LT1370
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Voltage
LT1370 ............................................................... 35V
LT1370HV .......................................................... 42V
S/S, SHDN, SYNC Pin Voltage ................................ 30V
Feedback Pin Voltage (Transient, 10ms) .............. ±10V
Feedback Pin Current ........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms) ............................................. ±10V
Operating Ambient Temperature Range ...... 0°C to 70°C
Operating Junction Temperature Range
Commercial .......................................... 0°C to 125°C
Industrial ......................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
7 VIN
6 NFB
TAB 5 VSW
IS 4 GND
GND 3 S/S
2 FB
1 VC
R PACKAGE
7-LEAD PLASTIC DD
TJMAX = 125°C, θJA = 30°C/W, θJC = 4°C/W
WITH PACKAGE SOLDERED TO 0.5 INCH2 COPPER
AREA OVER BACKSIDE GROUND PLANE OR INTERNAL
POWER PLANE. θJA CAN VARY FROM 20°C/W TO
> 40°C/W DEPENDING ON MOUNTING TECHNIQUE
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1370CR
LT1370HVCR
LT1370IR
LT1370HVIR
FRONT VIEW
7 VIN
6 NFB
TAB 5 VSW
IS 4 GND
GND 3 S/S
2 FB
1 VC
T7 PACKAGE
7-LEAD TO-220
TJMAX = 125°C, θJA = 50°C/W, θJC = 4°C/W
ORDER PART
NUMBER
LT1370CT7
LT1370HVCT7
LT1370IT7
LT1370HVIT7
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
VREF Reference Voltage
IFB Feedback Input Current
Reference Voltage Line Regulation
VNFR Negative Feedback Reference Voltage
INFB Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
gm Error Amplifier Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
2.7V ≤ VIN ≤ 25V, VC = 0.8V
Measured at Negative Feedback Pin
Feedback Pin Open, VC = 0.8V
VNFB = VNFR
2.7V ≤ VIN ≤ 25V, VC = 0.8V
MIN
1.230
q 1.225
q
q
– 2.525
q – 2.560
q – 45
q
∆IC = ±25µA
VFB = VREF – 150mV, VC = 1.5V
VFB = VREF + 150mV, VC = 1.5V
1100
q 700
q 120
q
TYP
1.245
1.245
250
0.01
– 2.48
– 2.48
– 30
0.01
1500
200
1400
MAX
1.260
1.265
550
900
0.03
– 2.435
– 2.400
– 15
0.05
UNITS
V
V
nA
nA
%/ V
V
V
µA
%/V
1900 µmho
2300 µmho
350 µA
2400 µA
2
