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LTC1709-7 Datasheet(PDF) 3 Page - Linear Technology

Part No. LTC1709-7
Description  2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1709-7 Datasheet(HTML) 3 Page - Linear Technology

 
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LTC1709-7
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VBIAS = 5V, VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Input DC Supply Current
(Note 5)
Normal Mode
EXTVCC Tied to VOUT, VOUT = 5V
470
µA
Shutdown
VRUN/SS = 0V
20
40
µA
IRUN/SS
Soft-Start Charge Current
VRUN/SS = 1.9V
– 0.5
–1.2
µA
VRUN/SS
RUN/SS Pin ON Arming
VRUN/SS Rising
1.0
1.5
1.9
V
VRUN/SSLO
RUN/SS Pin Latchoff Arming
VRUN/SS Rising from 3V
4.1
4.5
V
ISCL
RUN/SS Discharge Current
Soft Short Condition VEAIN = 0.5V, VRUN/SS = 4.5V
0.5
2
4
µA
ISDLHO
Shutdown Latch Disable Current
VEAIN = 0.5V
1.6
5
µA
ISENSE
Total Sense Pins Source Current
Each Channel: VSENSE1, 2– = VSENSE1+, 2+ = 0V
– 85
– 60
µA
DFMAX
Maximum Duty Factor
In Dropout
98
99.5
%
Top Gate Transition Time:
(Note 6)
TG1, 2 tr
Rise Time
CLOAD = 3300pF
30
90
ns
TG1, 2 tf
Fall Time
CLOAD = 3300pF
40
90
ns
Bottom Gate Transition Time:
(Note 6)
BG1, 2 tr
Rise Time
CLOAD = 3300pF
30
90
ns
BG1, 2 tf
Fall Time
CLOAD = 3300pF
20
90
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
CLOAD = 3300pF Each Driver (Note 6)
90
ns
Synchronous Switch-On Delay Time
BG/TG t2D
Bottom Gate Off to Top Gate On Delay
CLOAD = 3300pF Each Driver (Note 6)
90
ns
Top Switch-On Delay Time
tON(MIN)
Minimum On-Time
Tested with a Square Wave (Note 7)
180
ns
Internal VCC 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 Switchover Hysteresis
ICC = 20mA, EXTVCC Ramping Negative
0.2
V
VID Parameters
VBIAS
Operating Supply Voltage Range
2.7
5.5
V
RATTEN
Resistance Between ATTENIN
10
k
and ATTENOUT Pins
ATTENERR
Resistive Divider Error
q
– 0.25
– 0.25
%
RPULLUP
VID0 to VID4 Pull-Up Resistance
(Note 8)
40
k
VIDTHLOW
VID0 to VID4 Logic Threshold Low
0.4
V
VIDTHHIGH
VID0 to VID4 Logic Threshold High
1.6
V
VIDLEAK
VID0 to VID4 Leakage
VBIAS < VID0–VID4 < 7V
1
µA
Oscillator and Phase-Locked Loop
fNOM
Nominal Frequency
VPLLFLTR = 1.2V
190
220
250
kHz
fLOW
Lowest Frequency
VPLLFLTR = 0V
120
140
160
kHz
fHIGH
Highest Frequency
VPLLFLTR ≥ 2.4V
280
310
360
kHz
RPLLIN
PLLIN Input Resistance
50
k
IPLLFLTR
Phase Detector Output Current
Sinking Capability
fPLLIN < fOSC
–15
µA
Sourcing Capability
fPLLIN > fOSC
15
µA
RRELPHS
Controller 2-Controller 1 Phase
180
Deg


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