Multi-output power management ICs in infotainment systems: Page 4 of 8

October 30, 2013 //By Steve Knoth, Jeff Marvin, Linear Technology Corporation
Multi-output power management ICs in infotainment systems
With automotive infotainment systems being increasingly incorporating highly integrated and very powerful microprocessors and FPGAs, power management for these infotainment systems is growing more complex. A solution that helps to keep the designs simple is multi-output power management chips.
suppression, although the input voltage is typically a pre-regulated 5V or 3.3V rail off the system or battery voltage.

A High Power, Power Management Solution

The LTC3676/-1 are complete power management solutions for Freescale i.MX6 processors, ARM based processors and other advanced portable microprocessor systems. The LTC3676/-1 contain four synchronous step-down DC/DC converters at up to 2.5A each for core, memory, I/O and system on-chip (SoC) rails plus three 300mA linear regulators for low noise analog supplies. 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 pin and feedback pins of the LTC3676. LDO4 is still programmable by I2C. Supporting the multiple regulators is a highly configurable power sequencing capability, dynamic output voltage scaling, a pushbutton interface controller, plus regulator control via an I2C interface with extensive status and fault reporting via an interrupt output. The LTC3676 supports i.MX6, PXA and OMAP processors with eight independent rails at appropriate power levels with dynamic control and sequencing. Other features include interface signals such as the VSTB pin that toggles between programmed run and standby output voltages on up to four rails simultaneously. The device is available in a low profile 40-pin 6mm x 6mm x 0.75mm exposed pad QFN package.

Figure 1. LTC3676-1 Simplified Typical Application Diagram

The LTC3676 Power Management Solution for Application Processors can solve the automotive infotainment system design challenges outlined above. The LTC3676HUJ PMIC is available in a high temperature (H-Grade) option with a junction temperature rating from -40°C to +150°C, easily satisfying the high temperature automotive operating requirement. The IC includes a thermal warning flag and interrupt specifically for junction temperature monitoring and also includes a hard thermal shutdown for reliable protection of the hardware, should power dissipation be mismanaged, or in the event of a severe fault condition.

The LTC3676

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