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參數(shù)資料
| 型號： | LT3507HUHF#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 17/28頁 |
| 文件大?。?/td> | 302K |
| 描述： | IC REG QD BUCK/LINEAR 38-QFN |
| 產(chǎn)品培訓模塊： | More Information on LDOs |
| 標準包裝： | 2,500 |
| 拓撲： | 降壓（降壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 4 |
| 頻率 - 開關： | 900kHz ~ 1.1MHz |
| 電壓/電流 - 輸出 1： | 0.8 V ~ 32.4 V，2.4A |
| 電壓/電流 - 輸出 2： | 0.8 V ~ 32.4 V，1.5A |
| 電壓/電流 - 輸出 3： | 0.8 V ~ 32.4 V，1.5A |
| 帶 LED 驅動器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 是 |
| 電源電壓： | 4 V ~ 36 V |
| 工作溫度： | -40°C ~ 150°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 38-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 38-QFN（5x7） |
| 包裝： | 帶卷 (TR) |
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LT3507
17
3507fa
OUTPUT SEQUENCING
The LT3507 outputs can be sequenced in several ways.
The circuits in Figure 7 show some examples of these. In
each case channel 1 starts rst, followed by channel 2, then
channel 3. The sequence shown is not a requirement; the
LT3507 can sequence the channels in any order. Note that
these circuits sequence the outputs during start-up. When
shut down the three channels turn off simultaneously.
The most obvious method is to bring the RUN pins up
individually in the sequence desired (Figure 7a). This is
the ideal solution if full independent control of all three
channels is needed. This is also a simple solution, but it
does require three logic inputs.
Another possibility is to use the soft-start feature to slow
the start-up of speci c channels (Figure 7b). All three RUN
pins are tied together and the difference in soft-start ca-
pacitance will determine the start-up sequence. The larger
capacitor on channel 2 slows its start-up with respect to
channel 1, and channel 3 is even slower. The capacitor on
the delayed channel should be at least twice the value of
the capacitor on the faster channel. A larger ratio may be
required, depending on the output capacitance and load on
each channel. Make sure to test the circuit in the system
before deciding on nal values for these capacitors. Also
remember that the delayed channels will start rising right
away, just at a slower rate than the faster channels.
The PG pins can be also used to sequence the three out-
puts. In Figure 7c, the PG pins drive the RUN pins directly.
Channel 2 will be held off until channel 1 is in regulation
and channel 3 is held off until channel 2 is in regulation.
The resistors pull up to V
INSW
so that there is no current
draw in shutdown. They should be sized to provide at least
1糀 into the RUN pin. The capacitors keep channels 2 and 3
off until the power good comparators are functioning (the
power good comparators are disabled in shutdown). The
FETs are necessary to insure the RUN2 and RUN3 pins
are held low during shutdown.
In Figure 7d, the PG pins pull down the TRK/SS pins of
the delayed channels. This is a simple solution requiring
no extra components. Channel 2 is held off by the PG1
output pulling TRK/SS2 down until channel 1 is at 90% of
its nal value. PG1 then goes high impedance and allows
the channel 2 soft-start circuit to charge the soft-start
capacitor bringing channel 2 up. Similarly, channel 3 is
held off by PG2.
The circuits in Figure 7a and 7b leave the power good
indicators free. However, the circuits in Figures 7c and
7d have another advantage. As well as sequencing the
outputs at start-up, they also disable the slaved channels
APPLICATIONS INFORMATION
Figure 7. Output Sequencing
RUN1
RUN2
RUN3
TRK/SS1
TRK/SS2
TRK/SS3
LT3507
C
2C
4C
(7b)
RUN1
RUN2
RUN3
RUN1
RUN2
RUN3
LT3507
(7a)
RUN2
PG1
LT3507
V
IN
(7e)
Doesnt Work!
RUN1
RUN
RUN
V
INSW
PG1
RUN2
RUN3
PG2
3507 F07
LT3507
(7c)
RUN1
RUN2
RUN3
TRK/SS1
PG1
TRK/SS2
PG2
TRK/SS3
LT3507
(7d)
RUN
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3507IUHF#PBF | 功能描述:IC REG QD BUCK/LINEAR 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LT3507IUHF#TRPBF | 功能描述:IC REG QD BUCK/LINEAR 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LT3507IUHFPBF | 制造商:Linear Technology 功能描述:Triple Voltage Regulator QFN38EP |
| LT3507IUHF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Triple Monolithic Step-Down Regulator with LDO |
| LT3507IUHF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Triple Monolithic Step-Down Regulator with LDO |
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