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参数资料
| 型号： | MP6401DGT-25BD3-LF-Z |
| 厂商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | FIXED POSITIVE LDO REGULATOR, PDSO6 |
| 封装： | 2 X 2 MM, MO-229WCCC, TQFN-6 |
| 文件页数： | 3/16页 |
| 文件大小： | 360K |
| 代理商： | MP6401DGT-25BD3-LF-Z |
MP6401 – 300mA LDO LINEAR REGULATOR WITH INTEGRATED RESET IC
MP6401 Rev. 0.9
www.MonolithicPower.com
11
11/2/2009
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2009 MPS. All Rights Reserved.
OPERATION
The MP6401 integrates a low noise, low dropout,
low quiescent current linear regulator and a
microprocessor reset circuit. It operates from a
2.5V to 5.5V input voltage and regulates the fixed
output voltage with 2% accuracy at 1.8V, 2.5V,
3.3V or adjustable value. The MP6401 can supply
to 300mA of load current. The internal reset
circuit is used to monitor the regulator output
voltage. The RESET asserts when the regulator
output voltage drops below the standard
microprocessor supply threshold.
Linear Regulator
The MP6401 can output a fixed voltage (1.8V,
2.5V, 3.3V options) or adjustable voltage which
ranges from 1.25V to 5V with 2.0% accuracy by
operating from a +2.5V to +5.5V input. The
MP6401 can supply up to 300mA of load current.
When ADJ is connected to GND, a fixed output
voltage is selected. Connecting ADJ pin to the tap
of external resistor divider from the OUT to GND,
adjustable output voltage is selected. The typical
ADJ connection is shown in Fig 3.
2.5V to 5.5V
IN
OUT
ADJ
EN
GND
MP6401
R1
R2
Figure 3—Output Voltage Adjusted with
Resistor Divider
Reset Function
The reset circuit monitors the OUT voltage.
RESET asserts while OUT voltage falls below its
threshold. Two OUT voltage thresholds (-7.5%
and -12.5%) are available. The power-up,
power-down, and brownout conditions will make
RESET asserted. So MP6401 monitor circuit
could right control the microprocessor. RESET
asserts when the input and output voltage below
their thresholds. RESET asserts when EN is a
low logic. When the assert trigger condition is
removed, RESET will deassert after a fixed delay
time. Four options of reset delay-time (see Table
3) can be selected.
EN Shutdown
The MP6401 can be switched ON or OFF by a
logic input at the EN pin. A high voltage at this pin
will turn the device on. When the EN pin is low,
the regulator output is off and the supply current
is reduced. Generally, the EN pin should be tied
to IN to keep the regulator output always on. Do
not float the EN pin.
Reverse Leakage Protection
An internal circuit monitors VIN and VOUT to control
the reverse leakage current from OUT to IN.
While VIN decreases lower than VOUT and EN still
hold logic high, the monitor circuit turns off the
pass element and its parasitic diode. Typically the
reverse leakage current through pass element
decreases to 0.1uA. RESET deasserts until VIN
returns greater than VOUT and VOUT is higher than
its preset threshold.
MP6401 also can work with backup battery at
OUT after input power supply is removed as
shown in Fig 4. When input power supply is
removed, RESET asserts. The backup battery
will power the device through two external diodes
and typically the current from OUT to ground is
40uA. So, the power supply removing does not
erase RAM content if the voltage of backup
battery is greater than memory’s standby
specification. The backup battery can be replaced
by a super-cap, while the diode connected with
battery is changed to a current-limiting resistor.
MP6401
IN
OUT
EN
Removable
MEMORY
uP
3.3uF
Backup
Battery
Figure 4— Maintain Memory with Backup
Battery
Current Limit
The MP6401 includes a current limit structure
which monitors and controls pass element gate
voltage limiting the guaranteed maximum output
current to 500mA.
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相关代理商/技术参数 |
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|---|---|
| MP6401DGT-33AD3-LF-P | 制造商:Monolithic Power Systems 功能描述:300MA LDO LINEAR REGULATORS WITH INTEGRATED RESET CIRCUIT - Tape and Reel 制造商:Monolithic Power Systems 功能描述:300mA LDO w/Int Reset Circuit |
| MP6401DGT-33AD3-LF-Z | 制造商:Monolithic Power Systems 功能描述:300MA LDO LINEAR REGULATORS WITH INTEGRATED RESET CIRCUIT - Tape and Reel 制造商:Monolithic Power Systems 功能描述:300mA LDO w/Int Reset Circuit |
| MP6401DGT-33BD3 | 制造商:MPS 制造商全称:Monolithic Power Systems 功能描述:300mA LDO Linear Regulator with Integrated Reset Circuit |
| MP6401DGT-33BD3-LF-P | 制造商:Monolithic Power Systems 功能描述:300MA LDO LINEAR REGULATORS WITH INTEGRATED RESET CIRCUIT - Tape and Reel 制造商:Monolithic Power Systems 功能描述:300mA LDO w/Int Reset Circuit |
| MP6401DGT-33BD3-LF-Z | 制造商:Monolithic Power Systems 功能描述:300MA LDO LINEAR REGULATORS WITH INTEGRATED RESET CIRCUIT - Tape and Reel 制造商:Monolithic Power Systems 功能描述:300mA LDO w/Int Reset Circuit |
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