参数资料
型号: A4490EESTR-T
厂商: Allegro Microsystems Inc
文件页数: 6/17页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A TRPL 20QFN
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 3
输出电压: 可调
输入电压: 4.5 V ~ 34 V
PWM 型: 电流模式
频率 - 开关: 550kHz
电流 - 输出: 1.5A
同步整流器:
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)
产品目录页面: 1141 (CN2011-ZH PDF)
其它名称: 620-1245-6
A4490
Triple Output Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS 1,2 (continued) at T A = 25°C, V BB = 6.0 to 34 V, V DD supplied externally, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
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
1 For
input and output current specifications, negative current is defined as coming out of (sourcing) the specified pin.
2 Specifications
over the junction temperature range of –40°C to 125°C are assured by design and characterization.
3 Average value of V
OUT relative to target voltage. The effects of the feedback resistors are not taken into account.
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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