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LTC3734_15 Datasheet, PDF (3/28 Pages) Linear Technology – Single-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs
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LTC3734
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VPVCC = VSVCC = 5V, VRUN/SS = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
IQ
UVR
IRUN/SS
VRUN/SS
VRUN/SSARM
VRUN/SSLO
ISCL
ISDLHO
ISENSE
DFMAX
TG tr
TG tf
BG tr
BG tf
TG/BG t1D
Input DC Supply Current
Normal Mode
Shutdown
Undervoltage RUN/SS Reset
Soft-Start Charge Current
RUN/SS Pin ON Threshold
RUN/SS Pin Latchoff Arming
RUN/SS Pin Latchoff Threshold
RUN/SS Discharge Current
Shutdown Latch Disable Current
Total Sense Pins Source Current
Maximum Duty Factor
Top Gate Transition Time:
Rise Time
Fall Time
Bottom Gate Transition Time:
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
(Note 5)
VRUN/SS = 0V
VCC Lowered Until the RUN/SS Pin is Pulled Low
VRUN/SS = 1.9V
VRUN/SS Rising
VRUN/SS Rising from 3V
VRUN/SS Ramping Negative
Soft Short Condition VFB = 0.375V, VRUN/SS = 4.5V
VFB = 0.375V, VRUN/SS = 4.5V
VSENSE– = VSENSE+ = 0V
In Dropout
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
CLOAD = 3300pF (Note 6)
2
3
20
100
3.2
3.7
4.2
–2.3 –1.5
–0.8
1.0
1.5
1.9
3.9
3.2
–5
–1.5
1.5
5
–85
–60
95
98.5
30
90
40
90
60
90
50
90
50
BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF (Note 6)
60
Top Switch-On Delay Time
tON(MIN)
Minimum On-Time
Tested with a Square Wave (Note 7)
100
VID Parameters
RATTEN
ATTENERR
VIDTHLOW
VIDTHHIGH
VIDLEAK
Oscillator
VID Top Resistance
Resistive Divider Error
VID0 to VID5 Logic Threshold Low
VID0 to VID5 Logic Threshold High
VID0 to VID5 Leakage
(Note 8)
5.33
l –0.25
0.25
0.3
0.7
±1
IFREQSET
FREQSET Input Current
fNOM
Nominal Frequency
fLOW
Lowest Frequency
fHIGH
Highest Frequency
PGOOD Output
VFREQSET = 0V
VFREQSET = 1.2V
VFREQSET = 0V
VFREQSET ≥ 2.4V
–2
–1
320
355
390
190
210
240
490
550
610
VPGL
IPGOOD
VPG
tMASK
tDELAY
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
PGOOD Mask Timer
MCH_PG Delay Time
IPGOOD = 2mA
VPGOOD = 5V
VFB with Respect to Set Output Voltage
VFB Ramping Negative
VFB Ramping Positive
0.1
0.3
±1
–7
–10
–13
7
10
13
100
110
120
15
UNITS
mA
µA
V
µA
V
V
V
µA
µA
µA
%
ns
ns
ns
ns
ns
ns
ns
kΩ
%
V
V
µA
µA
kHz
kHz
kHz
V
µA
%
%
µs
cycles
3734fa
3
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