LTM4612 Ver la hoja de datos (PDF) - Linear Technology
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LTM4612 Datasheet PDF : 24 Pages
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LTM4612
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, unless otherwise noted. Per Typical Application
(front page) configuration.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IQ(VIN)
Input Supply Bias Current
IS(VIN)
Input Supply Current
VINTVCC
Internal VCC Voltage
Output Specifications
VIN = 36V, No Switching
VIN = 36V, VOUT = 12V, Switching Continuous
VIN = 24V, No Switching
VIN = 24V, VOUT = 12V, Switching Continuous
Shutdown, RUN = 0, VIN = 36V
VIN = 36V, VOUT = 12V, IOUT = 5A
VIN = 24V, VOUT = 12V, IOUT = 5A
VIN = 36V, RUN > 2V, IOUT = 0A
4.5
mA
57
mA
3.5
mA
48
mA
50
μA
1.85
A
2.72
A
4.7
5
5.3
V
IOUT(DC)
Output Continuous Current Range VIN = 24V, VOUT = 12V (Note 4)
0
ΔVOUT(LINE)
VOUT
Line Regulation Accuracy
VOUT = 12V, FCB = 0V, VIN = 22V to 36V,
IOUT = 0A
l
ΔVOUT(LOAD)
VOUT
Load Regulation Accuracy
VOUT = 12V, FCB = 0V, IOUT = 0A to 5A (Note 4)
VIN = 36V
l
VIN = 24V
l
VIN(AC)
Input Ripple Voltage
IOUT = 0A,
CIN = 2 × 10μF X5R Ceramic and 1 × 100μF
Electrolytic, 1 × 10μF X5R Ceramic on VD Pins
VIN = 24V, VOUT = 5V
VIN = 24V, VOUT = 12V
VOUT(AC)
Output Ripple Voltage
IOUT = 0A,
COUT = 2 × 22μF, 2 × 47μF X5R Ceramic
VIN = 24V, VOUT = 5V
VIN = 24V, VOUT = 12V
fS
Output Ripple Voltage Frequency IOUT = 1A, VIN = 24V, VOUT = 12V
ΔVOUT(START)
Turn-On Overshoot,
TRACK/SS = 10nF
COUT = 200μF, VOUT = 12V, IOUT = 0A
VIN = 36V
VIN = 24V
tSTART
Turn-On Time, TRACK/SS = Open
COUT = 300μF, VOUT = 12V, IOUT = 1A
Resistive Load
VIN = 36V
VIN = 24V
ΔVOUT(LS)
Peak Deviation for Dynamic Load
Load: 0% to 50% to 0% of Full Load
COUT = 2 × 22μF Ceramic, 150μF Bulk
VIN = 24V, VOUT = 12V
tSETTLE
Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, VIN = 24V
IOUT(PK)
Output Current Limit
COUT = 200μF
VIN = 36V, VOUT = 12V
VIN = 24V, VOUT = 12V
Control Section
5
A
0.05
0.3
%
0.3
0.6
%
0.3
0.6
%
7.2
mVP-P
3.4
mVP-P
17.5
mVP-P
12.5
mVP-P
940
kHz
20
mV
20
mV
0.5
ms
0.5
ms
153
mV
37
μs
9
A
9
A
VFB
Voltage at VFB Pin
IOUT = 0A, VOUT = 12V
l 0.594 0.6 0.606
V
VRUN
ISS / TRACK
VFCB
IFCB
tON(MIN)
RUN Pin On/Off Threshold
Soft-Start Charging Current
Forced Continuous Threshold
Forced Continuous Pin Current
Minimum On-Time
VSS/TRACK = 0V
VFCB = 0V
(Note 3)
1
1.5
1.9
V
–1
–1.5
–2
μA
0.57
0.6
0.63
V
–1
–2
μA
50
100
ns
tOFF(MIN)
Minimum Off-Time
(Note 3)
250
400
ns
4612f
3
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