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參數(shù)資料
| 型號： | NCV8505D2T25G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PSSO7 |
| 封裝： | LEAD FREE, D2PAK-7 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | NCV8505D2T25G |
NCV8505 Series
http://onsemi.com
9
CIRCUIT DESCRIPTION
REGULATOR CONTROL FUNCTIONS
The NCV8505 contains the microprocessor compatible
control function RESET (Figure 15).
Figure 15. 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 1.5% of the regulated output
voltage, or when V
OUT
drops out of regulation,and is lower
than 4.0% 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.
The integrity of the ENABLE pin allows it to be tied to the
battery line through an external resistor. It will withstand
load dump potentials in this configuration.
Figure 16. ENABLE Function
V
IN
V
OUT
GND
NCV8505
ENABLE
V
BAT
Up to 45 V
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 4.0
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.
Voltage Adjust
Figure 17 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 (1.30 V
typical).
Figure 17. Adjustable Output Voltage
V
OUT
V
ADJ
NCV8505
15 k
5.1 k
C
OUT
≈
5.0 V
1.28 V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCV8505D2T25R4G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
| NCV8505D2T33G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
| NCV8505D2T33R4G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
| NCV8505D2T50G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
| NCV8505D2T50R4G | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, and RESET |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8505D2T25R4 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 400mA 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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 |
| NCV8505D2T25R4G | 功能描述:低壓差穩(wěn)壓器 - LDO MICROPOWER 400 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(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 |
| NCV8505D2T33 | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 400mA 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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 |
| NCV8505D2T33G | 功能描述:低壓差穩(wěn)壓器 - LDO MICROPOWER 400 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(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 |
| NCV8505D2T33R4 | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 400mA 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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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