lt3686a Linear Technology Corporation, lt3686a Datasheet - Page 3

• Manufacturer Part Number: lt3686a
• Description: 37v/1.2a Step-down Regulator In 3mm
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Quiescent Current at Shutdown
Quiescent Current
Internal Undervoltage Lockout
Overvoltage Lockout
Feedback Voltage
FB Pin Bias Current
Switching Frequency
Minimum On Time
Minimum Off Time
Switch V
Switch Current Limit
Switch Active Current
BOOST Pin Current
Minimum Boost Voltage Above Switch
Max BD Pin Active Load Current
BD Pin Voltage to Disable Active Load
DA Pin Current to Stop OSC
SYNC/MODE High
SYNC/MODE Low
SYNC/MODE Bias Current
SS Threshold
SS Source Current
EN/UVLO Bias Current
EN/UVLO Threshold
EN/UVLO Hysteresis Current
Boost Diode Forward Drop
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: The LT3686AE 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 and correlation with statistical process controls. The
LT3686AI is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3686AH is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes; operating lifetime is derated for junction
temperatures greater than 125°C.
CESAT
CONDITIONS
V
V
Not Switching, SYNC/MODE ≤ 0.4V
Not Switching, SYNC/MODE ≥ 0.8V
V
I
R
Mode > 0.8V, BD < 6V
I
(Note 3)
SW = 10V (Note 4)
SW = 0V (Note 5)
I
I
Mode > 0.8V, BD < 6V
V
V
V
I
DA
SW
SW
SW
BD
EN/UVLO
EN/UVLO
IN
T
SS
EN/UVLO
EN/UVLO
= 15.4kΩ
< 1.2A
to I
= 3.6V ↔ 37V
= 1.2A
= 1.2A
= 1.2A
A
= 1V
= 25°C. V
BOOST
< 0.4V
= 1V
= 10V
= 0V
The
= 200mA
●
IN
denotes the specifi cations which apply over the full operating
= 10V, V
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4: Current fl ows into pin.
Note 5: Current fl ows out of pin.
Note 6: This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature will
exceed the maximum operating junction temperature when overtemperature
protection is active. Continuous operation above the specifi ed maximum
operating junction temperature may impair device reliability. See High
Temperature Considerations section.
Note 7: Absolute Maximum Voltage at V
nonrepetitive one second transients, and 55V for continuous operation.
EN/UVLO
≥ 1.34V.
●
●
●
●
●
●
●
●
0.790
0.785
1.85
1.22
MIN
0.3
1.9
1.9
1.2
0.8
1.3
1.8
37
30
6
IN
and EN/UVLO pins is 60V for
0.85
TYP
1.28
100
680
400
150
1.2
3.4
0.8
0.8
2.3
2.3
2.2
6.5
0.9
2.4
0.1
1.1
2.1
1.7
10
38
60
20
20
40
2
LT3686A
0.810
0.815
MAX
2.65
1.34
100
200
600
110
1.3
1.4
3.6
2.5
2.3
2.6
2.4
0.4
0.2
2.7
15
39
30
40
1
7
1
3
UNITS
3686af
3
MHz
MHz
mA
mA
mV
mA
mA
μA
μA
nA
μA
μA
μA
μA
μA
μA
μA
ns
ns
V
V
V
V
A
A
V
V
A
V
V
V
V
V