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| 型号： | MAX4243ESD |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP 1.8V BEYOND/RAIL 14SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | Beyond-the-Rails™ |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.04 V/µs |
| 增益带宽积： | 90kHz |
| 电流 - 输入偏压： | 2nA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 14µA |
| 电流 - 输出 / 通道： | 2.5mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 管件 |
Single/Dual/Quad, +1.8V/10A, SOT23,
Beyond-the-Rails Op Amps
MAX4240–MAX424
4
Using the MAX4240–MAX4244
as Comparators
Although optimized for use as operational amplifiers,
the MAX4240–MAX4244 can also be used as rail-to-rail
I/O comparators. Typical propagation delay depends
on the input overdrive voltage, as shown in Figure 9.
External hysteresis can be used to minimize the risk of
output oscillation. The positive feedback circuit, shown
in Figure 10, causes the input threshold to change
when the output voltage changes state. The two thresh-
olds create a hysteresis band that can be calculated by
the following equations:
VHYST = VHI - VLO
VLO = VIN x R2 / (R1 + (R1 x R2 / RHYST) + R2)
VHI = [(R2 / R1 x VIN) + (R2 / RHYST) x VCC] /
(1 + R1 / R2 + R2 / RHYST)
The MAX4240–MAX4244 contain special circuitry to
boost internal drive currents to the amplifier output
stage. This maximizes the output voltage range over
which the amplifiers are linear. In an open-loop com-
parator application, the excursion of the output voltage
is so close to the supply rails that the output stage tran-
sistors will saturate, causing the quiescent current to
increase from the normal 10A. Typical quiescent cur-
rents increase to 35A for the output saturating at VCC
and 28A for the output at VEE.
Using the MAX4240–MAX4244
as Ultra-Low-Power Current Monitors
The MAX4240–MAX4244 are ideal for applications
powered from a 2-cell battery stack. Figure 11 shows
an application circuit in which the MAX4240 is used for
monitoring the current of a 2-cell battery stack. In this
circuit, a current load is applied, and the voltage drop
at the battery terminal is sensed.
The voltage on the load side of the battery stack is
equal to the voltage at the emitter of Q1, due to the
feedback loop containing the op amp. As the load cur-
rent increases, the voltage drop across R1 and R2
increases. Thus, R2 provides a fraction of the load cur-
rent (set by the ratio of R1 and R2) that flows into the
emitter of the PNP transistor. Neglecting PNP base cur-
rent, this current flows into R3, producing a ground-ref-
erenced voltage proportional to the load current. Scale
R1 to give a voltage drop large enough in comparison
to VOS of the op amp, in order to minimize errors.
The output voltage of the application can be calculated
using the following equation:
VOUT = [ILOAD x (R1 / R2)] x R3
For a 1V output and a current load of 50mA, the choice
of resistors can be R1 = 2
Ω, R2 = 100kΩ, R3 = 1MΩ.
The circuit consumes less power (but is more suscepti-
ble to noise) with higher values of R1, R2, and R3.
R2
R1
VIN
OUTPUT
INPUT
VOH
VOL
VEE
VCC
VOUT
RHYST
VEE
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
HYSTERESIS
VLO
VOH
VHI
MAX4240-44
fig09
t PD
(
s)
tPD-; VCC = +5V
tPD+; VCC = +1.8V
tPD-; VCC = +1.8V
tPD+; VCC = +5V
10,000
1000
100
10
0
10 20
30 40
50 60
70 80
90 100
VOD (mV)
Figure 9. Propagation Delay vs. Input Overdrive
Figure 10. Hysteresis Comparator Circuit
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4243ESD+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX4243ESD+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX4243ESD-T | 功能描述:运算放大器 - 运放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4243EUB | 功能描述:运算放大器 - 运放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4243EUB+ | 功能描述:运算放大器 - 运放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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