Power Supplies Chip has four buck regulators to control ARM Cortex and i.MX6
2013/07/30
The LTC3676 and LTC3676-1 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 and 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.
The chip offers a 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. Each buck has a dynamically controlled DAC-based output reference and an external feedback pin to set the nominal output voltage range.
Three operating modes can be set using the I²C interface: pulse-skipping (supports 100% duty cycle), Burst Mode operation or forced continuous.
The LTC3676 also has four LDOs for low noise analogue supplies, including three 300mA rails with different combinations of fixed and I2C-selectable voltage options; two of these regulators feature adjustable outputs.
The other LDO is an always-on 25mA supply with a resistor-programmable output voltage.
The LTC3676/-1 is available from stock in a thermally enhanced, low profile (0.75mm) 40-pin 6mm × 6mm exposed pad QFN package. 1000-piece pricing starts at $5.50 each for the E grade.
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