LT1618 Datasheet | Linear Technology

LT1618 Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter Features s s s s s s s DESCRIPTIO 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: 200m V at 1A Tiny 10-Pin MSOP Package U APPLICATIO S s s s s The LT®1618 step-up DC/DC converter bines a traditional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. This fixed frequency, current mode switcher operates 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 50m V and can be adjusted using the IADJ pin. Available in the 10-Pin MSOP package, the LT1618 provides a plete solution for constant-current applications. , LTC and LT are registered trademarks of Linear Technology Corporation. LED Backlight Drivers USB Powered Boost/SEPIC Converters Input Current Limited Boost/SEPIC Converters Battery Chargers TYPICAL APPLICATIO USB to 12V Boost Converter (with Selectable 100m A/500m A Input Current Limit) VIN 5V 0.1Ω L1 10µH D1 VOUT 12V 7 SW LT1618 8 3.3V OFF ON 0V 20k 9 VIN SHDN IADJ GND 4 3.3V 100m A 500m A 0V 5 VC 10 2k 13k 10n F FB 90 85 2 C1 4.7µF 3 ISN ISP 1 R2 107k C2 4.7µF EFFICIENCY (%) R1 909k 80 75 70 65 60 C1: TAIYO YUDEN JMK212BJ475 C2: TAIYO YUDEN EMK316BJ475 D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-100 1618 TA01a Efficiency Curve 60 80 100 120 140 160 40 LOAD CURRENT (m A) 1618 TA01b ABSOLUTE (Note 1) AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO TOP VIEW FB ISN ISP IADJ GND 1 2 3 4 5 10 9 8 7 6 VC SHDN VIN SW N/C VIN, SHDN Voltage ................................................... 18V SW Voltage .............................................................. 36V ISP, ISN Voltage ........................