参数资料
| 型号： | A4403GEUTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16QFN |
| 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 0.8V |
| 输入电压： | 9 V ~ 46 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 450kHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（4x4） |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1273-6 |
A4403
Valley Current Mode Control Buck Converter
ELECTRICAL CHARACTERISTICS 1 valid at T J = 25°C, V IN = 9 to 46 V, unless otherwise noted
Characteristic
Symbol
Conditions
Min.
Typ.
Max.
Units
General
V IN Quiescent Current
Feedback Voltage
Feedback Input Bias Current
Output Voltage Tolerance 2
On-Time Tolerance
Minimum On-Time Period
Minimum Off-Time Period
Buck Switch On-Resistance
Current Limit Threshold
Soft Start Current Source
I VINOFF
I VINON
V FB
I BIAS
? V OUT
? T ON
T on(min)
T off(min)
R DS(on)
I LIM
I SS
DIS = high, VIN = 46 V
DIS = low, VIN = 46 V, I LOAD = 1 mA
T J = 25°C
I LOAD = 1 mA to 3 A
Based on selected value
T J = 25°C, I LOAD = 3 A
T J = 125°C, I LOAD = 3 A
Valley current in external sense resistors = 50 m Ω
–
–
0.792
–400
–2.5
–15
–
–
–
–
3.0
5
–
4.3
0.8
–100
–
–
50
–
350
550
3.6
10
100
5.5
0.808
100
2.5
15
60
350
–
–
4.2
15
μ A
mA
V
nA
%
%
ns
ns
m Ω
m Ω
A
μ A
Input
DIS Input Voltage Threshold
DIS Open-Circuit Voltage
DIS Input Current
V DIS
V DISOC
I IN
Device enabled
Device disabled
DIS = 0 V
–
2
–10
–
–
–
1
7
–1
V
V
μ A
Protection
FB Overvoltage Shutdown
V FBOV
–
0.88
–
V
VIN Undervoltage Shutdown Threshold
VIN Undervoltage Shutdown Hysteresis
Overtemperature Shutdown Threshold
Overtemperature Shutdown Hysteresis
V INUV
V INUV(hys)
T JTSD
T JTSD(hys)
Voltage rising
Temperature rising
Recovery = T JTSD – T JTSD(hys)
6.4
0.7
–
–
–
–
165
15
7.5
1.1
–
–
V
V
°C
°C
1 Specifications
over the junction temperature range of –40°C to 125°C are assured by design and characterization.
2 Average value of V OUT relative to target voltage. Note that the tolerance effects of the feedback resistors are not taken into account. This figure does
include the feedback voltage tolerance.
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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