Datasheet

2
LT1107
1107fa
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage (V
IN
)............................................... 36V
SW1 Pin Voltage (V
SW1
)......................................... 50V
SW2 Pin Voltage (V
SW2
)............................ –0.5V to V
IN
Feedback Pin Voltage (LT1107) ................................ 5V
Sense Pin Voltage (LT1107-5, LT1107-12) ............ 36V
Maximum Power Dissipation ............................ 500mW
Set Pin Voltage ...................................................... 5.5V
Maximum Switch Current ...................................... 1.5A
Operating Temperature Range
LT1107C................................................ 0°C to 70°C
LT1107I............................................ –45°C to 85°C
LT1107M(OBSOLETE) ...............–55°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating
temperature range, V
IN
= 3V, military or commercial version, T
A
= 25°C, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch OFF 320 450 µA
Quiescent Current, Step-Up Mode Configuration No Load LT1107-5 360 µA
LT1107-12 550 µA
V
IN
Input Voltage Step-Up Mode ● 2 12.6 V
Step-Down Mode
● 30.0 V
Comparator Trip Point Voltage LT1107 (Note 2) ● 1.2 1.25 1.3 V
V
OUT
Output Sense Voltage LT1107-5 (Note 3) ● 4.75 5 5.25 V
LT1107-12 (Note 3) ● 11.40 12 12.60 V
Comparator Hysteresis LT1107 ● 8 12.5 mV
Output Hysteresis LT1107-5 ● 32 50 mV
LT1107-12
● 75 120 mV
f
OSC
Oscillator Frequency 50 63 77 kHz
Duty Cycle, Step-Up Mode Full Load 64 70 76 %
t
ON
Switch ON Time, Step-Up Mode I
LIM
Tied to V
IN
8.8 11 12.7 µs
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
LT1107CN8
LT1107CN8-5
LT1107CN8-12
LT1107CS8
LT1107CS8-5
LT1107CS8-12
LT1107IS8
T
JMAX
= 90°C, θ
JA
= 130°C/W (N)
T
JMAX
= 90°C, θ
JA
= 150°C/W
1107
11075
110712
1107I
S8 PART MARKING
1
2
3
4
8
7
6
5
TOP VIEW
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
AO
GND
N8 PACKAGE
8-LEAD PLASTIC DIP
* FIXED VERSIONS
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
I
LIM
V
IN
SW1
SW2
FB(SENSE)*
SET
AO
GND
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 150°C, θ
JA
= 120°C/W (J)
LT1107MJ8
LT1107MJ8-5
LT1107MJ8-12
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source