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參數(shù)資料
| 型號： | MAX8510 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Input Positive-AND Gates 14-CDIP -55 to 125 |
| 中文描述： | 超低噪聲、高PSRR、低壓差、120mA線性穩(wěn)壓器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 604K |
| 代理商： | MAX8510 |
M
Ultra-Low-Noise, High PS RR, Low-Dropout,
120mA Linear Regulators in S C70
_______________________________________________________________________________________
7
For design purposes, consider the current limit to be
130mA (min) to 300mA (max). The output can be shorted
to ground for an indefinite amount of time without damag-
ing the part.
T hermal-Overload Protec tion
Thermal-overload protection limits total power dissipation
in the MAX8510/MAX8511/MAX8512. 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
MAX8510/MAX8511/MAX8512 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 MAX8510/MAX8511/MAX8512 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
J C
+
θ
CA
)
where T
J
- T
A
is the temperature difference between
the MAX8510/MAX8511/MAX8512 die junction and the
surrounding air,
θ
J C
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 MAX8510/MAX8511/MAX8512 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 Reduc tion
For the MAX8510, an external 0.01μF bypass capacitor
between BP and OUT with 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.
Applic ations Information
Capac itor S elec tion
and Regulator S tability
Use a 1μF capacitor on the MAX8510/MAX8511/
MAX8512 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 (MAX8510) 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 recom-
mended.
Noise, PS RR, and T ransient Response
The MAX8510/MAX8511/MAX8512 are designed to
deliver ultra-low noise and high PSRR, as well as low
dropout and low quiescent currents in battery-powered
systems. The MAX8510 power-supply rejection is 78dB
at 1kHz and 54dB at 100kHz. The MAX8511/MAX8512
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 MAX8510/MAX8511/MAX8512 line- and load-
transient responses.
Dropout V oltage
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 MAX8510/MAX8511/MAX8512 use a
P-channel MOSFET pass transistor, their dropout voltage
is a function of drain-to-source on-resistance (RDS(ON))
multiplied by the load current (see the
Typical Operating
Characteristics
).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8510ETA18+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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8510ETA25+ | 制造商:Maxim Integrated Products 功能描述:ULTRA-LOW-NOISE HIGH PSRR LOW-DROPOUT 120MA LINEAR REGULATOR - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8510ETA25+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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8510ETA28+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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8510ETA29+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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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