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| LTC3646-1_15 Datasheet, PDF (3/28 Pages) Linear Technology – 40V, 1A Synchronous Step-Down Converter | |||
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LTC3646/LTC3646-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), PVIN = SVIN = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
Input Supply (PVIN, SVIN)
VIN
VIN(OV)
Input Voltage Operating â¯Range
Input Supply Overvoltage Lockout
VIN(UV)
Input Supply Undervoltage Lockout
IQ
DC Supply Current (Note 3)
Forced Continuous
Sleep Mode
Shutdown Mode
Main Control Loop
VIN Rising
Hysteresis (VIN Falling)
VIN Falling
Hysteresis (VIN Rising)
VRUN = 0V
l
4.0
40
V
l
43.5
46
V
l
2.0
2.5
2.9
V
3.2
3.35
3.5
V
250
mV
620
875
µA
140
190
µA
8
µA
VOUT
Output Voltage Range (Note 4)
LTC3646
LTC3646-1
2.0
30
V
0.6
15
V
VFB
Feedback Reference Voltage
â40°C < TA < 85°C
0.594
0.6 0.606
V
l
0.591
0.6 0.609
V
gm(EA)
tON(MIN)
tOFF(MIN)
ILIM
Feedback⯠Voltage Line Regulation
Feedback⯠Voltage Load Regulation
Feedback Input Current
Error Amplifier Transconductance
Minimum On-Time
Minimum Off-Time
Valley Switch Current Limit
Internal Oscillator Frequency
External Clock Frequency Range
VIN = 4.0V to 40V, ITH = 1.5V
ITH = 1.0V to 1.8V
VFB = 0.6V
External Comp
VIN = 40V, RRT = 30k, VON = 2V
VRT = VINTVCC
RRT = 450kΩ
RRT = 60kΩ
RRT = 30kΩ
l
l
0.9
1.6
0.19
1.25
2.55
0.2
0.05
%/V
0.12
%
0
±20
nA
300
µS
30
ns
80
ns
1.2
1.5
A
2.25 2.95
MHz
0.2
0.27
MHz
1.5
1.75
MHz
3.0
3.45
MHz
3.0
MHz
RDS(ON)
Top Switch On-Resistance (Note 5)
Bottom Switch On-Resistance (Note 5)
Switch Leakage
Internal VCC Regulator
VINTVCC
INTVCC Voltage
INTVCC Load Regulation (Note 6)
INTVCC Undervoltage Lockout
INTVCC UVLO Hysteresis
EXTVCC Switchover Voltage
EXTVCC Hysteresis
Operation
VIN = 5.5V
VIN = 5.5V
VIN = VSW = 40V, VRUN = 0V
VIN = 40V, VSW = 0V, VRUN = 0V
IINTVCC = 5mA
IINTVCC = 0mA to 5mA
INTVCC Falling
EXTVCC Rising
l
4.8
4.25
200
mâ¦
120
mâ¦
±1
µA
±1
µA
5.0
5.2
V
0.5
%
3.0
V
0.3
V
4.5
4.65
V
200
mV
VRUN
RUN Pin Threshold
RUN Rising
RUN Falling
Hysteresis
1.17
1.21 1.26
V
1.06
1.10 1.14
V
110
mV
RUN Pin Leakage Current
RUN = 1.3V
0
±1
µA
VPGOOD(UT) PGOOD Overvoltage Threshold
VPGOOD(LT) PGOOD Undervoltage Threshold
tPGOOD
PGOOD Filter Time
FB Rising
FB Falling
FB Falling
FB Rising
RT = INTVCC
5.0
7.5
10
%VFB
3.5
5
%VFB
â5.0
â7.5
â10
%VFB
â3.5
â5
%VFB
15
30
µs
For more information www.linear.com/LTC3646
36461fb
3
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