LTC3530 Wide Input Voltage Synchronous Buck-Boost DC/DC Converter FEATURES DESCRIPTION n Regulated Output with Input Voltages Above, Below The LTC 3530 is a wide V range, highly ef cient, xed IN or Equal to the Output frequency, buck-boost DC/DC converter that operates n 1.8V to 5.5V Input and 1.8V to 5.25V Output Range from input voltages above, below or equal to the output n 250mA Continuous Output Current from 1.8V V voltage. The topology incorporated in the IC provides a IN n 600mA Continuous/1A Peak Output Current from continuous transfer function through all operating modes, Li-Ion making the product ideal for single lithium-ion, two-cell n Single Inductor alkaline or NiMH applications where the output voltage is n Synchronous Recti cation: Up to 96% Ef ciency within the battery voltage range. n Programmable Automatic Burst Mode Operation The LTC3530 is pin compatible with the LTC3440 buck- n Output Disconnect in Shutdown boost DC/DC converter but adds programmable automatic n Pin Compatible with the LTC3440 Burst Mode operation and extends the V /V range to IN OUT n Programmable Frequency from 300kHz to 2MHz 1.8V. Switching frequencies up to 2MHz are programmed n <1A Shutdown Current with an external resistor. Automatic Burst Mode operation n Small Thermally Enhanced 10-Lead (3mm 3mm) allows the user to program the load current threshold for DFN and 10-Lead MS Packages Burst Mode operation using a single resistor from the BURST pin to GND. APPLICATIONS Other features include 1A shutdown, short circuit pro- n MP3 Players tection, programmable soft-start control, current limit n Handheld Instruments and thermal shutdown. The LTC3530 is available in a n Digital Cameras thermally enhanced 10-lead (3mm 3mm) DFN or MSOP n Smart Phones package. n Portable GPS Units L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. n Miniature Hard Disk Drive Power All other trademarks are the property of their respective owners. Patents Pending. TYPICAL APPLICATION Ef ciency 4.7H 100 V = 4.2V IN Burst Mode V = 3.6V IN 90 SW1 SW2 80 V OUT V = 3.6V IN 3.3V AT V OUT 70 250mA 33pF 1.8V TO 5.5V V LTC3530 IN 60 1M 15k 50 FB OFF ON SHDN/SS 40 22F 10k 30 V C V = 2.0V IN R T 576k 20 10F 560pF 10 BURST 33.2k GND 0.01F 0 100k 0.1 1 10 100 1000 LOAD CURRENT (mA) 3530 TA01a 3350 TA01b 3530fb 1 EFFICIENCY (%)LTC3530 (Note 1) ABSOLUTE MAXIMUM RATINGS V , V Voltage ......................................... 0.3V to 6V V , R , FB, SHDN/SS, BURST Voltage .......... 0.3V to 6V IN OUT C T SW1, SW2 Voltage Operating Temperature (Note 2)............... 40C to 85C DC ............................................................ 0.3V to 6V Maximum Junction Temperature (Note 4)............. 125C Pulsed < 100ns ........................................ 0.3V to 7V Storage Temperature Range ................... 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW R 1 10 V T C R 1 10 V T C BURST 2 9 FB BURST 2 9 FB SW1 3 11 8 SHDN/SS SW1 3 8 SHDN/SS SW2 4 7 V SW2 4 7 V IN IN GND 5 6 V OUT GND 5 6 V OUT MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE T = 125C, = 120C/W, = 45C/W 10-LEAD (3mm s 3mm ) PLASTIC DFN JMAX JA JC T = 125C, = 43C/W, = 4.3C/W JMAX JA JC EXPOSED PAD IS GND (PIN 11) MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3530EDD PBF LTC3530EDD TRPBF LCBH 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC3530EMS PBF LTC3530EMS TRPBF LTCBJ 10-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: