LT3509 LINER [Linear Technology], LT3509 Datasheet - Page 3

• Manufacturer Part Number: LT3509
• Description: Dual 36V, 700mA Step-Down Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
V
V
Input Quiescent Current
Input Shutdown Current
Feedback Pin Voltage
Reference Voltage Line Regulation
RUN/SS Shutdown Threshold
RUN/SS Voltage for Full I
RUN/SS Pin Pull-up Current
Feedback Pin Bias Current
Switch Current Limit
DA Comparator Current Threshold
Boost Pin Current
Switch Leakage Current
Switch Saturation Voltage
Minumum Boost Voltage above Switch
Boost Diode Forward Voltage
Boost Diode Leakage
Switching Frequency
Switch Minimum Off Time
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device reliability
and lifetime.
Note 2. Absolute Maximum Voltage at the V
1 second transients and 36V for continuous operation.
Note 3. The LT3509E is guaranteed to meet performance specifi cations from
0°C to 125°C junction temperature. Specifi cations over the –40°C to 125°C
operating junction temperature range are assured by design, characterization
IN
IN
Undervoltage Lockout
Overvoltage Lockout
OUT
IN
pin is 60V for non-repetitive
CONDITIONS
Not Switching V
V(RUN/SS[1,2]) < 0.3V
3.6V < V
I
I
I
I
V
R
R
R
SW
SW
SW
BD
R
T
T
T
= 20mA
= 40.2kΩ
= 180kΩ
= 14.1kΩ
= 30V
= 0.9A
= 0.9A (Note 4)
= 0.9A
A
IN
= 25°C, V
< 36V
The
FB
> 0.8V
l
IN
denotes the specifi cations which apply over the full operating
= 12V, V
and correlation with statistical process controls. The LT3509I is guaranteed
over the full –40°C to 125°C temperature range.
Note 4. Switch Saturation Voltage is guaranteed by design.
Note 5. This IC includes over-temperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature will
exceed the maximum operating temperature when overtemperature protection
is active. Continuous operation above the specifi ed maximum operating
junction temperature may impair device reliability.
BD
= 5V. (Note 3)
l
l
l
l
l
0.784
MIN
1.05
0.92
237
0.4
0.7
0.7
2.0
37
38.5
0.01
0.95
0.01
0.32
TYP
264
3.3
1.9
0.8
0.6
1.4
1.5
0.7
0.1
1.0
2.2
90
22
80
9
1
0.816
MAX
1.08
500
290
150
3.6
2.2
0.8
1.3
1.9
1.2
1.0
2.2
0.9
2.5
40
15
36
LT3509
2
5
UNITS
MHz
MHz
3
%/V
3509f
kHz
mA
mA
μA
μA
nA
μA
μA
ns
V
V
V
V
V
A
A
V
V
V