参数资料
| 型号： | A4447SLJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 8SOIC |
| 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： | 0.8 V ~ 24 V |
| 输入电压： | 8 V ~ 50 V |
| PWM 型： | 电流模式 |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOIC-EP |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1329-6 |
A4447
High Voltage Step Down Regulator
ELECTRICAL CHARACTERISTICS 1,2 at T A = 25°C, V IN = 8 to 50 V (unless noted otherwise)
Characteristics
VIN Quiescent Current 3
VBIAS Input Current
Buck Switch On Resistance
Fixed Off-Time Proportion
Feedback Voltage
Output Voltage Regulation
Feedback Input Bias Current
Soft Start Time
Buck Switch Current Limit
ENB Open Circuit Voltage
ENB Input Voltage Threshold
ENB Input Current
VIN Undervoltage Threshold
VIN Undervoltage Hysteresis
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Symbol
I VIN(Q)
I BIAS
R DS(on)
t off
V FB
V OUT
I FB
t ss
I CL
V OC
V ENB(0)
I ENB(0)
V UVLO
V UVLO(hys)
T JTSD
T JTSD(hys)
Test Conditions
V ENB = LOW, I OUT = 0 mA, V IN = 42 V,
V BIAS = V OUT
V ENB = LOW, I OUT = 0 mA, V IN = 42 V,
V BIAS < 3 V
V ENB = HIGH
V BIAS = V OUT
T A = 25°C, I OUT = 2 A
T A = 125°C, I OUT = 2 A
Based on calculated value
I OUT = 0 mA to 2 A
V FB > 0.4 V
V FB < 0.4 V
Output disabled
LOW level input (Logic 0), output enabled
V ENB = 0 V
V IN rising
V IN falling
Temperature increasing
Recovery = T JTSD – T JTSD(hys)
Min.
–
–
–
–
–
–
–15
0.784
–3
–400
5
2.2
0.5
2.0
–
–10
6.6
0.7
–
–
Typ.
0.90
4.4
–
3.5
450
650
–
0.8
–
–100
10
–
–
–
–
–
6.9
–
165
15
Max.
1.35
6.35
100
5
–
–
15
0.816
3
100
15
3
1.2
7
1.0
–1
7.2
1.1
–
–
Units
mA
mA
μ A
mA
m Ω
m Ω
%
V
%
nA
ms
A
A
V
V
μ A
V
V
°C
°C
1 Negative
current is defined as coming out of (sourcing) the specified device pin.
2 Specifications
over the junction temperature range of 0oC to 125oC are assured by design and characterization.
3 VBIAS is connected to VOUT when the V
OUT target is between 3.3 and 5 V.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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