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參數(shù)資料
| 型號： | A8450KLB |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Automotive Multioutput Voltage Regulator |
| 中文描述： | 汽車Multioutput穩(wěn)壓器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 549K |
| 代理商： | A8450KLB |
9
A8450KLB-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
A8450
Automotive Multioutput Voltage Regulator
ENBAT is an edge-triggered enable (logic 1
≥
2.7 V), which
is used to enable the A8450 in response to a high-voltage
signal, such as from an automobile ignition or battery switch.
In this capacity, ENBAT is used only as a momentary switch
to wake up the device. If there is no need for a high-voltage
signal, ENBAT can be pulled low continuously.
ENB is used to initiate the reset of the device. If ENBAT is
pulled 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 following 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 μF 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 μF
ceramic monolithic capacitor, C8, should be connected between
CP1 and CP2.
Power On Reset Delay
.
The POR block monitors the sup-
ply 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 dependent 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 capaci-
tor, C9, connected to the CPOR pin. The value of t
POR
(ms) is
calculated using the following formula
t
POR
= 2.13
×
10
5
×
C
CPOR
where C
CPOR
(μF) is the value of the C9 capacitor.
A POR can be forced without a significant drop in the supply
voltage, 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
(
≈
15°C 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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|---|---|
| A8450KLB-T | 功能描述:IC REG QD BUCK/LINEAR 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
| A8450KLBTR-T | 功能描述:IC REG QD BUCK/LINEAR 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| 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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