POWER LOSS (W) LTC3623 15V, 5A Rail-to-Rail Synchronous Buck Regulator Fea T Descrip T n Single Resistor Programmable V 0V to V 0.5V The LTC 3623 is a high efficiency, monolithic synchro- OUT: IN n Silent Switcher Architecture nous buck regulator in which the output voltage is pro- n I Accuracy: 1% grammed with a single external resistor. The accurate ISET n Tight V Regulation Across V Range internally generated 50A current source on the ISET pin OUT OUT n Output Current Monitor Accuracy: 5% allows the user to program an output voltage from 0V n Programmable Wire Drop Compensation to 0.5V below V . The user can also directly drive the IN n Easy to Parallel for Higher Current and Heat Spreading ISET pin with an external voltage supply to program the n Input Supply Voltage Regulation Loop converters V . The V voltage is fed directly back OUT OUT n High Efficiency: Up to 96% to the error amplifier to be regulated to the ISET voltage. n Output Current: 5A The operating supply voltage range for the SV pin is from IN n Integrated N-MOSFETs (60m Top & 30m Bottom) 15V down to 4V, while the PV pins voltage range is 15V IN n Adjustable Switching Frequency: 400kHz to 4MHz down to 1.5V, making it suitable for dual Li-Ion batteries n V Range: 4V to 15V and for taking power from a 12V or 5V rail. IN n Current Mode Operation for Excellent Line and Load The operating frequency is programmable from 400kHz Transient Response to 4MHz with an external R resistor. Higher switching fre- T n Shutdown Mode Draws Less Than 1A Supply Current quency allows the use of smaller surface mount inductors n Low Profile 24-Lead 3mm 5mm QFN Package while lower frequency allows for higher power efficiency. The unique constant-frequency/controlled on-time a T architecture is ideal for high step-down ratio applications n Tracking Supply or DDR Memory Supply that are operating at high frequency while demanding fast n ASIC Substrate Biasing transient response. n Point-of-Load (POL) Power Supply L, LT, LTC, LTM, OPTI-LOOP, Silent Switcher, Linear Technology and the Linear logo are n Portable Instruments, Battery-Powered Equipment registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5847554, 6580258. n Thermo Electric Cooler (TEC) Systems Typical a T Efficiency and Power Loss V IN vs Load Current (5.5V TO 15V) BOOST PV IN 100 3.0 V = 12V IN SV LTC3623EUD IN 90 V = 5V OUT 0.1F 80 2.4 50A RUN DCM PWM 70 CONTROL 1H 22F V OUT POWER SW AND 60 1.8 5V LOSS ERROR SWITCH 5A 50 AMP DRIVER CCM 47F 40 1.2 PGND 30 V OUT 20 0.6 CCM I /50k OUT 10 VIN REG DCM 0 0 0.001 0.01 0.1 1 10 3623 TA01 LOAD CURRENT (A) 3623 TA01a 100k 10k 1F 0.1F 10nF 3623fa 1 For more information www.linear.com/LTC3623 ISET IMON MODE/ SYNC INTV CC RT PGFB ITH PGOOD LOAD EFFICIENCY (%) ion pplica ions pplica ion uresLTC3623 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW PV , SV Voltage ..................................... 0.3V to 17V IN IN V , ISET Voltage .........................................0.3 to V OUT IN BOOST Voltage .............................. SW 0.3V to SW+6V 24 23 22 21 RUN Voltage.............................................. 0.3V to SV IN ISET 1 20 PGFB MODE/SYNC Voltage ................................... 0.3V to 6V 2 PGOOD 19 INTV CC ITH, RT, VIN REG Voltage ....................0.3V to INTV CC RUN 3 18 BOOST IMON, PGOOD, PGFB Voltage ...............0.3V to INTV GSNS 4 17 S VIN CC 25 PGND PV 5 16 P GSNS Voltage .............................................0.3V to 12V IN VIN SW 6 15 SW Operating Junction Temperature Range 7 NC 14 NC (Notes 4, 5) ............................................. 40C to 125C MODE/SYNC 8 13 V OUT 9 10 11 12 UDD PACKAGE 24-LEAD (3mm 5mm) PLASTIC QFN T = 125C, = 36C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB o r Der i n F Ma T (