Datasheet

LTC3407A
3
3407afa
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 LTC3407AE is guaranteed to meet specifi ed performance
from 0°C to 85°C. Specifi cations over the –40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3407AI is guaranteed over the full
–40°C to 125°C temperature range.
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)
Note 3: The LTC3407A is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifi er.
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
ΔV
LOAD REG
Output Voltage Load Regulation MODE/SYNC = 0V (Note 3) 0.5 %
I
S
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
(Note 4)
V
FB1
= V
FB2
= 0.5V
V
FB1
= V
FB2
= 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V
IN
= 5.5V, MODE/SYNC = 0V
600
40
0.1
800
60
1
µA
µA
µA
f
OSC
Oscillator Frequency V
FBX
= 0.6V
●
1.2 1.5 1.8 MHz
f
SYNC
Synchronization Frequency 1.5 MHz
I
LIM
Peak Switch Current Limit V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle <35% 0.75 1 1.25 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45


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
V
FBX
Ramping Down, MODE/SYNC = 0V
8.5
–8.5
%
%
Power-On Reset On-Resistance 100 200 
Power-On Reset Delay 65,536 Cycles
V
RUN
RUN/SS Threshold Low
RUN/SS Threshold High
●
●
0.3 1 1.5
2
V
V
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
Burst Mode Operation
Pulse Skipping Mode
3407 G01
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 3
SW
5V/DIV
V
OUT
50mV/DIV
I
L
200mA/DIV
2µs/DIV
3407 G02
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 3
SW
5V/DIV
V
OUT
10mV/DIV
I
L
100mA/DIV
1µs/DIV
TYPICAL PERFORMANCE CHARACTERISTICS