The LT®3587 provides a one-chip solution for applicationsrequiring two positive and one negative high voltage supplies.The LT3587 input voltage range of 2.5V to 6V makesit ideal for various battery-powered systems.A single resistor programs each of the three output voltagelevels and the output current of Boost3. The intelligent softstartallows for sequential soft-start of the Boost1 outputfollowed by the negative output with a single capacitor.Internal sequencing circuitry also disables the inverter untilthe Boost1 output has reached 87% of its fi nal value.The LT3587 integrates all the power switches, soft-start,and output-disconnect circuits into a small 3mm × 3mmQFN package. This high level of integration combinedwith small external components makes the LT3587 idealfor space constrained applications.
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