LT1105_15 Datasheet, PDF (3/32 Pages) Linear Technology – Offline Switching Regulator

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