LT3489 2MHz Boost DC/DC Converter with 2.5A Switch and Soft-Start FEATURES DESCRIPTIO 2.5A, 0.12, 40V Internal Switch The LT 3489 is a xed frequency step-up DC/DC converter 2MHz Switching Frequency containing an internal 2.5A, 40V switch. The LT3489 is Integrated Soft-Start Function ideal for large TFT-LCD panel power supplies. The LT3489 V Range: 2.6V to 16V switches at 2MHz, allowing the use of tiny, low pro le IN Adjustable Output from V to 40V inductors and low value ceramic capacitors. Loop com- IN Low V Switch: 110mV at 1A (Typical) pensation can be either internal or external, giving the CESAT 8V at 610mA from a 3.3V Input user exibility in setting loop compensation and allow- Internal or External Loop Compensation ing optimized transient response with low ESR ceramic Small 8-Lead MS8E output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate U during start-up. APPLICATIO S The 8-lead MS8E package and high switching frequency en- TFT-LCD Bias Supplies sure a low pro le overall solution less than 1.1mm high. GPS Receivers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DSL Modems Local Power Supply TYPICAL APPLICATIO Low Pro le, Triple Output TFT Supply (8V, 8V, 23V) Ef ciency 90 V ON 23V 85 10mA 80 0.1F 0.1F 0.1F 75 70 2.2H AV DD V IN 8V 65 3.3V 610mA 60 V SW IN 28.7k OFF ON SHDN 55 V LOAD = 10mA ON SS LT3489 + V LOAD = 20mA OFF FB 4.7F 20F 2F 50 COMP 100 200 400 0 300 500 600 700 V GND C A LOAD CURRENT (mA) VDD 5.23k 100nF 3489 TA01b 37.4k 220pF 0.1F 2F V OFF 8V 3489 TA01 20mA 3489f 1 EFFICIENCY (%) U ULT3489 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V Voltage ................................................................16V IN V 1 8 SS C SW Voltage ................................................ 0.4V to 40V FB 2 7 COMP SHDN 3 6 V IN FB, V , COMP, SS Voltages .........................................6V C 5 SW GND 4 SHDN Voltage ...........................................................16V MS8E PACKAGE 8-LEAD PLASTIC MSOP Current Into FB Pin ................................................1mA T = 125C, = 40C/W, = 10C/W JMAX JA JC Maximum Junction Temperature .......................... 125C EXPOSED PAD (PIN 9) IS GND (MUST BE SOLDERED TO PCB) Operating Temperature Range (Note 2) ... 40C to 85C ORDER PART NUMBER MS8E PART MARKING Storage Temperature Range ................... 65C to 150C LT3489EMS8E LTBYF Lead Temperature (Soldering, 10 sec) .................. 300C Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: