LTC3418 Datasheet, PDF (3/20 Pages) Linear Technology – 8A, 4MHz, Monolithic Synchronous Step-Down Regulator

LTC3418
ELECTRICAL CHARACTERISTICS The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.3V. (Note 2)
SYMBOL
f_OSC
f_SYNC
R_PFET
R_NFET
I_LIMIT
V_UVLO
V_REF
I_LSW
V_RUN
PARAMETER
Switching Frequency
Switching Frequency Range
SYNC Capture Range
R_DS(ON) of P-Channel FET
R_DS(ON) of N-Channel FET
Peak Current Limit
Undervoltage Lockout Threshold
Reference Output
SW Leakage Current
RUN Threshold
CONDITIONS
R_OSC = 69.8kΩ
(Note 6)
(Note 6)
I_SW = 600mA
I_SW = – 600mA
V_RUN = 0V, V_IN = 5.5V
MIN
0.88
0.3
0.3
12
1.75
1.219
0.5
TYP
1
35
25
17
2
1.250
0.1
0.65
MAX
1.12
4
4
50
35
2.25
1.281
1
0.8
UNITS
MHz
MHz
MHz
mΩ
mΩ
A
V
V
µA
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3418 is guaranteed to meet performance specifications
from 0^oC to 70^oC. 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 LTC3418 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 P_D as follows:
LTC3418: T_J = T_A + (P_D)(34°C/W)
Note 6: This parameter is guaranteed by design and characterization.
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Internal Reference Voltage
vs Temperature
0.8000
V_IN = 3.3V
0.7995
0.7990
0.7985
0.7980
0.7975
0.7970
0.7965
0.7960
–40 –20
0 20 40 60 80 100 120
TEMPERATURE (°C)
3418 G07
Switch On-Resistance
vs Input Voltage
45
40
35
PFET
30
NFET
25
20
15
10
5
0
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3418 G01
On-Resistance vs Temperature
50
V_IN = 3.3V
45
40
PFET
35
30
NFET
25
20
15
10
5
0
–40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3418 G02
3418f
3