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參數(shù)資料
| 型號(hào)： | LT3640IFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 506K |
| 代理商： | LT3640IFE#TRPBF |
LT3640
3640f
pull-ups eliminate the need for external pull-ups when
the rise time of these pins is not critical. The open-drain
configuration allows wired-OR connections.
The two power-on reset timers share one oscillator. The
power-on reset timeout period, tRST (64 cycles on the
CPOR pin), which is the same for the two channels, can
be programmed by connecting a capacitor, CPOR, between
the CPOR pin and ground:
t
C
s
F
RST
POR
=
37 106
For example, using a capacitor value of 8.2nF gives a
303ms reset timeout period. The accuracy of tRST will be
limited by the accuracy and temperature coefficient of the
capacitor CPOR. Extra parasitic capacitance on the CPOR
pin, such as probe capacitance, can affect tRST.
Watchdog
The WDE pin is the enable pin for the watchdog. As soon
as both RST1 and RST2 are released, the watchdog starts
a delay period, tDLY, during which the input signal at the
WDI pin is ignored for higher reliability. After the delay
period, the watchdog starts detecting falling edges on the
WDI pin. If the time between any two WDI falling edges is
shorterthanthewatchdoglowerboundary,tWDL,orlonger
than the watchdog upper boundary, tWDU, the WDO pin
is pulled down for a period of tRST, which is the same as
the power-on reset timeout period. When the WDO pin is
released, the watchdog again starts the delay period.
The WDO is open-drain output with weak internal pull-up,
similar to the RST pins.
The delay period corresponding to 33 cycles on CWDT, the
watchdog lower boundary (4 cycles on CWDT), and the
watchdog upper boundary (64 cycles on CWDT) are all
related and set by a capacitor, CWDT, between the CWDT
pin and ground:
t
C
DLY
WDU
WDL
WDU
WDT
=
=
33
64
16
37 106
s
F
The accuracy of the watchdog timer will be limited by
the accuracy and temperature coefficient of the capacitor
CWDT. Extra parasitic capacitance on the CWDT pin, such
as probe capacitance, can affect the watchdog timer.
Figure 9. Power-On Reset and Watchdog Timing
applicaTions inForMaTion
(9a)
(9b)
(9c)
20ms/DIV
CPOR
CWDT
FB1
FB2
RST2
RST1
3640 F09a
64 CYCLES 64 CYCLES
WD STARTS
1ms/DIV
CPOR
CWDT
WDI
WDO
3640 F09b
50ms/DIV
CPOR
CWDT
WDI
WDO
3640 F09c
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3640IUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640IUFD#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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(jì)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 |
| LT3640IUFD#TRPBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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(jì)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 |
| LT3640IUFDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640IUFDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
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