POWER LOSS (mW) LTC3568 1.8A, 4MHz, Synchronous Step-Down DC/DC Converter Fae Tseru Dpircse Tnoi n Uses Tiny Capacitorsand Inductor The LTC 3568 is a constant frequency, synchronous n High Frequency Operation: Up to 4MHz step- down DC/DC converter. Intended for medium power n LowR Internal Switches: 0.110 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 n Stable with Ceramic Capacitors up to 4MHz, allowing the use of tiny, low cost capacitors n Current Mode Operation for Excellent Line and inductors 2mm or less in height. The output voltage and Load Transient Response is adjustable from 0.8V to 5V. Internal sychronous 0.11 n Short-Circuit Protected power switches with 2.4A peak current ratings provide n Low Dropout Operation: 100% Duty Cycle high efficiency. The LTC3568s current mode architecture n Low Shutdown Current: I 1A and external compensation allow the transient response Q n Low Quiescent Current: 60A to be optimized over a wide range of loads and output n Output Voltages from 0.8V to 5V capacitors. n Selectable Burst Mode Operation The LTC3568 can be configured for automatic power sav- n Sychronizable to External Clock ing Burst Mode operation to reduce gate charge losses n Small 3mm 3mm, 10-Lead DFN Package when the load current drops below the level required for continuous operation. For reduced noise and RF interfer- a acilpp Tsnoi ence, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation. n Notebook Computers n Digital Cameras To further maximize battery life, the P-channel MOSFET n Cellular Phones is turned on continuously in dropout (100% duty cycle) n Handheld Instruments with a low quiescent current of 60A. In shutdown, the n Board Mounted Power Supplies device draws <1A. L, LT, LTC, LTM, Linear Technology, the Linear logo, OPTI-LOOP and Burst Mode are registered trademarks 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, 6580258, 6304066, 6127815, 6611131. T lacipy a acilpp Tnoi Efficiency vs Load Current V IN 2.5V TO 5.5V 100 1000 22F 95 EFFICIENCY V SYNC/MODE PV IN IN L1 90 100 PGOOD SV IN 2H V OUT SW 2.5V/1.8A LTC3568 85 I 22F + 10F POWER LOSS TH 887k SHDN/R V T FB 80 13k 10 V = 3.3V SGND PGND IN V = 2.5V OUT 324k 412k 1000pF 75 f = 1MHz O Burst Mode OPERATION 70 1 NOTE: IN DROPOUT, THE OUTPUT TRACKS 3568 F01 1 10 100 1000 10000 THE INPUT VOLTAGE LOAD CURRENT (mA) 3568 TA01 Figure 1. Step-Down 1.8A Regulator 3568fa EFFICIENCY (%)LTC3568 a ulosb T e Mixa Mu M r a Tsgni p ni c no Farugi Tnoi (Note1) TOP VIEW PV , SV Voltages ..................................... 0.3V to 6V IN IN SHDN/R 1 10 I V , I , SHDN/R Voltages .......... 0.3V to (V + 0.3V) T TH FB TH T IN SYNC/MODE 2 9 V FB SYNC/MODE Voltage .................... 0.3V to (V + 0.3V) IN 11 SGND 3 8 PGOOD SW Voltage ................................... 0.3V to (V + 0.3V) IN SW 4 7 SV IN PGOOD Voltage ............................................ 0.3V to 6V PGND 5 6 PV IN Operating Junction Temperature Range DD PACKAGE (Note 2) .............................................40C to 125C 10-LEAD (3mm 3mm) PLASTIC DFNs T = 125C, = 43C/W, = 3C/W JMAX JA JC Junction Temperature (Notes 5, 8) ........................ 125C EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ..................65C to 125C o r D re i n Fro Ma Tnoi LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURERANGE LTC3568EDD PBF LTC3568EDD TRPBF LCSG 40C to 125C 10-Lead (3mm 3mm) Plastic DFN LTC3568IDD PBF LTC3568IDD TRPBF LCSG 40C to 125C 10-Lead (3mm 3mm) Plastic DFN LEAD BASED FINISH TAPE AND REEL PARTMARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3568EDD LTC3568EDD TR LCSG 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3568IDD LTC3568IDD TR LCSG 10-Lead (3mm 3mm) Plastic DFN 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. For more information on lead free part marking, go to: