Datasheet

LTC3407-3
3
34073fb
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. No pin shall exceed 6V.
Note 2: The LTC3407E-3 is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3407-3 is tested in a proprietary test mode that connects
the output of the error amplifi er to an outside servo loop.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient T
A
and power dissipation P
D
according to the following formula: T
J
= T
A
+ (P
D
• θ
JA
).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation Pulse-Skipping Mode Load Step
T
A
= 25°C unless otherwise specifi ed.
SW
5V/DIV
V
OUT
20mV/DIV
I
L
200mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
2μs/DIV
34073 G01
SW
5V/DIV
V
OUT
20mV/DIV
I
L
200mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 20mA
1μs/DIV
34073 G02
34073 G03
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 80mA TO 800mA
CIRCUIT OF FIGURE 1
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
LIM
Peak Switch Current Limit, Channel 1 +
Channel 2
V
IN
= 3V, V
OUT1
= 1.5V, V
OUT2
= 2.8V,
Duty Cycle <35%
0.95 1.2 1.6 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V, V
OUT1
= V
OUT2
= 0V 0.01 1 μA
POR Power-On Reset Threshold V
OUT
Ramping Down, MODE/SYNC = 0V –8.5 %
Power-On Reset On-Resistance 100 200 Ω
Power-On Reset Delay 262,144 Cycles
V
RUN
RUN Threshold
●
0.3 1 1.5 V
I
RUN
RUN Leakage Current
●
0.01 1 μA
V
MODE
MODE Threshold Low 0 0.5 V
MODE Threshold High V
IN
– 0.5 V
IN
V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specifi ed. (Note 2)