參數(shù)資料
型號： MAX15008
廠商： Maxim Integrated Products, Inc.
英文描述： Automotive 300mA LDO Voltage Regulators with Tracker Output and Overvoltage Protector
中文描述： 用于汽車電子的300mA LDO穩(wěn)壓器，提供跟蹤輸出和過壓保護
文件頁數(shù)： 18/23頁
文件大?。?/td> 479K
代理商： MAX15008
M
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
MAX15008 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 7). 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.
Overvoltage-Limiter Mode
Switching Frequency
When the MAX15008 is configured in overvoltage-
limiter mode, the external n-channel MOSFET is subse-
quently switched on and off during an overvoltage
event. The output voltage at SOURCE resembles a
periodic sawtooth waveform. Calculate the period of
the waveform, t
OVP
, by summing three time intervals
(Figure 8):
t
OVP
= t
1
+ t
2
+ t
3
where t
1
is the V
SOURCE
output discharge time, t
2
is the
GATE delay time, and t
3
is the V
SOURCE
output charge time.
During an overvoltage event, the power dissipated
inside the MAX15008 is due to the gate pulldown cur-
rent, I
GATEPD
. This amount of power dissipation is
worse when I
SOURCE
= 0 (C
SOURCE
is discharged only
by the internal current sink).
The worst-case internal power dissipation contribution
in overvoltage-limiter mode, P
OVP
, in watts can be
approximated using the following equation:
where V
OV
is the overvoltage threshold voltage in volts
and I
GATEPD
is the 63mA (typ) GATE pulldown current.
Output Discharge Time (t
1
)
When the voltage at SOURCE exceeds the adjusted
overvoltage threshold, GATE’s internal pulldown is
enabled until V
SOURCE
drops by 4%. The internal cur-
rent sink, I
GATEPD
, and the external load current,
I
LOAD
, discharge the external capacitance from
SOURCE to ground.
P
V
I
t
t
OVP
OV
GATEPD
OVP
=
×
×
×
0 98
.
1
Automotive 300mA LDO Voltage Regulators
with Tracker Output and Overvoltage Protector
18
______________________________________________________________________________________
t
2
t
1
t
OVP
t
3
GATE
SOURCE
Figure 8. MAX15008 Timing Diagram
IN
FB_PROT
SGND
GATE
SOURCE
TVS
MAX15008
LOAD
I
LOAD
+ V
Q1
-
V
SOURCE
V
SOURCE
V
OV
V
MAX
Figure 7. Power Dissipated Across MOSFETs During an
Overvoltage Fault (Overvoltage Limiter Mode)
相關(guān)PDF資料
PDF描述
MAX15010 Automotive 300mA LDO Voltage Regulators with Tracker Output and Overvoltage Protector
MAX15009 Automotive 300mA LDO Regulators with Switched Output and Overvoltage Protector
MAX15011 Automotive 300mA LDO Regulators with Switched Output and Overvoltage Protector
MAX15024 Single/Dual, 16ns, High Sink/Source Current Gate Drivers
MAX15025 Single/Dual, 16ns, High Sink/Source Current Gate Drivers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX15008ATJ+ 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Tracker 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
MAX15008ATJ+T 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Tracker 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
MAX15008EVKIT+ 功能描述:電源管理IC開發(fā)工具 MAX15008 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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
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