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参数资料
| 型号： | MAX44268EWL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR W/REF DUAL 9WLP |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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 |
| 电压 - 输入偏移（最小值）： | 5mV @ 5V |
| 电流 - 输入偏压（最小值）： | 0.15nA |
| 电流 - 输出（标准）： | 50mA |
| 电流 - 静态（最大值）： | 1.15µA |
| CMRR, PSRR（标准）： | 80dB PSRR |
| 传输延迟（最大）： | 39µs |
| 磁滞： | 6mV |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 9-WFBGA，WLBGA |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
Maxim Integrated Products 11
MAX44268
1.3mm x 1.3mm, Low-Power
Dual Comparator with Reference
Power-On-Reset Circuit
The IC can be used to make a power-on-reset circuit as
displayed in Figure 5. The negative input provides the
ratiometric reference with respect to the power supply
and is created by a simple resistive divider. Choose
reasonably large values to minimize the power consump-
tion in the resistive divider. The positive input provides
the power-on delay time set by the time constant of the
RC circuit formed by R2 and C1. This simple circuit can
be used to power up the system in a known state after
ensuring that the power supply is stable. Diode D1 pro-
vides a rapid reset in the event of unexpected power loss.
If using comparator A, R3 and R4 are not populated and
REF settles in approximately 100s.
Relaxation Oscillator
The IC can also be used to make a simple relaxation
oscillator (Figure 6) using comparator B. By adding the
RC circuit R5 and C1, a standard Schmidt Trigger circuit
referenced to a set voltage is converted into an astable
multivibrator. As shown in Figure 7, IN- is a sawtooth
waveform with capacitor C1 alternately charging and
discharging through resistor R5. The external hysteresis
network formed by R1 to R4 defines the trip voltages as:
T_RISE
CC
T_FALL
CC
R3 x R4
V
R2R3 R2R4 R3R4
R4R5(R1 R2 R3)
R1R3R4
V
R4R5(R1 R2 R3) R1R3R4
R2(R1R3 R3R5 R1R5)
=
+
++
+
=
++
+
+
++
Using the basic time domain equations for the charging
and discharging of an RC circuit, the logic-high time,
logic-low time, and frequency can be calculated as:
=
T_FALL
LOW
T_RISE
V
R5C1 ln
t
V
Since the comparator’s output is open drain, it goes to
high impedance corresponding to logic-high. So, when
the output is at logic-high, the C1 capacitor charges
through the resistor network formed by R1 to R5. An
accurate calculation of tHIGH would have involved
applying thevenin’s theorem to compute the equivalent
thevenin voltage (VTHEVENIN) and thevenin resistance
Figure 6. Relaxation Oscillator
Figure 5. Power-On Reset Circuit
Figure 4. Logic-Level Translator
VCC
R3
R2
R4
R5
R1
GND
OUT
MAX44268
VCC
C1
VCC
R3
R2
D1
R4
C1
R1
GND
RESET
MAX44268
VCC
VPULL
VIN
VREF
GND
OUT
R1
MAX44268
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX44269EWL+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX44269EWL+T | 功能描述:校验器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| 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 |
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