MMPF0100 datasheet(12/136 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

General Product Characteristics

Thermal Characteristics

5.2

Thermal Characteristics

5.2.1

Power Dissipation

During operation, the temperature of the die should not exceed the operating junction temperature noted in Table 5. To optimize

the thermal management and to avoid overheating, the PF0100 provides thermal protection. An internal comparator monitors the

die temperature. Interrupts THERM110I, THERM120I, THERM125I, and THERM130I will be generated when the respective

thresholds specified in Table 6 are crossed in either direction. The temperature range can be determined by reading the

THERMxxxS bits in register INTSENSE0.

In the event of excessive power dissipation, thermal protection circuitry will shut down the PF0100. This thermal protection will

act above the thermal protection threshold listed in Table 6. To avoid any unwanted power downs resulting from internal noise,

the protection is debounced for 8.0 ms. This protection should be considered as a fail-safe mechanism and therefore the system

should be configured such that this protection is not tripped under normal conditions.

Table 5. Thermal Ratings

Symbol

Description (Rating)

Min.

Max.

Unit

THERMAL RATINGS

Ambient Operating Temperature Range

-40

°C

Operating Junction Temperature Range (5)

-40

125

°C

TST

Storage Temperature Range

-65

150

°C

TPPRT

Peak Package Reflow Temperature (6)(7)

–

Note 7

°C

QFN56 THERMAL RESISTANCE AND PACKAGE DISSIPATION RATINGS

RθJA

Junction to Ambient (8)(9)(10)

Natural Convection

Four layer board (2s2p)

Eight layer board (2s6p)

–

°C/W

RθJMA

Junction to Ambient (@200 ft/min)(8)(10)

Four layer board (2s2p)

–

°C/W

RθJB

Junction to Board(11)

–10

°C/W

RΘJCBOTTOM

Junction to Case Bottom(12)

–

1.2

°C/W

ΨJT

Junction to Package Top(13)

Natural Convection

–

2.0

°C/W

Notes

Do not operate beyond 125 °C for extended periods of time. See Table 6 for thermal protection features.

Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may

cause a malfunction or permanent damage to the device.

Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow

Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes

and enter the core ID to view all orderable parts (i.e. MC33xxxD enter 33xxx), and review parametrics.

Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board)

temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal resistance.

The Board uses the JEDEC specifications for thermal testing (and simulation) JESD51-7 and JESD51-5.

10.

Per JEDEC JESD51-6 with the board horizontal.

11.

Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top

surface of the board near the package.

12.

Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883 Method 1012.1).

13.

Thermal characterization parameter indicating the temperature difference between package top and the junction temperature per

JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is written as Psi-JT.

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