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| 型号： | NCV8503PWADJ |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .4A 16-SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 47 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.4V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA |
| 电流 - 限制（最小）： | 425mA |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
NCV8503 Series
CIRCUIT DESCRIPTION
REGULATOR CONTROL FUNCTIONS
The NCV8503 contains the microprocessor compatible
control function RESET (Figure 15).
V IN
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.
V OUT
DELAY
RESET
Threshold
DELAY
Threshold
V BAT
Up to 45 V
10 k
V IN
NCV8503
V OUT
RESET
T d
T d
(V DT )
ENABLE
GND
Figure 15. Reset and Delay Circuit Wave Forms
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.
Adjustable Reset Function
The reset threshold can be made lower by connecting an
external resistor divider to the R ADJ lead from the V OUT
lead, as displayed in Figure 16. This lead is grounded to
select the default value of 4.6 V (on the 5.0 V option).
to m P and
System
Figure 17. ENABLE Function
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 m 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
V R(ADJ)
R ADJ
V OUT
NCV8503
R RST
Power
C OUT
terminal is tied to the on ? chip 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 18). The typical threshold is
DELAY
RESET
to m P and
RESET
Port
1.28 V on the MON pin.
V MON
C DELAY
V BAT
V IN
V OUT
V CC
Figure 16. Adjustable RESET
NCV8503
MON FLAG
C OUT
I/O
m P
R ADJ
DELAY
RESET
GND
RESET
Figure 18. Flag/Monitor Function
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8503PWADJG | 功能描述:低压差稳压器 - LDO 400mA ADJ 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 |
| NCV8503PWADJR2 | 功能描述:低压差稳压器 - LDO 400mA ADJ 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 |
| NCV8503PWADJR2G | 功能描述:低压差稳压器 - LDO 400mA ADJ 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 |
| NCV8504 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 400 mA LDO Linear Regulators with DELAY, Adjustable RESET, and General Use Comparator |
| NCV8504_07 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 400 mA LDO Linear Regulators with DELAY, Adjustable RESET, and General Use Comparator |
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