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參數資料
| 型號： | BU4247F |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | ROHS COMPLIANT, SOP-4 |
| 文件頁數： | 10/11頁 |
| 文件大小： | 282K |
| 代理商： | BU4247F |
Technical Note
8/10
BU42
□□G, BU42□□F, BU42□□FVE, BU43□□G, BU43□□F, BU43□□FVE series
www.rohm.com
2009.06 - Rev.B
2009 ROHM Co., Ltd. All rights reserved.
Operation Notes
1 . Absolute maximum range
Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed. We cannot be defined the
failure mode, such as short mode or open mode. Therefore a physical security countermeasure, like fuse, is to be given
when a specific mode to be beyond absolute maximum ratings is considered.
2 . GND potential
GND terminal should be a lowest voltage potential every state.
Please make sure all pins that are over ground even if include transient feature.
3 . Electrical Characteristics
Be sure to check the electrical characteristics, that are one the tentative specification will be changed by temperature,
supply voltage, and external circuit.
4 . Bypass Capacitor for Noise Rejection
Please put into the to reject noise between VDD pin and GND with 1uF over and between VOUT pin and GND with 1000pF.
If extremely big capacitor is used, transient response might be late. Please confirm sufficiently for the point.
5 . Short Circuit between Terminal and Soldering
Don’t short-circuit between Output pin and VDD pin, Output pin and GND pin, or VDD pin and GND pin. When soldering the
IC on circuit board please is unusually cautious about the orientation and the position of the IC. When the orientation is
mistaken the IC may be destroyed.
6 . Electromagnetic Field
Mal-function may happen when the device is used in the strong electromagnetic field.
7 .
The VDD line inpedance might cause oscillation because of the detection current.
8.
A VDD -GND capacitor (as close connection as possible) should be used in high VDD line impedance condition.
9 .
Lower than the mininum input voltage makes the VOUT high impedance, and it must be VDD in pull up (VDD) condition.
10. Case of needless Delay time, recommended to insert more 470k
resister between VDD and CT.
11.
Recommended value of RL Resistar is over 50k
(VDET=1.5~4.8V),
over 100k
(VDET=0.9~1.4V).
12. This IC has extremely high impedance terminals. Small leak current due to the uncleanness of PCB surface might cause
unexpected operations. Application values in these conditions should be selected carefully. If 10M
leakage is assumed
between the CT terminal and the GND terminal, 1M
connection between the CT terminal and the VDD terminal would be
recommended. Also, if the leakage is assumed between the VOUT terminal and the GND terminal, the pull up resistor
should be less than 1/10 of the assumed leak resistance.
The value of RCT depends on the external resistor that is connected to CT terminal, so please consider the delay time that
is decided by
τ × RCT × CCT changes.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| BU4247F-TR | 功能描述:電壓監(jiān)測器/監(jiān)控器 LOW VOLT DETEC VOLT 0.9V RoHS:否 制造商:Texas Instruments 監(jiān)測電壓數:2 監(jiān)測電壓:Adjustable 輸出類型:Open Drain 欠電壓閾值: 過電壓閾值: 準確性:1 % 工作電源電壓:1.5 V to 6.5 V 工作電源電流:1.8 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SON-6 安裝風格:SMD/SMT |
| BU4247FVE | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
| BU4247FVE-TR | 功能描述:電壓監(jiān)測器/監(jiān)控器 LOW VOLT DETEC VOLT 0.9V RoHS:否 制造商:Texas Instruments 監(jiān)測電壓數:2 監(jiān)測電壓:Adjustable 輸出類型:Open Drain 欠電壓閾值: 過電壓閾值: 準確性:1 % 工作電源電壓:1.5 V to 6.5 V 工作電源電流:1.8 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SON-6 安裝風格:SMD/SMT |
| BU4247G | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
| BU4247G-TR | 功能描述:電壓監(jiān)測器/監(jiān)控器 CMOS LOW VOLT DETEC RoHS:否 制造商:Texas Instruments 監(jiān)測電壓數:2 監(jiān)測電壓:Adjustable 輸出類型:Open Drain 欠電壓閾值: 過電壓閾值: 準確性:1 % 工作電源電壓:1.5 V to 6.5 V 工作電源電流:1.8 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SON-6 安裝風格:SMD/SMT |
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