POWER LOSS (W) LTC3614 4A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter Fea T Descrip T n 4A Output Current The LTC 3614 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 75A 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 LTC3614 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 LTC3614 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 LTC3614 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 LTC3614 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 10F 4 SV PV 80 1 IN IN RUN SRLIM/DDR 70 TRACK/SS 60 0.1 RT/SYNC 330nH V OUT LTC3614 SW 2.5V 50 4A PGOOD SGND 40 0.01 47F ITH PGND 2 30 MODE V FB 665k 3614 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) 3614 TA01b 3614fc 1 For more information www.linear.com/LTC3614 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3614 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 PGND SW 6 15 SW 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 LTC3614EUDD PBF LTC3614EUDD TRPBF LFVM 24-Lead (3mm 5mm) Plastic QFN 40C to 125C LTC3614IUDD PBF LTC3614IUDD TRPBF LFVM 24-Lead (3mm 5mm) Plastic QFN 40C to 125C LTC3614HUDD PBF LTC3614HUDD TRPBF LFVM 24-Lead (3mm 5mm) Plastic QFN 40C to 150C LTC3614MPUDD PBF LTC3614MPUDD TRPBF LFVM 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: