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| 型号： | MAX8840ELT15+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V .15A 6-UDFN |
| 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 |
| 输出电压： | 1.5V |
| 输入电压： | 2 V ~ 6 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 电流 - 限制（最小）： | 150mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN |
| 供应商设备封装： | 6-uDFN（1.5x1.0） |
| 包装： | 带卷 (TR) |
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in μDFN
For design purposes, consider the current limit to be
150mA (min) to 300mA (max). The output can be shorted
to ground for an indefinite amount of time without dam-
aging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the MAX8840/MAX8841/MAX8842. When the junction
temperature 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
temperature drops by 10°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8840/MAX8841/MAX8842 in the event of a fault
condition. For continual operation, do not exceed the
absolute maximum junction temperature rating of T J =
+150°C.
Operating Region and Power Dissipation
The MAX8840/MAX8841/MAX8842 maximum power
dissipation depends on the thermal resistance of the
case and circuit 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 MAX8840/MAX8841/MAX8842 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 MAX8840/MAX8841/MAX8842 per-
forms the dual function of providing an electrical con-
nection to ground and channeling heat away. Connect
the GND pin to ground using a large pad or ground
plane.
Noise Reduction
For the MAX8840, an external 0.01μF bypass capacitor
between BP and OUT with an innovative noise bypass
scheme reduces output noises dramatically, exhibiting
11μV 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 MAX8840/MAX8841/
MAX8842 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 .
Use a 0.01μF bypass capacitor at BP (MAX8840) for
low-output voltage 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 MAX8840/MAX8841/MAX8842 are designed to
deliver ultra-low noise and high PSRR, as well as low
dropout and low quiescent currents in battery-powered
systems. The MAX8840 power-supply rejection is 78dB
at 1kHz and 54dB at 100kHz. The MAX8841/MAX8842
PSRR is 72dB at 1kHz and 46dB at 100kHz (see the
Power-Supply Rejection Ratio vs. Frequency graph in
the Typical Operating Characteristics) .
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 MAX8840/MAX8841/MAX8842 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 MAX8840/MAX8841/MAX8842 use a
p-channel MOSFET pass transistor, their dropout voltage
is a function of drain-to-source on-resistance (R DS(ON) )
multiplied by the load current (see the Typical Ope-
rating Characteristics ).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8840ELT16+T | 功能描述:低压差稳压器 - LDO PSRR 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 |
| MAX8840ELT18+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 1.8V 0.15A 6PIN UDFN - Rail/Tube |
| MAX8840ELT18+T | 功能描述:低压差稳压器 - LDO PSRR 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 |
| MAX8840ELT19+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 1.9V 0.15A 6PIN UDFN - Rail/Tube |
| MAX8840ELT19+T | 功能描述:低压差稳压器 - LDO PSRR 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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