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參數(shù)資料
| 型號： | A8450KLBTR-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 546K |
| 描述： | IC REG QD BUCK/LINEAR 24-SOIC |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 拓?fù)洌?/td> | 降壓（降壓）（1），線性（LDO）（4） |
| 功能： | 車載 |
| 輸出數(shù)： | 4 |
| 電壓/電流 - 輸出 1： | 5.7V，1.2A |
| 電壓/電流 - 輸出 2： | 5V，200mA |
| 電壓/電流 - 輸出 3： | 5V，200mA |
| 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： | 6 V ~ 45 V |
| 工作溫度： | -40°C ~ 135°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
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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