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參數(shù)資料
| 型號(hào)： | NCV8501D25G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Micropower 150 mA LDO Linear Regulators with ENABLE, DELAY, RESET, and Monitor FLAG |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.15 V DROPOUT, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 119K |
| 代理商： | NCV8501D25G |
NCV8501 Series
http://onsemi.com
10
CIRCUIT DESCRIPTION
REGULATOR CONTROL FUNCTIONS
The NCV8501 contains the microprocessor compatible
control function RESET (Figure 13).
Figure 13. 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.
ENABLE Function
The part stays in a low I
Q
sleep mode when the ENABLE
pin is held low. The part has an internal pull down if the pin
is left floating. This is intended for failure modes only. An
external connection (active pulldown, resistor, or switch) for
normal operation is recommended.
The integrity of the ENABLE pin allows it to be tied
directly to the battery line through an external resistor. It will
withstand load dump potentials in this configuration.
Figure 14. ENABLE Function
V
IN
V
OUT
GND
NCV8501
ENABLE
V
BAT
10 k
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 15). The typical
threshold is 1.20 V on the MON pin.
Figure 15. FLAG/Monitor Function
V
BAT
V
IN
MON
V
OUT
C
OUT
V
CC
I/O
RESET
P
FLAG
RESET
GND
DELAY
NCV8501
R
ADJ
Voltage Adjust
Figure 16 shows the device setup for a user configurable
output voltage. The feedback to the V
ADJ
pin is taken from
a voltage divider referenced to the output voltage. The loop
is balanced around the Unity Gain threshold (1.28 V
typical).
Figure 16. Adjustable Output Voltage
V
OUT
V
ADJ
NCV8501
15 k
5.1 k
C
OUT
≈
5.0 V
1.28 V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8501D25R2 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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 |
| NCV8501D25R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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 |
| NCV8501D33 | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 150mA w/ENABLE 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 |
| NCV8501D33G | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 150mA w/ENABLE 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 |
| NCV8501D33R2 | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 150mA w/ENABLE 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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