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| 型号： | MAX8891EXK29+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.85V .15A SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.85V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.135V @ 120mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 其它名称： | MAX8891EXK29+TDKR |
MAX8891/MAX8892
High PSRR, Low-Dropout, 150mA
Linear Regulators
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the MAX8891/MAX8892. When the junction tempera-
ture exceeds T J = +160°C, the thermal sensor signals
the shutdown logic, turning off the pass transistor and
allowing the IC to cool down. The thermal sensor turns
the pass transistor on again after the IC’s junction tem-
perature drops by 10°C, resulting in a pulsed output dur-
ing continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8891/MAX8892 in the event of a fault condition. For
continual operation, do not exceed the absolute maxi-
mum junction temperature rating of T J = +150°C.
Operating Region and Power Dissipation
The MAX8891/MAX8892 maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient, and the rate of airflow. The power
dissipation across the device is:
P = I OUT (V IN - V OUT )
The maximum power dissipation is:
P MAX = (T J - T A )/( θ JC + θ CA )
where T J - T A is the temperature difference between the
MAX8891/MAX8892 die junction and the surrounding air,
θ JC is the thermal resistance of the package, and θ CA is
the thermal resistance through the PCB, copper traces,
and other materials to the surrounding air.
The GND pin of the MAX8891/MAX8892 performs the
dual function of providing an electrical connection to
ground and channeling heat away. Connect the GND
pin to ground using a large pad or ground plane.
6
Applications Information
Capacitor Selection
and Regulator Stability
Use a 1μF capacitor on the MAX8891/MAX8892 input
and a 1μF capacitor on the output. Larger input capacitor
values and lower ESRs provide better noise rejection and
line-transient response. Reduce output noise and
improve load-transient response, stability, and power-
supply rejection by using large output capacitors. Note
that some ceramic dielectrics exhibit large capacitance
and ESR variation with temperature. With dielectrics such
as Z5U and Y5V, it may be necessary to use a 2.2μF or
larger output capacitor to ensure stability at temperatures
below -10°C. With X7R or X5R dielectrics, 1μF is sufficient
at all operating temperatures. A graph of the region of
stable C OUT ESR vs. load current is shown in the Typical
Operating Characteristics.
PSRR and Transient Response
The MAX8891/MAX8892 are designed to deliver high
PSRR as well as low dropout and low quiescent currents
in battery-powered systems. The MAX8891/MAX8892
power-supply rejection is 65dB at 10kHz.
When operating from sources other than batteries,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors, and through passive fil-
tering techniques. The Typical Operating Characteristics
show the MAX8891/MAX8892 line- and load-transient
responses.
Dropout Voltage
A regulator’s minimum dropout voltage determines the
lowest usable supply voltage. In battery-powered
systems, this determines the useful end-of-life battery
voltage. Because the MAX8891/MAX8892 use a
p-channel MOSFET pass transistor, their dropout volt-
age is a function of drain-to-source on-resistance
(R DS(ON) ) multiplied by the load current (see the Typical
Operating Characteristics).
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8891EXK30+T | 功能描述:低压差稳压器 - LDO 150mA Linear Regulator 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 |
| MAX8891EXK31+T | 功能描述:低压差稳压器 - LDO 150mA Linear Regulator 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 |
| MAX8891EXK33/V+T | 功能描述:低压差稳压器 - LDO 150mA Linear Regulator 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 |
| MAX8891EXK33+ | 制造商:Maxim Integrated Products 功能描述:HIGH PSRR, LOW-DROPOUT, 150MA LINEAR REGULATORS - Rail/Tube |
| MAX8891EXK33+T | 功能描述:低压差稳压器 - LDO 150mA Linear Regulator 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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