LT1617 Linear Technology, LT1617 Datasheet
LT1617
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LT1617 Summary of contents
Page 1
... The 36V switch allows high voltage outputs up to – 34V to be easily generated without the use of costly transformers. The LT1617’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. ...
Page 2
... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1617 and LT1617-1 are guaranteed to meet specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 3
... 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. LT1617/LT1617-1 Quiescent Current 1.23V FB NOT SWITCHING ...
Page 4
... FOR LT1617-1 U OPERATIO The LT1617 uses a constant off-time control scheme to provide high efficiencies over a wide range of output current. Operation can be best understood by referring to the block diagram in Figure 1. Q1 and Q2 along with R3 and R4 form a bandgap reference used to regulate the output voltage. When the voltage at the NFB pin is slightly below – ...
Page 5
... APPLICATIO S I FOR ATIO Choosing an Inductor Several recommended inductors that work well with the LT1617 and LT1617-1 are listed in Table 1, although there are many other manufacturers and devices that can be used. Consult each manufacturer for more detailed infor- mation and for their entire selection of related parts. Many different sizes and shapes are available ...
Page 6
... Ceramic capacitors also make a good choice for the input decoupling capacitor, which should be placed as close as possible to the LT1617. A 4.7 F input capacitor is suffi- cient for most applications. Table 2 shows a list of several capacitor manufacturers. Consult the manufacturers for more detailed information and for their entire selection of related parts ...
Page 7
... GND C1 4 C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2: TAIYO YUDEN EMK316BJ475 (408) 573-4150 C3: TAIYO YUDEN TMK316BJ224 (408) 573-4150 L1, L2: MURATA LQH3C470K34 (814) 237-1431 D1: CENTRAL SEMICONDUCTOR CMDSH-3 (516) 435-1110 LT1617/LT1617-1 –5V 100mA 100pF 1617/-1 TA02 –33V 20mA 619k 24.9k 1617/-1 TA03 – ...
Page 8
... Dual Output Converter with Load Disconnect LT1617 4 3 SHDN NFB 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 ...