August 23, 2012, Linear Technology Corporation (Linear Technology Corporation) introduced synchronous buck DC / DC controller LTC3883/-1, the device is equipped for digital power system management I2C-based PMBus interface. The LTC3883/-1 both best-current-mode switching regulator performance and precision mixed signal data acquisition function, can be extremely convenient power system design and management. LTpowerPlay ™ software development system through an easy-to-use graphical user interface (GUI) to support the device.
LTC3883 allows digital set and read back to the real-time control and monitoring of critical point-of-load converters function. Programmable control parameters including output voltage regulation and current limiting margin, the input and output monitor limit, the switching frequency and tracking. Built-in precision data converters and EEPROM allow capture of the regulator settings and telemetry variables, and its non-volatile memory, settings and variables, including input voltage and current, and output voltage and current, duty cycle , temperature and fault records.
MILPITAS, CA-based the GUI-LTpowerPlay development software LTC3883 configuration through the device's I2C serial interface, very easy to save to the internal EEPROM. With the configuration values stored in the chip, the controller can power independently, without increasing the burden on the host processor. The default setting of the output voltage, switching frequency, phase, device address can be selectively configured through an external resistor divider. The variety of designs can be very easily in the firmware calibration and configuration, which can be optimized for a range of applications of a single hardware design.
LTC3883 can be configured for up to 6, these phases can be interleaved and parallel, so as to meet the needs of current and / or output and minimize input and output filtering in order to achieve accurate and divide between the plurality of IC . Applications include telecommunications, data communications, computing and storage markets on current ASIC, FPGA and processor power.
LTC3883 integrated with high-current gate drive N-channel power MOSFETs to drive 4.5V to 24V input voltage range. The device can produce an accuracy of ± 0.50%, and the output voltage range of 0.5V to 5.5V, the entire operating temperature range, each phase output currents up to 30A. The integrated amplifier provides true remote differential output voltage sampling, which can achieve high accuracy adjustment, but without board IR drop. Current is detected by the voltage drop across the output inductor (DCR), you can achieve the highest efficiency, or the option of using an external sense resistor. Programmable DCR temperature compensation in a wide temperature range to maintain accurate and constant current limit. The device is only 90ns minimum on-time LTC3883/-1 ideal for compact high frequency / high step-down ratio applications. Accurate timing across multiple chips and event-based or time-based sorting allows optimization of complex, multi-track system power-up and power-down. Other features include the identification and tracking data storage cycle current limit, adjustable soft-start, simultaneous switching frequency, programmable GPIO pin to indicate device status and provides fault self-recovery.
LTC3883 have a built-in LDO, LTC3883-1 allows the use of an external bias voltage to achieve maximum efficiency for the controller and gate drive power. Both devices are available in a thermally enhanced 5mm x 5mm QFN-32 package. Extended temperature range of-class version of the specifications in -40 ° C to 105 ° C operating junction temperature range. Industrial-grade version of the specification of -40 ° C to 125 ° C operating junction temperature range. 1000 approved the purchase price of $ 4.82 per tablet, two versions are available from stock
Microprocessor
