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| LTC3618_15 Datasheet, PDF (3/24 Pages) Linear Technology – Dual 4MHz, 3A Synchronous Buck Converter for DDR Termination | |||
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LTC3618
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), SVIN = PVINx = 3.3V, RT = 178k, unless otherwise
specified.
SYMBOL
PARAMETER
CONDITIONS
VIN
VUVLO
OVLO
Operating Voltage Range
Undervoltage Lockout Threshold
Overvoltage Lockout Threshold
SVIN Ramping Down
SVIN Ramping Up
SVIN Ramping Down
Hysteresis
VFB1
VDDQ Feedback Voltage Internal
(Note 3) VTRACK/SS1 = SVIN
Reference with Line and Load
0°C < TJ < 85°C
Regulation
â40°C < TJ < 125°C
Feedback Voltage External Reference (Note 3) VTRACK/SS1 = 0.3V
(Note 6)
(Note 3) VTRACK/SS1 = 0.5V
VFB2
VTT Feedback Reference Voltage with VDDQIN = 1.5V
Line and Load Regulation
VTTR
VTTR Output Voltage with Line and VDDQIN = 1.5V, ILOAD = ±10mA,
Load Regulation
CLOAD = < 0.1µF
IFB
Feedback Input Current
VFBx = 0.6V
VTTR Maximum Output Current
IS
Input Supply Current, Active Mode VFB1 = 0.5V, VMODE = SVIN, VRUN1 = SVIN,
VRUN2 = 0V, (Note 5)
VFBx = 0.5V, VMODE = SVIN, VRUNx = SVIN,
(Note 5)
RDS(ON)
ILIMX
ISW(LKG)
gm(EA)
IEAO
tSOFT-START1
Input Supply Current, Shutdown
Top Switch On-Resistance
Bottom Switch On-Resistance
Peak Current Limit
Positive Limit
Negative Limit
Switch Leakage Current
Error Amplifier Transconductance
Error Amplifier Output Current
VDDQ Internal Soft-Start Time
tSOFT-START2
VTT Internal Soft-Start Time
RON(TRACK/SS1_DIS) TRACK/SS1 Pull-Down Resistance
at Start-Up
SVIN = PVIN = 5.5V, VRUNx = 0V
PVINx = 3.3V (Note 9)
PVINx = 3.3V (Note 9)
Sourcing (Note 7), VFBX = 0.5V
Sinking (Note 7), VFBX = 0.7V
SVIN = PVIN = 5.5V, VRUNx = 0V
â5µA < ITH < 5µA
(Note 4)
VFB1 from 0.06V to 0.54V,
TRACK/SS1 = SVIN
VFB2 from 0V to 0.75V
tTRACK/SS1_DIS
fOSC
fSYNC
VMODE/SYNC
Soft-Start Discharge Time at Start-Up
Oscillator Frequency
Internal Default Oscillator Frequency
Synchronization Frequency
SYNC Level High Voltage
RRT = 178k
VRT = SVIN
tLOW , tHIGH > 30ns
SYNC Level Low Voltage
jSW1âSW2
Output Phase Shift Between SW1
and SW2
VPHASE < 0.15 ⢠SVIN
0.35 ⢠SVIN < VPHASE < 0.65 ⢠SVIN
VPHASE > 0.85 ⢠SVIN
MIN
TYP
l 2.25
1.8
6.2
300
MAX UNITS
5.5
V
V
2.2
V
V
mV
0.592
0.6
0.608
V
l 0.590
0.610
V
0.289
0.3
0.311
V
0.489
0.5
0.511
V
l VTTR â 6 VTTR VTTR + 6
mV
l 0.49 ⢠VDDQ 0.5 ⢠VDDQ 0.51 ⢠VDDQ
V
l
0
±30
nA
±10
mA
2.4
mA
2.8
mA
0.1
1
µA
75
mΩ
55
mΩ
4.2
5.5
â2.5
â3.5
0.01
240
±30
0.5
1.1
8.0
A
â5.5
A
1
µA
µmho
µA
2
ms
0.25
0.6
1
ms
200
Ω
65
l 1.85
2.25
l 1.8
2.25
0.4
1.2
0
90
180
µs
2.65
MHz
2.7
MHz
4
MHz
V
0.3
V
Deg
Deg
Deg
3618fc
For more information www.linear.com/LTC3618
3
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