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LTC1876 Datasheet(PDF) 3 Page - Linear Technology

Part No. LTC1876
Description  High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
Download  36 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1876 Datasheet(HTML) 3 Page - Linear Technology

 
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LTC1876
3
1876fa
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
UVLO
Undervoltage Lockout
VIN Ramping Down
q
3.5
4
V
VOVL
Overvoltage Feedback Threshold
Measured at VOSENSE1, 2
q
0.84
0.86
0.88
V
ISENSE
Sense Pins Total Source Current
(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;
0.5
2
4
µA
VRUN/SS1, 2 = 4.5V
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
TG Transition Time:
TG1, 2 tr
Rise Time
CLOAD = 3300pF
50
90
ns
TG1, 2 tf
Fall Time
CLOAD = 3300pF
50
90
ns
BG Transition Time:
BG1, 2 tr
Rise Time
CLOAD = 3300pF
40
90
ns
BG1, 2 tf
Fall Time
CLOAD = 3300pF
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
Oscillator frequency
VFREQSET = Open (Note 8)
190
220
250
kHz
fLOW
Lowest Frequency
VFREQSET = 0V
120
140
160
kHz
fHIGH
Highest Frequency
VFREQSET = 2.4V
280
310
360
kHz
IFREQSET
FREQSET Input Current
VFREQSET = 2.4V
–2
–1
µA
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.


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