LT1072CN8 Datasheet, PDF (2/16 Pages) Linear Technology – 1.25A High Efficiency Switching Regulator

LT1072
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
LT1072HV (See Note 1) ......................................... 60V
LT1072 (See Note 1) ............................................. 40V
Switch Output Voltage
LT1072HV ............................................................. 75V
LT1072 .................................................................. 65V
LT1072S8 .............................................................. 60V
Feedback Pin Voltage (Transient, 1ms) ................. ±15V
Operating Junction Temperature Range
LT1072HVM, LT1072M (OBSOLETE) .... –55°C to 150°C
LT1072HVC, LT1072C (Oper.)* ............0°C to 100°C
LT1072HVC, LT1072C (Sh. Ckt.)* ........0°C to 125°C
LT1072HVI ....................................... –40°C to 125°C
Storage Temperature Range ............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............... 300°C
*Includes LT1072S8
UW U
PACKAGE/ORDER I FOR ATIO
Note 1: Minimum switch “on” time for the LT1072 in current limit is
≈ 0.7µsec. This limits the maximum input voltage during short-circuit
conditions, in the buck and inverting modes onlyt,o ≈ 40V. Normal
(unshorted) conditions are not affected. If the LT1072 is being operated in
the buck or inverting mode at high input voltages and short-circuit
conditions are expected, a resistor must be placed in series with the
inductor, as follows:
The value of the resistor is given by:
R
=
(t)
(f) (V_IN)
I_(LIMIT)
–
V_f
– R_L
t = Minimum “on” time of LT1072 in current limit, ≈ 0.7µs
f = Operating frequency (40kHz)
V_f = Forward voltage of external catch diode at I_(LIMIT)
I_(LIMIT) = Current limit of LT1072 (2A)
R_L = Internal series resistance of inductor
BOTTOM VIEW
V_SW
12
43
V_C
CASE IS
GND
V_IN
FB
K PACKAGE
4-LEAD TO-3 METAL CAN
T_JMAX = 150°C, θ_JC = 8°C/W, θ_JA = 35°C/W
T_JMAX = 100°C*, θ_JC = 8°C/W, θ_JA = 35°C/W
ORDER PART
NUMBER
LT1072HVMK
LT1072MK
LT1072HVCK
LT1072CK
TOP VIEW
GND 1
V_C 2
FB ³
NC 4
8 E2
7 V_SW
6 E1
5 V_IN
N PACKAGE
8-LEAD PDIP
T_JMAX = 100°C, θ_JA = 130°C/W
TOP VIEW
GND 1
V_C 2
FB 3
NC ⁴
8 E2
7 V_SW
6 E1
5 _VIN
S8 PACKAGE
8-LEAD PLASTIC SO
T_JMAX = 100°C, θ_JA = 130°C/W
OBSOLETE PACKAGE
J PACKAGE
8-LEAD CERAMIC DIP
T_JMAX = 150°C, θ_JA = 100°C/W
OBSOLETE PACKAGE
Consider the S8 or N8 Packages for Alternate Source
FRONT VIEW
ORDER PART
NUMBER
5
V_IN
4
V_SW
3
GND
2
FB
1
V_C
T PACKAGE
5-LEAD TO-220
T_JMAX = 100°C/W, θ_JC = 8°C/W, θ_JA = 50°C/W
LT1072CT
LT1072HVCT
LT1072HVIT
TOP VIEW
NC 1
NC 2
GND 3
V_C 4
FB 5
NC 6
NC ⁷
NC ⁸
16 NC
15 NC
14 E2
13 V_SW
12 E1
11 V_IN
10 NC
9 _NC
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T_JMAX = 100°C, θ_JC = 130°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
ORDER PART
NUMBER
LT1072CN8
LT1072CS8
S8 PART
MARKING
1072
LT1072MJ8
LT1072CJ8
ORDER PART
NUMBER
LT1072CSW
LT1072 • POI01
1072fc