LT1111
ABSOLUTE
AXI U
RATI GS
U
W W
W
(Note 1)
Supply Voltage (V
IN
) ............................................... 36V
SW1 Pin Voltage (V
SW1
) ......................................... 50V
SW2 Pin Voltage (V
SW2
) ............................ – 0.5V to V
IN
Feedback Pin Voltage (LT1111) ............................. 5.5V
Switch Current ....................................................... 1.5A
Maximum Power Dissipation ............................ 500mW
Operating Temperature Range
LT1111C ............................................... 0°C to 70°C
LT1111I ......................................... – 40°C to 105°C
LT1111M
(OBSOLETE) .............
– 55°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
I
LIM
1
V
IN
2
SW1 3
SW2 4
8
7
6
5
FB (SENSE)*
SET
A0
GND
ORDER PART
NUMBER
LT1111CN8
LT1111CN8-5
LT1111CN8-12
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
T
JMAX
= 90°C,
θ
JA
= 130°C/W (N)
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 150°C,
θ
JA
= 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.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
IN
= 3V, Military or Commercial Version
SYMBOL
I
Q
V
IN
PARAMETER
Quiescent Current
Input Voltage
Comparator Trip Point Voltage
V
OUT
Output Sense Voltage
Comparator Hysteresis
Output Hysteresis
f
OSC
DC
t
ON
V
SAT
Oscillator Frequency
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch ON Time: Step-Up Mode
Step-Down Mode
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
Full Load
I
LIM
Tied to V
IN
V
OUT
, = 5V, V
IN
= 12V
V
IN
= 3.0V, I
SW
= 650mA
V
IN
= 5.0V, I
SW
= 1A
V
IN
= 12V, I
SW
= 650mA
CONDITIONS
Switch OFF
Step-Up Mode
Step-Down Mode
LT1111 (Note 2)
LT1111-5 (Note 3
LT1111-12 (Note 3)
LT1111
LT1111-5
LT1111-12
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
2
U
TOP VIEW
I
LIM
1
V
IN
2
SW1 3
SW2 4
8
7
6
5
FB (SENSE)*
SET
A0
GND
W
U
ORDER PART
NUMBER
LT1111CS8
LT1111CS8-5
LT1111CS8-12
S8 PART MARKING
1111
11115
11111
1111I
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
T
JMAX
= 90°C,
θ
JA
= 150°C/W
MIN
2.0
1.20
4.75
11.40
TYP
300
MAX
400
12.6
30.0
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
%
%
µs
µs
V
V
V
1111fd
1.25
5.00
12.00
8
32
75
1.30
5.25
12.60
12.5
50
120
88
59
50
9
7.8
0.65
1.0
1.5
54
43
24
5
3.3
72
50
34
7
5
0.5
0.8
1.1
LINER [ LINEAR TECHNOLOGY ]
