TAS2553_15 datasheet(47/58 Pages) TI

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TAS2553

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SLAS978B – SEPTEMBER 2013 – REVISED FEBRUARY 2014

9 Power Supply Recommendations

9.1 Power Supplies

The TAS2553 requires three power supplies:

•

Boost Input (terminal: VBAT)

–

Voltage: 3.0 V to 5.5 V

–

Max Current: 2.6 A

•

Analog Supply (terminal: AVDD)

–

Voltage: 1.65 V to 1.95 V

–

Max Current: 30 mA

•

Digital I/O Supply (terminal: IOVDD)

–

Voltage: 1.5 V to 3.6 V

–

Max Current: 5 mA

The decoupling capacitors for the power supplies should be placed close to the device terminals. For VBAT,

IOVDD and AVDD, a small decoupling capacitor of 0.1 µF should be placed close to the device terminals. Refer

to Figure 56 for the schematic.

9.2 Power Supply Sequencing

The power supplies should be started in the following order:

1. VBAT,

2. IOVDD,

3. AVDD.

When the supplies have settled, the EN terminal can be set HIGH to operate the device. The above sequence

should be completed before any I2C operation.

9.3 Boost Supply Details

The boost supply (VBAT) and associated passives need to be able to support the current requirements of the

device. The peak current limit of the boost is 2.5 A. A minimum of a 10 µF capacitor is recommended on the

boost supply to quickly support changes in required current. Refer to Figure 56 for the schematic.

The current requirements can also be reduced by lowering the gain of the amplifier, or in response to decreasing

battery through the use of the battery-tracking AGC feature of the TAS2553 described in Battery Tracking AGC.

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