参数资料
| 型号： | A8670EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/28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
Fixed Frequency, 2 A Synchronous Buck Regulator
With Fault Warnings and Power OK
ELECTRICAL CHARACTERISTICS 1 (continued) Valid at T J = –20°C to 125°C and V IN = 12 V; unless otherwise specified
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Fault Reporting and Power OK
Undervoltage Threshold (Rising)
Undervoltage Hysteresis
Overvoltage Threshold (Rising)
POK Rising Delay
ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ Overtemperature
ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ Overtemperature Hysteresis
POK and ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ Output Voltage
Minimum VIN for correct operation of
POK and ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ
POK and ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ Leakage 2
POK HI
POK HYS
POK LO
POK delay
T OT
T OTHYS
V POK
V INPOK
I POK
Feedback voltage relative to reference voltage,
POK = high
POK= low
Feedback voltage relative to reference voltage,
POK = low
Temperature rising
Fault release = T OT – T OTHYS
I POK = 10 mA, fault asserted
POK and ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ pull-up of 2 k Ω to 5 V
V POK = 5.5 V, fault not asserted
85
–
110
–
–
–
–
–
–
90
5
115
90
140
20
–
3.5
–
95
–
120
–
–
–
500
–
1
%
%
%
μ s
°C
°C
mV
V
μ A
Protection
Pulse-by-Pulse Valley Current Limit
Hiccup Overload Duration
Hiccup Shutdown Duration
Pulse-by-Pulse Negative Valley
Current Limit
High-Side Switch Protection Current
High-Side Switch Protection Voltage
VIN Undervoltage Lockout
VIN Undervoltage Lockout Hysteresis
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
I LIM
t HICOC
t HICSD
I NLIM
I HIPRO
V HIPRO
V UVLO
V UVLOHYS
T SD
T SDHYS
ILIM = open
ILIM = GND
Valley current limit reached
Load acting as a current source
LX node short-circuited to GND
LX node short-circuited to GND
V IN rising
Temperature rising
Recovery = T SD – T SDHYS
2.1
1.0
–
–
–700
–
1.8
6.0
–
–
–
2.7
1.30
50
300
–
9
2.0
6.4
400
160
15
3.3
1.6
–
–
–500
–
2.2
6.8
–
–
–
A
A
μ s
μ s
mA
A
V
V
mV
°C
°C
1 Specifications throughout the junction temperature, T J , range of –20oC to 125oC are assured by design and characterization unless otherwise noted.
2 Positive current is into the node or pin, negative current is out of the node or pin.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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