LTC1876 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1876
Linear Technology
LTC1876 Datasheet PDF : 36 Pages
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LTC1876
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, AUXVIN = 3V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
UVLO
Undervoltage Lockout
VIN Ramping Down
q
3.5
4
V
VOVL
ISENSE
Overvoltage Feedback Threshold
Sense Pins Total Source Current
Measured at VOSENSE1, 2
q 0.84 0.86 0.88
V
(Each
Channel);
VSENSE1–,
2
–
=
VSENSE1+,
+
2
=
0V
–85 –60
µA
VSTBYMD MS Master Shutdown Threshold
VSTBYMD Ramping Down
0.4
0.6
V
VSTBYMD KA Keep-Alive Power On-Threshold
VSTBYMD Ramping Up, RUNSS1, 2 = 0V
1.5
2
V
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
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
VSENSE(MAX)
Shutdown Latch Disable Current
Maximum Current Sense Threshold
VOSENSE1, 2 =0.5V
VOSENSE1,
2
=
0.7V,
VSENSE1–,
–
2
=
5V
1.6
5
µA
q 62
75
88
mV
TG1, 2 tr
TG1, 2 tf
TG Transition Time:
Rise Time
Fall Time
CLOAD = 3300pF
CLOAD = 3300pF
50
90
ns
50
90
ns
BG1, 2 tr
BG1, 2 tf
BG Transition Time:
Rise Time
Fall Time
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 7)
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
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
fLOW
fHIGH
IFREQSET
Oscillator frequency
Lowest Frequency
Highest Frequency
FREQSET Input Current
VFREQSET = Open (Note 8)
VFREQSET = 0V
VFREQSET = 2.4V
VFREQSET = 2.4V
190
220
250
kHz
120 140 160
kHz
280 310 360
kHz
–2
–1
µA
1876fa
3
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