Linear Technology Corporation announces the LT3487, a dual channel (boost/inverter), 2MHz DC/DC converter with output disconnect. Its internal 750mA/900mA 30V switches can deliver up to 45mA at 15V and 90mA at -8V from a single Li-Ion cell, providing bias for the latest generation of CCD (Charge-Coupled Device) imagers. Its input voltage range of 2.3V to 16V enables inputs that range from Li-Ion to multiple cell alkaline/NiMH batteries. Switching at a constant 2MHz, the LT3487 uses tiny low profile capacitors and inductors, generating low noise outputs that are easy to filter. Schottky diodes are integrated into the IC while output voltages can be set with only one resistor per channel, reducing external component count. Packaged in a 3mm x 3mm DFN, the entire solution has less than a 1mm profile and occupies just 50mm2.
The LT3487 offers internal sequencing circuitry that disables the negative channel until the positive channel has reached 87% of its final value. This ensures that the sum of the two outputs is always positive. Intelligent soft-start allows sequential soft-start of the two channels with a single capacitor.
The LT3487EDD is available from stock and pricing starts at $2.30 each for 1,000-piece quantities.
Summary of Features: LT3487
Generates 15V at 45mA, -8V at 90mA from a Li-Ion Cell
Output Disconnect
Sequencing: Positive Output Reaches Regulation before Negative Channel Begins Switching
Internal Schottky Diodes
2MHz Constant Switching Frequency
Requires Only One Resistor per Channel to Set Output Voltages
VIN Range: 2.3V to 16V
Output Voltage up to 28V
Short-Circuit Robust
Capacitor Programmable Soft-Start
Separate VBAT Pin Allows Separate Sources for Power & Control Circuitry
Available in 10-Lead (3mm x 3mm) DFN Package