LTC3727EUH-1 查看數據表（PDF） - Linear Technology
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LTC3727EUH-1 Datasheet PDF : 32 Pages
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LTC3727/LTC3727-1
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
gmGBW1, 2
IQ
VFCB
IFCB
VBINHIBIT
Transconductance Amplifier GBW
Input DC Supply Current
Normal Mode
Shutdown
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
ITH1, 2 = 1.2V (Note 4)
(Note 5)
VIN = 15V, EXTVCC Tied to VOUT1, VOUT1 = 8.5V
VRUN/SS1, 2 = 0V
VFCB = 0.85V
Measured at FCB pin
3
MHz
670
µA
20
35
µA
q 0.76 0.800 0.84
V
– 0.30 – 0.18 – 0.05
µA
6.8
7.3
V
UVLO
VOVL
Undervoltage Lockout
Feedback Overvoltage Lockout
VIN Ramping Down
Measured at VOSENSE1, 2
q
3.5
4
V
q 0.84 0.86 0.88
V
ISENSE
Sense Pins Total Source Current
(Each Channel) VSENSE1–, 2 – = VSENSE1+, 2+ = 0V
– 85 – 60
µA
DFMAX
Maximum Duty Factor
In Dropout
98
99.4
%
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 (LTC3727 Only)
4.1
4.5
V
ISCL1, 2
RUN/SS Discharge Current
Soft-Short Condition VOSENSE1, 2 = 0.5V,
VRUN/SS1, 2 = 4.5V (LTC 3727 Only)
0.5
2
4
µA
ISDLHO
Shutdown Latch Disable Current
VOSENSE1, 2 = 0.5V (LTC3727 Only)
1.6
5
µA
VSENSE(MAX) Maximum Current Sense Threshold
VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 12V
VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 12V
115 135 155
mV
q 105
135
165
mV
TG1, 2 tr
TG1, 2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
50
90
ns
50
90
ns
BG1, 2 tr
BG1, 2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
40
90
ns
40
80
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver
Synchronous Switch-On Delay Time
90
ns
BG/TG t2D
Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver
Top Switch-On Delay Time
90
ns
tON(MIN)
Minimum On-Time
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
VLDO INT
INTVCC Load Regulation
VLDO EXT
EXTVCC Voltage Drop
VEXTVCC
EXTVCC Switchover Voltage
VLDOHYS
EXTVCC Hysteresis
Oscillator and Phase-Locked Loop
Tested with a Square Wave (Note 7)
8.5V < VIN < 30V, VEXTVCC = 6V
ICC = 0mA to 20mA, VEXTVCC = 6V
ICC = 20mA, VEXTVCC = 8.5V
ICC = 20mA, EXTVCC Ramping Positive
180
ns
7.2
7.5
7.8
V
0.2
1.0
%
70
160
mV
q 6.9
7.3
V
0.3
V
fNOM
fLOW
fHIGH
RPLLIN
IPLLFLTR
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
Sinking Capability
Sourcing Capability
VPLLFLTR = 1.2V
VPLLFLTR = 0V
VPLLFLTR ≥ 2.4V
fPLLIN < fOSC
fPLLIN > fOSC
350 380 430
kHz
220 255 290
kHz
460 530 580
kHz
50
kΩ
–15
µA
15
µA
3727f
3
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