参数资料
| 型号： | A8499SLJ-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 3/7页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 8SOIC |
| 标准包装： | 98 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 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： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC-EP |
A8499
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
VBIAS Input Current
Buck Switch On Resistance
Symbol
I VIN(Q)
I BIAS
R DS(on)
Test Conditions
V ENB = LOW, I OUT = 0 mA, V IN = 42 V
V BIAS = V OUT (see note 3 )
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
Min.
–
–
–
–
–
–
Typ.
0.90
4.4
–
3.5
700
–
Max.
1.35
6.35
100
5
800
1.6
Units
mA
mA
μ A
mA
m Ω
Ω
Fixed Off-Time Proportion
Feedback Voltage
Output Voltage Regulation
Feedback Input Bias Current
Soft Start Time
V FB
I FB
t ss
Based on calculated value
I OUT = 0 mA to 2 A
–15
1.176
–3
–400
5
–
1.200
–
–100
10
15
1.224
3
100
15
%
V
%
nA
ms
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
I CL
V OC
V ENB(0)
I ENB(0)
V UVLO
V UVLOHYS
T JTSD
? T J
V FB > 0.5 V
V FB < 0.5 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 J
2.2
0.5
2.0
–
–10
–
0.7
–
–
–
–
–
–
–
6.9
–
165
15
3
1.2
7
1.0
–1
7.1
1.1
–
–
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 node when V OUT target level 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
3
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