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LT3587 Dataheets PDF



Part Number LT3587
Manufacturers Linear Technology
Logo Linear Technology
Description High Voltage Monolithic Inverter and Dual Boost
Datasheet LT3587 DatasheetLT3587 Datasheet (PDF)

www.DataSheet4U.com LT3587 High Voltage Monolithic Inverter and Dual Boost DESCRIPTION The LT®3587 provides a one chip solution for applications requiring two positive and one negative high voltage supplies. The LT3587 input voltage range of 2.5V to 6V makes it ideal for various battery-powered systems. A single resistor programs each of the three output voltage levels and the output current of Boost3. The intelligent softstart allows for sequential soft-start of the Boost1 output followed by t.

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www.DataSheet4U.com LT3587 High Voltage Monolithic Inverter and Dual Boost DESCRIPTION The LT®3587 provides a one chip solution for applications requiring two positive and one negative high voltage supplies. The LT3587 input voltage range of 2.5V to 6V makes it ideal for various battery-powered systems. A single resistor programs each of the three output voltage levels and the output current of Boost3. The intelligent softstart allows for sequential soft-start of the Boost1 output followed by the negative output with a single capacitor. Internal sequencing circuitry also disables the inverter until the Boost1 output has reached 87% of its final value. The LT3587 integrates all the power switches, soft-start, and output-disconnect circuits into a small 3mm × 3mm QFN package. This high level of integration combined with small external components makes the LT3587 ideal for space constrained applications. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES n n n n n n n n n Ideal for CCD, LCD, LED Backlight and OLED Applications Easy Generation of 15V (50mA), –8V (100mA) and 20V (20mA) from a Li-Ion Cell VVIN Range: 2.5V to 6V Wide Output Ranges: Up to 32V for the Boosts and Up to –32V for the Inverter Output Disconnect for the Boost Channels Boost3 Allows Voltage Programming and/or Current Programming for a ‘One Wire Current Source’ Overload Fault Protection with Fault I/O Pin Indicator Combined Soft-Start and Enable Pins Small 20-Pin 3mm × 3mm QFN Package APPLICATIONS n n n n n n Digital Still and Video Cameras Scanner and Display Systems PDA, Cellular Phones and Handheld Computers LED Backlight and OLED Display Drivers CCD Imager Bias General High Voltage Supply Bias TYPICAL APPLICATION Li-Ion Powered Supply for CCD Imager and Six White Backlight LEDs VVIN 2.5V TO 6V 1μF 2.2μF SW3 CAP3 IFB3 8.06k GND LT3587 EN/SS1 EN/SS3 FLT SW2 2.2μF VVIN 2.5V TO 6V 15μH 15μH 22μF CCD NEGATIVE –8V, 100mA 3587 TA01a 10μH 15μH 90 VIN SW1 CAP1 VOUT1 FB1 10μF CCD POSITIVE 15V, 50mA EFFICIENCY (%) 1M 2.7pF LED DRIVER 20mA, UP TO 6 LEDS 1M 6.8pF Efficiency Curve CDD+ = 50mA – 85 CDD = 100mA LED = 20mA 80 75 70 65 60 55 50 0 0.5 1 NORMALIZED CURRENT ALL CHANNELS ENABLED CDD– LED POWER DISSIPATION ALL CHANNELS ENABLED CDD+ 800 700 POWER DISSIPATION (mW) 600 500 400 300 200 100 0 1.5 3587 TA01b VOUT3 VFB3 FB2 3587fc 1 www.DataSheet4U.com LT3587 (Note 1) ABSOLUTE MAXIMUM RATINGS VIN ..............................................................................6V Soft-Start Input Pins EN/SS1, EN/SS3 .....................................................6V Feedback Pins FB1, FB2, IFB3, VFB3 ................................. –0.2V to 6V High Voltage Switch Pins SW1, SW2, SW3...................................................40V High Voltage Output Pins CAP1, CAP3, VOUT1, VOUT3 ...................................32V Bidirectional I/O Pin FLT ..........................................................................6V FLT Current ........................................................10mA Operating Junction Temperature Range .. –40°C to 125°C Storage Temperature Range................... –65°C to 125°C PIN CONFIGURATION TOP VIEW EN/SS3 EN/SS1 15 FB1 14 VOUT1 21 13 CAP1 12 GND 11 SW1 6 FB2 7 GND 8 GND 9 10 SW2 NC VFB3 IFB3 VIN 20 19 18 17 16 VOUT3 1 CAP3 2 SW3 3 GND 4 FLT 5 UD PACKAGE 20-LEAD (3mm s 3mm) PLASTIC QFN θJA = 68°C/W, θJC = 4.2°C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LT3587EUD#PBF TAPE AND REEL LT3587EUD#TRPBF PART MARKING LDNC PACKAGE DESCRIPTION 20-Lead (3mm × 3mm) Plastic QFN TEMPERATURE RANGE –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VVIN = 3.6V, VEN/SS1 = VEN/SS3 = VVIN unless otherwise noted (Note 2, 3). PARAMETER Operating Input Voltage Range Quiescent Current VEN/SS1 = 0V, VEN/SS3 = VVIN OR VEN/SS1 = VVIN, VEN/SS3 = 0V OR VEN/SS1 = VEN/SS3 = VVIN Not Switching VEN/SS1 = VEN/SS3 = 0V, In Shutdown Switching Frequency Maximum Duty Cycle Minimum On Time Power Fault Delay from Any Output to FLT FLT Input Threshold Low FLT Leakage Current FLT Voltage Output Low VFLT = 5V IFLT = 1mA l l l l l ELECTRICAL CHARACTERISTICS CONDITIONS MIN 2.5 TYP 2.4 MAX 6 4 UNITS V mA 5.5 0.8 87 1 93 50 16 0.4 1.0 9 1.2 70 1.6 ±1 0.4 μA MHz % ns ms V μA V 3587fc 2 www.DataSheet4U.com LT3587 ELECTRICAL CHARACTERISTICS PARAMETER Boost1 CAP1 Bias Current FB1 Reference Voltage VOUT1 Output Voltage SW1 Current Limit SW1 VCESAT SW1 Leakag.


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