LTC3114-1_15 Datasheet, PDF (3/34 Pages) Linear Technology – 40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current

LTC3114-1
ELECTRICAL CHARACTERISTICS 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
Output Operating Voltage
V_LDO ≥ 2.7V
(Note 5)
l 2.2
l 2.7
40
V
40
V
Undervoltage Lockout Threshold on LDO
V_IN Quiescent Current in Shutdown
V_IN Quiescent Current in Burst Mode Operation
Oscillator Frequency
V_LDO Rising
FB = 1.4V, Non-Bootstrapped (Note 6)
l 2.3
2.5
2.7
V
3
µA
50
µA
l 1000 1200 1400
kHz
Oscillator Frequency Variation
Feedback Voltage
V_IN = 12V to 36V
Measured on FB
0.1
%/V
l 0.98
1.0
1.02
V
Feedback Voltage Line Regulation
Error Amplifier Transconductance
V_IN = 2.7V to 40V, Measured on FB
VC Current = ±5µA
0.2
%
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
40
42
µA
18
20
22
µA
2
4
6
µA
PROG Current Gain
Ratio of PROG Current to SWD Current
40
µA/A
PROG Voltage Threshold
0.90 0.925 0.95
V
Inductor Current Limit
(Note 3)
l 1.3
1.7
2.3
A
Overload Current Limit
I_ZERO Inductor Current Limit
Maximum Duty Cycle
V_OUT = 0V (Note 3)
(Note 3)
2.6
A
100
mA
Percentage of Period SW2 is Low in Boost Mode l 90
95
%
Percentage of Period SW1 is High in Boost Mode l 85
88
%
Minimum Duty Cycle
Percentage of Period SW1 is High in Buck Mode l
0
%
N-Channel Switch Resistance
N-Channel Switch Leakage
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
mΩ
250
mΩ
250
mΩ
250
mΩ
0.1
10
µA
LDO Output Voltage
LDO Load Regulation
LDO Line Regulation
LDO Current Limit
Soft-Start Time
I_LDO = 10mA
I_LDO = 1mA to 10mA
I_LDO = 1mA, V_IN = 10V to 40V
V_LDO = 2.5V
l 4.2
4.4
4.6
V
0.8
%
0.2
%
40
65
mA
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 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
For more information www.linear.com/LTC3114-1
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