Datasheet
IN
OUT
COMP
SENSE
INPUT
TIMER
SENSE
GND
SUPPLY
SUPPLY
GND
1
2
3
4 5
6
7
8
LM1949N
LM1949
SNLS349C –FEB 1995–REVISED MARCH 2013
www.ti.com
Figure 2. Package Number P0008E
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1)(2)
Supply Voltage 8V
Power Dissipation
(3)
1235 mW
Input Voltage Range −0.3V to V
CC
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Junction Temperature 150°C
Lead Temp. (Soldering 10 sec.) 260°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) For operation in ambient temperatures above 25°C, the device must be derated based on a 150°C maximum junction temperature and a
thermal resistance of 100°C/W junction to ambient.
Electrical Characteristics
(V
CC
= 5.5V, V
IN
= 2.4V, T
J
= 25°C, Figure 1, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
I
CC
Supply Current
Off V
IN
= 0V 11 23 mA
Peak Pin 8 = 0V 28 54 mA
Hold Pin 8 Open 16 26 mA
V
OH
Input On Level V
CC
= 5.5V 1.4 2.4 V
V
CC
= 3.0V 1.2 1.6 V
V
OL
Input Off Level V
CC
= 5.5V 1.0 1.35 V
V
CC
= 3.0V 0.7 1.15 V
I
B
Input Current −25 3 +25 µA
I
OP
Output Current
Peak Pin 8 = 0V −10 −22 mA
Hold Pin 8 Open −1.5 −5 mA
V
S
Output Saturation Voltage 10 mA, V
IN
= 0V 0.2 0.4 V
V
P
Sense Input
Peak Threshold V
CC
= 4.75V 350 386 415 mV
V
H
Hold Reference 88 94 102 mV
t Time-out, t t ÷ R
T
C
T
90 100 110 %
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