Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
31141fb
2
For more information
www.linear.com/LTC3114-1
LTC3114-1
elecTrical characTerisTics
PARAMETER
V
IN
Operating Voltage
Output Operating Voltage
Undervoltage Lockout Threshold on LDO
V
IN
Quiescent Current in Shutdown
V
IN
Quiescent Current in Burst Mode Operation
Oscillator Frequency
Oscillator Frequency Variation
Feedback Voltage
Feedback Voltage Line Regulation
Error Amplifier Transconductance
FB Pin Input Current
VC Source Current
VC Sink Current
RUN Pin Threshold—Accurate
RUN Pin Hysteresis
Run Pin Threshold—Logic
PROG Current
Switch D Current = 1A
Switch D Current = 500mA
Switch D Current = 100mA (Note 3)
Ratio of PROG Current to SWD Current
0.90
(Note 3)
V
OUT
= 0V (Note 3)
(Note 3)
Percentage of Period SW2 is Low in Boost Mode
Percentage of Period SW1 is High in Boost Mode
Percentage of Period SW1 is High in Buck Mode
Switch A (from PV
IN
to SW1)
Switch B (from SW1 to PGND)
Switch C (from SW2 to PGND)
Switch D (from PV
OUT
to SW2)
I
LDO
= 10mA
I
LDO
= 1mA to 10mA
I
LDO
= 1mA, V
IN
= 10V to 40V
V
LDO
= 2.5V
40
l
l
l
l
l
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 24V, V
OUT
= 5V, unless otherwise noted.
CONDITIONS
V
LDO
≥ 2.7V, –55°C to 0°C
V
LDO
≥ 2.7V, 0°C to 150°C
(Note 5)
V
LDO
Rising
FB = 1.4V, Non-Bootstrapped (Note 6)
l
l
l
l
l
MIN
2.3
2.2
2.7
2.3
TYP
MAX
40
40
40
UNITS
V
V
V
V
µA
µA
2.5
3
50
2.7
1000
0.98
1200
0.1
1.0
0.2
120
1
–12
12
1400
1.02
kHz
%/V
V
%
µS
V
IN
= 12V to 36V
Measured on FB
V
IN
= 2.7V to 40V, Measured on FB
VC Current = ±5µA
FB = 1V
VC = 0.6V
VC = 0.6V
RUN Pin Rising
l
l
50
nA
µA
µA
1.185
0.3
38
18
2
1.205
140
0.7
40
20
4
40
0.925
1.7
2.6
100
1.29
1.1
42
22
6
0.95
2.3
V
mV
V
µA
µA
µA
µA/A
V
A
A
mA
%
%
PROG Current Gain
PROG Voltage Threshold
Inductor Current Limit
Overload Current Limit
I
ZERO
Inductor Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
N-Channel Switch Resistance
1.3
90
85
95
88
0
250
250
250
250
0.1
10
4.6
%
mΩ
mΩ
mΩ
mΩ
µA
V
%
%
mA
ms
ns
N-Channel Switch Leakage
LDO Output Voltage
LDO Load Regulation
LDO Line Regulation
LDO Current Limit
Soft-Start Time
SW1 and SW2 Forced Low Time
MODE Pin Logic Threshold
H = PWM Mode, L = Burst Mode Operation
l
4.2
4.4
0.8
0.2
65
2
100
0.5
0.9
1.3
V
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 LTC3114-1 is tested under pulsed load conditions such that
T
J
≈T
A
. The LTC3114E-1 is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3114I-1 specifications are guaranteed over the –40°C to 125°C
31141fb
For more information
www.linear.com/LTC3114-1
3
LTC3114-1
elecTrical characTerisTics
operating junction temperature range. The LTC3114H-1 specifications are
guaranteed over the –40°C to 150°C operating junction temperature range.
The LTC3114MP-1 specifications are guaranteed over the –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetime; operating lifetime is derated for junction temperatures
greater than 125°C. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
The junction temperature (T
J
in degrees Celsius) is calculated from the
ambient temperature (T
A
in degrees Celsius) and the power dissipation
(P
D
in Watts) according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
is the thermal impedance of the package.
Note 3:
Current measurements are performed when the LTC3114-1 is
not switching. The current limit values measured in operation will be
somewhat higher due to the propagation delay of the comparators. The
LTC3114-1 is tested in a proprietary non-switching test mode.
Note 4:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5:
Operating output voltage can be programmed as low as 1.0V
nominal if the accurate programmable output current limit feature is not
required.
Note 6:
Connecting LDO/PLDO to the regulated 5V output (bootstrapping),
reduces quiescent current substantially. Typical no-load quiescent current
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