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参数资料
| 型号： | NCV8503PDW25 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, PDSO16 |
| 封装： | EXPOSED PAD, SOW-16 |
| 文件页数： | 10/12页 |
| 文件大小： | 89K |
| 代理商： | NCV8503PDW25 |
NCV8503 Series
http://onsemi.com
7
CIRCUIT DESCRIPTION
REGULATOR CONTROL FUNCTIONS
The NCV8503 contains the microprocessor compatible
control function RESET (Figure 3).
Figure 3. Reset and Delay Circuit Wave Forms
VIN
VOUT
RESET
DELAY
(VDT)
Threshold
DELAY
Threshold
RESET
Td
RESET Function
A RESET signal (low voltage) is generated as the IC
powers up until VOUT is within 1.5% of the regulated output
voltage, or when VOUT 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 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 4. This lead is grounded to select
the default value of 4.6 V (on the 5.0 V option).
Figure 4. Adjustable RESET
RADJ
to
P and
System
Power
RRST
VOUT
COUT
RESET
CDELAY
DELAY
NCV8503
to
P and
RESET
Port
VR(ADJ)
ENABLE Function
The part stays in a low IQ 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 5. ENABLE Function
VIN
VOUT
GND
NCV8503
ENABLE
VBAT
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.
FLAG/Monitor Comparator
A general use comparator is included whose positive input
terminal is tied to the onchip band gap voltage reference.
This provides a very temperature stable referenced
comparator with versatile uses in any system. The trip point
can be programmed externally using a resistor divider to the
input monitor (MON) (Figure 6).
Figure 6. Flag/Monitor Function
VBAT
VIN
MON
VOUT
COUT
VCC
I/O
RESET
P
FLAG
RESET
GND
DELAY
NCV8503
RADJ
VMON
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8503PW25 | 功能描述:低压差稳压器 - LDO 2.5V 400mA w/ENABLE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8503PW25G | 功能描述:低压差稳压器 - LDO 2.5V 400mA w/ENABLE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8503PW25R2 | 功能描述:低压差稳压器 - LDO 2.5V 400mA w/ENABLE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8503PW25R2G | 功能描述:低压差稳压器 - LDO 2.5V 400mA w/ENABLE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8503PW33 | 功能描述:低压差稳压器 - LDO 3.3V 400mA w/ENABLE RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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