POWER LOSS (mW) LT8580 Boost/SEPIC/Inverting DC/DC Converter with 1A, 65V Switch, Soft-Start and Synchronization FEATURES DESCRIPTION n 1A, 65V Power Switch The LT 8580 is a PWM DC/DC converter containing an n Adjustable Switching Frequency internal 1A, 65V switch. The LT8580 can be configured n Single Feedback Resistor Sets V as either a boost, SEPIC or inverting converter. OUT n Synchronizable to External Clock The LT8580 has an adjustable oscillator, set by a resistor n High Gain SHDN Pin Accepts Slowly Varying from the RT pin to ground. Additionally, the LT8580 can be Input Signals synchronized to an external clock. The switching frequency n Wide Input Voltage Range: 2.55V to 40V of the part may be free running or synchronized, and can n Low V Switch: 400mV at 0.75A (Typical) CESAT be set between 200kHz and 1.5MHz. n Integrated Soft-Start Function n The LT8580 also features innovative SHDN pin circuitry Easily Configurable as a Boost, SEPIC, or Inverting that allows for slowly varying input signals and an adjust- Converter n able undervoltage lockout function. User Configurable Undervoltage Lockout (UVLO) n Pin Compatible with LT3580 Additional features such as frequency foldback and n Tiny Thermally Enhanced 8-Lead 3mm 3mm DFN soft-start are integrated. The LT8580 is available in tiny and 8-Lead MSOP Packages thermally enhanced 3mm 3mm 8-lead DFN and 8-lead n AEC-Q100 Qualified for Automotive Applications MSOP packages. All registered trademarks and trademarks are the property of their respective owners. APPLICATIONS n VFD Bias Supplies n TFT-LCD Bias Supplies n GPS Receivers n DSL Modems n Local Power Supply TYPICAL APPLICATION 1.5MHz, 5V to 12V Boost Converter Efficiency and Power Loss 100 480 15H V OUT V IN 12V 5V 90 420 200mA 10k 80 360 V SW IN 70 300 130k SHDN FBX 4.7F 60 240 LT8580 2.2F 50 180 SYNC VC 6.04k 40 120 RT GND SS 47pF EFFICIENCY 30 60 3.3nF 56.2k 0.22F POWER LOSS 8580 TA01a 20 0 0 50 200 100 150 8580 TA01b LOAD CURRENT (mA) Rev. C 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8580 ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage .................................................0.3V to 40V SHDN Voltage ............................................0.3V to 40V IN SW Voltage ................................................0.4V to 65V SYNC Voltage ............................................ 0.3V to 5.5V RT Voltage ...................................................0.3V to 5V Operating Junction Temperature Range SS Voltage ................................................ 0.3V to 2.5V LT8580E (Notes 2, 5) .........................40C to 125C FBX Voltage .................................................................5V LT8580I (Notes 2, 5) ..........................40C to 125C FBX Current ............................................................1mA LT8580H (Notes 2, 5) ........................ 40C to 150C VC Voltage ................................................... 0.3V to 2V Storage Temperature Range ..................65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW FBX 1 8 SYNC FBX 1 8 SYNC VC 2 7 SS 9 VC 2 7 SS 9 GND V 3 6 RT GND V RT IN 3 6 IN 4 5 SW SHDN SW 4 5 SHDN MS8E PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE = 35C/W TO 40C/W JA 8-LEAD (3mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB = 43C/W 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 LT8580EDD PBF LT8580EDD TRPBF LGKH 8-Lead (3mm 3mm) Plastic DFN 40C to 125C LT8580IDD PBF LT8580IDD TRPBF LGKH 8-Lead (3mm 3mm) Plastic DFN 40C to 125C LT8580HDD PBF LT8580HDD TRPBF LGKH 8-Lead (3mm 3mm) Plastic DFN 40C to 150C LT8580EMS8E PBF LT8580EMS8E TRPBF LTGKJ 8-Lead Plastic MSOP 40C to 125C LT8580IMS8E PBF LT8580IMS8E TRPBF LTGKJ 8-Lead Plastic MSOP 40C to 125C LT8580HMS8E PBF LT8580HMS8E TRPBF LTGKJ 8-Lead Plastic MSOP 40C to 150C AUTOMOTIVE PRODUCTS** LT8580EMS8E WPBF LT8580EMS8E WTRPBF LTGKJ 8-Lead Plastic MSOP 40C to 125C LT8580IMS8E WPBF LT8580IMS8E WTRPBF LTGKJ 8-Lead Plastic MSOP 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. C 2 For more information www.analog.com