Datasheet

LTC3127
3
3127f
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.
Note 2: The LTC3127 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. Note that the maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Operating Range
l
1.8 5.5 V
Output Voltage Adjust
l
1.8 5.25 V
Feedback Voltage
l
1.165 1.195 1.225 V
Feedback Input Current V
FB
= 1.25V 1 50 nA
Quiescent Current—Burst Mode Operation V
FB
> 1.225, V
MODE
= V
IN
(Note 4) 35 µA
Quiescent Current—Shutdown V
SHDN
= 0V, Including SW Leakage 0.1 4 µA
Quiescent Current—Active V
FB
> 1.225V, V
MODE
= 0V (Note 4) 400 µA
Input Current Limit R
PROG
= 32.4k (Note 3) 480 500 520 mA
0°C to 85°C (Note 3)
l
465 500 540 mA
–40°C to 85°C (Note 3)
l
430 500 540 mA
Peak Current Limit
l
2 2.5 A
Reverse-Current Limit 0.15 0.3 0.45 A
P-Channel MOSFET Leakage Switches A and D 0.1 4 µA
N-Channel MOSFET On-Resistance Switch B
Switch C
140
170
mΩ
mΩ
P-Channel MOSFET On-Resistance Switch A
Switch D
160
190
mΩ
mΩ
Maximum Duty Cycle Boost( % Switch C On)
Buck (% Switch A On)
l
l
80
100
90 %
%
Minimum Duty Cycle
l
0 %
Frequency Accuracy
l
1 1.35 1.7 MHz
SHDN
Input High Voltage
l
1.2 V
SHDN Input Low Voltage
l
0.3 V
SHDN Input Current V
SHDN
= 5.5V 0.01 1 µA
MODE Input High Voltage
l
1.2 V
MODE Input Low Voltage
l
0.3 V
MODE Input Current V
MODE
= 5.5V 0.01 1 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 3.6V, V
OUT
= 3.3V, unless otherwise noted.
Note 3: Specification is guaranteed when the inductor current is in
continuous conduction.
Note 4: Current measurements are made when the output is not
switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
40°C/W.