參數(shù)資料
型號(hào)： MAX15010
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(chē)電子的300mA LDO穩(wěn)壓器，提供跟蹤輸出和過(guò)壓保護(hù)
文件頁(yè)數(shù)： 14/23頁(yè)
文件大?。?/td> 479K
代理商： MAX15010
M
Automotive 300mA LDO Voltage Regulators
with Tracker Output and Overvoltage Protector
14
______________________________________________________________________________________
Overvoltage-Limiter Mode
When operating in overvoltage-limiter mode, the feed-
back path consists of SOURCE, FB_PROT’s internal
comparator, the internal gate charge pump/gate pull-
down, and the external n-channel MOSFET (Figure 2).
This configuration results in the external MOSFET oper-
ating as a hysteretic voltage regulator.
During normal operation, GATE is enhanced 8.1V
above V
IN
. The external MOSFET source voltage is
monitored through a resistive voltage-divider between
SOURCE and FB_PROT. When V
SOURCE
exceeds the
adjustable overvoltage threshold, an internal pulldown
switch discharges the gate voltage and quickly turns
the MOSFET off. Consequently, the source voltage
begins to fall. The V
SOURCE
fall time is dependent on
the MOSFET’s gate charge, the internal charge-pump
current, the output load, and any load capacitance at
SOURCE. When the voltage at FB_PROT is below the
overvoltage threshold by an amount equal to the hys-
teresis, the charge pump restarts and turns the
MOSFET back on. In this way, the OVP controller
attempts to regulate V
SOURCE
around the overvoltage
threshold. SOURCE remains high during overvoltage
transients and the MOSFET continues to conduct dur-
ing an overvoltage event. The hysteresis of the
FB_PROT comparator and the gate turn-on delay force
the external MOSFET to operate in a switched on/off
sequence during an overvoltage event.
Exercise caution when operating the MAX15008 in
voltage-limiting mode for long durations. Care must be
taken against prolonged or repeated exposure to
overvoltage events while delivering large amounts of
load current as the power dissipation in the external
MOSFET may be high under these conditions. To pre-
vent damage to the MOSFET, implement proper
heatsinking. The capacitor connected between
SOURCE and ground can also be damaged if the rip-
ple current rating for the capacitor is exceeded.
As the transient voltage decreases, the voltage at
SOURCE falls. For fast-rising transients and very large
MOSFETs, connect an additional capacitor from GATE
to PGND. This capacitor acts as a voltage-divider work-
ing against the MOSFET’s drain-to-gate capacitance. If
using a very low gate charge MOSFET, additional
capacitance from GATE to ground might be required to
reduce the switching frequency.
Control Logic
The MAX15008/MAX15010 LDO features two logic
inputs, EN_LDO and
HOLD
, making these devices suit-
able for automotive applications. For example, when
the ignition key signal drives EN_LDO high, the regula-
tor turns on and remains on even if EN_LDO goes low,
as long as
HOLD
is forced low and stays low after initial
regulator power-up. In this state, releasing
HOLD
turns
the regulator output (OUT_LDO) off. This feature makes
it possible to implement a self-holding circuit without
external components. Forcing EN_LDO low and
HOLD
high (or unconnected) places the regulator into shut-
down mode reducing the supply current to less than
16μA. Table 1 shows the state of OUT_LDO with
respect to EN_LDO and
HOLD
. Leave
HOLD
uncon-
nected or connect directly to OUT_LDO to allow the
EN_LDO input to act as a standard on/off logic input for
the regulator.
IN
V
IN
FB_PROT
SGND
GATE
SOURCE
PROTECTOR
OUTPUT
MAX15008
Figure 2. Overvoltage Limiter (MAX15008)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX15010ATJ+ 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(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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15010ATJ+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(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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15011ATJ+ 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15011ATJ+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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15012AASA+ 功能描述:功率驅(qū)動(dòng)器IC 175V/2A High-Speed Half-B MOSFET Drvr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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