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| LT1111 Datasheet, PDF (2/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V | |||
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LT1111
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 (LT1111) ............................. 5.5V
Switch Current ....................................................... 1.5A
Maximum Power Dissipation ............................ 500mW
Operating Temperature Range
LT1111C ............................................... 0°C to 70°C
LT1111I ......................................... â 40°C to 105°C
LT1111M ....................................... â 55°C to 125°C
Storage Temperature Range ................ â 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
ILIM 1
VIN 2
SW1 3
SW2 4
TOP VIEW
8 FB (SENSE)*
7 SET
6 A0
5 GND
J8 PACKAGE
N8 PACKAGE
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 150°C, θJA = 120°C/W (J)
TJMAX = 90°C, θJA = 130°C/W (N)
Consult factory for Industrial grade parts
ORDER PART
NUMBER
LT1111CN8
LT1111CN8-5
LT1111CN8-12
LT1111MJ8
LT1111MJ8-5
LT1111MJ8-12
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 A0
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
TJMAX = 90°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1111CS8
LT1111CS8-5
LT1111CS8-12
S8 PART MARKING
1111
11115
11111
ELECTRICAL CHARACTERISTICS VIN = 3V, Military or Commercial Version
SYMBOL
IQ
VIN
PARAMETER
Quiescent Current
Input Voltage
Comparator Trip Point Voltage
VOUT
Output Sense Voltage
Comparator Hysteresis
Output Hysteresis
fOSC
Oscillator Frequency
DC
Duty Cycle: Step-Up Mode
Step-Down Mode
tON
Switch ON Time: Step-Up Mode
Step-Down Mode
VSAT
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
IFB
Feedback Pin Bias Current
ISET
Set Pin Bias Current
VOL
Gain Block Output Low
CONDITIONS
Switch OFF
Step-Up Mode
Step-Down Mode
LT1111 (Note 1)
LT1111-5 (Note 2)
LT1111-12 (Note 2)
LT1111
LT1111-5
LT1111-12
Full Load
ILIM Tied to VIN
VOUT, = 5V, VIN = 12V
VIN = 3.0V, ISW = 650mA
VIN = 5.0V, ISW = 1A
VIN = 12V, ISW = 650mA
LT1111, VFB = 0V
VSET = VREF
ISINK = 300µA, VSET = 1.00V
MIN
q 2.0
q
q 1.20
q 4.75
q 11.40
q
q
q
54
43
24
5
3.3
q
q
q
TYP
300
1.25
5.00
12.00
8
32
75
72
50
34
7
5
0.5
0.8
1.1
70
70
0.15
MAX
400
12.6
30.0
1.30
5.25
12.60
12.5
50
120
88
59
50
9
7.8
0.65
1.0
1.5
120
300
0.4
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
%
%
µs
µs
V
V
V
nA
nA
V
2
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