Datasheet

LM27222
www.ti.com SNVS306B –SEPTEMBER 2004–REVISED MARCH 2013
Absolute Maximum Ratings
(1)
V
CC
to GND -0.3V to 7V
CB to GND -0.3V to 36V
CB to SW -0.3V to 7V
SW to GND
(2)
-2V to 36V
LEN, IN, LG to GND -0.3V to V
CC
+ 0.3V ≤ 7V
HG to GND -0.3V to 36V
Junction Temperature +150°C
Power Dissipation
(3)
720mW
Storage Temperature −65° to 150°C
ESD Susceptibility
Human Body Model 2kV
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which
the device operates correctly. Operating Ratings do not imply ensured performance limits.
(2) The SW pin can have -2V to -0.5 volts applied for a maximum duty cycle of 10% with a maximum period of 1 second. There is no duty
cycle or maximum period limitation for a SW pin voltage range of -0.5V to 30 Volts.
(3) Maximum allowable power dissipation is a function of the maximum junction temperature, T
JMAX
, the junction-to-ambient thermal
resistance, θ
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated
using: P
MAX
= (T
JMAX
-T
A
) / θ
JA
. The junction-to-ambient thermal resistance, θ
JA
, for the LM27222M, it is 165°C/W. For a T
JMAX
of 150°C
and T
A
of 25°C, the maximum allowable power dissipation is 0.76W. The θ
JA
for the LM27222SD is 42°C/W. For a T
JMAX
of 150°C and
TA of 25°C, the maximum allowable power dissipation is 3W.
Operating Ratings
(1)
VCC 4V to 6.85V
Junction Temperature Range −40° to 125°C
CB (max) 33V
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which
the device operates correctly. Operating Ratings do not imply ensured performance limits.
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