参数资料
型号: A4490EESTR-T
厂商: Allegro Microsystems Inc
文件页数: 4/17页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A TRPL 20QFN
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 3
输出电压: 可调
输入电压: 4.5 V ~ 34 V
PWM 型: 电流模式
频率 - 开关: 550kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-WFQFN 裸露焊盘
包装: 标准包装
供应商设备封装: 20-QFN 裸露焊盘(4x4)
产品目录页面: 1141 (CN2011-ZH PDF)
其它名称: 620-1245-6
A4490
Triple Output Step-Down Switching Regulator
Pin-out Diagram
FB1
VDD
1
2
15
14
ENB3
FB3
GND
FB2
ENB2
3
4
5
PAD
13
12
11
PGND
CP1
CP2
Terminal List
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
FB1
VDD
GND 1
FB2
ENB2
LX2
VBB2 2
CPOR
PORZ
VCP
CP2
CP1
PGND 1
FB3
ENB3
LX3
VBB3 2
VBB1 2
LX1
ENB1
PAD 3
Function
Feedback REG1
Bias supply
Ground
Feedback REG2
Enable REG2, logic input, active high
Switch node REG2
Input supply for REG2
POR delay adjustment
Power on reset output, active low
Charge pump reservoir
Charge pump capacitor terminal
Charge pump capacitor terminal
Ground for charge pump circuitry
Feedback REG3
Enable REG3, logic input, active high
Switch node REG3
Input supply for REG3
Input supply for REG1
Switch node REG1
Enable REG1, logic input, active high
Exposed pad for enhanced thermal dissipation
1 GND
and PGND should be connected externally.
2 The three VBBx pins should be connected together externally.
3 Thermal pad should be connected to the ground (0 V) plane using thermal vias.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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