LTC3114-1
3
31141fb
For more information www.linear.com/LTC3114-1
elecTrical characTerisTics
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.
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage V
LDO
≥ 2.7V, –55°C to 0°C
V
LDO
≥ 2.7V, 0°C to 150°C
l
l
2.3
2.2
40
40
V
V
Output Operating Voltage (Note 5)
l
2.7 40 V
Undervoltage Lockout Threshold on LDO V
LDO
Rising
l
2.3 2.5 2.7 V
V
IN
Quiescent Current in Shutdown 3 µA
V
IN
Quiescent Current in Burst Mode Operation FB = 1.4V, Non-Bootstrapped (Note 6) 50 µA
Oscillator Frequency
l
1000 1200 1400 kHz
Oscillator Frequency Variation V
IN
= 12V to 36V 0.1 %/V
Feedback Voltage Measured on FB
l
0.98 1.0 1.02 V
Feedback Voltage Line Regulation V
IN
= 2.7V to 40V, Measured on FB 0.2 %
Error Amplifier Transconductance VC Current = ±5µA 120 µS
FB Pin Input Current FB = 1V 1 50 nA
VC Source Current VC = 0.6V –12 µA
VC Sink Current VC = 0.6V 12 µA
RUN Pin Threshold—Accurate RUN Pin Rising
l
1.185 1.205 1.29 V
RUN Pin Hysteresis 140 mV
Run Pin Threshold—Logic
l
0.3 0.7 1.1 V
PROG Current Switch D Current = 1A
Switch D Current = 500mA
Switch D Current = 100mA (Note 3)
38
18
2
40
20
4
42
22
6
µA
µA
µA
PROG Current Gain Ratio of PROG Current to SWD Current 40 µA/A
PROG V
oltage Threshold 0.90
0.925 0.95 V
Inductor Current Limit (Note 3)
l
1.3 1.7 2.3 A
Overload Current Limit V
OUT
= 0V (Note 3) 2.6 A
I
ZERO
Inductor Current Limit (Note 3) 100 mA
Maximum Duty Cycle Percentage of Period SW2 is Low in Boost Mode
Percentage of Period SW1 is High in Boost Mode
l
l
90
85
95
88
%
%
Minimum Duty Cycle Percentage of Period SW1 is High in Buck Mode
l
0 %
N-Channel Switch Resistance 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)
250
250
250
250
mΩ
mΩ
mΩ
mΩ
N-Channel Switch Leakage 0.1 10 µA
LDO Output Voltage I
LDO
= 10mA
l
4.2 4.4 4.6 V
LDO Load Regulation I
LDO
= 1mA to 10mA 0.8 %
LDO Line Regulation I
LDO
= 1mA, V
IN
= 10V to 40V 0.2 %
LDO Current Limit V
LDO
= 2.5V 40 65 mA
Soft-Start Time 2 ms
SW1 and SW2 Forced Low Time 100 ns
MODE Pin Logic Threshold H = PWM Mode, L = Burst Mode Operation
l
0.5 0.9 1.3 V
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
