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| LT1111_15 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 (Note 1)
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 (OBSOLETE) ............. 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
ORDER PART
NUMBER
LT1111CN8
LT1111CN8-5
LT1111CN8-12
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 90°C, θJA = 130°C/W (N)
J8 PACKAGE
8-LEAD CERAMIC DIP
TJMAX = 150°C, θJA = 120°C/W (J)
LT1111MJ8
LT1111MJ8-5
LT1111MJ8-12
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
LT1111IS8
S8 PART MARKING
1111
11115
11111
1111I
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.VIN = 3V, Military or Commercial Version
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IQ
Quiescent Current
VIN
Input Voltage
Switch OFF
Step-Up Mode
Step-Down Mode
q 2.0
q
300 400
12.6
30.0
Comparator Trip Point Voltage
LT1111 (Note 2)
q 1.20 1.25 1.30
VOUT
Output Sense Voltage
LT1111-5 (Note 3
LT1111-12 (Note 3)
q 4.75 5.00 5.25
q 11.40 12.00 12.60
Comparator Hysteresis
LT1111
q
8
12.5
Output Hysteresis
LT1111-5
LT1111-12
q
32
50
q
75
120
fOSC
Oscillator Frequency
DC
Duty Cycle: Step-Up Mode
Step-Down Mode
Full Load
54
72
88
43
50
59
24
34
50
tON
Switch ON Time: Step-Up Mode
Step-Down Mode
VSAT
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
ILIM Tied to VIN
VOUT, = 5V, VIN = 12V
VIN = 3.0V, ISW = 650mA
VIN = 5.0V, ISW = 1A
VIN = 12V, ISW = 650mA
5
7
9
3.3
5
7.8
0.5
0.65
0.8
1.0
1.1
1.5
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
%
%
µs
µs
V
V
V
1111fd
2
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