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参数资料
| 型号： | MAX44269EWL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR DUAL LP 9WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 通用 |
| 元件数： | 2 |
| 输出类型： | 开路漏极 |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V |
| 电流 - 静态（最大值）： | 1µA |
| 磁滞： | 6mV |
| 封装/外壳： | 9-WFBGA，WLBGA |
| 安装类型： | 表面贴装 |
| 包装： | 标准包装 |
| 其它名称： | MAX44269EWL+TDKR |
Maxim Integrated Products 12
MAX44269
1.3mm x 1.3mm, Low-Power
Dual Comparator
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Window Detector Circuit
The IC is ideal for window detectors (undervoltage/over-
voltage detectors). Figure 10 shows a window detector
circuit for a single-cell Li+ battery with a 2.9V end-of-life
charge, a peak charge of 4.2V, and a nominal value of
3.6V. Choose different thresholds by changing the values
of R1, R2, and R3. OUTA provides an active-low under-
voltage indication, and OUTB provides an active-low
overvoltage indication. The open-drain outputs of both
the comparators are wired OR to give an active-high
power-good signal.
The design procedure is as follows:
1) Select R1. The input bias current into INB- is less than
15nA, so the current through R1 should exceed 1.5A
for the thresholds to be accurate. In this example,
choose R1 = 825kI (1.24V/1.5A).
2) Calculate R2 + R3. The overvoltage threshold should
be 4.2V when VIN is rising. The design equation is as
follows:
OTH
REF
V
R2 R3 R1 x
1
V
4.2
825 x
1
1.24
= 1969k
+
=
=
3) Calculate R2. The undervoltage threshold should be
2.9V when VIN is falling. The design equation is as
follows:
(
) (
)
(
)
REF
UTH
V
R2 (R1 R2 R3)x
R1
V
825
1969 x 1.24 / 2.9
825
370k
=
++
=
+
=
For this example, choose a 374kI standard value 1%
resistor.
4) Calculate R3:
R3 (R2 R3) R2
1969k
374k
=1.595M
=
+
=
For this example, choose a 1.58MI standard value 1%
resistor.
Board Layout and Bypassing
Use 1.0FF bypass capacitors from VCC to GND. To maxi-
mize performance, minimize stray inductance by putting
this capacitor close to the VCC pin and reducing trace
lengths.
Figure 10. Window Detector Circuit
Chip Information
PROCESS: BiCMOS
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX44269EWL+T
-40NC to +85NC
9 WLP
+AJL
VCC
5V
VIN
INB+
INA+
VOTH = 4.2V
VUTH = 2.9V
INA-
INB-
GND
R1
R2
R3
GND
OUTB
OUTA
POWER
GOOD
MAX44269
REF
1.24V
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相关代理商/技术参数 |
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|---|---|
| MAX4426C/D | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX4426C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX4426C/D+ | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX4426CPA | 功能描述:功率驱动器IC Dual High-Speed 1.5A MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX4426CPA+ | 功能描述:功率驱动器IC Dual High-Speed 1.5A MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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