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參數(shù)資料
| 型號(hào)： | NCV4299 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 5.0V Low Drop Fixed Voltage Regulator(5.0V，低壓差固定電壓穩(wěn)壓器) |
| 中文描述： | 固定5.0V低壓差穩(wěn)壓器（5.0V，低壓差固定電壓穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 16/23頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | NCV4299 |
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NCV4299
http://onsemi.com
16
Reset Output (RO)
A reset signal, Reset Output (RO, low voltage) is
generated as the IC powers up. After the output voltage V
Q
increases above the reset threshold voltage V
RT
, the delay
timer D is started. When the voltage on the delay timer V
D
passes V
UD
, the reset signal RO goes high. A discharge of
the delay timer (V
D
) is started when V
Q
drops and stays
below the reset threshold voltage V
RT
. When the voltage of
the delay timer (V
D
) drops below the lower threshold
voltage V
LD
, the reset output voltage V
RO
is brought low to
reset the processor.
The reset output RO 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 RO is valid for V
Q
as low as 1.0 V.
V
I
V
Q
V
D
V
UD
V
RO
V
RT
V
LD
V
RO
,
SAT
t
d
t
RR
< t
RR
t
t
t
t
dV
dt
ID
CD
Power-on-Reset
Thermal
Shutdown
Voltage Dip
at Input
Undervoltage
Secondary
Spike
Overload
at Output
Figure 41. Reset Timing Diagram
Reset Adjust (RADJ)
The reset threshold V
RT
can be decreased from a typical
value of 4.65 V to as low as 3.5 V by using an external
voltage divider connected from the Q lead to the pin RADJ,
as shown in Figures 39 and 40. The resistor divider keeps the
voltage above the V
RADJ,TH
, (typ. 1.35 V), for the desired
input voltages and overrides the internal threshold detector.
Adjust the voltage divider according to the following
relationship:
VTHRES
VRADJ,TH·(RADJ1
RADJ2) RADJ2
(eq. 1)
If the reset adjust option is not needed, the RADJ-pin
should be connected to GND causing the reset threshold to
go to its default value (typ. 4.65 V).
Reset Delay (D)
The reset delay circuit provides a delay (programmable by
capacitor C
D
) on the reset output RO lead. The delay lead D
provides charge current I
D
(typically 8.0 mA) to the external
delay capacitor C
D
during the following times:
1. During Powerup (once the regulation threshold has
been exceeded).
2. After a reset event has occurred and the device
is back in regulation. The delay capacitor is
set to discharge when the regulation (V
RT
, reset
threshold voltage) has been violated. When
the delay capacitor discharges to down to V
LD
,
the reset signal RO pulls low.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV4299AD233R2G | 功能描述:IC REG LDO 3.3V .15A 20SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，可調(diào)式 輸出電壓:1.2 V ~ 5 V 輸入電壓:2.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.24V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?1.2A 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-261-5，TO-261AB 供應(yīng)商設(shè)備封裝:SOT-223-5 包裝:帶卷 (TR) 其它名稱:*LP3964EMPX-ADJLP3964EMPX-ADJLP3964EMPX-ADJ-NDLP3964EMPX-ADJ/NOPBTR |
| NCV4299AD250R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 150 MA LOW IQ 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 |
| NCV4299D1 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 400mA 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 |
| NCV4299D1G | 功能描述:低壓差穩(wěn)壓器 - LDO LDO REG 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 |
| NCV4299D1R2 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 400mA 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 |
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