LTC3407A-2
3
3407a2f
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specified. (Note 2)
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 LTC3407AE-2 is guaranteed to meet specified performance
from 0°C to 85°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3407AI-2 is guaranteed over the
full –40°C to 125°C operating temperature range.
Note 3: The LTC3407A-2 is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifier.
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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range ● 2.5 5.5 V
I
FB
Feedback Pin Input Current ● 30 nA
V
FB
Feedback Voltage (Note 3) 0°C ≤ T
A
≤ 85°C 0.588 0.6 0.612 V
–40°C ≤ T
A
≤ 125°C (Note 2) ● 0.585 0.6 0.612 V
ΔV
LINE REG
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 3) 0.3 0.5 %/V
ΔV
LOAD REG
Output Voltage Load Regulation MODE/SYNC = 0V (Note 3) 0.5 %
I
S
Input DC Supply Current (Note 4)
Active Mode V
FB1
= V
FB2
= 0.5V 700 950 μA
Sleep Mode V
FB1
= V
FB2
= 0.63V, MODE/SYNC = 3.6V 40 60 μA
Shutdown RUN = 0V, V
IN
= 5.5V, MODE/SYNC = 0V 0.1 1 μA
f
OSC
Oscillator Frequency V
FBX
= 0.6V ● 1.8 2.25 2.7 MHz
f
SYNC
Synchronization Frequency 2.25 MHz
I
LIM
Peak Switch Current Limit V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle <35% 1 1.2 1.6 A
R
DS(ON)
Top Switch On-Resistance (Note 6) 0.35 0.45 Ω
Bottom Switch On-Resistance (Note 6) 0.30 0.45 Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V, V
FBX
= 0V 0.01 1 μA
POR Power-On Reset Threshold V
FBX
Ramping Up, MODE/SYNC = 0V 8.5 %
V
FBX
Ramping Down, MODE/SYNC = 0V –8.5 %
Power-On Reset On-Resistance 100 200 Ω
Power-On Reset Delay 65,536 Cycles
V
RUN
RUN/SS Threshold Low ● 0.3 1 1.5 V
RUN/SS Threshold High
● 2V
I
RUN
RUN/SS 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
