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LT1105C Datasheet(PDF) 3 Page - Linear Technology

Part # LT1105C
Description  Offline Switching Regulator
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1105C Datasheet(HTML) 3 Page - Linear Technology

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3
LT1103/LT1105
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
ORDER PART
NUMBER
TJMAX = 100°C, θJA = 130°C/W
1
2
3
45
6
7
8
TOP VIEW
GND
15V
VSW
ILIM
VIN
OSC
FB
VC
N8 PACKAGE
8-LEAD PDIP
15V
VIN
OSC
GND
VC
FB
VSW
T7 PACKAGE
7-LEAD TO-220
FRONT VIEW
7
6
5
4
3
2
1
CASE IS CONNECTED TO GROUND. LEADS ARE FORMED
TJMAX = 100°C, θJA = 50°C/W
Consult factory for Military grade parts.
TJMAX = 100°C, θJA = 100°C/W
1
2
3
4
5
6
7
TOP VIEW
N PACKAGE
14-LEAD PDIP
PINS 1 AND 7 MUST BE TIED TOGETHER
14
13
12
11
10
9
8
PWRGND
OVLO
FB
VC
5V
SS
GND
VSW
NC
NC
15V
VIN
OSC
ILIM
ORDER PART
NUMBER
LT1103CT7
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Supply Current
8V < VIN < 30V, After Device Has Started
q
10
20
30
mA
ISTART
Start-Up Current
VIN < VIN Start Threshold
q
200
400
µA
Industrial Grade
q
450
µA
VIN Start Threshold
q
14.5
16.0
17.5
V
VIN Shutdown Threshold
Note: Switching Stops When VSW < 10V (LT1103)
q
5.0
7.0
8.0
V
Note: Switching Stops When VGATE < 10V (LT1105)
VREF
5V Reference Voltage
q
4.80
4.95
5.20
V
VREF Line Regulation
10V < VIN < 30V
q
0.025
0.1
%/ V
VREF Load Regulation
0mA < IL < 20mA
q
0.025
0.05
%/mA
VREF Short-Circuit Current
Commercial Grade
q
25
60
110
mA
Industrial Grade
q
20
120
mA
15V Short-Circuit Current
Commercial Grade
q
30
130
mA
Industrial Grade
q
25
140
mA
VGATE
15V Gate Bias Reference
17 < VIN < 30V, 0mA < IL < 30mA
q
13.8
15.0
16.2
V
15V Dropout Voltage
VIN = 15V, IL = 30mA
q
2.0
2.5
V
15V Short-Circuit Current
q
30
70
130
mA
SF
Oscillator Scaling Factor
FB = 4V, VC = Open, Measured at VSW, ISW = 25mA,
36
40
44
Hz •
µF
OVLO = 5V, fOSC = SF/COSC, 40kHz < fOSC < 200kHz
q
32
40
48
Hz •
µF
Oscillator Valley Voltage
2.0
V
Oscillator Peak Voltage
4.5
V
ELECTRICAL CHARACTERISTICS
LT1105CN
LT1105IN
LT1105CN8
LT1105IN8
VIN = 20V, VC = 0.85V, OVLO = 0V, VSW Open, TA = 25°C, unless otherwise noted.



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