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參數(shù)資料
| 型號： | NCV4279B |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| 中文描述： | 5.0V的微一百五十零毫安LDO線性穩(wěn)壓器的延遲，可調(diào)復(fù)位和監(jiān)視標(biāo)志 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 102K |
| 代理商： | NCV4279B |
NCV4279B
http://onsemi.com
7
CIRCUIT DESCRIPTION
REGULATOR CONTROL FUNCTIONS
The NCV4279B contains the microprocessor compatible
control function RESET (Figure 11).
Figure 11. Reset and Delay Circuit Wave Forms
V
IN
V
OUT
RESET
DELAY
(V
DT
)
Threshold
DELAY
Threshold
RESET
T
d
T
d
RESET Function
A RESET signal (low voltage) is generated as the IC
powers up until V
OUT
is within 6.0% of the regulated output
voltage, or when V
OUT
drops out of regulation,and is lower
than 8.0% below the regulated output voltage. Hysteresis is
included in the function to minimize oscillations.
The RESET output is an open collector NPN transistor,
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC thereby
guaranteeing that the RESET signal is valid for V
OUT
as low
as 1.0 V.
Adjustable Reset Function
The reset threshold can be made lower by connecting an
external resistor divider to the R
ADJ
lead from the V
OUT
lead, as displayed in Figure 12. This lead is grounded to
select the default value of 4.6 V.
Figure 12. Adjustable RESET
R
ADJ
to
μ
P and
System
Power
R
RST
V
OUT
C
OUT
RESET
C
DELAY
Delay
NCV4279B
to
μ
P and
RESET
Port
DELAY Function
The reset delay circuit provides a programmable (by
external capacitor) delay on the RESET output lead.
The DELAY lead provides source current (typically
2.5 A) to the external DELAY capacitor during the
following proceedings:
1. During Power Up (once the regulation threshold
has been verified).
2. After a reset event has occurred and the device is
back in regulation. The DELAY capacitor is
discharged when the regulation (RESET threshold)
has been violated. This is a latched incident. The
capacitor will fully discharge and wait for the
device to regulate before going through the delay
time event again.
FLAG/Monitor Function
An onchip comparator is provided to perform an early
warning to the microprocessor of a possible reset signal. The
reset signal typically turns the microprocessor off
instantaneously. This can cause unpredictable results with
the microprocessor. The signal received from the FLAG pin
will allow the microprocessor time to complete its present
task before shutting down. This function is performed by a
comparator referenced to the bandgap reference. The actual
trip point can be programmed externally using a resistor
divider to the input monitor (MON) (Figure 13). The typical
threshold is 1.20 V on the MON Pin.
Figure 13. FLAG/Monitor Function
V
BAT
V
IN
MON
V
OUT
C
OUT
V
CC
I/O
RESET
μ
P
FLAG
RESET
GND
Delay
NCV4279B
R
ADJ
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| NCV4279BDW | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BDWR2 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD1 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD1R2 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD2 | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4279BD1 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD1R2 | 功能描述:IC REG LDO 5V .15A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| NCV4279BD1R2G | 制造商:ON Semiconductor 功能描述:ANA 5.0V MICROPOWER, PB FREE - Tape and Reel |
| NCV4279BD2 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| NCV4279BD2R2 | 功能描述:IC REG LDO 5V .15A 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
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