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參數(shù)資料
| 型號(hào)： | SC1457ISK-2.9TRT |
| 元件分類： | 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器 |
| 英文描述： | 2.9 V FIXED POSITIVE LDO REGULATOR, 0.23 V DROPOUT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 232K |
| 代理商： | SC1457ISK-2.9TRT |
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5
2004 Semtech Corp.
www.semtech.com
SC1457
POWER MANAGEMENT
Top Mark
Bottom Mark
yyww = Date code
(example: 0008 for week 8 of 2000)
Marking Information
Applications Information
Theory Of Operation
The SC1457 is intended for applications where very low
dropout voltage, low supply current and output voltage
monitoring are critical. It provides a very simple, low cost
solution that uses very little pcb real estate. Only two
external capacitors and one resistor are required for
operation.
The SC1457 contains a bandgap reference trimmed for
optimal temperature coefficient which is fed into the
inverting input of an error amplifier. The output voltage
of the regulator is divided down internally using a
resistor divider and compared to the bandgap voltage.
The error amplifier drives the gate of a low R
DS(ON)
P-channel MOSFET pass device.
An active high enable pin (EN) allows the regulator to be
shut down. Pulling this pin low causes the device to
enter a very low power shutdown mode, where it will draw
typically 0.1A from the input supply.
An open drain flag pin (FLG) is provided to signal
whenever the output voltage is 6% (typically) below
nominal. A tap is taken from the internal resistor divider
and compared to the bandgap voltage to determine if
the output voltage is above or below this level. The flag
pin pulls low whenever the output is out of specification.
An external pullup resistor is required for a high signal
when the flag pin is not pulling low. Since this circuitry is
powered from the input supply, the FLG pin will pull low
for output voltages all the way down to zero, unlike
external devices powered from the LDO output.
The regulator has its own current limit circuitry to
ensure that the output current will not damage the
device during output short, overload or start-up. The
current limit is guaranteed to be greater than 400mA to
allow fast charging of the output capacitor and high
initial currents for DSP initialization.
The SC1457 includes thermal shutdown circuitry to turn
off the device if T
J exceeds 150°C (typical), with the
device remaining off until T
J drops by 20°C (typical).
Reverse battery protection circuitry ensures that the
device cannot be damaged if the input supply is
accidentally reversed, limiting the reverse current to less
than 1.5mA.
Component Selection - General
Output capacitor - Semtech recommends a minimum
capacitance of 1F at the output with an equivalent
series resistance (ESR) of < 1
over temperature. While
the SC1457 has been designed to be used with ceramic
capacitors, it does not have to be used with ceramic
capacitors, allowing the designer a choice. Increasing the
bulk capacitance will further reduce output noise and
improve the overall transient response.
Input capacitor - Semtech recommends the use of a
1F ceramic capacitor at the input. This allows for the
device being some distance from any bulk capacitance
on the rail. Additionally, input droop due to load transients
is reduced, improving overall load transient response.
Flag pullup resistor - Semtech recommends a maximum
value of 100k
for this resistor to ensure that this pin is
high even under worst-case flag pin leakage conditions
of 1A when off.
x7XX
yyww
x = package (5 for SOT-23-5, T for TSOT-23-5)
7 = SC1457
XX = voltage option
(examples: 5731 for 3.1V option in SOT-23-5,
T728 for 2.8V option in TSOT-23-5)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1457ISK-X.XTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:150mA Ultra Low Dropout Regulator with Undervoltage Flag |
| SC1457ISKX.XTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:150mA Ultra Low Dropout Regulator with Undervoltage Flag |
| SC1457ITSK-XXTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:150mA Ultra Low Dropout Regulator with Undervoltage Flag |
| SC1457ITSKXXTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:150mA Ultra Low Dropout Regulator with Undervoltage Flag |
| SC1458 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Output Low Noise LDO Linear Regulator |
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