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LT1618EMS Datasheet(PDF) 1 Page - Linear Technology |
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LT1618EMS Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LT1618 1 sn1618 1618fas APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO The LT ®1618 step-up DC/DC converter combines a tradi- tional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. This fixed frequency, current mode switcher oper- ates from a wide input voltage range of 1.6V to 18V, and the high switching frequency of 1.4MHz permits the use of tiny, low profile inductors and capacitors. The current sense voltage is set at 50mV and can be adjusted using the IADJ pin. Available in the 10-Pin (3mm × 3mm) Exposed Pad DFN and 10-pin MSOP packages, the LT1618 provides a com- plete solution for constant-current applications. ■ LED Backlight Drivers ■ USB Powered Boost/SEPIC Converters ■ Input Current Limited Boost/SEPIC Converters ■ Battery Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Accurate Input/Output Current Control: ±5% Over Temperature ■ Accurate Output Voltage Control: ±1% ■ Wide VIN Range: 1.6V to 18V ■ 1.4MHz Switching Frequency ■ High Output Voltage: Up to 35V ■ Low VCESAT Switch: 200mV at 1A ■ Available in (3mm × 3mm × 0.8mm) 10-Pin DFN and 10-Pin MSOP Packages Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter Efficiency Curve USB to 12V Boost Converter (with Selectable 100mA/500mA Input Current Limit) LOAD CURRENT (mA) 1618 TA01b 90 85 80 75 70 65 60 0 40 80 100 20 60 120 140 160 OFF ON SHDN IADJ VC VIN VOUT 12V SW ISN ISP FB LT1618 R1 909k R2 107k VIN 5V C1 4.7µF 10nF C2 4.7µF 1618 TA01a D1 L1 10µH 3 2 1 9 8 7 GND 510 4 C1: TAIYO YUDEN JMK212BJ475 C2: TAIYO YUDEN EMK316BJ475 D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-100 0.1Ω 2k 13k 20k 0V 3.3V 100mA 500mA 0V 3.3V |
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