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參數(shù)資料
| 型號(hào)： | MC33997 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switching Power Supply with Linear Regulators(帶線性穩(wěn)壓器的開(kāi)關(guān)電源) |
| 中文描述： | 開(kāi)關(guān)電源與線性穩(wěn)壓器（帶線性穩(wěn)壓器的開(kāi)關(guān)電源） |
| 文件頁(yè)數(shù)： | 14/20頁(yè) |
| 文件大?。?/td> | 454K |
| 代理商： | MC33997 |
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33997
14
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Power-On Reset Timer
This timer starts to time out at the end of the soft-start period
if the V
DDH
and V
DDL
outputs are in the valid regulation range.
If the timer “times out”, then the open-drain PWROK signal is
released, indicating that “power is ON”.
Supervisory Circuits PWROK and VKAMOK
The 33997 has two voltage monitoring open-drain outputs,
the PWROK and the VKAMOK pins. PWROK is "active high".
This output is pulled low when either of the regulator outputs
(V
DDH
or V
DDL
) are below their regulation windows. If both
regulator outputs are above their respective lower thresholds,
and the Power-On Reset Timer has expired, the output driver is
turned off and this pin is at high-impedance state (see
Figure 6
).
The VKAMOK signal indicates a severe fault condition on
the keep-alive regulator output V
KAM
. The V
KAM
output voltage
is compared to the internal bandgap reference voltage. When
the V
KAM
falls below the bandgap reference voltage level, the
VKAMOK signal is pulled low.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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| MC33997DW | 功能描述:IC SWITCH 3.3/5V SUPPLY 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| MC33997DWR2 | 制造商:Rochester Electronics LLC 功能描述:MLPS 3.3 IC - Bulk |
| MC33999EK | 功能描述:多路器開(kāi)關(guān) IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MC33999EK | 制造商:Freescale Semiconductor 功能描述:IC SWITCH 16 OUT SPI/PWM 54SOIC |
| MC33999EKR2 | 功能描述:多路器開(kāi)關(guān) IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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