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NCT3720S-L の電気的特性と機能

NCT3720S-LのメーカーはnovoTonです、この部品の機能は「Ultra Low Dropout Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 NCT3720S-L
部品説明 Ultra Low Dropout Regulator
メーカ novoTon
ロゴ novoTon ロゴ 




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NCT3720S-L Datasheet, NCT3720S-L PDF,ピン配置, 機能
NCT3720S/ S-L
Nuvoton
Maximum 2A, Ultra Low
Dropout Regulator
NCT3720S/ NCT3720S-L
Publication Release Date: Jan, 2011
I Version: A3

1 Page





NCT3720S-L pdf, ピン配列
NCT3720S/ S-L
1. GENERAL DESCRIPTION
The NCT3720S/S-L is a high performance positive voltage regulator which designed for use in
applications requiring very low input voltage and very low dropout voltage up to 2A(peak)
current rating. It operates with a VIN as low as 1.0V and control voltage 3V with output voltage
programmable as low as 0.8V. The significant feature includes ultra low dropout, ideal for
applications where VOUT is very close to VIN. Additionally, there is an enable pin to further
reduce power dissipation while shutdown. The NCT3720S/S-L provides excellent regulation
over variations in line, load and temperature, and provides a Power Good indicator to indicate
if the voltage level of output voltage reaches 90% of its rating value.
2. FEATURES
Maximum 2A Ultra Low-Dropout Voltage Regulator
High Accuracy Output Voltage ±1.5%
Adjustable Output from 0.8V
Typically 150mV Dropout at 2A
Input Voltage as low as 1.0V
Power Good Indicator
Thermal and Over Current Protection
EN internal Pull High (NCT3720S) and Internal Pull Low Available (NCT3720S-L)
SOP-8 150mil with Exposed Pad Package
Lead Free (ROHS Compliant) and Halogen Free Package
3. APPLICATIONS
Desktop PCs, Notebooks, and Workstations
Graphics Card
Set Top Boxes, Digital TVs and Printers
Portable instruments
uP/ASIC/DSP/FPGA Core and I/O Supplies
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Publication Release Date: Jan, 2011
Version: A3


3Pages


NCT3720S-L 電子部品, 半導体
NCT3720S/ S-L
A minimum of 10uF ceramic capacitor is recommended to be placed directly next to the VIN pin.
This allows for the device being some distance from any bulk capacitance on the rail. Additionally,
bulk capacitance of about 10uF may be added closely to the input supply pin of the
NCT3720S/S-L to ensure that VIN does not sag, improving load transient response.
Output capacitor
A minmum bulk capacitance of 10uF, along with a 0.1uF ceramic decoupling capacitor is
recommended. Increaseing the bulk capacitance will improve the overall transient response. The
use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance
will not cause stability issues. Although designed for use with ceramic output capacitors, the
NCT3720S/S-L is extremely tolerant of output capacitor ESR values and thus will also work
comfortably with tantalum output capacitors.
Noise immunity
In very electrically noisy environments, it is recommended that 0.1uF ceramic capacitors be
placed from VIN to GND and VOUT to GND as close to device pins as possible.
Power Good
The power good function is an open-drain output. Connects 100kΩ pull up resistor to VOUT to
obtain an output voltage. The PG pin will output high immediately after the output voltage arrives
90% of normal output voltage. The PG pin will output high with typical 4ms delay time.
Enable
The NCT3720S/S-L goes into shutdown mode when the EN pin is in the logic low condition.
During this condition, the pass transistor, error amplifier, and band gap are turned off, reducing
the supply current to 10uA typical. If the EN pin is floating, NCT3720S and NCT3720S-L
operating behaviors are different. For NCT3720S, the EN pin function pulls high level internally.
So the regulator will be turn on when EN pin is floating. As for NCT3720S-L, the EN pin function
pulls low level internally. So the regulator will be turn off when EN pin is floating.
Current Limit
The NCT3720S/S-L contains an independent current limit and the short circuit current protection
to prevent unexpected applications. The current limit monitors and controls the pass transistor’s
gate voltage, limiting the output current while higher than 3A typical. When the output voltage is
less than 0.25V, the short circuit current protection starts the current fold back function and
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Publication Release Date: Jan, 2011
Version: A3

6 Page



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部品番号部品説明メーカ
NCT3720S-L

Ultra Low Dropout Regulator

novoTon
novoTon


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