Datasheet
LTC3412
3
3412fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Load CurrentEfficiency vs Load Current Efficiency vs Load Current
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
100
80
60
40
20
0
10
3412 G01
V
IN
= 3.3V
V
OUT
= 2.5V
Burst Mode OPERATION
FORCED CONTINUOUS
0.1 10.01
100
90
80
70
60
50
40
30
20
10
0
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
10
3412 G02
V
OUT
= 2.5V
1MHz
Burst Mode OPERATION
0.1 10.01
V
IN
= 3.3V V
IN
= 5V
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
10
3412 G03
V
OUT
= 2.5V
1MHz
FORCED CONTINUOUS
0.1 10.01
V
IN
= 3.3V V
IN
= 5V
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
OSC
Switching Frequency R
OSC
= 309kΩ 0.88 0.95 1.1 MHz
Switching Frequency Range (Note 6) 0.3 4 MHz
f
SYNC
SYNC Capture Range (Note 6) 0.3 4 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 1A (Note 7) 85 110 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –1A (Note 7) 65 90 mΩ
I
LIMIT
Peak Current Limit 4 5.4 A
V
UVLO
Undervoltage Lockout Threshold 2.375 2.500 2.625 V
I
LSW
SW Leakage Current V
RUN
= 0V, V
IN
= 5.5V 0.1 1 µA
V
RUN
RUN Threshold 0.5 0.65 0.8 V
I
RUN
RUN/SS Leakage Current 1 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3412E 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.
Note 3: The LTC3412 is tested in a feedback loop that adjusts V
FB
to
achieve a specified error amplifier output voltage (I
TH
).
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 temperature T
A
and power
dissipation as follows: LTC3412: T
J
= T
A
+ P
D
(37.6°C/W).
Note 6: 4MHz operation is guaranteed by design and not production tested.
Note 7: Switch on resistance is guaranteed by design and test correlation
in the UF package and by production test in the FE package.