POWER LOSS (W) LTC3616 6A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter Fea T Descrip T n 6A Output Current The LTC 3616 is a low quiescent current monolithic syn- n 2.25V to 5.5V Input Voltage Range chronous buck regulator using a current mode, constant n Low Output Ripple Burst Mode Operation: I = 75A frequency architecture. The no-load DC supply current Q n 1% Output Voltage Accuracy in sleep mode is only 70A while maintaining the output n Output Voltage Down to 0.6V voltage (Burst Mode operation) at no load, dropping to n High Efficiency: Up to 95% zero current in shutdown. The 2.25V to 5.5V input supply n Low Dropout Operation: 100% Duty Cycle voltage range makes the LTC3616 ideally suited for single n Programmable Slew Rate on SW Node Reduces Li-Ion as well as fixed low voltage input applications. 100% Noise and EMI duty cycle capability provides low dropout operation, n Adjustable Switching Frequency: Up to 4MHz extending the operating time in battery-powered systems. n Optional Active Voltage Positioning (AVP) with The operating frequency is externally programmable up to Internal Compensation 4MHz, allowing the use of small surface mount inductors. n Selectable Pulse-Skipping/Forced Continuous/Burst For switching noise-sensitive applications, the LTC3616 Mode Operation with Adjustable Burst Clamp can be synchronized to an external clock at up to 4MHz. n Programmable Soft-Start n Forced continuous mode operation in the LTC3616 reduces Inputs for Start-Up Tracking or External Reference n noise and RF interference. Adjustable compensation allows DDR Memory Mode, I = 3A OUT n the transient response to be optimized over a wide range Available in a 24-Pin 3mm 5mm QFN of loads and output capacitors. Thermally Enhanced Package The internal synchronous switch increases efficiency and a T eliminates the need for an external catch diode, saving n Point-of-Load Supplies external components and board space. The LTC3616 n Distributed Power Supplies is offered in a leadless 24-pin 3mm 5mm thermally n Portable Computer Systems enhanced QFN package. n DDR Memory Termination L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n of Linear Technology Corporation. All other trademarks are the property of their respective owners. Handheld Devices Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 6498466, 6611131. Efficiency and Power Loss Typical a T vs Load Current 100 V IN 2.7V TO 5.5V 90 22F 4 SV PV 80 1 IN IN RUN SRLIM/DDR 70 TRACK/SS 60 0.1 RT/SYNC 220nH V OUT LTC3616 SW 2.5V 50 6A PGOOD SGND 47F 40 0.01 2 ITH PGND 30 MODE V FB 665k 3616 TA01a 20 0 V = 2.8V IN V = 3.3V 210k 10 IN V = 5V V = 2.5V OUT IN 0 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3616 TA01b 3616fc 1 For more information www.linear.com/LTC3616 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3616 a T e Maxi Mu M r a T p c F T (Note 1) TOP VIEW PV , SV Voltages ..................................... 0.3V to 6V IN IN SW Voltage ................................. 0.3V to (PV + 0.3V) IN ITH, RT/SYNC Voltages ............... 0.3V to (SV + 0.3V) IN 24 23 22 21 SRLIM, TRACK/SS Voltages ....... 0.3V to (SV + 0.3V) IN MODE, RUN, V Voltages .......... 0.3V to (SV + 0.3V) FB IN SRLIM/DDR 1 20 PGOOD PGOOD Voltage ............................................ 0.3V to 6V RT/SYNC RUN 2 19 Operating Junction Temperature Range SGND 3 18 SV IN (Notes 2, 11) .......................................... 55C to 150C PV 4 17 PV IN IN 25 SW 5 16 SW Storage Temperature.............................. 65C to 150C SW 6 15 SW Reflow Peak Body Temperature (QFN) ..................260C SW SW 7 14 SW 8 13 SW 9 10 11 12 UDD PACKAGE 24-LEAD (3mm 5mm) PLASTIC QFN T = 150C, = 38C/W JMAX JA EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB D F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3616EUDD PBF LTC3616EUDD TRPBF LDYG 24-Lead (3mm 5mm) Plastic QFN 40C to 125C LTC3616IUDD PBF LTC3616IUDD TRPBF LDYG 24-Lead (3mm 5mm) Plastic QFN 40C to 125C LTC3616HUDD PBF LTC3616HUDD TRPBF LDYG 24-Lead (3mm 5mm) Plastic QFN 40C to 150C LTC3616MPUDD PBF LTC3616MPUDD TRPBF LDYG 24-Lead (3mm 5mm) Plastic QFN 55C 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. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: