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LTC3718_15 Datasheet, PDF (3/20 Pages) Linear Technology – Low Input Voltage DC/DC Controller for DDR/QDR Memory Termination
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LTC3718
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN1 = 15V, VIN2 = 1.5V unless otherwise noted.
SYMBOL
VRUN/SS(LT)
IRUN/SS(C)
IRUN/SS(D)
VIN(UVLO)
PARAMETER
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
VIN1 Undervoltage Lockout
TG RUP
TG Driver Pull-Up On Resistance
TG RDOWN
TG Driver Pull-Down On Resistance
BG RUP
BG Driver Pull-Up On Resistance
BG RDOWN
BG Driver Pull-Down On Resistance
TG tr
TG Rise Time
TG tf
TG Fall Time
BG tr
BG Rise Time
BG tf
BG Fall Time
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
∆VLDO(LOAD) Internal VCC Load Regulation
PGOOD Output
∆VFB1H
PGOOD Upper Threshold
∆VFB1L
PGOOD Lower Threshold
∆VFB1(HYS)
PGOOD Hysterisis
VPGL
PGOOD Low Voltage
Boost Regulator
VIN2(MIN)
VIN2(MAX)
IQ(VIN2)
Minimum Operating Voltage
Maximum Operating Voltage
Input DC Supply Current (VIN2)
Normal
Shutdown Supply Current
VFB2
VFB2 Feedback Voltage
IVFB2
∆VFB2(LINE)
fBOOST
VFB2 Pin Bias Current
Boost Reference Line Regulation
BOOST Switching Frequency
DCBOOST(MAX)
ILIM(BOOST)
VCESAT(BOOST)
ISWLKG(BOOST)
VSHDN(HIGH)
VSHDN(LOW)
ISHDN
BOOST Maximum Duty Cycle
BOOST Switch Current Limit
BOOST Switch VCESAT
BOOST Switch Leakage Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
CONDITIONS
RUN/SS Pin Falling
VRUN/SS = 0V
VRUN/SS = 4.5V, VFB = 0V
VIN Falling
VIN Rising
TG High
TG Low
BG High
BG Low
CLOAD = 3300pF
CLOAD = 3300pF
CLOAD = 3300pF
CLOAD = 3300pF
6V < VIN1 <30V
ICC = 0mA to 20mA
VFB1 = Rising
VFB1 = Falling
VFB1 = Returning
IPGOOD = 5mA
VSHDN=0V
0°C < T < 70°C
1.5V < VIN2 < 10V
0°C < T < 70°C
(Note 5)
ISW = 300mA
VSW = 5V
VSHDN = 3V
VSHDN = 0V
MIN TYP MAX
3.5
4.2
– 0.5 –1.2
–3
0.8
1.8
3
q
3.4
3.9
q
3.5
4.0
2
3
2
3
3
4
1
2
20
20
20
20
q 4.7
5
5.3
– 0.1
±2
8
10
12
–8
–10 –12
1
2
0.15
0.4
0.9
1.5
10
3
4.5
0.01
1
1.205 1.23 1.255
q 1.20 1.23 1.26
q
27
80
0.02
0.2
1.0
1.4
1.8
q 0.9
1.4
1.9
82
86
500
800
300 350
0.01
1
1
0.3
25
50
0.01
0.1
UNITS
V
µA
µA
V
V
Ω
Ω
Ω
Ω
ns
ns
ns
ns
V
%
%
%
%
V
V
V
mA
µA
V
V
nA
%/V
MHz
MHz
%
mA
mV
µA
V
V
µA
µA
3718fa
3
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