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LT1105C Datasheet(PDF) 4 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) 4 Page - Linear Technology

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LT1103/LT1105
VIN = 20V, VC = 0.85V, OVLO = 0V, VSW Open, TA = 25°C, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITONS
MIN
TYP
MAX
UNIT
DC
Preset Max Switch Duty Cycle
FB = 4V, VC = Open, fOSC = 40kHz, ISW = 25mA,
q
58
65
72
%
(LT1103)
Note: Maximum Duty Cycle Can Be Altered at OSC Pin
Preset Max Switch Duty Cycle
FB = 4V, VC = Open, fOSC = 40kHz, ISW = 25mA,
q
56
63
70
%
(LT1105)
Note: Maximum Duty Cycle Can Be Altered at OSC Pin
Industrial Grade
q
55
75
%
OVLO Threshold
Overvoltage Lockout Threshold at Which Switching is Inhibited
q
2.3
2.5
2.7
V
Industrial Grade
q
2.2
2.8
V
OVLO Input Bias Current
OVLO = 2V, Measured Out of Pin (Note 2)
q
1.0
3.0
µA
VFB
FB Threshold Voltage
I(VC) = 0mA
4.425
4.50
4.575
V
q
4.400
4.50
4.600
V
FB Input Bias Current
FB = VFB (Note 3)
q
510
20
µA
Industrial Grade
q
422
µA
Change in FB Input
FB = VFB, VC = 1V to 4V (Note 3)
8
11
13
µA/V
Bias Current with Change in VC
q
711
14
µA/V
Industrial Grade
q
615
µA/V
FB Threshold Line Regulation
10V < VIN < 30V
q
0.025
0.10
%/V
gm
Error Amp Transconductance
∆I(VC) = ±50µA
9000 12000 17500
µmho
q
6000 12000 20000
µmho
Industrial Grade
q
5000
24000
µmho
AV
Error Amp Voltage Gain
1V < VC < 3V
q
500
1250
V/V
Industrial Grade
q
450
V/V
VC Switching Threshold
Switch Duty Cycle = 0%
q
0.85
1.25
1.4
V
Shutdown Threshold Voltage
q
50
150
250
mV
Industrial Grade
q
50
300
mV
Error Amp Source Current
q
150
275
µA
Error Amp Sink Current
q
1.5
3
4.5
mA
Industrial Grade
q
0.7
4.5
mA
Error Amp Clamp Voltage
FB = 4.75V
q
0.3
0.7
0.9
V
FB = 4.0V
q
4.2
4.4
4.6
V
Soft-Start Charging Current
SS = 0V
q
25
40
60
µA
Industrial Grade
q
20
75
µA
Soft-Start Reset Current
VIN = 6V, SS = 0.3V
q
12
mA
Output Switch Leakage
VSW = 45V
q
500
µA
(LT1103)
VSW = 15V
q
200
µA
BV
Switch Breakdown Voltage
ISW = 5mA
q
50
70
V
(LT1103)
VSW Current Limit (LT1103)
Duty Cycle = 25% (Note 4)
q
2.0
2.5
3.0
A
Output Switch On Resistance
q
0.4
0.75
Ω
(LT1103)
∆IIN
IQ Increase During Switch On Time
ISW = 0.5A to 1.5A
q
30
50
mA/A
∆ISW
(LT1103)
Switch Output High Level
ISW = 200mA, VGATE = 15V
q
13.00
13.5
V
(LT1105)
ISW = 750mA, VGATE = 15V
q
12.50
13.2
V
Switch Output High Level
ISW = 200mA, VGATE = 15V
q
12.75
V
Industrial Grade
ISW = 750mA, VGATE = 15V
q
12.25
V



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