TC1301A datasheet(19/28 Pages) MICROCHIP

19 / 28 page

DS21798C-page 19

TC1301A/B

Junction Temperature Estimate

To estimate the internal junction temperature, the

calculated temperature rise is added to the ambient or

offset temperature. For this example, the worst-case

junction temperature is estimated below:

Maximum Package Power Dissipation at 50°C

Ambient Temperature

7.0

TYPICAL LAYOUT TC1301A

FIGURE 7-1:

MSOP8 Silk Screen Layer.

When doing the physical layout for the TC1301A/B, the

highest priority is placing the input and output

capacitors as close to the device pins as is practical.

Figure 7-1 above represents a typical placement of the

components when using SMT0805 capacitors.

FIGURE 7-2:

MSOP8 Wiring Layer.

A wiring example for the TC1301A is shown. The vias

represent the connection to a ground plane that is

below the wiring layer.

FIGURE 7-3:

3x3 DFN Silk-Screen

Example.

8-lead 3X3 DFN physical layout example with bypass

capacitor.

FIGURE 7-4:

3x3 DFN Top Metal Layer

Example.

Vias represent the connection to a ground plane that is

below the wiring layer.

8.0

ADDITIONAL OUTPUT

VOLTAGE AND THRESHOLD

VOLTAGE OPTIONS

8.1

Output Voltage and Threshold

Voltage Range

Table 8-1 describes the range of output voltage options

available for the TC1301A/B. VOUT1 and VOUT2 can be

factory preset from 1.5V to 3.3V in 100 mV increments.

The VDET (TC1301A) or threshold voltage (TC1301B)

can be preset from 2.2V to 3.2V in 10 mV increments.

TABLE 8-1:

CUSTOM OUTPUT VOLTAGE

AND THRESHOLD VOLTAGE

RANGES

For a listing of TC1301A/B standard parts, refer to the

Product Identification System on page 25.

TJ =TJRISE + TA(MAX)

TJ = 83.1°C

3X3DFN8 (41° C/W R

JA)

PD(MAX) = (125°C - 50°C) / 41° C/W

PD(MAX) = 1.83 Watts

MSOP8 (208° C/W R

JA)

PD(MAX) = (125°C - 50°C) / 208° C/W

PD(MAX) = 0.360 Watts

VOUT1

VOUT2

VDET Threshold

1.5V to 3.3V

2.2V to 3.2V

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