LT1615 Linear Technology, LT1615 Datasheet
LT1615
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LT1615 Summary of contents
Page 1
... The 36V switch allows high voltage outputs up to 34V to be easily generated in a simple boost topology without the use of costly transformers. The LT1615’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-con- scious portable applications ...
Page 2
... Switch Off, V Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1615 and LT1615-1 are guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 3
... TEMPERATURE ( C) SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher to enable the device. Tie below 0.25V to turn off the device. V (Pin 5): Input Supply Pin. Bypass this pin with a IN capacitor as close to the device as possible. LT1615/LT1615-1 Quiescent Current 1.23V FB NOT SWITCHING ...
Page 4
... L1 to deliver current to the output. This switching action continues until the output voltage is charged up (until the FB pin reaches 1.23V), then A1 turns off the internal circuitry and the cycle repeats. The LT1615 contains additional circuitry to provide protection during start-up and under short-circuit conditions. When the FB pin voltage is less than approximately 600mV, the switch off-time is increased to 1 ...
Page 5
... Inductor Selection—Boost Regulator The formula below calculates the appropriate inductor value to be used for a boost regulator using the LT1615 or LT1615-1 (or at least provides a good starting point). This value provides a good tradeoff in inductor size and system performance. Pick a standard inductor close to this value. ...
Page 6
... To reduce the output ripple, increase the output capacitor value or add a 4.7pF feed-forward capaci- tor in the feedback network of the LT1615 (see the circuits in the Typical Applications section). Adding this small, inexpensive 4.7pF capacitor will greatly reduce the output voltage ripple ...
Page 7
... LOAD CURRENT (mA) 1615/-1 TA03a 4-Cell to 5V SEPIC Converter 4.7pF LT1615 4 3 SHDN FB GND C1 324k 4 (408) 573-4150 (408) 573-4150 (408) 573-4150 (814) 237-1431 (800) 441-2447 1-Cell to 3.3V Boost Converter 4.7pF ...
Page 8
... Dual Output Converter with Load Disconnect LT1615 4 3 SHDN FB GND C1 4 C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2, C3, C4: TAIYO YUDEN TMK316BJ105 (408) 573-4150 C5: TAIYO YUDEN LMK212BJ105 (408) 573-4150 L1: MURATA LQH3C100K24 (814) 237-1431 ...