Electrical Characteristics (Continued)
=
=
=
=
VCC5V 5V, VCC12V 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA TJ +25˚C.
Limits appearing in boldface type apply over the entire operating temperature range.
Symbol
Parameter
Conditions
Min
3
Typ
Max
12
Units
VOCC_CM
Over-current Comparator
Common Mode Range
V
=
=
=
=
IB_OC+
IB_OC−
VOS_OCC
OC+ Input Bias Current
VIN 5V, OC+ 5V, OC−
4V
100
85
2
145
125
200
165
42
µA
µA
=
=
OC− Input Bias Current
VIN 5V, OC+ 6V, OC−
5V
=
Over-current Comparator Input
Offset Voltage
VIN 5V
16
21
mV
=
VIN 12V
=
%
DMAX
gm
Maximun Duty Cycle
FB 0V
78
Error Amplifier
1.36
mmho
Transconductance
Vramp
Ramp Signal Peak-to-Peak
Amplitude
2
V
Icomp
COMP Pin Source Current
COMP Pin Sink Current
COMP Pin High Clamp
COMP Pin Low Clamp
Power On Reset Trip Point
250
160
400
280
2.9
550
400
µA
µA
V
Icomp
Vcomp_hi
Vcomp_lo
VPOR
0.19
4.0
V
Vcc5V Pin Voltage Rising
Vcc5V Pin Voltage Falling
(Note 7)
V
V
3.6
Vcc12V Minimum Working
Voltage
3.8
=
tSS
Soft Start Delay
FOSC 8MHz
1.6
ms
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings do not imply guaranteed performance limits.
Note 2: Maximum allowable power dissipation is a function of the maximum junction temperature, T , the junction-to-ambient thermal resistance, θ , and the
JMAX
JA
=
ambient temperature, T . The maximum allowable power dissipation at any ambient temperature is calculated using:
P
(T
− T )/θ . The
JMAX A JA
A
MAX
junction-to-ambient thermal resistance, θ , for LM2639 is 78˚C/W. For a T
of 150˚C and T of 25˚C, the maximum allowable power dissipation is 1.6W.
A
JA
JMAX
Note 3: The letter N stands for the typical output voltages appearing in italic boldface type in Table 1.
Note 4: Max value of logic low means any voltage below this value is guaranteed to be taken as logic low whereas a voltage higher than this value is not guaranteed
to be taken as a logic low.
Note 5: Min value of logic high means any voltage above this value is guaranteed to be taken as logic high whereas a voltage lower than this value is not guaranteed
to be taken as a logic high.
Note 6: When driving bipolar FET drivers in the typical application circuit.
Note 7: When Vcc12V pin goes below this voltage, all DRV pins go to 0V.
Note 8: ESD ratings for pins DRV0, DRV1, DRV2 and DRV3 is 1kV. ESD rating for all other pins is 2kV.
3
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