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参数资料
| 型号： | MAX8511EXK32-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.2 V FIXED POSITIVE LDO REGULATOR, 0.17 V DROPOUT, PDSO5 |
| 封装： | PLASTIC, SC-70, 5 PIN |
| 文件页数： | 7/10页 |
| 文件大小： | 604K |
| 代理商： | MAX8511EXK32-T |
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70
6
_______________________________________________________________________________________
Detailed Description
The MAX8510/MAX8511/MAX8512 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 in 100mV increments. These devices can
supply loads up to 120mA. As shown in the Functional
Diagram, the MAX8510/MAX8511 consist of an innova-
tive bandgap core and noise bypass circuit, error
amplifier, P-channel pass transistor, and internal feed-
back voltage-divider. The MAX8512 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
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
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
(MAX8510) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
Internal P-Channel Pass Transistor
The MAX8510/MAX8511/MAX8512 feature a 1 (typ) P-
channel MOSFET pass transistor. This provides several
advantages over similar designs using a PNP pass
transistor, including longer battery life. The P-channel
MOSFET requires no base drive, which considerably
reduces quiescent current. PNP-based regulators
waste considerable current in dropout when the pass
transistor saturates. They also use high base-drive cur-
rent under heavy loads. The MAX8510/MAX8511/
MAX8512 do not suffer from these problems and con-
sume only 40A of quiescent current in light load and
220A in dropout (see the Typical Operating
Characteristics).
Output Voltage Selection
The MAX8510/MAX8511 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see Ordering Information). The MAX8512 features a
user-adjustable output through an external feedback
network (see the Typical Operating Circuits).
To set the output of the MAX8512, use the following
equation:
where R2 is chosen to be less than 240k and VREF =
1.225V. Use 1% or better resistors.
Shutdown
The MAX8510/MAX8511/MAX8512 feature a low-power
shutdown mode that reduces quiescent current less
than 1A. 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 MAX8510/MAX8511/MAX8512 include a current
limiter, which monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 200mA.
RR X
V
OUT
REF
12
1
=
-
Pin Description
PIN
MAX8510
MAX8511
MAX8512
NAME
FUNCTION
111
IN
Unregulated Input Supply
222
GND
Ground
333
SHDN
Shutdown. Pull low to disable the regulator.
4—
—
BP
Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from
BP to OUT. It is short to OUT in shutdown mode.
—4
—N.C.
Not Internally Connected
——
4FB
Adjustable Output Feedback Point
555
OUT
Regulated Output Voltage. Bypass with a capacitor to GND. See the
Capacitor Selection and Regulator Stability section for more details.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8511EXK33 | 制造商:Maxim Integrated Products 功能描述:LOW DROPOUT 13UV ULTRA-LOW NOISE - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8511EXK33+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 3.3V 0.12A 5PIN SC-70 - Rail/Tube |
| MAX8511EXK33+T | 功能描述:低压差稳压器 - LDO 120mA 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 |
| MAX8511EXK33-T | 功能描述:低压差稳压器 - LDO 120mA 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 |
| MAX8511EXK35+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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