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LTC3633A-1_15 Datasheet, PDF (3/30 Pages) Linear Technology – Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator
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LTC3633A/LTC3633A-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VIN1 = VIN2 = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN1
Supply Range
l
3.6
20
V
VIN1 Supply Range
VIN2 Supply Range
3.6V < VIN1 < 20V
l
3.6
l
1.5
20
V
20
V
Output Voltage Range (Note 4)
LTC3633A, VON = VOUT
0.6
LTC3633A-1, VON = VOUT
1.5
6
V
12
V
IQ
Input DC Supply Current (VIN1 + VIN2)
Both Channels Active (Note 5)
MODE = 0V
Sleep Current
Shutdown
MODE = INTVCC, VFB1, VFB2 > 0.6
RUN1 = RUN2 = 0V
1.3
mA
500
µA
13
µA
VFB
Feedback Reference Voltage
l 0.594
0.6
0.606
V
∆VLINE_REG
∆VLOAD_REG
IFB
gm(EA)
Reference Voltage Line Regulation
Output Voltage Load Regulation
Feedback Pin Input Current
Error Amplifier Transconductance
VIN = 3.6V to 20V
ITH = 0.8V to 1.6V
ITH = 1.2V
0.002
%/V
0.05
%
±30
nA
1.8
mS
tON
Minimum On Time
VON = 0.6V, VIN = 4V
20
ns
tOFF
Minimum Off Time
VIN = 6V
45
ns
fOSC
Oscillator Frequency
VRT = INTVCC
RT = 162k
RT = 80.6k
1.4
2
2.6
MHz
1.7
2
2.3
MHz
3.4
4
4.6
MHz
ILIM
Positive Valley Switch Current Limit
2.6
3.5
4.5
A
Negative Inductor Valley Current Limit
–2
A
RDS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
130
mΩ
65
mΩ
ISW(LKG)
Switch Leakage Current
VIN = 20V, VRUN = 0V
0.01
±1
µA
VVIN-OV
VIN Overvoltage Lockout Threshold
VIN Rising
VIN Falling
22.5
V
20.3
21.5
22.5
V
INTVCC Voltage
3.6V < VIN < 20V, 0mA Load
3.1
3.3
3.5
V
INTVCC Load Regulation
0mA to 50mA Load, VIN = 4V to 20V
1.3
%
RUN Threshold Rising
RUN Threshold Falling
l
1.18
1.22
1.26
V
l 0.98
1.01
1.04
V
RUN Leakage Current
V2P5 Voltage
VIN = 20V
ILOAD = 0mA to 10mA
0
±3
µA
l 2.46
2.5
2.54
V
PGOOD Good-to-Bad Threshold
VFB Rising
VFB Falling
8
10
%
–8
–10
%
PGOOD Bad-to-Good Threshold
VFB Rising
VFB Falling
–3
–5
%
3
5
%
RPGOOD
PGOOD Pull-Down Resistance
10mA Load
20
Ω
tPGOOD
tSS
ITRACKSS
Power Good Filter Time
Internal Soft-Start Time
VFB During Tracking
TRACKSS Pull-Up Current
10% to 90% Rise Time
TRACKSS = 0.3V
20
40
µs
400
700
µs
0.28
0.3
0.315
V
1.4
µA
For more information www.linear.com/LTC3633A
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