LTC3569 Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References Fea T Descrip T n Three Independent Current Mode Buck DC/DC The LTC 3569 contains three monolithic, synchronous Regulators (1.2A and 2 600mA) step-down DC/DC converters. Intended for medium power n Single Pin Programmable V Servo Voltages from applications, it operates over a 2.5V to 5.5V input voltage FB 800mV Down to 425mV (in 25mV Steps) range. The operating frequency is adjustable from 1MHz n Pull V High to Make Each 600mA Buck a Slave for to 3MHz, allowing the use of tiny, low cost capacitors and FB Higher Current Operation inductors. The three output voltages are independently n Pulse-Skipping or Burst Mode Operation programmable by toggling the EN pins up to 15 times, n Programmable Switching Frequency lowering the 800mV FB references by 25mV per cycle. The (1MHz to 3MHz) or Fixed 2.25MHz first buck regulator sources load currents up to 1200mA. n Synchronizable (1.2MHz to 3MHz) The other two buck regulators each provide 600mA. n V Range 2.5V to 5.5V IN The two 600mA buck regulators can also be configured n All Regulators Internally Compensated to operate as slave power stages, running in parallel with n PGOOD Output Flag another internal buck regulator to supply higher load n Quiescent Current <100A (All Regulators in Burst currents. When operating as parallel, slave output stages, Mode Operation) discrete external components are shared and available n Zero Shutdown Current output currents sum together. n Overtemperature and Short-Circuit Protection L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Tiny 3mm 3mm, 3mm 4mm 20-Lead QFN and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6127815, 6304066, Thermally Enhanced TSSOP FE-16 Packages 6498466, 6580258, 6611131, 7170195. a T n Portable Applications with Multiple Supply Rails n General Purpose Step-Down DC/DC n Dynamic Voltage Scaling Applications Typical a T V IN 2.2H* OUT1 = 2.5V SV PV SW1 Efficiency vs Load Current IN IN 22F 1200mA 20pF 510k 10F 100 V = 3V IN EN1 FB1 90 240k EN2 80 LTC3569 EN3 2.5H** V = 5V 70 IN OUT2 = 1.8V MODE SW2 600mA 60 R 20pF 300k 4.7F T 50 FB2 40 240k PGOOD 30 2.5H** OUT3 = 1.2V 20 SW3 Burst Mode OPERATION 600mA 20pF 4.7F PULSE-SKIPPING 150k 10 OUT1 = 2.5V FB3 0 * WURTH 7440430022 0.01 0.1 1 10 100 1000 10000 300k SGND PGND ** WURTH 744031002 I (mA) LOAD 3569 TA01b 3569 TA01a 3569fe 1 For more information www.linear.com/LTC3569 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3569 (Notes 1, 6) a Te Maxi Mu M r a T SV Voltage .........................0.3V to 6V (7V Transient) Operating Junction Temperature Range IN PV Voltage .........................S 0.3V to S + 0.3V (Notes 6, 7) ............................................ 40C to 125C INX VIN VIN ENx, MODE, PGOOD, SWx, FBx ..... 0.3V to S + 0.3V Storage Temperature Range .................. 65C to 125C VIN R Voltage .................................................... 0.3V to 6V Peak Reofl w Temperature .....................................260C T PGOOD Current ...................................................... 1mA p in c F T TOP VIEW TOP VIEW TOP VIEW FB3 1 16 FB1 20 19 18 17 SV 2 15 FB2 IN 20 19 18 17 16 PGND2 1 16 SW3 SGND 3 14 R T 15 SW3 SW2 1 SW2 2 15 PGND3 EN3 4 13 MODE 14 PGND3 PV 2 IN2 17 PV EN1 3 14 IN2 21 EN2 5 12 PGOOD 21 EN1 PGOOD 3 13 GND PGOOD 4 13 EN2 4 EN2 EN1 6 11 PV MODE 12 IN2 MODE 5 12 EN3 5 11 EN3 R SW3 7 10 SW2 T R 6 11 SGND T 6 7 8 10 9 *PV 8 9 SW1 IN1 7 8 9 10 FE PACKAGE UD PACKAGE 16-LEAD PLASTIC TSSOP 20-LEAD (3mm 3mm) PLASTIC QFN T = 125C, = 38C/W UDC PACKAGE JMAX JA T = 125C, = 68C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB 20-LEAD (3mm 4mm) PLASTIC QFN JMAX JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB *SHARES POWER WITH PV IN3 T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3569EUD PBF LTC3569EUD TRPBF LDQF 40C to 125C 20-Lead (3mm 3mm) Plastic QFN LTC3569IUD PBF LTC3569IUD TRPBF LDQF 40C to 125C 20-Lead (3mm 3mm) Plastic QFN LTC3569EUDC PBF LTC3569EUDC TRPBF LFYW 20-Lead (3mm 4mm) Plastic QFN 40C to 125C LTC3569IUDC PBF LTC3569IUDC TRPBF LFYW 20-Lead (3mm 4mm) Plastic QFN 40C to 125C LTC3569EFE PBF LTC3569EFE TRPBF 3569FE 16-Lead Plastic TSSOP 40C to 125C LTC3569IFE PBF LTC3569IFE TRPBF 3569FE 16-Lead Plastic TSSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is 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: