 English |
|
|
|
|
|
|
|
| LTC3608 Datasheet, PDF (3/24 Pages) Linear Technology – 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter | |||
| |||
| ◁ |
LTC3608
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
junction temperature range, otherwise speciï¬cations are at TA = 25°C. VIN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
SVIN
Operating Input Voltage Range
IQ
Input DC Supply Current
Normal
Shutdown Supply Current
4
18
V
900 2000
μA
15
30
μA
VFB
ÎVFB(LINEREG)
ÎVFB(LOADREG)
IFB
gm(EA)
VFCB
IFCB
tON
tON(MIN)
tOFF(MIN)
IVALLEY(MAX)
IVALLEY(MIN)
ÎVFB(OV)
VRUN/SS(ON)
VRUN/SS(LE)
VRUN/SS(LT)
IRUN/SS(C)
IRUN/SS(D)
VIN(UVLO)
VIN(UVLOR)
RDS(ON)
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Input Current
Error Ampliï¬er Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Valley Current
Maximum Reverse Valley Current
Output Overvoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
Undervoltage Lockout
Undervoltage Lockout Release
Top Switch On-Resistance
Bottom Switch On-Resistance
ITH = 1.2V, â40°C to 85°C (Note 3)
ITH = 1.2V, â40°C to 125°C (Note 3)
VIN = 4V to 18V, ITH = 1.2V (Note 3)
ITH = 0.5V to 1.9V (Note 3)
VFB = 0.6V
ITH = 1.2V (Note 3)
VFCB = 0.6V
ION = 60μA, VON = 1.5V
ION = 60μA, VON = 0V
ION = 180μA, VON = 0V
ION = 30μA, VON = 1.5V
VRNG = 0.5V, VFB = 0.56V, FCB = 0V
VRNG = 0V, VFB = 0.56V, FCB = 0V
VRNG = 0.5V, VFB = 0.64V, FCB = 0V
VRNG = 0V, VFB = 0.64V, FCB = 0V
RUN/SS Pin Rising
RUN/SS Pin Falling
VRUN/SS = 0V
VRUN/SS = 4.5V, VFB = 0V
INTVCC Falling
INTVCC Rising
0.594 0.600 0.606
V
l 0.590 0.600 0.610
V
0.002
%/V
â0.05 â0.3
%
â5
±50
nA
l 1.4
1.7
2
mS
l 0.54
0.6
0.66
V
â1
â2
μA
220
280
340
ns
110
ns
60
100
ns
320
500
ns
l
5
11
A
l
8
16
A
3.5
5.5
7.5
A
5.5
7.5
9.5
A
7
10
13
%
l 0.8
1.5
2
V
4
4.5
V
3.5
4.2
V
â0.5 â1.2
â3
μA
0.8
1.8
3
μA
l
3.4
3.9
V
l
3.5
4
V
10
19
mΩ
8
14
mΩ
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
ÎVLDO(LOADREG) Internal VCC Load Regulation
VEXTVCC
EXTVCC Switchover Voltage
ÎVEXTVCC
EXTVCC Switch Drop Voltage
ÎVEXTVCC(HYS)
EXTVCC Switchover Hysteresis
PGOOD Output
6V < VIN < 18V, VEXTVCC = 4V
ICC = 0mA to 20mA, VEXTVCC = 4V
ICC = 20mA, VEXTVCC Rising
ICC = 20mA, VEXTVCC = 5V
l 4.7
5
5.5
V
â0.1
±2
%
l 4.5
4.7
V
150
300
mV
500
mV
ÎVFBH
ÎVFBL
ÎVFB(HYS)
VPGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
VFB Rising
VFB Falling
VFB Returning
IPGOOD = 5mA
7
10
13
%
â7
â10
â13
%
1
2.5
%
0.15 0.4
V
3608fa
3
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese