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| LT1108 Datasheet, PDF (2/12 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V | |||
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LT1108
ABSOLUTE AXI U RATI GS
Supply Voltage (VIN) ............................................... 36V
SW1 Pin Voltage (VSW1) ......................................... 50V
SW2 Pin Voltage (VSW2) ............................ â 0.5V to VIN
Feedback Pin Voltage (LT1108) ............................. 5.5V
Sense Pin Voltage (LT1108, -5, -12) ...................... 36V
Maximum Power Dissipation ............................ 500mW
Maximum Switch Current ...................................... 1.5A
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ â 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE*)
7 SET
6 A0
5 GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 90°C, θJA = 130°C/W
ORDER PART
NUMBER
LT1108CN8
LT1108CN8-5
LT1108CN8-12
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE*)
7 SET
6 A0
5 GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
*FIXED VERSIONS
TJMAX = 90°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1108CS8
LT1108CS8-5
LT1108CS8-12
S8 PART MARKING
1108
10805
10812
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V, unless otherwise noted.
SYMBOL
IQ
PARAMETER
Quiescent Current
Quiescent Current, Boost Mode Configuration
VIN
Input Voltage
Comparator Trip Point Voltage
VOUT
Output Sense Voltage
Comparator Hysteresis
Output Hysteresis
fOSC
Oscillator Frequency
Duty Cycle
tON
Switch-ON Time
Feedback Pin Bias Current
Set Pin Bias Current
VOL
Gain Block Output Low
Reference Line Regulation
VSAT
SWSAT Voltage, Step-Up Mode
CONDITIONS
Switch OFF
No Load
LT1108-5
LT1108-12
Step-Up Mode
Step-Down Mode
LT1108 (Note 1)
LT1108-5 (Note 2)
LT1108-12 (Note 2)
LT1108
LT1108-5
LT1108-12
Full Load, Step-Up Mode
ILIM Tied to VIN, Step-Up Mode
LT1108, VFB = 0V
VSET = VREF
ISINK = 100µA, VSET = 1V
2V ⤠VIN ⤠5V
5V ⤠VIN ⤠30V
VIN = 3V, ISW = 650mA
VIN = 5V, ISW = 1A
MIN
q
q
2
q
q 1.2
q 4.75
q 11.4
q
q
q
q 14
q 63
q 28
q
q
q
q
q
q
TYP
110
135
250
1.245
5
12
5
20
50
19
70
36
10
20
0.15
0.20
0.02
0.5
0.8
MAX
150
12.6
30.0
1.3
5.25
12.6
10
40
100
25
78
48
50
100
0.4
0.400
0.075
0.65
1.00
UNITS
µA
µA
µA
V
V
V
V
V
mV
mV
mV
kHz
%
µs
nA
nA
V
%/ V
%/ V
V
V
2
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