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LT3587 Datasheet(PDF) 1 Page - Linear Technology |
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LT3587 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3587 1 3587fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Voltage Monolithic Inverter and Dual Boost The LT®3587 provides a one chip solution for applications requiring two positive and one negative high voltage sup- plies. 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 soft- start 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. Li-Ion Powered Supply for CCD Imager and Six White Backlight LEDs n Ideal for CCD, LCD, LED Backlight and OLED Applications n Easy Generation of 15V (50mA), –8V (100mA) and 20V (20mA) from a Li-Ion Cell n VVIN Range: 2.5V to 6V n Wide Output Ranges: Up to 32V for the Boosts and Up to –32V for the Inverter n Output Disconnect for the Boost Channels n Boost3 Allows Voltage Programming and/or Current Programming for a ‘One Wire Current Source’ n Overload Fault Protection with Fault I/O Pin Indicator n Combined Soft-Start and Enable Pins n Small 20-Pin 3mm × 3mm QFN Package n Digital Still and Video Cameras n Scanner and Display Systems n PDA, Cellular Phones and Handheld Computers n LED Backlight and OLED Display Drivers n CCD Imager Bias n General High Voltage Supply Bias Efficiency Curve 15μH 10μH 3587 TA01a VOUT3 CAP3 VFB3 IFB3 SW2 FB2 GND CAP1 FB1 VOUT1 LT3587 FLT EN/SS1 EN/SS3 SW3 SW1 VIN 10μF VVIN 2.5V TO 6V 2.2μF 15μH15μH CCD POSITIVE 15V, 50mA CCD NEGATIVE –8V, 100mA 8.06k 1μF LED DRIVER 20mA, UP TO 6 LEDS 2.2μF 1M 1M 22μF VVIN 2.5V TO 6V 2.7pF 6.8pF NORMALIZED CURRENT 0 90 85 75 65 55 80 70 60 50 800 700 500 300 100 600 400 200 0 1 3587 TA01b 1.5 0.5 CDD+ = 50mA CDD– = 100mA LED = 20mA CDD+ CDD– LED ALL CHANNELS ENABLED POWER DISSIPATION ALL CHANNELS ENABLED |
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