LMH6572 datasheet(11/12 Pages) NSC

11 / 12 page

Other Applications (Continued)

POWER DISSIPATION

The LMH6572 is optimized for maximum speed and perfor-

mance in the small form factor of the standard SSOP pack-

age. To achieve its high level of performance, the LMH6572

consumes 23 mA of quiescent current, which cannot be

neglected when considering the total package power dissi-

pation limit. To ensure maximum output drive and highest

performance, thermal shutdown is not provided. Therefore, it

is of utmost importance to make sure that the T

JMAX is never

exceeded due to the overall power dissipation.

Follow these steps to determine the Maximum power dissi-

pation for the LMH6572:

Calculate the quiescent (no-load) power: P

AMP =ICC*

S), where VS =V

+ -V−.

Calculate the RMS power dissipated in the output stage:

D (rms) = rms ((VS -VOUT)*IOUT), where VOUT and

OUT are the voltage across and the current through the

external load and V

S is the total supply voltage.

Calculate the total RMS power: P

T =PAMP +PD.

The maximum power that the LMH6572, package can dissi-

pate at a given temperature can be derived with the following

equation:

MAX = (150˚ – TAMB)/

JA, where TAMB = Ambient tempera-

ture (˚C) and

JA = Thermal resistance, from junction to

ambient, for a given package (˚C/W). For the SSOP package

JA is 125˚C/W.

ESD PROTECTION

The LMH6572 is protected against electrostatic discharge

(ESD) on all pins. The LMH6572 will survive 2000V Human

Body model and 200V Machine model events. Under normal

operation the ESD diodes have no effect on circuit perfor-

mance. There are occasions, however, when the ESD di-

odes will be evident. If the LMH6572 is driven by a large

signal while the device is powered down the ESD diodes will

conduct. The current that flows through the ESD diodes will

either exit the chip through the supply pins or will flow

through the device, hence it is possible to power up a chip

with a large signal applied to the input pins. Shorting the

power pins to each other will prevent the chip from being

powered up through the input.

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