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| 型号： | A4490EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/17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
Description (continued)
Triple Output Step-Down Switching Regulator
The A4490 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced thermal
dissipation. It is lead (Pb) free, with 100% matte tin leadframe
plating.
Applications include the following:
? Photo, inkjet, and portable printers
? Industrial
? Hand-held devices
? Portable applications
Selection Guide
Part Number
A4490EESTR-T
Packing
1500 pieces per 7-in. reel
Operating Temperature Range
(°C)
–40 to 85
Absolute Maximum Ratings ( reference to GND)
Characteristic
Load Supply Voltage
LX1, LX2, and LX3 Pins
PORZ and VDD Pins
ENBx Pin Input Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V BB
V LX n
V IN
I ENBx
T A
T J (max)
T stg
Notes
Driven by a current-limited voltage source
Range E
Rating
36
–1 to 36
–0.3 to 7
1
–40 to 85
150
–55 to 150
Units
V
V
V
mA
oC
oC
oC
Recommended Operating Conditions
Characteristic
Load Supply Voltage
LX1, LX2, and LX3 Pins
Operating Ambient Temperature
Junction Temperature
Symbol
V BB
V LX n
T A
T J
Conditions
To operate at V BB < 6 V, connect V DD
supply to the V BB supply. See Powering
Configurations section.
Min.
4.5
–0.7
–40
–40
Typ.
–
–
–
–
Max.
34
34
85
125
Units
V
V
oC
oC
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Units
Package Thermal Resistance
R θ JA
On 4-layer PCB based on JEDEC standard
37
oC/W
*Additional thermal information available on the Allegro website.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
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