A8450KLB

更新时间： 2024-01-14 11:47:22

品牌	Logo	应用领域
急速微 - ALLEGRO		线性稳压器IC 调节器电源电路光电二极管输出元件
页数	文件大小	规格书
15页	547K
描述
Automotive Multioutput Voltage Regulator

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技术参数
数据手册

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A8450KLB 技术参数

生命周期：	Obsolete	Reach Compliance Code：	unknown
风险等级：	5.84	特性阻抗：	50 Ω
最大输入功率 (CW)：	43.98 dBm	最大工作频率：	4000 MHz
最小工作频率：		最高工作温度：	125 °C
最低工作温度：	-55 °C	射频/微波设备类型：	FIXED ATTENUATOR
最大电压驻波比：	1.35	Base Number Matches：	1

A8450KLB 数据手册

A8450

Automotive Multioutput Voltage Regulator

Functional Description

Buck Converter with Switching Regulator. A cur-

t_OFFby V_BB

rent-mode, variable frequency buck dc-to-dc converter and

switching 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 outputs 5.7 V typical, and has an overcurrent limit

of 1.2 A typical.

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

4.75 µs

12 V

The converter employs a soft-start feature. This ramps the

converter output voltage and limits the maximum demand on

V_REGby controlling the inrush current required at power-on

to charge the external capacitor, COUT, and any dc load.

2.05 µs

11 V

0.58 µs

6.02 V

An internal charge pump provides gate drive for the

N-channel MOSFET buck switch. A 100% duty cycle is

implemented when using low V_BBinput voltages.

V_BB(V)

At V_BBlower 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 cur-

rent. Lowering the ripple current at low V_BBlevels prevents

degradation of linear regulator headroom due to V_REGripple

voltage.

Figure 3. When VBB falls below 12 V, t_OFFdecreases

100 µH

5VLinear Regulators. Two 5 V medium-power linear regula-

torsareprovided.Theselow-dropoutregulatorsfeaturefoldback

current limiting for short-to-supply protection. When a direct

VBB

COUT

100 µF

Buck Converter

Buck Switch

t_OFF

VCP

Switching

Regulator

Control

I_DEMAND

ENB

Clock

Counter

I_PEAK

1.2 A Limit

Soft Start

Ramp

Generation

Compensation

Error

Bandgap

1.22 V

Clamp

VREG

Figure 2. Buck converter with switching regulator

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

A8450KLB-DS, Rev. 1

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

1...4 5 678 9 10...15

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