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LT1619 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT1619
Description  Low Voltage Current Mode PWM Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1619 Datasheet(HTML) 3 Page - Linear Technology

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LT1619
1619fa
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Sense Input Current
VSENSE = 0V
q
– 90
– 120
– 150
µA
Current Limit Delay
150
ns
Driver Output Rise Time
CL = 3300pF
30
ns
Driver Output Fall Time
CL = 3300pF
35
ns
Driver Output High Level
IOUT = – 20mA
VDRV – 0.6 VDRV – 0.35
V
IOUT = – 200mA
VDRV – 1.6
VDRV – 1.2
V
Driver Output Low Level
IOUT = 20mA
100
200
mV
IOUT = 200mA
0.5
0.7
V
Shutdown Driver Output Level
VS/S = 0V, IOUT = 20mA
100
200
mV
Idle Mode Driver Output Level
VS/S = VIN, VFB = 1.5V, IOUT = 20mA
100
200
mV
S/S Pin Current
VS/S = VIN
4
µA
VS/S = 0V
– 2
µA
Operating Supply Current
VFB = 1V
9
mA
Quiescent Supply Current
VS/S = VIN, VFB = 1.5V
q
140
220
µA
Shutdown Supply Current
VS/S = 0V
15
19
µA
VS/S = 0V, VIN = 18V, TA = 85°C40
µA
Shutdown Threshold
0.45
1.2
V
Shutdown Delay
12
17
33
µs
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = VDRV = 2.5V, VS/S = VIN, COMP open, VSENSE = 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: TJ is calculated from the ambient temperature TA, the power
dissipation PD and the thermal resistance θJA of the package according to
the formula:
TJ = TA + PD • θJA
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
Bandgap Voltage vs Temperature
IS/S vs VS/S
S/S Pin Current vs Temperature
TEMPERATURE (
°C)
–40
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
VIN = 2.5V
VS/S (V)
0
5
4
3
2
1
0
–1
–2
–3
4.0
1619 G02
1.0
2.0
3.0
5.0
3.5
0.5
1.5
2.5
4.5
TA = –40°C
TA = 25°C
TA = 85°C
TEMPERATURE (
°C)
–40
1
3
120
1619 G03
–1
–3
0
40
80
–20
20
60
100
5
0
2
–2
4
VS/S = 0V
VS/S = 2.5V


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