3692 데이터 시트보기 (PDF) - Linear Technology
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3692 Datasheet PDF : 36 Pages
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LT3692
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VVIN1/2 = 15V unless otherwise specified. (Note 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RT/SYNC to CLKOUT Delay ( tDRTSYNCH)
RT/SYNC to CLKOUT Delay ( tDRTSYNCL)
SYNC Frequency Range
SYNC Phase Angle Ch 1 to Ch 2
Minimum Switch On-Time Ch 1/2
VRT/SYNC = 0V to 2V Rising Edge
VRT/SYNC = 2V to 0V Falling Edge
SYNC Frequency = 250kHz
300
ns
150
ns
250
2000
kHz
180
Deg
180
ns
Minimum Switch Off-Time Ch 1/2
Minimum Boost for 100% DC Ch 1/2 (Note 10)
IND + VOUT Current Ch 1/2
ILIM1/2 Reference Current
IND to VOUT Maximum Current Ch 1/2
Switch Leakage Current Ch 1/2
Switch Saturation Voltage Ch 1/2
Boost Current Ch 1/2
Minimum Boost Voltage Ch1/2 (Note 12)
VVOUT1/2 = 0V
VVOUT1/2 = 5V
VFB1/2 = 0.9V, VILIM = 0.4V
VILIM1/2 = 0V, VVOUT = 1V (Note 11)
VILIM1/2 = 0V, VVOUT = 5V (Note 11)
VILIM1/2 = 0.5V, VVOUT = 1V (Note 11)
VILIM1/2 = 0.5V, VVOUT = 5V (Note 11)
VILIM1/2 = 1.5V, VVOUT = 1V (Note 11)
VILIM1/2 = 1.5V, VVOUT = 5V (Note 11)
VSW1/2 = 0V
ISW1/2 = 500mA, VBST1/2 = 18V
ISW1/2 = 3A, VBST1/2 = 18V
ISW1/2 = 500mA, VBST1/2 = 18V
ISW1/2 = 3A, VBST1/2 = 18V
ISW1/2 = 3A, VBST1/2 = 18V
200
ns
1.4
1.8
2.2
V
1.5
5
µA
0.5
5
µA
l
10
12
14
µA
1
1.8
2.6
A
1.25
2
2.75
A
1.6
2.6
3.6
A
1.8
2.8
3.8
A
l
3.8
4.8
5.8
A
l
3.8
4.8
5.8
A
l
1
5.0
µA
100
mV
300
mV
9
13
17
mA
40
55
70
mA
1.75
2.0
2.5
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Absolute Maximum Voltage at VIN1/2 and SHDN1/2 pins is 60V for
nonrepetitive 1 second transients and 40V for continuous operation.
Note 3: The LT3692EUH is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3692IUH is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 4: The SHDN pins can be connected to VIN or driven by a logic-level
source with a series current limiting resistor.
Note 5: VIN undervoltage lockout is defined as the voltage which the VIN
pin must exceed for operation. The threshold guarantees that internal bias
lines are regulated and switching frequency is constant. Actual minimum
input voltage to maintain a regulated output will depend upon output
voltage and load current. See Applications Information.
Note 6: VIN overvoltage lockout is defined as the voltage when exceeded
halts converter operation. See Applications Information.
Note 7: The TJ output voltage represents the temperature at the center
of the die while dissipating quiescent power. Due to switch power
dissipation and temperature gradients across the die, the TJ output
voltage measurement does not guarantee that absolute maximum junction
temperature will not be exceeded.
Note 8: An internal power on reset (POR) latch is set on the positive
transition of the SHDN1/2 pin through its threshold, thermal shutdown or
overvoltage lockout. The output of the latch activates current sources on
each SS pin which typically sink 400µA and discharge the SS capacitor.
The latch is reset when both SS pins are driven below the soft-start POR
threshold or the SHDN pin is taken below its threshold.
Note 9: The threshold is expressed as a percentage of the feedback
reference voltage for the channel.
Note 10: To enhance dropout operation, the output switch will be turned
off for the minimum off-time only when the voltage across the boost
capacitor drops below the minimum boost for 100% duty cycle threshold.
Note 11: The IND to VOUT maximum current is defined as the value of
current flowing from the IND pin to the VOUT pin which resets the switch
latch when the VC pin is at its high clamp.
Note 12: This is the minimum voltage across the boost capacitor needed
to guarantee full saturation of the internal power switch.
3692f
4
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