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参数资料
| 型号： | A8450KLB |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/17页 |
| 文件大小： | 546K |
| 描述： | IC REG QD BUCK/LINEAR 24-SOIC |
| 标准包装： | 31 |
| 拓扑： | 降压（降压）（1），线性（LDO）（4） |
| 功能： | 车载 |
| 输出数： | 4 |
| 电压/电流 - 输出 1： | 5.7V，1.2A |
| 电压/电流 - 输出 2： | 5V，200mA |
| 电压/电流 - 输出 3： | 5V，200mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 6 V ~ 45 V |
| 工作温度： | -40°C ~ 135°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
Automotive Multioutput Voltage Regulator
A8450
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
low, ENB acts as a single reset control.
Diagnostics. An open drain output, through the NFAULT pin, is
pulled low to signal to a DSP or microcontroller any of the follow-
ing fault conditions:
" V5A, the 5 V analog regulator output, is shorted to supply
" Either or both of the V5A and the V5D regulator outputs are
below their UVLO threshold, V
UVLOV5
" Device junction temperature, T
J
, exceeds the Thermal Warning
threshold, T
JTW
Charge Pump. The charge pump generates a voltage above V
BB
in
order to provide adequate gate drive for the N-channel buck switch.
A 0.1 糉 ceramic monolithic capacitor, C7, should be connected
between the VCP pin and the VBB pin, to act as a reservoir to run
the buck converter switching regulator.
V
CP
is internally monitored to ensure that the charge pump is disabled
in the case of a fault condition. In addition, a 0.1 糉 ceramic mono-
lithic capacitor, C8, should be connected between CP1 and CP2.
Power On Reset Delay. The POR block monitors the supply
voltages and provides a signal that can be used to reset a DSP or
microcontroller. A POR event is triggered by any of the following
conditions:
" Either V33 or VADJ is pulled below its UVLO threshold,
V
UVLOV33
or V
UVLOVADJ
. This occurs if the current limit on either
regulator, V
OC
, is exceeded. It also occurs if the VREG voltage
falls below V
REGMON
, due to current exceeding I
DSLIM
.
" Both input signal pins, ENB and ENBAT, are pulled low.
This immediately pulls the NPOR pin low, indicating that the
device is beginning a power-off sequence. In addition, the buck
converter switching regulator is disabled, and the VREG supply
begins to ramp down. The rate at which V
REG
decays is depen-
dent on the total current draw, I
LOAD
, and value of the output
capacitors (C1, C2, C3, and C4).
" V
REG
drops below its UVLO threshold, V
UVLOVREG
.
" During any normal power-on, V
OUTVADJ
falls below
V
UVLOVADJ
, triggering a POR.
An open drain output, through the NPOR pin, is provided to signal a
POR event to the DSP or microcontroller. The reset occurs after an
adjustable delay, t
POR
, set by an external capacitor, C9, connected
to the CPOR pin. The value of t
POR
(ms) is calculated using the
following formula
t
POR
= 2.13
?/DIV>
10
5
?
C
CPOR
where C
CPOR
(糉) is the value of the C9 capacitor.
A POR can be forced without a significant drop in the supply volt-
age, V
REG
, by pulsing low both the ENB and the ENBAT pins.
However, pulse duration should be short enough so that V
REG
does
not drop significantly.
Thermal Shutdown. When the device junction temperature, T
J
,
is sensed to be at T
JTSD
(H15癈 higher than the thermal warning
temperature, T
JTW
), a fault is indicated at the NFAULT pin. At the
same time, a thermal shutdown circuit disables the buck converter,
protecting the A8450 from damage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8450KLB-T | 功能描述:IC REG QD BUCK/LINEAR 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（2），线性（LDO）（1） 功能:任何功能 输出数:3 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:4.5 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:28-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:* 包装:带卷 (TR) 其它名称:ISL6402IVZ-TTR |
| A8450KLB-T | 制造商:Allegro MicroSystems 功能描述:Voltage Regulator IC |
| A8450KLBTR | 功能描述:IC REG QD BUCK/LINEAR 24-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（2），线性（LDO）（1） 功能:任何功能 输出数:3 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:4.5 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:28-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:* 包装:带卷 (TR) 其它名称:ISL6402IVZ-TTR |
| A8450KLBTR-T | 功能描述:IC REG QD BUCK/LINEAR 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| A845DSC | 制造商:Pentair Technical Products / Hoffman 功能描述:DSC Box 8.00x4.00x4.75 Gray, 8.00x4.00x3.75, Steel |
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