14 RUN1 PGOOD1 15 17 MODE/SYNC 4 13 FB1 PHASE 4 11 INTV GND CC GND PHASE 5 12 INTV CC PGOOD2 5 10 FB2 PGOOD2 6 11 FB2 I 7 10 RUN2 LIM I 6 9 RUN2 LIM V 8 9 SW2 IN2 V 7 8 SW2 IN2 MSE PACKAGE 16-LEAD PLASTIC MSE DE PACKAGE T = 150C, = 40C/W, = 10C/W JMAX JA JC 14-LEAD (4mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB T = 150C, = 40C/W, = 4.4C/W JMAX JA JC EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3622EDE PBF LTC3622EDE TRPBF 3622 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622IDE PBF LTC3622IDE TRPBF 3622 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622HDE PBF LTC3622HDE TRPBF 3622 14-Lead (3mm x 4mm) Plastic DFN 40C to 150C LTC3622EMSE PBF LTC3622EMSE TRPBF 3622 16-Lead Plastic MSOP 40C to 125C LTC3622IMSE PBF LTC3622IMSE TRPBF 3622 16-Lead Plastic MSOP 40C to 125C LTC3622HMSE PBF LTC3622HMSE TRPBF 3622 16-Lead Plastic MSOP 40C to 150C LTC3622EDE-2 PBF LTC3622EDE-2 TRPBF 36222 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622IDE-2 PBF LTC3622IDE-2 TRPBF 36222 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622HDE-2 PBF LTC3622HDE-2 TRPBF 36222 14-Lead (3mm x 4mm) Plastic DFN 40C to 150C LTC3622EMSE-2 PBF LTC3622EMSE-2 TRPBF 36222 16-Lead Plastic MSOP 40C to 125C LTC3622IMSE-2 PBF LTC3622IMSE-2 TRPBF 36222 16-Lead Plastic MSOP 40C to 125C LTC3622HMSE-2 PBF LTC3622HMSE-2 TRPBF 36222 16-Lead Plastic MSOP 40C to 150C LTC3622EDE-23/5 PBF LTC3622EDE-23/5 TRPBF 223/5 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622IDE-23/5 PBF LTC3622IDE-23/5 TRPBF 223/5 14-Lead (3mm x 4mm) Plastic DFN 40C to 125C LTC3622HDE-23/5 PBF LTC3622HDE-23/5 TRPBF 223/5 14-Lead (3mm x 4mm) Plastic DFN 40C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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