LT3467/LT3467A 1.1A Step-Up DC/DC Converter with Integrated Soft-Start FEATURES DESCRIPTION n 1.3MHz Switching Frequency (LT3467) The LT 3467/LT3467A switching regulators combine a n 2.1MHz Switching Frequency (LT3467A) 42V, 1.1A switch with a soft-start function. Pin compatible n Low V Switch: 330mV at 1.1A with the LT1930, its low V bipolar switch enables the CESAT CESAT n High Output Voltage: Up to 40V device to deliver high current outputs in a small footprint. n Wide Input Range: 2.4V to 16V The LT3467 switches at 1.3MHz, allowing the use of tiny, n Dedicated Soft-Start Pin low cost and low height inductors and capacitors. The n 5V at 540mA from 3.3V Input (LT3467) LT3467A switches at 2.1MHz, allowing the use of even n 5V at 430mA from 3.3V Input (LT3467A) smaller components. High inrush current at start-up is n 12V at 270mA from 5V Input (LT3467) eliminated using the programmable soft-start function. n 12V at 260mA from 5V Input (LT3467A) A single external capacitor sets the current ramp rate. A n Uses Small Surface Mount Components constant frequency current mode PWM architecture results n Low Shutdown Current: <1A in low, predictable output noise that is easy to lter. n Pin-for-Pin Compatible with the LT1930 and LT1613 The high voltage switch on the LT3467/LT3467A is rated n Low Pro le (1mm) ThinSOT Package at 42V, making the devices ideal for boost converters up n Low Pro le (0.75mm) 8-Lead (3mm 2mm) to 40V as well as SEPIC and yback designs. The LT3467 DFN Package can generate 5V at up to 540mA from a 3.3V supply or 5V at 450mA from four alkaline cells in a SEPIC design. APPLICATIONS The LT3467A can generate 5V at up to 430mA from a 3.3V n Digital Cameras supply or 15V at 135mA from a 3.3V supply. The LT3467/ n White LED Power Supplies LT3467A are available in a low pro le (1mm) 6-lead SOT-23 n Cellular Phones package and tiny 3mm 2mm DFN package. n Medical Diagnostic Equipment L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other n Local 5V or 12V Supplies trademarks are the property of their respective owners. n TFT-LCD Bias Supplies n xDSL Power Supplies TYPICAL APPLICATION Ef ciency 95 Single Li-Ion Cell to 5V Boost Converter 90 V = 4.2V 2.7H IN V 85 IN V OUT 2.6V TO V = 3.3V IN 5V 80 4.2V V = 2.6V 765mA AT V = 4.2V, IN IN 4.7F 402k 540mA AT V = 3.3V, IN V SW IN 75 360mA AT V = 2.6V IN SHDN OFF ON 3.3pF 70 LT3467 SS FB 65 GND 15F 60 0.047F 133k 55 3467 TA01a 50 100 300 400 500 700 800 900 200 600 I (mA) OUT 3467 TA01b 3467afe 1 EFFICIENCY (%)LT3467/LT3467A ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................................16V Operating Junction Temperature Range (Note 2) IN SW Voltage ................................................ 0.4V to 42V E Grade ................................................ 40C to 85C FB Voltage ................................................................2.5V I Grade ............................................... 40C to 125C Current Into FB Pin .............................................. 1mA Storage Temperature Range ................... 65C to 150C SHDN Voltage ......................................................... 16V Lead Temperature (Soldering, 10 sec) Maximum Junction Temperature ......................... 125C TSOT .................................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW FB 1 8 SHDN SW 1 6 V IN GND 2 7 SS 9 GND 2 5 SS SW 3 6 V IN FB 3 4SHDN SW GND 4 5 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 DDB PACKAGE 8-LEAD (3mm s 2mm) PLASTIC DFN T = 125C, = 165C/W, = 102C/W JMAX JA JC T = 125C, = 80C/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 LT3467EDDB PBF LT3467EDDB TRPBF LCPX 40C to 85C 8-Lead (3mm 2mm) Plastic DFN LT3467IDDB PBF LT3467IDDB TRPBF LCPX 40C to 125C 8-Lead (3mm 2mm) Plastic DFN LT3467AEDDB PBF LT3467AEDDB TRPBF LCKD 40C to 85C 8-Lead (3mm 2mm) Plastic DFN LT3467AIDDB PBF LT3467AIDDB TRPBF LCKD 40C to 125C 8-Lead (3mm 2mm) Plastic DFN LT3467IS6 PBF LT3467IS6 TRPBF LTACH 6-Lead Plastic TSOT-23 40C to 125C LT3467ES6 PBF LT3467ES6 TRPBF LTACH 6-Lead Plastic TSOT-23 40C to 85C LT3467AES6 PBF LT3467AES6 TRPBF LTBCC 6-Lead Plastic TSOT-23 40C to 85C LT3467AIS6 PBF LT3467AIS6 TRPBF LTBCC 6-Lead Plastic TSOT-23 40C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3467EDDB LT3467EDDB TR LCPX 40C to 85C 8-Lead (3mm 2mm) Plastic DFN LT3467IDDB LT3467IDDB TR LCPX 40C to 125C 8-Lead (3mm 2mm) Plastic DFN LT3467AEDDB LT3467AEDDB TR LCKD 40C to 85C 8-Lead (3mm 2mm) Plastic DFN LT3467AIDDB LT3467AIDDB TR LCKD 40C to 125C 8-Lead (3mm 2mm) Plastic DFN LT3467IS6 LT3467IS6 TR LTACH 6-Lead Plastic TSOT-23 40C to 125C LT3467ES6 LT3467ES6 TR LTACH 6-Lead Plastic TSOT-23 40C to 85C LT3467AES67 LT3467AES6 TR LTBCC 6-Lead Plastic TSOT-23 40C to 85C LT3467AIS67 LT3467AIS67 TR LTBCC 6-Lead Plastic TSOT-23 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. 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