參數(shù)資料
型號： MAX15009
廠商： Maxim Integrated Products, Inc.
英文描述： Automotive 300mA LDO Regulators with Switched Output and Overvoltage Protector
中文描述： 用于汽車電子的300mA LDO穩(wěn)壓器，提供可切換輸出和過壓保護(hù)
文件頁數(shù)： 17/23頁
文件大小： 479K
代理商： MAX15009
Use the following formula to calculate R
4
:
R
4
= V
TH_PROT
x R
TOTAL
/ V
OV
where V
TH_PROT
is the 1.235V FB_PROT rising threshold
and V
OV
is the desired overvoltage threshold. R
4
= 124k
Ω
:
R
TOTAL
= R
3
+ R
4
where R
3
= 1.88M
Ω
. Use a standard 1.87M
Ω
resistor.
A lower value for total resistance dissipates more
power, but provides better accuracy and robustness
against external disturbances.
Input Transients Clamping
When the external MOSFET is turned off during an
overvoltage event, stray inductance in the power path
may cause additional input-voltage spikes that exceed
the V
DSS
rating of the external MOSFET or the absolute
maximum rating for the MAX15009. Minimize stray
inductance in the power path using wide traces and
minimize the loop area included by the power traces
and the return ground path.
For further protection, add a zener diode or transient
voltage suppressor (TVS) rated below the absolute
maximum rating limits (Figure 5).
External MOSFET Selection
Select the external MOSFET with adequate voltage rating,
V
DSS
, to withstand the maximum expected load-dump
input voltage. The on-resistance of the MOSFET,
R
DS(ON)
, should be low enough to maintain a minimal
voltage drop at full load, limiting the power dissipation
of the MOSFET.
During regular operation, the power dissipated by the
MOSFET is:
P
NORMAL
= I
LOAD
2
x R
DS(ON)
Normally, this power loss is small and is safely handled
by the MOSFET. However, when operating the
MAX15009 in overvoltage limiter mode under pro-
longed or frequent overvoltage events, select an exter-
nal MOSFET with an appropriate power rating.
During an overvoltage event, the power dissipation in
the external MOSFET is proportional to both load cur-
rent and to the drain-source voltage, resulting in high
power dissipated in the MOSFET (Figure 6). The power
dissipated across the MOSFET is:
P
OV_LIMITER
= V
Q1
x I
LOAD
where V
Q1
is the voltage across the MOSFET’s drain
and source during overvoltage limiter operation, and
I
LOAD
is the load current.
M
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
______________________________________________________________________________________
17
IN
V
IN
SGND
GATE
SOURCE
TVS
MAX15009
LOAD
Figure 5. Protecting the MAX15009 Input from High-Voltage
Transients
IN
FB_PROT
SGND
GATE
SOURCE
TVS
MAX15009
LOAD
I
LOAD
+ V
Q1
-
V
SOURCE
V
SOURCE
V
OV
V
MAX
Figure 6. Power Dissipated Across MOSFETs During an
Overvoltage Fault (Overvoltage Limiter Mode)
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX15009ATJ+ 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15009ATJ+T 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15009ATN+ 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15009ATN+T 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX1500VETN 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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