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參數(shù)資料
| 型號： | LT3692EUH#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 526K |
| 代理商： | LT3692EUH#PBF |
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LT3692
21
3692f
APPLICATIONS INFORMATION
the output is regulated to the reference. The SS pin voltage
will continue to rise until it is clamped at 2V.
In the event of a VIN1 undervoltage lockout, the soft-start
latch is set for both channels, triggering a full start-up
sequence. If a channel’s SHDN pin is driven below 1.3V,
its overvoltage lockout is enabled, or the internal die
temperature for its power switch exceeds its maximum
rating during normal operation, the soft-start latch is set
for that channel.
Inaddition,iftheloadexceedsthemaximumoutputswitch
current, the output will start to drop causing the VC pin
clamp to be activated. As long as the VC pin is clamped,
the SS pin will be discharged. As a result, the output will
be regulated to the highest voltage that the maximum
output current can support. For example, if a 6V output is
loaded by 1 the SS pin will drop to 0.48V, regulating the
output at 4.8V ( 4.8A 1 ). Once the overload condition
is removed, the output will soft start from the temporary
voltage level to the normal regulation point.
Since the SS pin is clamped at 2V and has to discharge
to 0.806V before taking control of regulation, momentary
overload conditions will be tolerated without a soft-start
recovery.ThetypicaltimebeforetheSSpintakescontrolis:
tSS(CONTROL) =
CSS 1.2V
1.4mA
Open-Collector Comparators
The CMPO pin is the open-collector output of an internal
comparator. The comparator compares the CMPI pin volt-
age to 90% of the reference voltage (0.72V) with 60mV
of hysteresis.
The CMPO pin has a typical sink capability of 300A when
the CMPI pin is below the threshold and can withstand 38V
when the threshold is exceeded. The CMPO pin is active
(sink capability is reduced in shutdown and undervoltage
lockoutmode)aslongastheVIN1pinvoltageexceeds2.8V.
The comparators can be used to monitor input and output
voltages as well as die temperature. See the Typical Ap-
plications circuit collection for examples.
Output Tracking/Sequencing
Complexoutputtrackingandsequencingbetweenchannels
can be implemented using the LT3692’s SS and CMPO
pins. Figure 16 shows several configurations for output
tracking/sequencing for a 3.3V and 1.8V application.
Independent soft-start for each channel is shown in Fig-
ure16a. The output ramp time for each channel is set by
thesoft-startcapacitorasdescribedinthesoft-startsection.
Ratiometric tracking is achieved in Figure 16b by con-
necting both SS pins together. In this configuration, the
SS pin source current is doubled (24A) which must be
taken into account when calculating the output rise time.
By connecting a feedback network from VOUT1 to the SS2
pin with the same ratio that sets VOUT2 voltage, absolute
tracking shown in Figure 16c is implemented. The mini-
mum value of the top feedback resistor (R1) should be set
such that the SS pin can be driven all the way to ground
with 1.4mA of sink current when VOUT1 is at its regulated
voltage. In addition, a small VOUT2 voltage offset will be
present due to the SS2 12A source current. This offset
can be corrected for by slightly reducing the value of R2.
Figure 16d illustrates output sequencing. When VOUT1 is
within 10% of its regulated voltage, CMPO1 releases the
SS2 soft-start pin allowing VOUT2 to soft-start. In this case
CMPO1 will be pulled up to 2V by the SS pin. If a greater
voltage is needed for CMPO1 logic, a pull-up resistor to
VOUT1 can be used. This will decrease the soft-start ramp
time and increase tolerance to momentary shorts.
If precise output ramp up and down is required, drive the
SS pins as shown in Figure 16e. The minimum value of
resistor (R3) should be set such that the SS pin can be
driven all the way to ground with 1.4mA of sink current
during power-up and fault conditions.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3692IUH#PBF | 功能描述:IC REG BUCK ADJ 3.5A DL 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3692IUH#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A DL 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3692IUHPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Dual Tracking 3.5A Step-Down Switching Regulator |
| LT3693 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic Dual Tracking |
| LT36931DD#PBF | 制造商:Linear Technology 功能描述: |
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