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參數(shù)資料
| 型號： | MAX8863 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Pin-Compatible, Low-Dropout, 120 mA Linear Regulator |
| 中文描述： | 低壓差、120mA線性穩(wěn)壓器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 86K |
| 代理商： | MAX8863 |
MAX8863
http://onsemi.com
5
Shutdown
Low input on SHDN shuts down the MAX8863 by
turning off the pass transistor, control circuit, reference, and
all biases. This reduces the supply current to 0.1 nA, typical.
For normal operation, connect SHDN to IN. When the
MAX8863 is placed in shutdown mode, the output voltage
is actively discharged to ground.
Current Limit
The current limiter on the MAX8863 monitors and
controls the pass transistor’s gate voltage. It estimates the
output current, limiting it to 280 mA. The current limit
should be considered 150 mA (min) to 410 mA (max) for
design purposes. The output can be shorted to ground
indefinitely without damaging the device.
Thermal Overload Protection
The MAX8863 features thermal overload protection,
which limits total power dissipation. The thermal sensor
signals the shutdown logic to turn off the pass transistor
when the junction temperature exceeds T
J
= +170
°
C. This
allows the IC’s junction temperature to cool by 20
°
C before
the thermal sensor turns the pass transistor back on. This
results in a pulsed output during continuous thermal
overload conditions.
This feature is designed to protect the MAX8863 during
thermal events. High load currents and high input–output
differential voltages may cause a momentary overshoot of
2.0% to 8.0% for 200 msec when the load is removed. This
can be avoided by raising the minimum load current from
0
μ
A (+125
°
C) to 100
μ
A (+150
°
C). The maximum
junction temperature rating of +150
°
C should not be
exceeded for continuous operation.
Operating Region and Power Dissipation
The MAX8863’s maximum power dissipation depends on
the thermal resistance of the case and circuit board, the rate
of air flow, and the temperature difference between the die
junction and ambient air. The devices’ power dissipation is
P = I
OUT
(V
IN
– V
OUT
); resulting maximum power
dissipation is:
PMAX
(TJ
TA)
JA
where (T
J
– T
A
) is the temperature difference between the
devices’ die junction and the surrounding air, and
thermal resistance of the chosen package to the surrounding
air.
The devices’ GND pin provides an electrical connection
to ground and channels heat away. The GND pin should be
connected to ground with a large pad or ground plane.
JA
is the
APPLICATIONS INFORMATION
Capacitor Selection and Regulator Stability
A 1.0
μ
F capacitor on the input, and a 1.0
μ
F capacitor on
the output should generally be used on the MAX8863. For
better supply–noise rejection and transient response, larger
input capacitor values and lower ESR should be used. If the
device is several inches from the power source or if large,
fast transients are expected, a higher–value input capacitor
(10
μ
F) may be required.
Using large output capacitors may improve load–transient
response, stability, and power–supply rejection. A minimum
of 1.0
μ
F is recommended for stable operation over the full
temperature range with load currents up to 120 mA.
Noise
During normal operation, the MAX8863 have low
(350
μ
V
RMS
) output noise. The ADC’s power–supply
rejection specifications should be considered for
applications that include analog–to–digital converters of
greater than 12 bits.
Power–Supply Rejection and Operation from
Sources Other than Batteries
Power–supply rejection for the MAX8863 is 62 dB at low
frequencies, rolling off above 300 Hz. Power supply noise
rejection is primarily controlled by the output capacitor at
frequencies of more than 20 KHz.
Supply noise rejection and transient response can be
improved when operating from sources other than batteries
by increasing the values of the input and output capacitors,
and using passive filtering techniques.
Load Transient Considerations
With the MAX8863, typical overshoot for step changes in
the load current from 0 mA to 50 mA is 12 mV. To lessen
transient spikes, increase the output capacitor’s value, and
decrease its ESR.
Input–Output (Dropout) Voltage
A regulator’s dropout voltage determines the lowest
usable supply voltage. This determines the useful
end–of–life battery voltage for battery–powered systems.
Since the MAX8863 uses a P–channel MOSFET pass
transistor, the devices’ dropout voltage is a function of
R
DS(ON)
multiplied by the load current.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8863QEUK-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MAX8863REUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8863REUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.225V TO 6.5V/2.8V 0.12A 5PIN SOT-23 - Rail/Tube |
| MAX8863REUK+T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8863REUK-T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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