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参数资料
| 型号： | LTC3773EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 52 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 630kHz |
| 占空比： | 98.5% |
| 电源电压： | 3.3 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3773
PIN FUNCTIONS
(G/UHF)
SENSE1 + (Pin 1/Pin 34): The (+) Input to the Channel 1
Differential Current Comparator. The I TH1 pin voltage and
controlled offsets between the SENSE1 – and SENSE1 +
pins in conjunction with R SENSE set the channel 1 current
trip threshold.
SENSE1 – (Pin 2/Pin 35): The (–) Input to the Channel 1
Differential Current Comparator.
SDB/SDB1, SDB2, SDB3 (Pin 3/Pins 36, 37, 38): Shut-
down, Active Low. For G package, SDB1, SDB2 and SDB3
are shorted at the SDB pin. The power up thresholds for
channel 1, 2 and 3 are set at 1.2V, 1.8V and 2.4V respec-
tively. By pulling the SDB1, SDB2 and SDB3 pins below
0.4V, the IC is put into low current shutdown mode (I VCCQ
<30μA). There is a 0.5μA pull-up current at each SDB pin.
An external capacitor can be added at this pin to provide
power up delay.
TRACK1 (Pin 4/Pin 1): Channel 1 Tracking Input. TRACK1
is used for tracking multiple LTC3773s. See the Startup
Tracking application. To disable this feature, ?oat this pin
or tie it to V CC . TRACK1 provides a 1μA pull-up current.
An external capacitor can be added at this pin to provide
soft-start. During startup or output short-circuit condition,
if the potential at TRACK1 is less than 0.54V, current limit
foldback is disabled. When channel 1 is powered down,
this pin will be pulled low.
V FB1 (Pin 5/Pin 2): Channel 1 Error Ampli?er Feedback
Input. This pin connects the error ampli?er input to an
external resistive divider from V OUT1 .
I TH1 (Pin 6/Pin 3): Channel 1 Error Ampli?er Output and
Switching Regulator Compensation Point. The current
comparator’s threshold increases with this control volt-
age.
SGND (Pin 7/Pin 4): Signal Ground. This pin must be
routed separately under the IC to the PGND pin and then
to the main ground plane.
I TH2 (Pin 8/Pin 5): Channel 2 Error Ampli?er Output and
Switching Regulator Compensation Point. See I TH1 .
I TH3 (Pin 9/Pin 6): Channel 3 Error Ampli?er Output and
Switching Regulator Compensation Point. See I TH1 .
V FB2 (Pin 10/Pin 7): Channel 2 Error Ampli?er Feedback
Input. See V FB1 .
V FB3 (Pin 11/Pin 8): Channel 3 Error Ampli?er Feedback
Input. See V FB1 .
TRACK2 (Pin 12/Pin 9): Channel 2 Tracking Input. Tie the
TRACK2 pin to a resistive divider connected to the output
of channel 1 for either coincident or ratiometric output
tracking. See the Soft-Start/Tracking application. TRACK2
comes with a 1μA pull-up current. An external capacitor
can be added at this pin to provide soft-start. During
startup or output short-circuit condition, if the potential
at TRACK2 is less than 0.54V, current limit foldback is
disabled. When channel 2 is powered down, this pin will
be pulled low.
TRACK3 (Pin 13/Pin 10): Channel 3 Tracking Input. See
TRACK2.
SENSE2 – (Pin 14/Pin 11): The (–) Input to the Channel 2
Differential Current Comparator. See SENSE1 – .
SENSE2 + (Pin 15/Pin 12): The (+) Input to the Channel 2
Differential Current Comparator. See SENSE1 + .
SENSE3 – (Pin 16/Pin 13): The (–) Input to the Channel 3
Differential Current Comparator. See SENSE1 – .
SENSE3 + (Pin 17/Pin 14): The (+) Input to the Channel 3
Differential Current Comparator. See SENSE1 + .
V CC (Pin 18/Pin 15): Main Input Supply. All internal circuits
except the output drivers are powered from this pin. V CC
should be connected to a low noise 5V power supply and
should be bypassed to SGND with at least a 1μF capacitor
in close proximity to the LTC3773.
PLLFLTR (Pin 19/Pin 16): Phase-Locked Loop Lowpass
Filter. The phase-locked loop’s lowpass ?lter is tied to this
pin. Alternatively, when external frequency synchronizing
is not used, this pin can be forced low, left ?oating or tied
high to vary the frequency of the internal oscillator.
3773fb
10
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| LTC3775EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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