LTC1628I 查看數據表（PDF） - Linear Technology
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LTC1628I Datasheet PDF : 32 Pages
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LTC1628/LTC1628-PG
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VSTBYMD KA
DFMAX
IFLTCPL
VFLTCPL
Keep-Alive Power On-Threshold
Maximum Duty Factor
VFLTCPL Input Current
LTC1628 Only
Fault Coupling Threshold;
LTC1628 Only
VSTBYMD Ramping Up, RUNSS1, 2 = 0V
In Dropout
0.5V > VFLTCPL
INTVCC – 0.5V < VFLTCPL < INTVCC
For FCB Signal and Individual Overcurrent
Faults to Affect Both Controllers
1.5
2
V
98
99.4
%
–3
µA
3
µA
2
V
IRUN/SS1, 2
Soft-Start Charge Current
VRUN/SS1, 2 = 1.9V
0.5
1.2
µA
VRUN/SS1, 2 ON RUN/SS Pin ON Threshold
VRUN/SS1, VRUN/SS2 Rising
1.0
1.5
1.9
V
VRUN/SS1, 2 LT RUN/SS Pin Latchoff Arming Threshold VRUN/SS1, VRUN/SS2 Rising from 3V
4.1
4.5
V
ISCL1, 2
RUN/SS Discharge Current
Soft Short Condition VOSENSE1, 2 = 0.5V;
VRUN/SS1, 2 = 4.5V
0.5
2
4
µA
ISDLHO
Shutdown Latch Disable Current
VOSENSE1, 2 = 0.5V
1.6
5
µA
VSENSE(MAX) Maximum Current Sense Threshold
VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V
q 62
75
88
mV
VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V, LTC1628 Only
65
75
85
mV
TG1, 2 tr
TG1, 2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 5)
CLOAD = 3300pF
CLOAD = 3300pF
50
90
ns
50
90
ns
BG1, 2 tr
BG1, 2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 5)
CLOAD = 3300pF
CLOAD = 3300pF
40
90
ns
40
80
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver
90
ns
BG/TG t2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
90
ns
tON(MIN)
Minimum On-Time
Tested with a Square Wave (Note 6)
180
ns
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 30V, VEXTVCC = 4V
4.8
5.0
5.2
V
VLDO INT
INTVCC Load Regulation
ICC = 0 to 20mA, VEXTVCC = 4V
0.2
1.0
%
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V, LTC1628
120 240
mV
VLDO EXT-PG EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V, LTC1628-PG
80
160
mV
VEXTVCC
EXTVCC Switchover Voltage
ICC = 20mA, EXTVCC Ramping Positive
q 4.5
4.7
V
VLDOHYS
EXTVCC Hysteresis
0.2
V
Oscillator
fOSC
Oscillator frequency
fLOW
Lowest Frequency
fHIGH
Highest Frequency
IFREQSET
FREQSET Input Current
3.3V Linear Regulator
VFREQSET = Open (Note 7)
VFREQSET = 0V
VFREQSET = 2.4V
VFREQSET = 0V
190 220 250
kHz
120 140 160
kHz
280 310 360
kHz
–2
–1
µA
V3.3OUT
3.3V Regulator Output Voltage
V3.3IL
3.3V Regulator Load Regulation
V3.3VL
3.3V Regulator Line Regulation
PGOOD Output (LTC1628-PG Only)
No Load
I3.3 = 0 to 10mA
6V < VIN < 30V
q 3.25 3.35 3.45
V
0.5
2
%
0.05
0.2
%
VPGL
IPGOOD
VPG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
IPGOOD = 2mA
VPGOOD = 5V
VOSENSE Respect to Set Output Voltage
VOSENSE Ramping Negative
VOSENSE Ramping Positive
0.1
0.3
V
±1
µA
–6
–7.5 – 9.5
%
6
7.5
9.5
%
3
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