参数资料
| 型号： | MAX8940EXK28+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.8V .12A 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： | 2.8V |
| 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： | 120mA（最小） |
| 电流 - 限制（最小）： | 130mA |
| 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 |
| 产品目录页面： | 1411 (CN2011-ZH PDF) |
| 其它名称： | MAX8940EXK28+TDKR |
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
the temperature difference between the die junction
and ambient, and the rate of airflow. The power dissi-
pation 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 MAX8940 die junction and the surrounding air, θ JC
is the thermal resistance of the package, and θ CA is the
thermal resistance through the PC board, copper
traces, and other materials to the surrounding air.
The GND pin of the MAX8940 performs the dual func-
tion of providing an electrical connection to ground and
channeling heat away. Connect the GND pin to ground
using a large pad or ground plane.
Noise Reduction
For the MAX8940, an external 0.01μF bypass capacitor
between BP and OUT with innovative noise bypass
scheme reduces output noises dramatically, exhibiting
25μV RMS of output voltage noise with C BP = 0.01μF
and C OUT = 1μF. Startup time is minimized by a power-
on circuit that precharges the bypass capacitor.
Applications Information
Capacitor Selection
and Regulator Stability
Use a 1μF capacitor on the MAX8940 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 tempera-
tures 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.
Use a 0.01μF bypass capacitor at BP for low-output volt-
age noise. The leakage current going into the BP pin
should be less than 10nA. Increasing the capacitance
slightly decreases the output noise. Values above 0.1μF
and below 0.001μF are not recommended.
Noise, PSRR, and Transient Response
The MAX8940 is designed to deliver low noise and high
PSRR, as well as low dropout and low quiescent cur-
rents in battery-powered systems. The MAX8940
power-supply rejection is 65dB at 1kHz.
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 MAX8940 line- and load-transient responses.
Dropout Voltage
A regulator’s minimum dropout voltage determines the
lowest usable supply voltage. In battery-powered sys-
tems, this determines the useful end-of-life battery volt-
age. Because the MAX8940 uses a p-channel MOSFET
pass transistor, the dropout voltage is a function of drain-
to-source on-resistance (RDS(ON)) multiplied by the
load current (see the Typical Operating Characteristics).
Chip Information
TRANSISTOR COUNT: 284
PROCESS: BiCMOS
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8940EXK30+T | 功能描述:线性稳压器 - 标准 PSRR 120mA Linear Regulator RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8942EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVKIT FOR MAX8942EWN+ - Boxed Product (Development Kits) |
| MAX8949EVKIT+ | 制造商:Maxim Integrated Products 功能描述:PMIC FOR BROADCOM 3G SMART PHONE - Boxed Product (Development Kits) |
| MAX8949EWG+T | 制造商:Maxim Integrated Products 功能描述:PMIC FOR BROADCOM 3G SMART PHONE - Tape and Reel |
| MAX8949QEWG+T | 制造商:Maxim Integrated Products 功能描述:PMIC FOR BROADCOM 3G SMART PHONE - Tape and Reel |
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