LT1618 LINER [Linear Technology], LT1618 Datasheet
LT1618
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LT1618 Summary of contents
Page 1
... The current sense voltage is set at 50mV and can be adjusted using the I pin. ADJ Available in the 10-Pin MSOP package, the LT1618 pro- vides a complete solution for constant-current applica- tions. , LTC and LT are registered trademarks of Linear Technology Corporation. L1 ...
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... 0V IADJ V = 1.85V 1.80V ISP ISN IADJ ORDER PART NUMBER LT1618EMS 9 SHDN N/C MS10 PART MARKING = 160 C/W JA LTNH MIN TYP MAX UNITS 1.6 18 1.8 2.7 0.1 1 1.250 1.263 1.276 1.243 1.263 1.283 ...
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... Shutdown Threshold (SHDN Pin) Start-Up Threshold (SHDN Pin) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1618 is guaranteed to meet performance specifications from Specifications over the – operating W U TYPICAL PERFOR A CE CHARACTERISTICS ...
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... Input Supply Pin. Bypass this pin with a IN capacitor to ground as close to the device as possible. SHDN (Pin 9): Shutdown Pin. Tie this pin higher than 1V to turn on the LT1618; tie below 0.3V to turn it off. V (Pin 10): Compensation Pin for Error Amplifier. Con- C nect a series RC from this pin to ground. Typical values are 2k and 10nF ...
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... Figure 1. LT1618 Block Diagram input is higher takes precedence, forcing the converter into either a constant-current or a constant-voltage mode. The LT1618 is designed to transition cleanly between the two modes of operation. Current sense amplifier A1 senses the voltage between the ISP and ISN pins and provides a 25 level-shifted version to error amplifier A2 ...
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... Schottky diodes with higher voltage and current ratings. Table 3. Recommended Schottky Diodes 1A PART UPS120 UPS130 UPS140 MBRM120 MBR0520 MBRM130 MBR0530 MBRM140 MBR0540 B120 B130 B140 pin of the LT1618 4.7 F input IN PHONE URL (408) 573-4150 www.t-yuden.com (814) 237-1431 www.murata.com (408) 986-0424 www.kemet.com 0.5A PART VENDOR PHONE/URL ...
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... Considerations When Sensing Input Current In addition to regulating the DC output current for current- source applications, the constant-current loop of the LT1618 can also be used to provide an accurate input current limit. Boost converters cannot provide output short-circuit protection, but the surge turn-on current can pin, the current ADJ be drastically reduced using the LT1618’ ...
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... C approximately C /10) in parallel with the R C compensation network. Frequency Compensation The LT1618 has an external compensation pin (V allows the loop response to be optimized for each applica- tion. An external resistor and capacitor (or sometimes just a capacitor) are placed at the V pin to provide a pole and C a zero (or just a pole) to ensure proper loop compensation. ...
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... C 33nF (408) 573-4150 (408) 573-4150 (408) 573-4150 (800) 282-9855 (847) 956-0666 (847) 956-0666 Efficiency 100 150 200 250 LOAD CURRENT (mA) 1618 TA02b LT1618 L3 2 10k MURS110 Q1 FMMT717 ZETEX 13.5V/18. 3.3 F 3.3 F 22kHz Q1 NETWORK MMBT3904 TUNING R4 1k 1618 TA02a ...
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... F 160k C C 0.1 F (408) 573-4150 (408) 573-4150 (800) 282-9855 (847) 956-0666 1618 • TA03a L1 D1 20mA ISP 2 ISN R1 LT1618 100k C C 0.1 F (408) 573-4150 (408) 573-4150 (800) 282-9855 (847) 956-0666 1618 • TA04a 80mA D1 0.619 ...
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... Boost Converter Start-Up without Input Current Limit 5V/DIV 200mA/DIV 1618 TA07 U MS10 Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.034 0.043 (0.86) (1.10) REF MAX PLANE 0.007 – 0.011 0.005 0.002 (0.17 – 0.27) (0.13 0.05) 0.0197 (0.50) BSC LT1618 Efficiency 3. 100 120 140 ...
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... LT1618 U TYPICAL APPLICATIONS USB to 5V SEPIC Converter 0 ISN C1 3 4.7 F ISP LT1618 3.3V 9 SHDN OFF GND ADJ 20k 4 5 3.3V 100mA 500mA 13k 0V C1: TAIYO YUDEN JMK212BJ475 C2: TAIYO YUDEN JMK316BJ106 C3: TAIYO YUDEN EMK212BJ474 D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-100 ...