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参数资料
| 型号： | A4491EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2.2A TRPL 20QFN |
| 标准包装： | 9,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 2.2A |
| 同步整流器： | 无 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN（4x4） |
A4491
Triple Output Step-Down Switching Regulator
Features and Benefits
? Three buck converters in a single package
? 4.5 to 23 V input voltage range
? 550 kHz fixed frequency
? Multiphase switching for smaller components and
lower EMI
? Independent control of each converter for sequencing and
shutdown control
? Power-on-reset flag with adjustable delay
? Internal compensation to minimize components and
simply design
? 4 × 4 mm QFN Package, small PCB footprint
Package: 20-contact QFN (suffix ES)
Approximate size
Description
Designed to provide the power supply requirements of printers,
office automation, industrial, and portable equipment, the
A4491 provides three high current, high performance, switching
regulator outputs in a single package, saving space, cost and
component count.
High frequency switching allows selection of inexpensive
inductors and small ceramic output capacitors. The turn-on
cycles of the regulators are interleaved to minimize stresses on
the input capacitors and to reduce EMI. Independent Enable
pins simplify power sequencing and shutdown capabilities,
and a power-on-reset (POR) circuit with user configurable
delay indicates when enabled regulators are in specification.
Continued on the next page…
Applications:
? Photo, inkjet, and portable printers
? Set-top boxes
? Tablet computing
? Other Consumer Electronics applications
? Point-of-sale applications
? Security systems
? Gaming machines
? Other Industrial applications
Typical Application
V BB
VDD
PORZ
CPOR
CP1 CP2
VCP VBB1
LX1
V REG1
Microcontroller or
Controller Logic
ENB1
A4491
FB1
VBB2
ENB2
ENB3
PGND
GND
LX2
FB2
VBB3
LX3
V REG2
V REG3
FB3
4491-DS, Rev. 1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A4492 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Designed to provide the power supply requirements for automotive applications, the A4492 provides three high current, high performance, switching regulator outputs with independent soft start. |
| A4492EESTR-T | 功能描述:IC REG SW STEPDOWN TRPL 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| A4496T1T | 制造商:Pentair Technical Products / Hoffman 功能描述:4X4, 96 LONG TYPE 1 TROUGH Gray, 4.00x4.00x96.00, Steel |
| A44A | 制造商:RIVETS 功能描述: |
| A44CCOL | 制造商:HOFFMAN ENCLOSURES 功能描述:ENCLOSURE;STRAIGHT PEDESTAL COLUMN FOR CONSOLET;35.00X4.00X4.00;STEEL;GRAY 制造商:HOFFMAN ENCLOSURES 功能描述:CONSOLETS PEDESTAL COLUMN 制造商:Pentair Technical Products / Hoffman 功能描述:CONSOLETS PEDESTAL COLUMN; Accessory Type:Straight Pedestal Column; For Use With:Consolet enclosures, 18 x 18 in pedestal base; Body Color:Grey; Enclosure Material:Steel; External Body Height:35"; External Height:35" ;RoHS Compliant: Yes |
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