LT3791-1 Просмотр технического описания (PDF) - Linear Technology
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LT3791-1 Datasheet PDF : 26 Pages
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LT3791-1
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
C/10 Rising Threshold (VFB)
C/10 Falling Threshold (VFB)
C/10 Falling Threshold (V(ISP-ISN))
SHORT Falling Threshold (VFB)
C/10 Pin Output Impedance
V(ISP-ISN) = 0V
VFB = 1.2V
l 1.127 1.15 1.173
V
l 1.078 1.1
1.122
V
5
10
15
mV
380
400
450
mV
1.1
2.0
kΩ
SHORT Pin Output Impedance
1.1
2.0
kΩ
SS Latch-Off Threshold
1.75
V
SS Reset Threshold
0.2
V
Oscillator
Switching Frequency
SYNC Frequency
RT = 147k
RT = 59.0k
RT = 29.1k
190
200
210
kHz
380
400
420
kHz
665
700
735
kHz
200
700
kHz
SYNC Pin Resistance to GND
90
kΩ
SYNC Threshold Voltage
0.3
1.5
V
Internal VCC Regulator
INTVCC Regulation Voltage
Dropout (VIN – INTVCC)
INTVCC Undervoltage Lockout
INTVCC Current Limit
PWM
IINTVCC = –10mA, VIN = 5V
VINTVCC = 4V
4.8
5
5.2
V
240
350
mV
3.1
3.5
3.9
V
67
mA
PWM Threshold Voltage
0.3
1.5
V
PWM Pin Resistance to GND
90
kΩ
PWMOUT Pull-Up Resistance
10
20
Ω
PWMOUT Pull-Down Resistance
5
10
Ω
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
VBST – VSW = 5V
2.6
Ω
1.7
Ω
BG1, BG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
VINTVCC = 5V
3
Ω
1.2
Ω
TG Off to BG On Delay
BG Off to TG On Delay
TG1, TG2, tOFF(MIN)
CL = 3300pF
CL = 3300pF
RT = 59.0k
60
ns
60
ns
240
300
ns
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 LT3791E-1 is guaranteed to meet performance from
0°C to 125°C junction temperature. Specification over the -40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
The LT3791I-1 is guaranteed to meet performance specifications over the
–40°C to 125°C operating junction temperature range. The LT3791H-1 is
guaranteed to meet performance specifications over the –40°C to 150°C
operating junction temperature range. The LT3791MP-1 is guaranteed
to meet performance specifications over the –55°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated for junction temperatures greater
than 125°C.
Note 3: The LT3791-1 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified absolute maximum operating junction temperature may
impair device reliability.
37911fa
4
For more information www.linear.com/LT3791-1
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