LTC3534
3
3534fb
For more information www.linear.com/LTC3534
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 LTC3534E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage
l
2.2 2.4 V
Input Operating Range
l
2.4 7 V
Output Voltage Adjust Range
l
1.8 7 V
Feedback Voltage (Note 4)
l
0.975 1 1.015 V
Feedback Input Current V
FB
= Measured Feedback Voltage (Note 4) 1 50 nA
V
IN
Quiescent Current – Burst Mode
Operation
V
FB
= 1.2V, V
PWM
= 0V (Note 5) 25 50 µA
V
IN
Quiescent Current – Shutdown V
RUN/SS
= 0V, Not Including Switch Leakage, V
OUT
= 0V 0.1 1 µA
V
IN
Quiescent Current – Active V
FB
= 1.2V, V
PWM
= 5V (Note 5) 420 700 µA
Input Current Limit V
PWM
= 5V
l
1 1.8 A
Reverse Current Limit V
PWM
= 5V 500 mA
Burst Current Limit V
PWM
= 0V 400 mA
NMOS Switches Leakage Switches B and C 0.1 7 µA
PMOS Switches Leakage Switches A and D 0.1 10 µA
PMOS Switches On-Resistance Switches A and D 260 mΩ
NMOS B Switch On-Resistance Switch B 275 mΩ
NMOS C Switch On-Resistance Switch C 215 mΩ
Maximum Duty Cycle Boost (% Switch C On)
Buck (% Switch A On)
l
l
75
100
85 %
%
Minimum Duty Cycle
l
0 %
Frequency
l
0.80 1 1.15 MHz
Error Amp AV
OL
(Note 4) 74 dB
Error Amp Source Current –15 µA
Error Amp Sink Current 225 µA
RUN/SS Threshold
l
0.4 1 1.4 V
RUN/SS Input Current – Shutdown V
RUN/SS
= 400mV; IC is Shut Down 0.02 1 µA
RUN/SS Input Current – Active V
RUN/SS
= 5V; IC is Enabled 0.28 1 µA
PWM Threshold Measured at PWM Pin; Voltage at which Burst Mode Operation is
Disabled (PWMing Enabled)
0.4 1 1.4 V
PWM Input Current V
PWM
= 5V 1.25 2.5 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 5V, unless otherwise noted.
Note 3: 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 4: The IC is tested in a feedback loop to make this measurement.
Note 5: Current Measurements are performed when the outputs are not
switching.
