TPS65921 datasheet(13/66 Pages) TI

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TPS65921

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SWCS048G – MARCH 2010 – REVISED SEPTEMBER 2014

4.4

Thermal Resistance Characteristics for ZQZ Package

NAME

DESCRIPTION

°C/W(1) (2)

AIR FLOW (m/s)(3)

ΘJC

Junction-to-case

0.00

ΘJB

Junction-to-board

0.00

ΘJA

Junction-to-free air

0.00

PsiJT

Junction-to-package top

0.3

0.00

PsiJB

Junction-to-board

0.00

(1)

°C/W = degrees Celsius per watt.

(2)

These values are based on a JEDEC-defined 2S2P system (with the exception of the Theta JC [R

ΘJC] value, which is based on a

JEDEC-defined 1S0P system) and will change based on environment as well as application. For more information, see these

EIA/JEDEC standards:

•

JESD51-2, Integrated Circuits Thermal Test Method Environmental Conditions - Natural Convection (Still Air)

•

JESD51-3, Low Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages

•

JESD51-7, High Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages

•

JESD51-9, Test Boards for Area Array Surface Mount Package Thermal Measurements

Power dissipation of 2 W and an ambient temperature of 70ºC is assumed.

(3)

m/s = meters per second.

4.5

Crystal Oscillator

When selecting a crystal, the system designer must consider the temperature and aging characteristics of a

crystal versus the user environment and expected lifetime of the system. The following table lists the switching

characteristics of the oscillator.

Table 4-1. Base Oscillator Switching Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

Crystal: Internal capacitor on each input (Cint)

Crystal: Parallel input capacitance (Cpin)

1.0

Parallel resonance crystal frequency

32.768

kHz

Pin-to-pin capacitance

1.6

1.8

Maximum drive power

1.0

µW

Operating drive level

0.5

µW

Crystal quality factor

13k

54k

Start-up time, all conditions

500

tSX

Start-up time, 25°C

360

Active current

High jitter mode

1.8

IDDA

consumption (configured

µA

0.8

Low jitter mode

through the LOJIT bit)

Low battery mode (1.2 V)

IDDQ

Current consumption

µA

Startup

Specifications

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