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LTM4608
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature rang e (Note 2), otherwise specifications are at T A = 25°C. V IN = 5V unless otherwise n oted. Se e Figure 1 .
SYMBOL
I Q(VIN)
PARAMETER
Input Supply Bias Current
CONDITIONS
V IN = 3.3V, V OUT = 1.5V, No Switching, MODE = V IN
V IN = 3.3V, V OUT = 1.5V, No Switching, MODE = 0V
V IN = 3.3V, V OUT = 1.5V, Switching Continuous
MIN
TYP
400
1.15
55
MAX
UNITS
μA
mA
mA
V IN = 5V, V OUT = 1.5V, No Switching, MODE = V IN
V IN = 5V, V OUT = 1.5V, No Switching, MODE = 0V
V IN = 5V, V OUT = 1.5V, Switching Continuous
Shutdown, RUN = 0, V IN = 5V
450
1.3
75
1
μA
mA
mA
μA
I S(VIN)
Input Supply Current
V IN = 3.3V, V OUT = 1.5V, I OUT = 8A
V IN = 5V, V OUT = 1.5V, I OUT = 8A
4.5
2.93
A
A
Output Specification s
I OUT(DC)
Output Continuous Current Range V OUT = 1.5V
(See Output Current Derating V IN = 3.3V, 5.5V
Curves for Different V IN , V OUT V IN = 2.7V
and T A )
0
0
8
5
A
A
ΔV OUT(LINE)
Line Regulation Accuracy
V OUT = 1.5V, V IN from 2.7V to 5.5V, I OUT = 0A
l
0.1
0.2
%/V
V OUT
ΔV OUT(LOAD)
V OUT
V OUT(AC)
f S
Load Regulation Accuracy
Output Ripple Voltage
Switching Frequency
V OUT = 1.5V
V IN = 3.3V, 5.5V, I LOAD = 0A to 8A
V IN = 2.7V, I LOAD = 0A to 5A
I OUT = 0A, C OUT = 100μF/X5R/Ceramic, V IN = 5V,
V OUT = 1.5V
I OUT = 8A, V IN = 5V, V OUT = 1.5V
l
l
1.3
0.3
0.3
10
1.5
0.75
0.75
1.7
%
%
mV P-P
MHz
f SYNC
ΔV OUT(START)
t START
SYNC Capture Range
Turn-On Overshoot
Turn-On Time
C OUT = 100μF, V OUT = 1.5V, I OUT = 0A
V IN = 3.3V
V IN = 5V
C OUT = 100μF, V OUT = 1.5V, V IN = 5V
I OUT =1A Resistive Load, Track = V IN
0.75
10
10
100
2.25
MHz
mV
mV
μs
ΔV OUT(LS)
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load,
C OUT = 100μF Ceramic, 100μF POSCAP,
V IN = 5V, V OUT = 1.5V
15
mV
t SETTLE
I OUT(PK)
Settling Time for Dynamic Load
Step
Output Current Limit
Load: 0% to 50% to 0% of Full Load, V IN = 5V,
V OUT = 1.5V, C OUT = 100μF
C OUT = 100μF
V IN = 2.7V, V OUT = 1.5V
V IN = 3.3V, V OUT = 1.5V
V IN = 5V, V OUT = 1.5V
10
8
11
13
μs
A
A
A
Control Section
V FB
Voltage at FB Pin
I OUT = 0A, V OUT = 1.5V, V IN = 2.7V to 5.5V
l
0.592
0.589
0.596
0.596
0.600
0.603
V
V
SS Delay
I FB
Internal Soft-Start Delay
90
0.2
μs
μA
V RUN
RUN Pin On/Off Threshold
RUN Rising
RUN Falling
1.4
1.3
1.55
1.4
1.7
1.5
V
V
4608fd
3
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