LT1956/LT1956-5
ABSOLUTE
AXI U
RATI GS
Input Voltage (V
IN
) ................................................. 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, SENSE Voltage (LT1956-5) ........................... 7V
SHDN Voltage ........................................................... 6V
BIAS Pin Voltage .................................................... 30V
FB Pin Voltage/Current (LT1956) ................... 3.5V/2mA
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND
SW
NC
V
IN
NC
BOOST
NC
GND
1
2
3
4
5
6
7
8
16 GND
15 SHDN
14 SYNC
13 NC
12 FB/SENSE
11 V
C
10 BIAS
9
GND
ORDER PART
NUMBER
LT1956EFE
LT1956IFE
LT1956EFE-5
LT1956IFE-5
FE PART MARKING
1956EFE
1956IFE
1956EFE-5
1956IFE-5
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/ W,
θ
JC
(PAD) = 10°C/ W
EXPOSED BACKSIDE MUST BE SOLDERED
TO GROUND PLANE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
J
= 25°C.
V
IN
= 15V, V
C
= 1.5V, SHDN = 1V, Boost o/c, SW o/c, unless otherwise noted.
PARAMETER
Reference Voltage (LT1956)
SENSE Voltage (LT1956-5)
SENSE Pin Resistance (LT1956-5)
FB Input Bias Current (LT1956)
Error Amp Voltage Gain
Error Amp g
m
V
C
to Switch g
m
EA Source Current
EA Sink Current
V
C
Switching Threshold
V
C
High Clamp
FB = 1V or V
SENSE
= 4.1V
FB = 1.4V or V
SENSE
= 5.7V
Duty Cycle = 0
SHDN = 1V
q
q
q
CONDITIONS
5.5V
≤
V
IN
≤
60V
V
OL
+ 0.2
≤
V
C
≤
V
OH
– 0.2
5.5V
≤
V
IN
≤
60V
V
OL
+ 0.2
≤
V
C
≤
V
OH
– 0.2
q
q
(Notes 2, 9)
dl (V
C
) =
±10µA
(Note 9)
q
2
U
U
W
W W
U
W
(Note 1)
Operating Junction Temperature Range
LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5
(Notes 8, 10) ..................................... – 40°C to 125°C
LT1956IFE/LT1956IFE-5/LT1956IGN/LT1956IGN-5
(Notes 8, 10) ..................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TOP VIEW
GND
SW
NC
V
IN
NC
BOOST
NC
GND
1
2
3
4
5
6
7
8
16 GND
15 SHDN
14 SYNC
13 NC
12 FB/SENSE
11 V
C
10 BIAS
9
GND
ORDER PART
NUMBER
LT1956EGN
LT1956IGN
LT1956EGN-5
LT1956IGN-5
GN PART MARKING
1956
1956I
19565
1956I5
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 85°C/ W,
θ
JC
(PIN 8) = 25°C/ W
FOUR CORNER PINS SOLDERED
TO GROUND PLANE
MIN
1.204
1.195
4.94
4.90
9.5
200
1500
1000
125
100
TYP
1.219
5
13.8
0.5
400
2000
1.7
225
225
0.9
2.1
MAX
1.234
1.243
5.06
5.10
19
1.5
3000
3200
400
450
UNITS
V
V
V
V
kΩ
µA
V/V
µMho
µMho
A/V
µA
µA
V
V
1956f
LINER [ LINEAR TECHNOLOGY ]
