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LTC1709-8 데이터시트(PDF) 3 Page - Linear Technology

부품명 LTC1709-8
상세설명  2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulators
PDF  28 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1709-8 데이터시트(HTML) 3 Page - Linear Technology

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LTC1709-8/LTC1709-9
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
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
LTC1709-8
20
k
Ω
and ATTENOUT Pins
LTC1709-9
10
k
Ω
ATTENERR
Resistive Divider Error
LTC1709-8: VID4 = 0; LTC1709-9
q
– 0.25
0.25
%
LTC1709-8: VID4 = 1
q
–0.35
0.25
%
RPULLUP
VID0–VID4 Pull-Up Resistance
(Note 8)
40
k
Ω
VIDTHLOW
VID0–VID4 Logic Threshold Low
0.4
V
VIDTHHIGH
VID0–VID4 Logic Threshold High
1.6
V
VIDLEAK
VID0–VID4 Leakage
VBIAS < VID0–VID4 < 7V
0.1
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
320
360
kHz
RPLLIN
PLLIN Input Resistance
50
k
Ω
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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