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| 型号： | A4490EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/17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： | 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： | 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
Features and Benefits
? Three buck converters
? 4.5 to 34 V input voltage range
? 550 kHz fixed frequency
? Multiphase switching
? Independent control of each converter
? Power-on-reset flag
? Internal compensation
? 4 × 4 mm QFN Package, small PCB footprint
Package: 20-contact QFN (suffix ES)
Description
Designed to provide the power supply requirements of printers,
office automation, industrial, and portable equipment, the
A4490 provides three high current, high performance, switching
regulator outputs with independent soft start.
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. A charge pump is used
to provide the supply for driving the power switches, ensuring
operation at very wide operating duty cycles and avoiding the
need for power-draining clamp circuits.
A power-on-reset circuit with user configurable delay indicates
when enabled regulators are in specification. The power-on-
reset flag also indicates when the input voltage drops below
specification, giving the system controller advance warning
while the switchers continue to operate down to the shutdown
level.
Internal diagnostics provide comprehensive protection against
overloads, input undervoltages, and overtemperatures.
Continued on the next page…
Approximate size
Typical Application
V BB
VDD
PORZ
CPOR
CP1 CP2
VCP VBB1
LX1
V REG1
Microcontroller or
Controller Logic
ENB1
A4490
FB1
VBB2
ENB2
ENB3
PGND
GND
LX2
FB2
VBB3
LX3
V REG2
V REG3
FB3
4490-DS, Rev. 10
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