参数资料
型号: A8450KLB
厂商: Allegro Microsystems Inc
文件页数: 8/17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:
带监控器:
带序列发生器:
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
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Description
Buck Converter with Switching Regulator. A current-
mode, variable frequency buck DC-to-DC converter and switch-
ing regulator are integrated in the A8450, as shown in figure 2.
This feature allows the device to efficiently handle power over a
wide range of input supply levels. The DC-to-DC converter out-
puts 5.7 V typical, and has an overcurrent limit of 1.2 A typical.
The converter employs a soft-start feature. This ramps the con-
verter output voltage and limits the maximum demand on V
REG
 
by controlling the inrush current required at power-on to charge
the external capacitor, COUT, and any DC load.
An internal charge pump provides gate drive for the
N-channel MOSFET buck switch. A 100% duty cycle is imple-
mented when using low V
BB
 input voltages.
At V
BB
 lower than 12 V, off-time, t
OFF
, is reduced, as shown in
figure 3. This reduction keeps the switching frequency, f
PWM
,
within a reasonable range and lowers the ripple current. Lowering
the ripple current at low V
BB
 levels prevents degradation of linear
regulator headroom due to V
REG
 ripple voltage.
5 V Linear Regulators. Two 5 V medium-power linear regulators 
are provided. These low-dropout regulators feature foldback current
limiting for short-to-ground protection. When a direct short is applied
to the regulator output, either V5A or V5D, the current folds back
Figure 2. Buck converter with switching regulator
Figure 3. When VBB falls below 12 V, t
OFF
 decreases
5.5
5
7
9
11
13
15
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
t
OFF
 by V
BB
V
BB
 (V)
4.75 約
12 V
2.05 約
11 V
0.58 約
6.02 V
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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
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