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参数资料
| 型号： | MAX8840ELT19+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.9V .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： | 1.9V |
| 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
Pin Description
MAX8840
1
2
3
4
—
5
6
PIN
MAX8841
1
2
3
—
—
4, 5
6
MAX8842
1
2
3
—
4
5
6
NAME
IN
GND
SHDN
BP
FB
N.C.
OUT
FUNCTION
Unregulated Input Supply
Ground
Shutdown. Pull low to disable the regulator.
Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor
from BP to OUT. It is shorted to OUT in shutdown mode.
Adjustable Output Feedback Point
No Connection. Not internally connected.
Regulated Output Voltage. Bypass with a capacitor to GND. See the
Capacitor Selection and Regulator Stability section.
Detailed Description
The MAX8840/MAX8841/MAX8842 are ultra-low-noise,
low-dropout, low-quiescent current linear regulators
designed for space-restricted applications. The parts
are available with preset output voltages ranging from
1.5V to 4.5V. These devices can supply loads up to
150mA. As shown in the Functional Diagram , the
MAX8840/MAX8841 consist of an innovative bandgap
core and noise bypass circuit, error amplifier, p-chan-
nel pass transistor, and internal feedback voltage-
divider. The MAX8842 allows for adjustable output with
an external feedback network.
The 1.225V bandgap reference is connected to the
error amplifier’s inverting input. The error amplifier com-
pares this reference with the feedback voltage and
reduces quiescent current. pnp-based regulators waste
considerable current in dropout when the pass transis-
tor saturates. They also use high base-drive current
under heavy loads. The MAX8840/MAX8841/MAX8842
do not suffer from these problems and consume only
40μA of quiescent current in light load and 220μA in
dropout (see the Typical Operating Characteristics ).
Output Voltage Selection
The MAX8840/MAX8841 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see the Ordering Information ). The MAX8842 features
a user-adjustable output through an external feedback
network (see the Typical Operating Circuits ).
To set the output of the MAX8842, use the following
equation:
R 1 = R 2 X ?
- 1 ?
amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled low. This allows more current to pass to
? V OUT
? V REF
?
?
the output and increases the output voltage. If the feed-
back voltage is too high, the pass transistor gate is
pulled high, allowing less current to pass to the output.
The output voltage is fed back through an internal resis-
tor voltage-divider connected to the OUT pin.
An external bypass capacitor connected to BP
(MAX8840) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
Internal p-Channel Pass Transistor
The MAX8840/MAX8841/MAX8842 feature a 1 ? (typ)
p-channel MOSFET pass transistor. This provides seve-
ral advantages over similar designs using a pnp pass
transistor, including longer battery life. The p-channel
MOSFET requires no base drive, which considerably
where R2 is chosen to be less than 240k ? and V REF =
1.225V. Use 1% or better resistors.
Shutdown
The MAX8840/MAX8841/MAX8842 feature a low-power
shutdown mode that reduces quiescent current less
than 1μA. Driving SHDN low disables the voltage refer-
ence, error amplifier, gate-drive circuitry, and pass
transistor (see the Functional Diagram ), and the device
output enters a high-impedance state. Connect SHDN
to IN for normal operation.
Current Limit
The MAX8840/MAX8841/MAX8842 include a current
limiter, which monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 200mA.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8840ELT21+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 1.6V 0.15A 6PIN UDFN - Rail/Tube |
| MAX8840ELT21+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 |
| MAX8840ELT25+T | 制造商:Maxim Integrated Products 功能描述:IC REG LDO ADJ 0.2A 6UDFN |
| MAX8840ELT26+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8840ELT26+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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