The LTC3676 and LTC3676-1 are complete PMIC power management solutions for portable processors including Freescale's i.MX6 series, PXA, OMAP, ARM Cortex and other advanced portable microprocessor-based systems. These devices contain four synchronous step-down DC/DC converters for core, memory, I/O and system on-chip (SoC) rails plus three 300mA low dropout (LDO) regulators for low noise analog supplies with dynamic control & sequencing. The LTC3676-1 configures a 1.5A buck regulator for source/sink and tracking operation to support DDR memory termination and also adds a VTTR reference output for DDR. These two pin features replace the LDO4 enable and feedback pins of the LTC3676. Supporting the multiple regulators is a highly configurable power sequencing capability, dynamic voltage scaling output voltage control, a pushbutton interface controller, plus regulator control via an I²C interface with extensive status reporting and an interrupt output.The LTC3676's four constant frequency current-mode buck switching regulators are internally compensated and provide up to 2.5A, 2.5A, 1.5A and 1.5A output currents, and have complete I²C-control, including selectable switching frequencies (2.25MHz or 1.125MHz) and phasing. The device's power-on default frequency is 2.25MHz with switch edge rate adjustment for reduced EMI. The LTC3676 also has four LDOs for low noise analog supplies, including three 300mA rails with different combinations of fixed and I2C-selectable voltage options; two of these regulators feature adjustable outputs the other is an always-on 25mA supply with a resistor-programmable output voltage.The LTC3676/-1 is available in a low profile (0.75mm) 40-pin 6mm × 6mm QFN package. 1000-piece pricing starts at $5.50 each. In addition to E-grade and I-grade there is the H-grade version which can operate from -40°C to +150°C.
