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| 型号： | LTC3634EUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 23/28页 |
| 文件大小： | 359K |
| 代理商： | LTC3634EUFD#TRPBF |
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LTC3634
4
3634f
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 4). VIN = 12V, INTVCC = 3.3V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ITRACKSS
TRACKSS Pull-Up Current
1.4
A
Phase Shift Between Channel 1 and
Channel 2
PHMODE = 0V
PHMODE = INTVCC
90
180
deg
PHMODE Threshold Voltage
VIH
VIL
1
0.3
V
MODE/SYNC Threshold Voltage
VIH
VIL
1
0.4
V
SYNC Threshold Voltage
VIH
0.95
V
MODE/SYNC Input Current
MODE = 0V
MODE = INTVCC
1.5
–1.5
A
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: Transient event duration must be < 1% of total lifetime of the part.
Note 3: Guaranteed by long term current density limitations.
Note 4: The LTC3634 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3634E is guaranteed to meet specified performance
from 0°C to 85°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
LTC3634I is guaranteed to meet 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 rated package thermal
impedance and other environmental factors.
Note 5: The junction temperature (TJ, in °C) is calculated from the ambient
temperature (TA, in °C), package thermal impedance (θJA, in °C/W), and
power dissipation (PD, in Watts) according to the formula: TJ = TA + PD θJA.
Note 6: Output voltage settings above 3V are not optimized for controlled
on-time operation. For designs that set output voltages above 3V, please
refer to the Applications Information section for information on device
operation outside the optimized range.
Note 7: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Typical perForMance characTerisTics T
A = 25°C, VIN = 12V, fSW = 1MHz, L = 1.5μH unless
otherwise noted.
Efficiency vs Load Current
(Burst Mode Operation)
Efficiency vs Load Current
(Forced Continuous)
Efficiency vs Load Current
(Forced Continuous)
0.001
EFFICIENCY
(%)
10
20
10
3634 G01
0
30
40
50
60
70
80
100
90
1
0.01
0.1
LOAD CURRENT (A)
VOUT = 1.8V
VIN = 4V
VIN = 8V
VIN = 12V
VIN = 15V
0.001
EFFICIENCY
(%)
10
20
10
3634 G02
0
30
40
50
60
70
80
100
90
1
0.01
0.1
LOAD CURRENT (A)
VIN = 4V
VIN = 8V
VIN = 12V
VIN = 15V
VOUT = 1.8V
0.001
EFFICIENCY
(%)
10
20
10
3634 G03
0
30
40
50
60
70
80
100
90
1
0.01
0.1
LOAD CURRENT (A)
VOUT = 1.5V
VIN = 4V
VIN = 8V
VIN = 12V
VIN = 15V
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