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| 型号： | A4491EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2.2A TRPL 20QFN |
| 标准包装： | 9,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 2.2A |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN（4x4） |
A4491
Triple Output Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS * at T A = 25°C, V BB = 12 V, V DD supplied externally, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
General
VBB Quiescent Current
VDD Supply Range
VDD Quiescent Current
I BBON
I BBOFF
V DD
I DD
ENBx = high, I LOAD = 0 mA, V BB = 12 V,
current drawn by feedback resistors ignored
ENBx = 0 V
ENBx = high
ENBx = 0 V
–
–
3.3
–
–
1
1
–
–
1
2
–
5.5
6
–
mA
μ A
V
mA
μ A
REG1, REG2, and REG3
Feedback Input Bias Current
I BIAS
–400
–100
100
nA
Feedback Voltage
Fixed Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Buck Switch On-Resistance
Current Limit Threshold
Soft Start Duration
V FB
f SW
DC max
DC min
R DS(on)
I LIM
t ss
With respect to 0.8 V target voltage; V BB = 6 to 23 V
T J = 25°C, I LOAD = 1.5 A, V BB = 6.0 V
T J = 125°C, I LOAD = 1.5 A, V BB = 6.0 V
T J = 25°C, I LOAD = 1.5 A, V BB = 4.5 V
T J = 125°C, I LOAD = 1.5 A, V BB = 4.5 V
Peak current through switch with D = 0.9
–
470
90
–
–
–
–
–
2.0
0.625
±1
550
–
5
450
700
560
870
1.25
–
630
–
–
–
–
–
–
1.875
%
kHz
%
%
m Ω
m Ω
m Ω
m Ω
A
ms
Logic Inputs and Outputs
ENBx Input Voltage
ENBx Input Hysteresis
V IL
V IH
V I(hys)
–
2.0
300
–
–
500
0.8
–
–
V
V
mV
ENBx Input Current
PORZ Output (Open Drain)
PORZ Output Leakage Current
Power-On Reset Duration
I IL
V PORZL
I PORZH
t POR
V IH ≤ 5 V
I PORZL = 1 mA, fault asserted
V PORZ = 5 V, fault not asserted
C POR = 470 nF
–1
–
–1
75
–
–
–
115
1
0.4
1
155
μ A
V
μ A
ms
Protection
VREGx Undervoltage Lockout Startup
VREGx Undervoltage Lockout Shutdown
VREGx Undervoltage Lockout
Startup Hysteresis
VBB Undervoltage Lockout Startup
VBB Undervoltage Lockout Shutdown
VBB Undervoltage Lockout
V REGUV(su)
V REGUV(sd)
V REGUV(suhys)
V BBUV(su)
V BBCPUV(su)
V BBUV(sd)
V BBCPUV(sd)
V BBUV(sdhys)
FB1, FB2, and FB3 rising
FB1, FB2, and FB3 falling
No external VDD supply, V BB rising
External VDD supply, V BB rising
No external VDD supply, V BB falling
External VDD supply, V BB falling
No external VDD supply
–
–
–
3.7
3.8
3.6
3.0
–
85
80
5
4.3
4.2
4.1
3.5
500
–
–
–
4.7
4.6
4.7
4.3
–
%V FB
%V FB
%
V
V
V
V
mV
Shutdown Hysteresis
V BBCPUV(sdhys) External VDD supply
–
600
–
mV
VBB Undervoltage Warning Threshold
Junction Overtemperature Shutdown
Junction Overtemperature Shutdown
Hysteresis
V BBUV(por)
T JTSD
T JTSD(hys)
V BB falling (forces PORZ low); switchers continue
to operate
Temperature rising
Recovery = T JTSD –T JTSD(hys)
–
–
–
3.6
165
15
–
–
–
V
°C
°C
* For
input and output current specifications, negative current is defined as coming out of (sourcing) the specified pin.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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