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LTM4612
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified internal
operating temperature range, otherwise specifications are at T A = 25°C, V IN = 24V, unless otherwise noted (Note 2). Per Typical
Application (front page) configuration.
SYMBOL
I Q(VIN)
I S(VIN)
V INTVCC
PARAMETER
Input Supply Bias Current
Input Supply Current
Internal V CC Voltage
CONDITIONS
V IN = 36V, V OUT = 12V, Switching Continuous
V IN = 24V, V OUT = 12V, Switching Continuous
Shutdown, RUN = 0, V IN = 36V
V IN = 36V, V OUT = 12V, I OUT = 5A
V IN = 24V, V OUT = 12V, I OUT = 5A
V IN = 36V, RUN > 2V, I OUT = 0A
MIN
4.7
TYP
57
48
50
1.85
2.72
5
MAX
5.3
UNITS
mA
mA
μA
A
A
V
Output Specification s
I OUT(DC)
Output Continuous Current Range
V IN = 24V, V OUT = 12V (Note 4)
0
5
A
D V OUT(LINE)
V OUT
D V OUT(LOAD )
V OUT
V IN(AC)
V OUT(AC)
f S
D V OUT(START)
t START
D V OUT(LS)
Line Regulation Accuracy
Load Regulation Accuracy
Input Ripple Voltage
Output Ripple Voltage
Output Ripple Voltage Frequency
Turn-On Overshoot,
TRACK/SS = 10nF
Turn-On Time, TRACK/SS = Open
Peak Deviation for Dynamic Load
V OUT = 12V, FCB = 0V, V IN = 22V to 36V,
I OUT = 0A
V OUT = 12V, FCB = 0V, I OUT = 0A to 5A (Note 4)
V IN = 36V
V IN = 24V
I OUT = 0A,
C IN = 2 × 10μF X5R Ceramic and 1 × 100μF
Electrolytic, 1 × 10μF X5R Ceramic on V D Pins
V IN = 24V, V OUT = 5V
V IN = 24V, V OUT = 12V
I OUT = 0A,
C OUT = 2 × 22μF, 2 × 47μF X5R Ceramic
V IN = 24V, V OUT = 5V
V IN = 24V, V OUT = 12V
I OUT = 1A, V IN = 24V, V OUT = 12V
C OUT = 200μF, V OUT = 12V, I OUT = 0A
V IN = 36V
V IN = 24V
C OUT = 300μF, V OUT = 12V, I OUT = 1A
Resistive Load
V IN = 36V
V IN = 24V
Load: 0% to 50% to 0% of Full Load
C OUT = 2 × 22μF Ceramic, 150μF Bulk
V IN = 24V, V OUT = 12V
l
l
l
0.05
0.3
0.3
7.2
3.4
17.5
12.5
940
20
20
0.5
0.5
153
0.3
0.6
0.6
%
%
%
mV P-P
mV P-P
mV P-P
mV P-P
kHz
mV
mV
ms
ms
mV
t SETTLE
Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, V IN = 24V
37
μs
I OUT(PK)
Output Current Limit
C OUT = 200μF
V IN = 36V, V OUT = 12V
V IN = 24V, V OUT = 12V
9
9
A
A
Control Section
V FB
V RUN
I SS / TRACK
Voltage at V FB Pin
RUN Pin On/Off Threshold
Soft-Start Charging Current
I OUT = 0A, V OUT = 12V
V SS/TRACK = 0V
l
0.591
1
–1
0.6
1.5
–1.5
0.609
1.9
–2
V
V
μA
V FCB
I FCB
t ON(MIN)
t OFF(MIN)
R PLLIN
Forced Continuous Threshold
Forced Continuous Pin Current
Minimum On-Time
Minimum Off-Time
PLLIN Input Resistor
V FCB = 0V
(Note 3)
(Note 3)
0.57
0.6
–1
50
250
50
0.63
–2
100
400
V
μA
ns
ns
k W
4612fb
3
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