Boost and Single Inductor Inverting DC/DC Converters with Optional IC Programing and OTP

The LT3582/LT3582-5/LT3582-12 are dual DC/DC converters featuring positive and negative outputs and integrated feedback resistors. The LT3582, with its built-in One Time Programming (OTP), has configurable output settings via the I2C interface, including output voltage settings, power-up sequencing, power-down discharge, and output voltage ramp rates. LT3582 settings can be changed adaptively in the final product, or set during manufacturing and made permanent using the built in non-volatile OTP memory. The positive output voltage can be set between 3.2V and 12.775V in 25mV steps. The negative output voltage can be set between –1.2V and –13.95V in –50mV steps. The LT3582-5 and LT3582-12 are pre-configured at the factory for ±5V and ±12V outputs respectively, and as such, don’t require the use of the I2C interface.

The LT3582 series includes two monolithic converters, one Boost and one Inverting. The Boost converter has an integrated power switch and output disconnect switch. The Inverting converter uses a single inductor topology and includes an integrated power switch. Both Boost and Inverting converters use a novel** control scheme resulting in low output voltage ripple while allowing for high conversion efficiency over a wide load current range. The LT3582 series is available in a 16-pin 3mm × 3mm QFN.

Applications

* AMOLED Power

* CCD Power

* General Purpose DC/DC Conversion

* Output Voltages:

* 3.2V to 12.775V and –1.2V to –13.95V (LT3582)

* 5V and –5V (LT3582-5)

* 12V and –12V (LT3582-12)

* Digitally Re-Programmable (LT3582) via I2C for:

* Output Voltages

* Power Sequencing

*

Output Voltage Ramp Rates

* Power-Up Defaults Settable with Non-Volatile OTP (LT3582)

* I2C Compatible Interface (Standard Mode*)

* All Power Switches Integrated

* 350mA Current Limit (Boost)

* 600mA Current Limit (Inverting)

* All Feedback Resistors Integrated

* Input Voltage Range: 2.55V to 5.5V

* Low Quiescent Current

* 325μA in Active Mode

* 0.01μA in Shutdown Mode

* Integrated Output Disconnect

* Tiny 16-Pin 3mm × 3mm QFN Package