LT3495EDDB#TRMPBF Analog Devices

POWER LOSS (mW) LT3495/LT3495B/ LT3495-1/LT3495B-1 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect FEATURES DESCRIPTION n Low Quiescent Current The LT 3495/LT3495B/LT3495-1/LT3495B-1 are low noise 60A in Active Mode boost converters with integrated power switch, feedback 0.1A in Shutdown Mode resistor and output disconnect circuitry. The parts control n Low Noise Control Scheme (Switching Frequency power delivery by varying both the peak inductor current Always Stays Above Audible Range for LT3495/-1) and switch off-time. This novel* control scheme results n Integrated Power NPN: in low output voltage ripple as well as high efficiency 650mA Current Limit (LT3495/B) over a wide load range. For the LT3495/LT3495-1, the 350mA Current Limit (LT3495-1/B-1) off-time of the switch is not allowed to exceed a fixed n Integrated Output Disconnect level, guaranteeing the switching frequency stays above n Integrated Output Dimming the audio band for the entire load range. The parts feature n Wide input range: 2.5V to 16V a high performance NPN power switch with a 650mA n Wide output range: Up to 40V and 350mA current limit for the LT3495/LT3495B and n Integrated feedback resistor LT3495-1/LT3495B-1 respectively. The quiescent current n Tiny 10-Lead 3mm 2mm DFN Package is a low 60A, which is further reduced to less than 0.1A in shutdown. The internal disconnect circuitry allows the output voltage to be isolated from the input during shut- APPLICATIONS down. An auxiliary reference input (CTRL pin) overrides n OLED Power the internal 1.235V feedback reference with any lower n Low Noise Power value allowing full control of the output voltage during n MP3 Player operation. The LT3495 series are available in a tiny 10-lead 3mm 2mm DFN package. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Patent pending. TYPICAL APPLICATION Output Voltage Ripple vs Load Current OLED Power Supply from One Li-Ion Cell Efficiency vs Load Current 50 90 400 10H V = 3.6V ONE IN LOAD FROM CAP Li-Ion 1.0F 0603 CELL 4.7F 2.2F CAPACITOR AT V OUT 40 80 320 LOAD FROM V OUT SW CAP V OUT 16V V V CC OUT 30 70 240 70mA LT3495 909k 1F SHDN FB 20 60 160 CTRL GND 3495 TA01a 10 50 80 2.2F 1206 CAPACITOR AT V OUT 0 40 0 0.1 1 10 100 0.1 1 10 100 LOAD CURRENT (mA) LOAD CURRENT (mA) 3495 TA01b 3495 TA01c 3495b1b1fa 1 V PEAK-TO-PEAK RIPPLE (mV) OUT EFFICIENCY (%)LT3495/LT3495B/ LT3495-1/LT3495B-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V Voltage ...............................................................16V CC GND 1 10 SW SW Voltage ...............................................................40V GND 2 9 CAP CAP Voltage ..............................................................40V 11 V 3 8 CAP CC V Voltage .............................................................40V OUT CTRL 4 7 V OUT SHDN Voltage ...........................................................10V SHDN 5 6 FB CTRL Voltage ............................................................10V DDB PACKAGE FB Voltage ................................................................2.5V 10-LEAD (3mm 2mm) PLASTIC DFN T = 125C, = 76C/W JMAX JA Maximum Junction Temperature........................... 125C EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB Operating Temperature Range (Note 2).. 40C to 125C Storage Temperature Range ................... 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3495EDDB PBF LT3495EDDB TRPBF LDSS 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT3495EDDB-1 PBF LT3495EDDB-1 TRPBF LDSV 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT3495BEDDB PBF LT3495BEDDB TRPBF LDST 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT3495BEDDB-1 PBF LT3495BEDDB-1 TRPBF LDSW 10-Lead (3mm 2mm) Plastic DFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: