LT3992 데이터 시트보기 (PDF) - Linear Technology
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LT3992 Datasheet PDF : 36 Pages
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LT3992
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 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
CH1 DIV 4 Threshold
CH1 DIV 8 Threshold
CLKOUT VOL
CLKOUT VOH
CLKOUT to SW1ON Delay ( tDCLKOSW1)
CLKOUT to SW2ON Delay ( tDCLKOSW2)
RT/SYNC to CLKOUT Delay ( tDRTSYNCH)
RT/SYNC to CLKOUT Delay ( tDRTSYNCL)
SYNC Frequency Range
RRT/SYNC = 0V
RRT/SYNC = 0V
CLKOUT Rising
CLKOUT Falling
VRT/SYNC = 0V to 2V Rising Edge
VRT/SYNC = 2V to 0V Falling Edge
0.89
1.0
1.06
1.39
1.5
1.56
0.25
2
60
30
300
150
250
2000
SYNC Phase Angle CH1 to CH2
SYNC Frequency = 250kHz
180
Minimum Switch On-Time CH1/2
160
Minimum Switch Off-Time CH1/2
200
Minimum Boost for 100% DC CH1/2 (Note 7)
1.6
2.2
2.6
IND + VOUT Current CH1/2
ILIM1/2 Reference Current
IND to VOUT Maximum Current CH1/2
Switch Leakage Current CH1/2
Switch Saturation Voltage CH1/2
Boost Current CH1/2
Minimum Boost Voltage CH1/2 (Note 9)
VVOUT1/2 = 0V
VVOUT1/2 = 5V
VILIM = 0V
VILIM1/2 = 0.5V, VVOUT = 1V (Note 8)
VILIM1/2 = 0.5V, VVOUT = 5V (Note 8)
VILIM1/2 = 1.5V, VVOUT = 1V (Note 8)
VILIM1/2 = 1.5V, VVOUT = 5V (Note 8)
VSW1/2 = 0V
ISW1/2 = 500mA, VBST1/2 = 18V
ISW1/2 = 3A, VBST1/2 = 18V
ISW1/2 = 500mA, VBST1/2 = 8V
ISW1/2 = 3A, VBST1/2 = 8V
ISW1/2 = 3A, VBST1/2 = 8V
1.5
5
0.5
5
l
10
12
16
0.5
1.5
3
0.7
1.8
3
l
3.5
4.6
6.4
l
3.5
4.6
6.4
l
1
10
200
325
5
8
25
35
55
85
1.0
2.2
3.0
UNITS
V
V
V
V
ns
ns
ns
ns
kHz
Deg
ns
ns
V
µA
µA
µA
A
A
A
A
µA
mV
mV
mA
mA
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: The LT3992EUH/LT3992EFE 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 LT3992IUH/LT3992IFE is guaranteed over the full –40°C to 125°C
operating junction temperature range. The LT3992HFE is guaranteed
over the full –40°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperatures greater than 125°C.
Note 3: 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 the Applications Information section.
Note 4: 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 5: 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 450µA 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 6: The threshold is expressed as a percentage of the feedback
reference voltage for the channel.
Note 7: 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 8: 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 9: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
3992fa
4
For more information www.linear.com/LT3992
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