Datasheet

LTC3418
3
3418fb
ELECTRICAL CHARACTERISTICS
The l denotes the speci cations which apply over the full operating
temperature range, otherwise speci cations are at T
A
= 25°C. V
IN
= 3.3V. (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 LTC3418 is guaranteed to meet performance specifi cations
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 LTC3418 is tested in a feedback loop that adjusts V
FB
to
achieve a specifi ed error amplifi er 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 P
D
as follows:
LTC3418: T
J
= T
A
+ (P
D
)(34°C/W)
Note 6: This parameter is guaranteed by design and characterization.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
TRACK
TRACK Input Current 100 200 nA
ΔV
PGOOD
Power Good Range ±7.5 ±9 %
R
PGOOD
Power Good Resistance 100 150 Ω
I
Q
Input DC Bias Current
Active Current
Shutdown
(Note 4)
V
FB
= 0.7V, V
ITH
= 1V
V
RUN
= 0V
380
0.03
450
1.5
μA
μA
f
OSC
Switching Frequency
Switching Frequency Range
R
OSC
= 69.8kΩ
(Note 6)
0.88
0.3
11.12
4
MHz
MHz
f
SYNC
SYNC Capture Range (Note 6) 0.3 4 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 600mA 35 50
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –600mA 25 35
I
LIMIT
Peak Current Limit 12 17 A
V
UVLO
Undervoltage Lockout Threshold 1.75 2 2.25 V
V
REF
Reference Output 1.219 1.250 1.281 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
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
Switch On-Resistance
vs Input Voltage
INPUT VOLTAGE (V)
2.25
0
ON-RESISTANCE (mΩ)
5
15
20
25
4.25
45
3418 G02
10
3.25
2.75
4.75
3.75 5.25
30
PFET
NFET
35
40
On-Resistance vs Temperature
TEMPERATURE (°C)
–40
0
ON-RESISTANCE (mΩ)
5
15
20
25
50
35
0
40
60
3418 G03
10
40
45
30
PFET
NFET
–20 20
80
100
120
V
IN
= 3.3V
TEMPERATURE (°C)
–40 –20
REFERENCE VOLTAGE (V)
0.7980
0.7990
120
3418 G01
0.7970
0.7960
020
40 60
10080
0.8000
0.7975
0.7985
0.7965
0.7995
V
IN
= 3.3V
Internal Reference Voltage
vs Temperature