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參數(shù)資料
| 型號(hào)： | MAX6349SHUT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 固定／可調(diào)正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器 |
| 英文描述： | Analog IC |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.36 V DROPOUT, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 428K |
| 代理商： | MAX6349SHUT-T |
MAX6329/MAX6349
logic low on MR asserts reset while the regulator is still
within tolerance.
Reset remains asserted while MR is low and for the
reset timeout period (100ms min) after MR returns high.
The MR input has an internal pullup of 20k
(typ) to
OUT. This input can be driven with TTL/CMOS logic
levels or with open-drain/collector outputs. Connect a
normally open momentary switch from MR to GND to
create a manual reset function; external debounce cir-
cuitry is not required. If MR is driven from long cables
or the device is used in a noisy environment, connect a
0.1F capacitor from MR to GND to provide additional
noise immunity.
Reverse Leakage Protection
An internal circuit monitors the input and output volt-
ages. When the output voltage is greater than the input
voltage, the internal pass transistor and parasitic
diodes turn off. OUT powers the device. There is no
leakage path from OUT to IN. Therefore, the output can
be powered from an auxiliary supply such as a backup
battery without any need for additional blocking diodes.
Current Limit
The MAX6329/MAX6349 include a current limiter that
monitors and controls the pass transistor’s gate voltage,
limiting the output current to 350mA (typ). The output can
be shorted to ground for an indefinite period without
damaging the part.
Thermal Overload Protection
When the junction temperature exceeds TJ = +160°C,
the thermal sensor signals the shutdown logic, turning
off the pass transistor and allowing the IC to cool. The
thermal sensor will turn the pass transistor on again
after the IC’s junction temperature cools by 20°C,
resulting in a pulsed output during continuous thermal-
overload conditions. Thermal overload protection is
designed to protect the MAX6329/MAX6349 in the
event of fault conditions. For continuous operation, do
not exceed the absolute maximum junction temperature
rating of TJ = +150°C.
Operating Region and Power Dissipation
The MAX6329/MAX6349s’ maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and the ambient air, and the rate of airflow.
The power dissipation across the device is:
P = IOUT (VIN - VOUT)
The maximum power dissipation is:
PMAX = (TJ - TA) / (
θJB + θBA)
where TJ - TA is the temperature difference between the
die junction and the surrounding air,
θJB (or θJC) is the
thermal resistance of the package, and
θBA is the ther-
mal resistance through the printed circuit board, copper
traces, and other materials to the surrounding air.
The MAX6329/MAX6349s’ ground pin (GND) performs
the dual function of providing an electrical connection
to the system ground and channeling heat away.
Connect GND to the system ground using a large pad
or ground plane.
Applications Information
Output Voltage Selection
The MAX6329/MAX6349 feature dual mode operation:
they operate in either a preset voltage mode or an
adjustable mode. In preset voltage mode, internal
feedback resistors set the MAX6329/MAX6349 to
+3.3V, +2.5V, or +1.8V (see Selector Guide). Select this
mode by connecting SET to ground. In adjustable
mode, select an output between 1.23V to 5.0V using
two external resistors connected as a voltage divider to
SET (Figure 1). The output voltage is set by the following
equation:
VOUT = VSET (1 + R1/R2)
where VSET = 1.23V. To simplify resistor selection:
R1 = R2 (VOUT/VSET - 1)
Choose R2
≥ 100k to optimize power consumption,
accuracy, and high-frequency power-supply rejection.
Since the VSET tolerance is typically less than ±30mV,
the output can be set using fixed resistors instead of
variable resistors. In preset voltage mode, impedance
between SET and ground should be less than 50k
.
150mA, SOT23, Low Dropout Linear Regulators
with Internal Microprocessor Reset Circuit
8
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| MAX636BCSA-T | 0.525 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| MAX6381XR42D2-T | Analog IC |
| MAX6382XR43D1-T | SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6349SL | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Circuit |
| MAX6349SLUT | 制造商:Maxim Integrated Products 功能描述:150MA SOT23 LOW-DROPOUT LINEAR RE - Cut Tape Product |
| MAX6349SLUT-T | 功能描述:低壓差穩(wěn)壓器 - LDO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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 |
| MAX6349SP | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Circuit |
| MAX6349SPUT | 制造商:Maxim Integrated Products 功能描述:150MA SOT23 LOW-DROPOUT LINEAR RE - Cut Tape Product |
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