LTC3114-1_15 Datasheet, PDF (4/34 Pages) Linear Technology – 40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current

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
for 12V V_IN to 5V V_OUT is 30µA, if boostrapped.
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
5V Output Efficiency vs Load
95
90
85
80
75
70
65
60
55
50
45
40
0.001
0.01
V_IN = 3.6V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.1
1
LOAD CURRENT (A)
31141 G01
24V Output Efficiency
vs Load
95
90
85
80
75
70
65
60
0.0001
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.001
0.01
0.1
1
LOAD CURRENT (A)
31141 G04
4
12V Output Efficiency vs Load
95
90
85
80
75
70
65
60
55
50
45
40
0.001
0.01
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.1
1
LOAD CURRENT (A)
31141 G02
Maximum Load Current vs V_IN
1.35
1.25
1.15
1.05
0.95
0.85
0.75
0.65
0.55
0.45
0.35
0.25
0.15
0.05
1
V_OUT = 5V
V_OUT = 12V
V_OUT = 24V
10
40
INPUT VOLTAGE (V)
31141 G05
For more information www.linear.com/LTC3114-1
12V Output Efficiency vs V_IN
95
I_LOAD = 200mA
I_LOAD = 400mA
90
I_LOAD = 600mA
I_LOAD = 1A
85
80
75
70
1
10
INPUT VOLTAGE (V)
40
31141 G03
No-Load Input Current
vs V_IN, Burst Mode Enabled
160
140
120
100
80
60
40
20
1
V_OUT = 5V
V_OUT = 12V
10
INPUT VOLTAGE (V)
40
31141 G06
31141fa