Datasheet

3
LT1619
1619fa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Input Current V
SENSE
= 0V ● –90 –120 –150 µA
Current Limit Delay 150 ns
Driver Output Rise Time C
L
= 3300pF 30 ns
Driver Output Fall Time C
L
= 3300pF 35 ns
Driver Output High Level I
OUT
= –20mA V
DRV
– 0.6 V
DRV
– 0.35 V
I
OUT
= –200mA V
DRV
– 1.6 V
DRV
– 1.2 V
Driver Output Low Level I
OUT
= 20mA 100 200 mV
I
OUT
= 200mA 0.5 0.7 V
Shutdown Driver Output Level V
S/S
= 0V, I
OUT
= 20mA 100 200 mV
Idle Mode Driver Output Level V
S/S
= V
IN
, V
FB
= 1.5V, I
OUT
= 20mA 100 200 mV
S/S Pin Current V
S/S
= V
IN
4 µA
V
S/S
= 0V –2 µA
Operating Supply Current V
FB
= 1V 9 mA
Quiescent Supply Current V
S/S
= V
IN
, V
FB
= 1.5V ● 140 220 µA
Shutdown Supply Current V
S/S
= 0V 15 19 µA
V
S/S
= 0V, V
IN
= 18V, T
A
= 85°C40µA
Shutdown Threshold 0.45 1.2 V
Shutdown Delay 12 17 33 µs
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= V
DRV
= 2.5V, V
S/S
= V
IN
, COMP open, V
SENSE
= 0V unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LT1619E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: T
J
is calculated from the ambient temperature T
A
, the power
dissipation P
D
and the thermal resistance θ
JA
of the package according to
the formula:
T
J
= T
A
+ P
D
• θ
JA
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Bandgap Voltage vs Temperature I
S/S
vs V
S/S
S/S Pin Current vs Temperature
TEMPERATURE (°C)
–40
BANDGAP VOLTAGE (V)
1.241
1.243
80 100
1619 G01
–20 0 20 40 60 120
1.245
1.235
1.227
1.225
1.233
1.231
1.229
1.237
1.239
V
IN
= 2.5V
V
S/S
(V)
0
I
S/S
(µA)
5
4
3
2
1
0
–1
–2
–3
4.0
1619 G02
1.0 2.0 3.0 5.03.50.5 1.5 2.5 4.5
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
TEMPERATURE (°C)
–40
S/S PIN CURRENT (µA)
1
3
120
1619 G03
–1
–3
0
40
80
–20
20
60
100
5
0
2
–2
4
V
S/S
= 0V
V
S/S
= 2.5V