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| 型号： | MAX15008ATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/24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： | 60 |
| 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）： | 0.775V @ 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： | 管件 |
Automotive 300mA LDO Voltage Regulators
with Tracker Output and Overvoltage Protector
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
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:
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 OVP = V OV × 0 . 98 × I GATEPD ×
t 1
t OVP
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-
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.
V MAX
V OV
V SOURCE
IN
GATE
+ V Q1 -
I LOAD
V SOURCE
TVS
MAX15008
SOURCE
LOAD
GATE
t 2
FB_PROT
SGND
SOURCE
t 1
t 3
t OVP
Figure 7. Power Dissipated Across MOSFETs During an
Overvoltage Fault (Overvoltage Limiter Mode)
Figure 8. MAX15008 Timing Diagram
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15008ATJ+ | 功能描述:低压差稳压器 - LDO Automotive 300mA w/Tracker 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 |
| MAX15008ATJ+T | 功能描述:低压差稳压器 - LDO Automotive 300mA w/Tracker 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 |
| MAX15008EVKIT+ | 功能描述:电源管理IC开发工具 MAX15008 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX15009ATJ+ | 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 |
| MAX15009ATJ+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 |
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