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LT1108 Datasheet(PDF) 2 Page - Linear Technology

Part No. LT1108
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1108 Datasheet(HTML) 2 Page - Linear Technology

 
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LT1108
A
G
A
U
A
R
BSOLUTEXI
TI
S
Supply Voltage (VIN) ............................................... 36V
SW1 Pin Voltage (VSW1) ......................................... 50V
SW2 Pin Voltage (VSW2) ............................ – 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 ................ – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300
°C
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
LT1108CS8
LT1108CS8-5
LT1108CS8-12
S8 PART MARKING
ORDER PART
NUMBER
LT1108CN8
LT1108CN8-5
LT1108CN8-12
TJMAX = 90°C, θJA = 150°C/W
TJMAX = 90°C, θJA = 130°C/W
1
2
3
4
8
7
6
5
TOP VIEW
ILIM
VIN
SW1
SW2
FB (SENSE*)
SET
A0
GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
1
2
3
4
8
7
6
5
TOP VIEW
ILIM
VIN
SW1
SW2
FB (SENSE*)
SET
A0
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
*FIXED VERSIONS
ELECTRICAL C
C
HARA TERISTICS T
A = 25°C, VIN = 3V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
Switch OFF
q
110
150
µA
Quiescent Current, Boost Mode Configuration
No Load
LT1108-5
135
µA
LT1108-12
250
µA
VIN
Input Voltage
Step-Up Mode
q
2
12.6
V
Step-Down Mode
q
30.0
V
Comparator Trip Point Voltage
LT1108 (Note 1)
q
1.2
1.245
1.3
V
VOUT
Output Sense Voltage
LT1108-5 (Note 2)
q
4.75
5
5.25
V
LT1108-12 (Note 2)
q
11.4
12
12.6
V
Comparator Hysteresis
LT1108
q
510
mV
Output Hysteresis
LT1108-5
q
20
40
mV
LT1108-12
q
50
100
mV
fOSC
Oscillator Frequency
q
14
19
25
kHz
Duty Cycle
Full Load, Step-Up Mode
q
63
70
78
%
tON
Switch-ON Time
ILIM Tied to VIN, Step-Up Mode
q
28
36
48
µs
Feedback Pin Bias Current
LT1108, VFB = 0V
q
10
50
nA
Set Pin Bias Current
VSET = VREF
q
20
100
nA
VOL
Gain Block Output Low
ISINK = 100µA, VSET = 1V
q
0.15
0.4
V
Reference Line Regulation
2V
≤ VIN ≤ 5V
q
0.20
0.400
%/V
5V
≤ VIN ≤ 30V
q
0.02
0.075
%/V
VSAT
SWSAT Voltage, Step-Up Mode
VIN = 3V, ISW = 650mA
q
0.5
0.65
V
VIN = 5V, ISW = 1A
0.8
1.00
V
1108
10805
10812


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