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| 型号： | MAX15009ATJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ .3A 32TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 5V，1.8 V ~ 11 V |
| 输入电压： | 5 V ~ 40 V |
| 电压 - 压降（标准）： | 0.8V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 电流 - 限制（最小）： | 330mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
Detailed Description
The MAX15009/MAX15011 integrate a 300mA LDO
voltage regulator, a current-limited switched output,
and an OVP controller (MAX15009 only). These devices
operate over a wide supply voltage range from 5V to
40V and are able to withstand load-dump transients up
to 45V.
The MAX15009/MAX15011 feature a 300mA LDO regu-
lator that consumes 70μA of current under light-load
conditions and feature a fixed 5V or an adjustable out-
put voltage (1.8V to 11V). Connect FB_LDO to ground
to select a fixed 5V output voltage or select the LDO
output voltage by connecting an external resistive volt-
age-divider at FB_LDO. The regulator sources at least
300mA of current and includes a current limit of 330mA
(min). Enable the LDO by pulling EN_LDO high.
The switch features accurate current-limit sensing cir-
cuitry and is capable of controlling remote loads. Once
enabled, an internal charge pump generates the over-
drive voltage for an internal MOSFET. The switch then
starts to conduct and OUT_SW is charged up to
V OUT_LDO . The switch is enabled when the output volt-
age of the LDO is above the RESET threshold voltage
(92.5% of the LDO nominal output value).
An overcurrent condition exists when the current at
OUT_SW, I OUT_SW , exceeds the 200mA (typ) internal
factory-set current-limit threshold or the externally
adjustable current-limit threshold. During a continuous
overcurrent event, the capacitor connected at
OC_DELAY, C OC_DELAY , is charged up to a voltage of
1.235V with a current, I OC_DELAY_UP . When this voltage
is reached, an overcurrent latch is set and the gate of
the internal MOSFET is discharged, reducing I OUT_SW .
C OC_DELAY is then discharged through a pulldown cur-
rent, I OC_DELAY_DOWN (I OC_DELAY_UP / 16) and the
internal MOSFET remains off until C OC_DELAY has been
discharged to 0.1V. After this user-programmable turn-
GATE Voltage (MAX15009 Only)
The MAX15009 uses a high-efficiency charge pump to
generate the GATE voltage for the external n-channel
MOSFET. Once the input voltage, V IN , exceeds the
undervoltage lockout (UVLO) threshold, the internal
charge pump fully enhances the external n-channel
MOSFET. An overvoltage condition occurs when the
voltage at FB_PROT goes above the threshold voltage,
V TH_PROT . After V TH_PROT is exceeded, GATE is quick-
ly pulled to PGND with a 63mA pulldown current. The
MAX15009 includes an internal clamp from GATE to
SOURCE that ensures that the voltage at GATE never
exceeds one diode drop below SOURCE during gate
discharge. The voltage clamp also prevents the GATE-
to-SOURCE voltage from exceeding the absolute maxi-
mum rating for the V GS of the external MOSFET in case
the source terminal is accidentally shorted to 0V.
Overvoltage Monitoring (MAX15009 Only)
The OVP controller monitors the voltage at FB_PROT
and controls an external n-channel MOSFET, isolating,
or limiting the load during an overvoltage condition.
Operation in OVP switch mode or limiter mode
depends on the connection between FB_PROT and the
external MOSFET.
Overvoltage Switch Mode
When operating in OVP switch mode, the FB_PROT
divider is connected to the drain of the external MOS-
FET. The feedback path consists of the voltage-divider
tapped at FB_PROT, FB_PROT’s internal comparator,
the internal gate charge pump/gate pulldown, and the
external n-channel MOSFET (Figure 1). When the pro-
grammed overvoltage threshold is exceeded, the inter-
nal comparator quickly pulls GATE to ground and turns
off delay, the switch turns back on. This charge/
V IN
IN
GATE
discharge is repeated if the overcurrent condition per-
sists. The switch returns to normal operation once the
overcurrent condition has been removed.
MAX15009
PROTECTOR
The OVP controller (MAX15009 only) relies on an exter-
nal MOSFET with adequate voltage rating (V DSS ) to
FB_PROT
SOURCE
OUTPUT
protect downstream circuitry from overvoltage tran-
sients. The OVP controller drives the gate of the exter-
nal n-channel MOSFET, and is configurable to operate
as an overvoltage protection switch or as a closed-loop
SGND
voltage limiter.
Figure 1. Overvoltage-Limiter Switch Configuration (MAX15009)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15009ATN+ | 功能描述:低压差稳压器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX15009ATN+T | 功能描述:低压差稳压器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1500VETN | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1500WETN | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1501 | 制造商:Technical Pro 功能描述:Passive Two Way Molded ABS 15" PA/DJ Speaker - 1200W Max 制造商:TECHNICAL PRO 功能描述:DWO PA/DJ PROFESSIONAL SPEAKERTWO WAY 15 INCH 1200W MAX |
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