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參數資料
| 型號： | NCV4279CD1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PDSO8 |
| 封裝： | SO-8 |
| 文件頁數： | 10/12頁 |
| 文件大?。?/td> | 342K |
| 代理商： | NCV4279CD1 |
NCV4279C
http://onsemi.com
7
CIRCUIT DESCRIPTION
Figure 11. Reset and Delay Circuit Wave Forms
VIN
1.8V VDT
VOUT
DELAY
RESET
RESET Threshold
Td
0.45V VLD
Td
Power on
Reset
Input
VDip
Under--voltage
Secondary
Spike
Output
Overload
REGULATOR CONTROL FUNCTIONS
The NCV4279C contains a microprocessor--compatible
control function RESET (Figure 11).
RESET Function
A RESET signal (low voltage) is generated as the IC
powers up. After VOUT increases above the RESET
threshold, the DELAY timer is started. When the DELAY
timer passes 1.8 V, the RESET signal goes high. A discharge
of the DELAY timer is started when VOUT drops and stays
below the RESET threshold. When the DELAY timer level
drops below 0.45 V, the RESET signal is brought low.
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 VOUT as low
as 1.0 V.
Adjustable Reset Function
The reset threshold can be made lower by connecting an
external resistor divider to the RADJ lead from the VOUT
lead, as displayed in Figure 12. This lead is grounded to
select the default value of 4.6 V.
Figure 12. Adjustable RESET
to mP and
System
Power
RRST
VOUT
COUT
RESET
CDELAY
Delay
NCV4279C
to mP and
RESET
Port
The reset delay circuit provides a delay (programmable by
external capacitor) on the RESET output lead.
The DELAY lead provides source current (typically
2.5 mA) to the external DELAY capacitor at the following
times:
1. During Power Up (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
discharged when the regulation (RESET threshold)
has been violated. When the DELAY capacitor
discharges to 0.45 V, the RESET signal pulls low.
FLAG/Monitor Function
An on--chip comparator is available to provide 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 voltage. 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
VBAT
VIN
MON
VOUT
COUT
VCC
I/O
RESET
mP
FLAG
RESET
GND
Delay
NCV4279C
RADJ
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相關代理商/技術參數 |
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| NCV4279CD2R2G | 制造商:ON Semiconductor 功能描述:150MA LDO LINEAR REGULATOR, PB FREE - Tape and Reel |
| NCV4279D1 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA MicroPower 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4279D1G | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA MicroPower w/Sense Output 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4279D1R2 | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA MicroPower 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV4279D1R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA MicroPower w/Sense Output 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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