Datasheet

LTC3419
3
3419fa
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: Guaranteed by long term current density limitations.
Note 3: The LTC3419E and LTC3419E-1 are guaranteed to meet specifi ed
performance from 0°C to 85°C. Specifi cations over the –40°C to 125°C
operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3419I and LTC3419I-1 are guaranteed to meet specifi ed performance
over the full –40°C to 125°C operating junction temperature range.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN
Operating Voltage
●
2.5 5.5 V
V
UV
V
IN
Undervoltage Lockout V
IN
Low to High
●
2.1 2.5 V
I
FB
Feedback Pin Input Current LTC3419
LTC3419-1
●
●
3
±30
5
nA
μA
V
FBREG1
Regulated Feedback Voltage (Channel 1) LTC3419E, 0°C < T
J
< 85°C
LTC3419E, –40°C < T
J
< 85°C
LTC3419E-1, –40°C < T
J
< 85°C
LTC3419I, –40°C < T
J
< 125°C
LTC3419I-1, –40°C < T
J
< 125°C
●
●
●
●
0.590
0.588
1.544
0.582
1.533
0.600
0.600
1.575
0.6
1.575
0.610
0.612
1.606
0.618
1.617
V
V
V
V
V
V
FBREG2
Regulated Feedback Voltage (Channel 2) LTC3419E, 0°C < T
J
< 85°C
LTC3419E, –40°C < T
J
< 85°C
LTC3419E-1, –40°C < T
J
< 85°C
LTC3419I, –40°C < T
J
< 125°C
LTC3419I-1, –40°C < T
J
< 125°C
●
●
●
●
0.590
0.588
1.764
0.582
1.753
0.600
0.600
1.8
0.6
1.8
0.610
0.612
1.836
0.618
1.847
V
V
V
V
V
ΔV
LINE REG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 7) 0.3 0.5 %/V
ΔV
LOAD REG
Output Voltage Load Regulation I
LOAD
= 0mA to 600mA (Note 7) 0.5 %
I
S
Input DC Supply Current
Active Mode (Note 4)
Sleep Mode
Shutdown
V
FB1
= V
FB2
= 0.95 × V
FBREG
V
FB1
= V
FB2
= 1.05 × V
FBREG
, V
IN
= 5.5V
RUN1 = RUN2 = 0V, V
IN
= 5.5V
500
35
0.1
700
60
1
μA
μA
μA
f
OSC
Oscillator Frequency V
FB
= V
FBREG
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current Limit
Channel 1 (600mA)
Channel 2 (600mA)
V
IN
= 3V, V
FB
< V
FBREG
, Duty Cycle < 35%
900
900
1200
1200
mA
mA
R
DS(ON)
Channel 1 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
V
IN
= 3.6V, I
SW
= 100mA
0.4
0.4
0.4
0.4
0.6
0.6
0.6
0.6
Ω
Ω
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V 0.01 1 μA
t
SOFTSTART
Soft-Start Time V
FB
from 10% to 90% Full Scale 0.1 0.95 1.3 ms
V
RUN
RUN Threshold High
●
0.4 1 1.2 V
I
RUN
RUN Leakage Current
●
0.01 1 μA
V
MODE
MODE Threshold High
●
0.4 1 1.2 V
I
MODE
MODE Leakage Current
●
0.01 1 μA
V
BURST
Output Ripple in Burst Mode Operation V
OUT
= 1.5V, C
OUT
= 10μF 20 mV
P-P
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 3.6V, unless otherwise noted.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
Note 6: 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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 7: The converter is tested in a proprietary test mode that connects
the output of the error amplifi er to the SW pin, which is connected to an
external servo loop.