POWER LOSS (W) LTC3411A 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter Fae Tseru Dpircse Tnoi n Uses Tiny Capacitors and Inductor The LTC 3411A is a constant frequency, synchronous n High Frequency Operation: Up to 4MHz step-down DC/DC converter. Intended for medium power n Low R Internal Switches: 0.15 applications, it operates from a 2.5V to 5.5V input voltage DS(ON) n High Efficiency: Up to 96% range and has a user configurable operating frequency up n Selectable Low Ripple (25mV ) Burst Mode to 4MHz, allowing the use of tiny, low cost capacitors and P-P Operation: I = 40A inductors 1mm or less in height. The output voltage is Q n Stable with Ceramic Capacitors adjustable from 0.8V to 5.5V. Internal synchronous power n Current Mode Operation for Excellent Line switches provide high efficiency. The LTC3411As current and Load Transient Response mode architecture and external compensation allow the n Short-Circuit Protected transient response to be optimized over a wide range of n Low Dropout Operation: 100% Duty Cycle loads and output capacitors. n Low Shutdown Current: I 1A Q The LTC3411A can be configured for automatic power n Output Voltages from 0.8V to 5V saving Burst Mode operation (I = 40A) to reduce gate Q n Synchronizable to External Clock charge losses when the load current drops below the level n Supports Pre-Biased Outputs required for continuous operation. For reduced noise and n Small 10-Lead 3mm 3mm DFN or MSOP Package RF interference, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation. a acilpp Tsnoi To further maximize battery life, the P-channel MOSFET n Notebook Computers is turned on continuously in dropout (100% duty cycle). n Digital Cameras In shutdown, the device draws <1A. n Cellular Phones L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and OPTI-LOOP are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology n Handheld Instruments Corporation. All other trademarks are the property of their respective owners. Protected by U.S. n Patents including 5481178, 6580258, 6498466, 6611131. Board Mounted Power Supplies T lacipy a acilpp Tnoi Efficiency and Power Loss vs Output Current Step-Down 2.5V/1.25A Regulator 100 1 V IN 2.5V TO 5.5V 90 80 10F 0.1 70 SYNC SYNC/MODE PV IN 60 PGOOD SV IN 2.2H V OUT 50 0.01 SW 2.5V LTC3411A 1.25A 22pF 40 30 0.001 I 22F TH V = 2.7V 887k 20 IN V = 3.6V SHDN/R V T FB IN 12.1k 10 V = 4.2V IN SGND PGND 0 0.0001 549k 412k 680pF 0.1 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3411a TA01a f = 1MHz O 3411A TA01b Burst Mode OPERATION 3411afb EFFICIENCY (%)LTC3411A a ulosb T e Mixa Mu M r a Tsgni (Note 1) PV , SV Voltages .................................... 0.3V to 6V Operating Junction Temperature Range IN IN V , I , SHDN/R Voltages ......... 0.3V to (V + 0.3V) (Notes 2, 5, 8) ........................................ 40C to 125C FB TH T IN SYNC/MODE Voltage ................... 0.3V to (V + 0.3V) Storage Temperature Range .................. 65C to 125C IN SW Voltage ................................. 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec)...................300C IN PGOOD Voltage ........................................... 0.3V to 6V p ni c no Farugi Tnoi TOP VIEW TOP VIEW 10 SHDN/R 1 I T TH SHDN/R 1 10 I SYNC/MODE 2 9 V T TH FB SYNC/MODE 2 9 V FB 11 SGND 3 8 PGOOD SGND 3 8 PGOOD SW 4 7 SV IN SW 4 7 SV IN PGND 5 6 PV IN PGND 5 6 PV IN MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 120C/W JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB o r D re i n Fro Ma Tnoi LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3411AEDD PBF LTC3411AEDD TRPBF LAJM 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3411AIDD PBF LTC3411AIDD TRPBF LAJM 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3411AEMS PBF LTC3411AEMS TRPBF LTAJK 10-Lead Plastic MSOP 40C to 125C LTC3411AIMS PBF LTC3411AIMS TRPBF LTAJK 10-Lead Plastic MSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: