参数资料
| 型号： | A8670EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 3/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 20QFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 输入电压： | 7 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 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： | 标准包装 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 其它名称： | 620-1397-6 |
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A8670
Features and Benefits (continued)
Fixed Frequency, 2 A Synchronous Buck Regulator
With Fault Warnings and Power OK
Description (continued)
?Adjustable switching frequency and current limit to optimize
efficiency and external component sizing
?Externally adjustable soft-start time
?Shutdown supply current only 1 μ A
?Pre-bias start-up capability
?Input voltage range: from 7 to 16 V
output overvoltages, overtemperature, output overloads, short-
circuits, current source overloads and any single point failures.
The A8670 is extremely flexible, with external loop compensation,
on-time select (switching frequency), programmable soft-start, and
current limit. The selectable pulse-by-pulse current limit avoids
the requirement to oversize the inductor to cope with large fault
currents. The switching frequency can be chosen, between 200 kHz
and 1 MHz.
The device package (ES) is a 20-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN with exposed thermal pad. The package
is lead (Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
Packing*
A8670EESTR-T 7-in. reel, 1500 pieces/reel, 12-mm carrier tape
*Contact Allegro ? for additional packing options
Absolute Maximum Ratings
Characteristic
VIN, TON, and EN Pin Voltage
LX Pin Voltage
BOOT Pin Voltage
BIAS Pin Voltage
All Other Pins
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V I
V LX
V BOOT
V BIAS
–
T A
T J (max)
T stg
Notes
With respect to GND
With respect to GND
t < 50 ns, with respect to GND
With respect to GND
E temperature range
Rating
–0.3 to 18
–0.6 to V IN + 0.3
–1.0
V LX – 0.3 to
V LX + 8.0
–0.3 to 8.0
–0.3 to 7.0
–40 to 85
150
–55 to 150
Unit
V
V
V
V
V
V
oC
oC
oC
Table of Contents
Functional Block Diagram
Pin-out Diagram and Terminal List
Functional Description
Basic Operation
Output Voltage Selection
Switch On-Time and Switching Frequency
Inductor Selection
Output Capacitor Selection
Input Capacitor Selection
3
4
7
7
7
7
8
9
9
Soft-Start and Output Overloads
Fault Handling and Reporting
Control Loop
Control Loop Design Approach
Thermal Considerations
Regulator Efficiency
Layout
Typical Applications
Package Outline Drawing
Allegro MicroSystems, LLC
115 Northeast Cutoff
10
11
13
14
17
18
19
20
26
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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