LTC3412
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
= 309kΩ
MIN
TYP
MAX
UNITS
f
Switching Frequency
Switching Frequency Range
R
0.88
0.3
0.95
1.1
4
MHz
MHz
OSC
OSC
(Note 6)
f
SYNC Capture Range
(Note 6)
0.3
4
MHz
mΩ
mΩ
A
SYNC
R
R
R
R
of P-Channel FET
of N-Channel FET
I
I
= 1A (Note 7)
85
65
110
90
PFET
NFET
DS(ON)
DS(ON)
SW
SW
= –1A (Note 7)
I
Peak Current Limit
4
5.4
LIMIT
V
Undervoltage Lockout Threshold
SW Leakage Current
RUN Threshold
2.375
2.500
0.1
2.625
1
V
UVLO
LSW
I
V
= 0V, V = 5.5V
μA
V
RUN
IN
V
0.5
0.65
0.8
1
RUN
RUN
I
RUN/SS Leakage Current
μA
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 3: The LTC3412 is tested in a feedback loop that adjusts V to
FB
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 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. The LTC3412I is guaranteed to meet
specified performance over the –40°C to 85°C temperature range.
Note 5: T is calculated from the ambient temperature T and power
J
A
dissipation as follows: LTC3412: T = T + P (37.6°C/W).
J
A
D
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.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Load Current
100
80
60
40
20
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
V
= 3.3V
V
= 5V
IN
IN
V
= 3.3V
V
= 5V
IN
IN
Burst Mode OPERATION
FORCED CONTINUOUS
V
= 2.5V
V
= 2.5V
OUT
1MHz
Burst Mode OPERATION
OUT
1MHz
V
V
= 3.3V
IN
OUT
= 2.5V
FORCED CONTINUOUS
0.1 10
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
0.001 0.01 0.1
LOAD CURRENT (A)
1
10
0.001
0.01
1
LOAD CURRENT (A)
3412 G01
3412 G02
3412 G03
3412fb
3
Linear [ Linear ]
