POWER LOSS (mW) LT3580 Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization FEATURES DESCRIPTION n 2A Internal Power Switch The LT 3580 is a PWM DC/DC converter containing an n Adjustable Switching Frequency internal 2A, 42V switch. The LT3580 can be configured n Single Feedback Resistor Sets V as either a boost, SEPIC or inverting converter. Capable OUT n Synchronizable to External Clock of generating 12V at 550mA or 12V at 350mA from a n High Gain SHDN Pin Accepts Slowly Varying 5V input, the LT3580 is ideal for many local power supply Input Signals designs. n Wide Input Voltage Range: 2.5V to 32V The LT3580 has an adjustable oscillator, set by a resistor n Low V Switch: 300mV at 1.5A (Typical) CESAT from the RT pin to ground. Additionally, the LT3580 can n Integrated Soft-Start Function be synchronized to an external clock. The free running or n Easily Configurable as a Boost or Inverting Converter synchronized switching frequency range of the part can n User Configurable Undervoltage Lockout (UVLO) be set between 200kHz and 2.5MHz. n Tiny 8-Lead 3mm 3mm DFN and 8-Lead MSOP The LT3580 also features innovative SHDN pin circuitry Packages that allows for slowly varying input signals and an adjust- able undervoltage lockout function. APPLICATIONS Additional features such as frequency foldback and n VFD Bias Supplies soft-start are integrated. The LT3580 is available in tiny n TFT-LCD Bias Supplies 3mm 3mm 8-lead DFN and 8-lead MSOP packages. n GPS Receivers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n DSL Modems Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Local Power Supply TYPICAL APPLICATION 1.2MHz, 5V to 12V Boost Converter Achieves Over 88% Efficiency Efficiency and Power Loss 95 1200 4.2H V OUT V IN 90 12V 5V 1000 550mA 85 10F V SW IN 80 800 SHDN GND LT3580 130k 75 RT FB 600 70 VC SYNC SS 10k 65 400 2.2F 75k 0.1F 1nF 60 200 3580 TA01 55 50 0 0 100 200 300 600 400 500 LOAD CURRENT (mA) 3580 TA01b 3580fg 1 EFFICIENCY (%)LT3580 ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................. 0.3V to 32V Operating Junction Temperature Range IN SW Voltage ................................................ 0.4V to 42V LT3580E (Notes 2, 5) .........................40C to 125C RT Voltage ...................................................0.3V to 5V LT3580I (Notes 2, 5) ..........................40C to 125C SS and FB Voltage ....................................0.3V to 2.5V LT3580H (Notes 2, 5) ........................40C to 150C VC Voltage ...................................................0.3V to 2V LT3580MP (Notes 2, 5) ..................... 55C to 125C SHDN Voltage ............................................ 0.3V to 32V Storage Temperature Range ..................65C to 150C SYNC Voltage ............................................ 0.3V to 5.5V PIN CONFIGURATION TOP VIEW TOP VIEW FB 1 8 SYNC FB 1 8 SYNC VC 2 7 SS VC 2 9 7 SS 9 V 3 GND 6 RT GND IN V RT 3 6 IN 5 SW 4 SHDN SW SHDN 4 5 MS8E PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE = 35C/W TO 40C/W JA 8-LEAD (3mm 3mms ) PLASTIC DFN EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3580EDD PBF LT3580EDD TRPBF LCXY 8-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3580IDD PBF LT3580IDD TRPBF LCXY 8-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3580EMS8E PBF LT3580EMS8E TRPBF LTDCJ 8-Lead Plastic MSOP 40C to 125C LT3580IMS8E PBF LT3580IMS8E TRPBF LTDCJ 8-Lead Plastic MSOP 40C to 125C LT3580HMS8E PBF LT3580HMS8E TRPBF LTDCJ 8-Lead Plastic MSOP 40C to 150C LT3580MPMS8E PBF LT3580MPMS8E TRPBF LTDCJ 8-Lead Plastic MSOP 55C 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: