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LTC3609 Datasheet, PDF (3/24 Pages) Linear Technology – 32V, 6A Monolithic Synchronous Step-Down DC/DC Converter
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LTC3609
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications 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
32
V
900 2000
μA
15
30
μA
VFB
Feedback Reference Voltage
ITH = 1.2V (Note 3)
–40°C to 85°C
–40°C to 125°C
0.594 0.600 0.606
V
l 0.590 0.600 0.610
V
ΔVFB(LINEREG)
ΔVFB(LOADREG)
IFB
gm(EA)
VFCB
IFCB
tON
tON(MIN)
tOFF(MIN)
IVALLEY(MAX)
IVALLEY(MIN)
ΔVFB(OV)
VRUN/SS(ON)
VRUN/SS(LE)
VRUN/SS(LT)
IRUN/SS(C)
IRUN/SS(D)
VIN(UVLO)
VIN(UVLOR)
RDS(ON)
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Input Current
Error Amplifier 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
VIN = 4V to 30V, 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 = 0V, VFB = 0.56V, FCB = 0V
VRNG = 1.2V, VFB = 0.56V, FCB = 0V
VRNG = 0V, VFB = 0.64V, FCB = 0V
VRNG = 1.2V, VFB = 0.64V, FCB = 0V
RUN/SS Pin Rising
RUN/SS Pin Falling
VRUN/SS = 0V
VRUN/SS = 4.5V, VFB = 0V
VIN Falling
VIN Rising
0.002
%/V
–0.05 –0.3
%
–5
±50
nA
l 1.4
1.7
2
mS
l 0.54
0.6
0.66
V
–1
–2
μA
220
280
340
ns
110
ns
60
100
ns
320
500
ns
l
4
9
A
l
6
14
A
2
4
6
A
4
7
10
A
7
10
13
%
l 0.8
1.5
2
V
4
4.5
V
3.5
4.2
V
–0.5 –1.2
–3
μA
0.8
1.8
3
μA
l
3.4
3.9
V
l
3.5
4
V
18
27
mΩ
13
22
mΩ
3609f
3
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