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參數(shù)資料
| 型號： | MCZ33291EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Eight-Output Switch with Serial Peripheral Interface I/O |
| 中文描述： | 8輸出開關(guān)串行外設(shè)接口的I / O |
| 文件頁數(shù)： | 16/26頁 |
| 文件大小： | 379K |
| 代理商： | MCZ33291EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
16
33291
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
Figure 17. Power ON Reset
SHORT FAULT PROTECT DISABLE (SFPD)
The Short Fault Protect Disable (SFPD) pin is used to
prevent the outputs from latching-off due to an overcurrent
condition. This feature provides control of incandescent lamp
loads where in-rush currents exceed the device’s analog
current limits. Essentially the SFPD pin determines whether
the 33291 output(s) will instantly shut down upon sensing an
output short or remain ON in a current limiting mode of
operation until the output short is removed or thermal
shutdown is reached. If the SFPD pin is tied to V
DD
= 5.0 V
the 33291 output(s) will remain ON in a current limited mode
of operation upon encountering a load short to supply or
overcurrent condition. When the SFPD pin is grounded, a
short circuit will immediately shut down only the output
affected. Other outputs not having a fault condition will
operate normally. The short circuit operation is addressed in
more detail later.
POWER CONSUMPTION
The 33291 has extremely low power consumption in both
the operating and standby modes. In the standby, or
Sleep,
mode, with V
DD
≤
2.0 V, the current consumed by the VPWR
pin is less than 25
μ
A. In the operating mode, the current
drawn by the VDD pin is less than 4.0 mA (1.0 mA typical)
while the current drawn at the VPWR pin is 2.0 mA maximum
(1.0 mA typical). During normal operation, turning outputs
ON increases I
PWR
by only 20
μ
A per output. Each output
experiencing a
soft short
(overcurrent conditions just under
the current limit) adds 0.5 mA to the I
PWR
current
PARALLELING OF OUTPUTS
Using MOSFETs as output switches permits connecting
any combination of outputs together. R
DS(ON)
of MOSFETs
have an inherent positive temperature coefficient providing
balanced current sharing between outputs without
destructive operation (bipolar outputs could not be paralleled
in this fashion as thermal run-away would likely occur). The
device can even be operated with all outputs tied together.
This mode of operation may be desirable in the event the
application requires lower power dissipation or the added
capability of switching higher currents.
Performance of parallel operation results in a
corresponding decrease in R
DS(ON)
while the Output OFF
Open Load Detect Currents and the Output Current Limits
increase correspondingly (by a factor of eight if all outputs are
paralleled). Less than 125 m
R
DS(ON)
at 25
°
C with current
limiting of 8 A to 24 A will result if all outputs are paralleled
together. There will be no change in the overvoltage detect or
the OFF output threshold voltage range. The advantage of
paralleling outputs within the same 33291 affords the
existence of minimal R
DS(ON)
and output clamp voltage
variation between outputs.
Typically, the variation of R
DS(ON)
between outputs of the
same device is less than 0.5 percent. The variation in clamp
voltages, potentially affecting dynamic current sharing, is less
than five percent. Paralleling outputs from two or more
different devices is possible, but it is not recommended.
There is no guarantee the R
DS(ON)
and clamp voltage of the
two devices will match. System level thermal design analysis
and verification should be conducted whenever paralleling
outputs, particularly where different devices are involved.
+
V
DD
RDLY
C
DLY
Reset
20
μ
A
Reset
MCU
33291
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| MCZ33291EGR2 | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SERIAL SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEG | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SER SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEGR2 | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SER SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG | 功能描述:電源開關(guān) IC - 配電 OCTAL SERIAL SWITCH RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Eight Output Switch with Serial Peripheral Interface I/O |
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