Tegra 200 Series Developer Board User Guide

4.1.1Major Components

4.1.1.1 PMU

The Tegra 200 Series Developer Board includes a multi-channel power management unit for embedded processors (TI TPS658621).

Feature List

ƒHost Interface

-I2C Control I/F

-Core/CPU power request signals

-32.768KHz Clock

-Reset input

-Reset output

ƒRTC LDO

-1.0V-1.2V nominal voltage range with 25mV steps

-Separate LDO for RTC domain allowing Deep Sleep mode support – the Tegra 250 lowest power mode

-Switch RTC domain automatically back to 1.2V when wake-up event detected (w/CORE_PWR_REQ)

ƒCORE switcher

-1.0V-1.2V nominal voltage range with 25mV steps

-CORE and RTC domains must track each other within 170mV

-Tracking can be ensured in software

-Optimized DVS handled by NVIDIA BSP (DVFS architecture)

-Turned off if CORE_PWR_REQ is de-asserted – on at 1.2V when CORE_PWR_REQ asserted

ƒCPU switcher

-0.85-1.0V nominal voltage range with 25mV steps

-Optimized DVS handled by NVIDIA BSP (DVFS architecture)

-Turned off if CPU_PWR_REQ is de-asserted – on at 1.0V when CPU_PWR_REQ asserted

ƒPLL LDO

-Use 1.1V LDO

-Very good line regulation ensured using DC/DC switcher as LDO source

ƒSTDBY input

-Standby mode: Only the minimum rails are kept powered (RTC and SYSTEM domains, DDR2 in self-refresh)

-The Tegra 250 indicates Standby mode by de-asserting CORE_PWR_REQ (polarity programmable)

4.1.1.2 Battery Charge Controller

The Tegra 200 Series Developer Board includes a battery charger with input current detect comparator and charge enable pin (TI bq24745). For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/bq24745.pdf.

4.1.1.3 Battery Pack (Not Included)

The Tegra 200 Series Developer Board can be used with a 3 cell (3S1P) Lithium ion battery pack that has a nominal voltage of

10.8volts and a total capacity of 2200mAh. The 3S1P is ideal for applications that can operate on lower voltages.

4.1.1.4 External Switchers, LDOs, Power Switches

The Tegra 200 Series Developer Board includes the following components:

ƒNotebook System Power Controller (TI TPS51220): a dual synchronous buck regulator controller with 2 LDOs. For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps51220.pdf.

ƒDDR2 Memory Power Supply (TI TPS51116): provides a power supply for the DDR2memory system. For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps51116.pdf.

ƒ350mA Low-Dropout Linear Regulator (TI TPS72012): for a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps72012.pdf.

ƒStep Down Converter (TI TPS62290): synchronous step down dc-dc converter optimized for battery powered portable devices. For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps62290.pdf.

ƒ135-mΩ Dual Power-Distribution Switch (TI TPS2052): for a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps2052.pdf.

ƒ135-mΩ Power Distribution Switch (TI TPS2051): for a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps2051.pdf.

DG-04927-001_v01

Advance Information – Subject to Change

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