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A8450

更新时间: 2024-01-26 18:14:43
品牌 Logo 应用领域
急速微 - ALLEGRO 稳压器
页数 文件大小 规格书
15页 547K
描述
Automotive Multioutput Voltage Regulator

A8450 技术参数

生命周期:ObsoleteReach 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:1.35Base Number Matches:1

A8450 数据手册

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A8450  
Automotive Multioutput Voltage Regulator  
The A8450 is a multioutput power supply intended for automotive  
applications. The A8450 operates from a wide input supply range and  
is designed to satisfy the requirements of high ambient temperature  
environments.  
Package LB 24-pin SOIC  
Four regulated voltage outputs provide multiple options. The 3.3 V  
regulator and the 1.2 to 3.3 V adjustable regulator can be used to power  
microcontroller or DSP cores, or for I/O, sensing, and A-to-D conver-  
sion. Two 5 V outputs, one digital and the other analog, feature output  
tracking within 0.5% of each other over the operating temperature  
range. In addition, the analog regulator is protected against short-to-  
battery conditions. All four regulators feature foldback current limit  
protection.  
The device can be enabled or disabled using two input pins. The  
high voltage input, on the ENBAT pin, allows enable/disable using an  
engine ignition or battery switch signal. The logic-level input, on the  
ENB pin, allows enable/disable by microcontroller or DSP signals.  
When disabled, the A8450 draws less than 10 µA of current. A POR  
(power-on-reset) block monitors the supply voltages and provides a  
reset signal, with an adjustable delay, for microcontroller or DSP resets.  
A separate fault pin signals TSD (thermal shutdown), 5 V analog short-  
to-supply, and 5 V analog or digital undervoltage.  
Buck  
Converter  
VBB  
CP2  
1
2
24 LX  
23 ENBAT  
22 V33  
Charge  
Pump  
CP1  
3
VCP  
V33BD  
CL33  
4
21  
20  
19  
18  
17  
16  
15  
VREG11  
GND  
5
Soft  
Start  
3.3 V  
Lin Reg  
Control  
GND  
6
GND  
GND  
7
5 V  
Dig/Anlg  
Lin Reg  
ENB  
VREG  
V5D  
8
CPOR  
CLADJ  
VADJBD  
FB  
9
10  
11  
12  
NFAULT  
1.2 V to  
3.3 V  
Lin Reg  
Control  
14 NPOR  
13  
5 V Reg  
Track  
Control  
V5A  
The A8450 is supplied in a 24-pin SOIC package (part number  
suffix LB) with fused power ground pins for enhanced thermal perfor-  
mance. This provides an RθJA of 35°C/W on a 4-layer board (see chart  
on p.4).  
Approximate Scale 1:1  
FEATURES  
6 V to 45 V input range  
dc-to-dc buck converter with 5.7 V output  
Overcurrent protection with foldback, and undervoltage lockout (UVLO)  
Dual 5 V outputs  
ABSOLUTE MAXIMUM RATINGS  
– Digital 5 V ±2%, 200 mA  
– Analog 5 V, 200 mA  
– Short-to-supply protection on analog regulator  
– Analog to digital regulator output tracking <0.5%, throughout  
operating temperature range  
3.3 V linear regulator, with foldback current limit  
Adjustable 1.2 V to 3.3 V linear regulator, adjustable foldback current limit  
Ignition switch enable; Sleep mode  
Load Supply Voltage, VBB ..................................45 V  
Analog Output, Pin V5A........................–1 V to 45 V  
Logic Input Signal  
Pin ENBAT .................................–0.3 V to 45 V  
Pin ENB .....................................–0.3 V to 6.5 V  
Pin LX.................................................... –2 V to VBB  
Operating Temperature Range  
Ambient Temperature, TA............ –40°C to 135°C  
Junction Temperature, TJ(MAX).....................150°C  
Storage Temperature, TS .................... –55°C to 150°C  
100% duty cycle operation for low input voltages  
Power OK output  
–40°C to 135°C ambient operating temperature range  
Use the following complete part number when ordering:  
Part Number  
Package  
Description  
A8450KLB  
24-pin, SOIC  
Webbed Leadframe  
A8450KLB-DS, Rev. 1  

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