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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)： | 15/23頁 |
| 文件大?。?/td> | 479K |
| 代理商： | MAX15009 |
Applications Information
Load Dump
Most automotive applications run off a multicell 12V
lead-acid battery with a nominal voltage that swings
between 9V and 16V, depending on load current,
charging status, temperature, and battery age, etc. The
battery voltage is distributed throughout the automobile
and is locally regulated down to voltages required by
the different system modules. Load dump occurs when
the alternator is charging the battery and the battery
becomes disconnected. Power in the alternator (behav-
ing now essentially as an inductor) flows into the dis-
tributed power system and elevates the voltage seen at
each module. The voltage spikes have rise times typi-
cally greater than 5ms and decay within several hun-
dred milliseconds but can extend out to 1s or more
depending on the characteristics of the charging sys-
tem. These transients are capable of destroying semi-
conductors on the first fault event.
The MAX15009/MAX15011 feature load-dump transient
protection up to +45V.
Setting the Output Voltage
The MAX15009/MAX15011 feature dual-mode opera-
tion: these devices operate in either a preset voltage
mode or an adjustable mode. In preset voltage mode,
internal feedback resistors set the linear regulator out-
put voltage (V
OUT_LDO
) to 5V. To select the preset 5V
output voltage, connect FB_LDO to SGND.
To select an adjustable output voltage between 1.8V
and 11V, use two external resistors connected as a
voltage-divider to FB_LDO (Figure 3). Set the output
voltage using the following equation:
V
OUT_LDO
= V
FB_LDO
x (R
1
+ R
2
) / R
2
where V
FB_LDO
= 1.235V and R
2
≤
50k
Ω
.
Setting the
RESET
Timeout Period
The reset timeout period is adjustable to accommodate
a variety of applications. Set the reset timeout period by
connecting a capacitor, C
RESET
, between CT and
SGND. Use the following formula to select the reset
timeout period, t
RESET
:
t
RESET
= C
RESET
x V
CT_TH
/ I
CT
where t
RESET
is in seconds and C
RESET
is in μF.
V
CT_TH
is the CT ramp threshold in volts and I
CT
is the
CT ramp current in μA, as described in the Electrical
Characteristics table.
M
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
______________________________________________________________________________________
15
IN
R1
R2
V
IN
FB_LDO
SGND
OUT_LDO
MAX15009
MAX15011
Figure 3. Setting the LDO Output Voltage
Table 1. EN_LDO/
HOLD
Truth/State Table
OPERATION STATE
EN_LDO
HOLD
OUT_LDO
COMMENT
Initial State
Low
Don’t care
OFF
EN_LDO is pulled to SGND through an internal pulldown.
HOLD
is unconnected and is internally pulled up to OUT_LDO. The
regulator is disabled.
Turn-On State
High
Don’t care
ON
EN_LDO is externally driven high turning regulator on.
HOLD
is
pulled up to OUT_LDO.
Hold Setup State
High
Low
ON
HOLD
is externally pulled low while EN_LDO remains high
(latches EN_LDO state).
Hold State
Low
Low
ON
EN_LDO is driven low or left unconnected.
HOLD
remains
externally pulled low keeping the regulator on.
Off State
Low
High or
unconnected
OFF
HOLD
is driven high or left unconnected while EN_LDO is low.
The regulator is turned off and EN_LDO/
HOLD
logic returns to the
initial state.
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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 |
| 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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