LTC3774 데이터 시트보기 (PDF) - Linear Technology
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LTC3774 Datasheet PDF : 38 Pages
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LTC3774
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). VIN = 15V, VRUN = 5V unless otherwise specified.
SYMBOL
PARAMETER
VPG1(HYST)
PGOOD Trip Level Hysteresis
INTVCC Linear Regulator
VINTVCC
Linear Regulator Voltage
VLDO INT
INTVCC Load Regulation
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
VPHSMD = 0V
IFREQ
RMODE/PLLIN
VMODE/PLLIN
VCLKOUT
θ2 – θ1
FREQ Pin Output Current
MODE/PLLIN Input Resistance
PLLIN Input Threshold
Low Output Voltage
High Output Voltage
Channel 1-2 Phase Delay
θCLKOUT – θ1
CLKOUT to Channel 1
Phase Delay
θ1 – θCLKIN
Channel 1 to CLKIN Phase Delay
PWM/PWMEN Outputs
PWM
PWM Output High Voltage
PWM Output Low Voltage
PWM Output Current in Hi-Z State
PWMEN
PWMEN Output High Voltage
CONDITIONS
6V < VIN < 38V
ICC = 0mA to 20mA
RFREQ < 23.2kΩ
RFREQ = 30.1kΩ
RFREQ = 47.5kΩ
RFREQ = 54.9kΩ
RFREQ = 75.0kΩ
Maximum Frequency
Minimum Frequency
VFREQ = 0.8V
VMODE/PLLIN Rising
VMODE/PLLIN Falling
ILOAD = –500µA
ILOAD = 500µA
VPHSMD = 0V
VPHSMD = 1/4 INTVCC
VPHSMD = Float
VPHSMD = 3/4 INTVCC
VPHSMD = INTVCC
VPHSMD = 0V
VPHSMD = 1/4 INTVCC
VPHSMD = Float
VPHSMD = 3/4 INTVCC
VPHSMD = INTVCC
VPHSMD = 0V
VPHSMD = 1/4 INTVCC
VPHSMD = Float
VPHSMD = 3/4 INTVCC
VPHSMD = INTVCC
ILOAD = 500µA
ILOAD = –500µA
ILOAD = 500µA
MIN TYP MAX
2
5.3
5.5
5.7
0.5
2
150
250
540
600
660
750
1.05
l 1.2
l
0.2
19
20
21
250
2
1.2
0.2
5.2
180
180
180
180
120
60
60
90
45
240
0
90
0
0
0
l 5.0
l
0.5
l –5
5
l 5.0
UNITS
%
V
%
kHz
kHz
kHz
kHz
MHz
MHz
MHz
µA
kΩ
V
V
V
V
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Deg
V
V
µA
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 LTC3774 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3774E is guaranteed to meet performance specifications
from 0°C to 85°C operating 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 LTC3774I is guaranteed to meet performance specifications over the
full –40°C to 125°C operating junction temperature range. The maximum
ambient temperature consistent with these specifications is determined by
specific operating conditions in conjunction with board layout, the package
thermal impedance and other environmental factors.
TJ is calculated from the ambient temperature, TA, and power dissipation,
PD, according to the following formula:
LTC3774UHE: TJ = TA + (PD • 43°C/W)
Note 3: The LTC3774 is tested in a feedback loop that servos VITH to a
specified voltage and measures the resultant VFB.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Guaranteed by design.
3774f
4
For more information www.linear.com/LTC3774
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