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| 型号： | MAX9938FEBS+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 4-UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 60kHz |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 1.1µA |
| 电压 - 电源，单路/双路(±)： | 1.6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-WFBGA，CSPBGA |
| 供应商设备封装： | 4-UCSP（1.05x1.05） |
| 包装： | 带卷 (TR) |
MAX9938
1A, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
6
_______________________________________________________________________________________
Detailed Description
The MAX9938 unidirectional high-side, current-sense
amplifier features a 1.6V to 28V input common-mode
range. This feature allows the monitoring of current out
of a battery with a voltage as low as 1.6V. The
MAX9938 monitors current through a current-sense
resistor and amplifies the voltage across that resistor.
The MAX9938 is a unidirectional current-sense amplifier
that has a well-established history. An op amp is used
to force the current through an internal gain resistor at
RS+, which has a value of R1, such that its voltage drop
equals the voltage drop across an external sense resis-
tor, RSENSE. There is an internal resistor at RS- with the
same value as R1 to minimize offset voltage. The cur-
rent through R1 is sourced by a high-voltage p-channel
FET. Its source current is the same as its drain current,
which flows through a second gain resistor, ROUT. This
produces an output voltage, VOUT, whose magnitude is
ILOAD x RSENSE x ROUT/R1. The gain accuracy is
based on the matching of the two gain resistors R1 and
ROUT (see Table 1). Total gain = 25V/V for the
MAX9938T, 50V/V for the MAX9938F, 100V/V for the
MAX9938H, and 200V/V for the MAX9938W. The output
is protected from input overdrive by use of an output
current limiting circuit of 7mA (typical) and a 6V clamp
protection circuit.
GAIN (V/V)
R1 (
Ω)ROUT (kΩ)
200
100
20
100
10
50
200
10
25
400
10
Table 1. Internal Gain Setting Resistors (Typical Values)
Typical Operating Circuit
VBATT = 1.6V TO 28V
RSENSE
R1
ILOAD
ROUT
R1
GND
OUT
P
MAX9938
RS+
RS-
ADC
LOAD
μC
VDD = 3.3V
10k
Ω
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9938FELT+ | 制造商:Maxim Integrated Products 功能描述:1?A, 4-BUMP UCSP/SOT23, PRECISION CURRENT-SENSE AMPLIFIER - Rail/Tube |
| MAX9938FELT+T | 功能描述:电流灵敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9938FEUK+ | 制造商:Maxim Integrated Products 功能描述:1UA, 4-BUMP UCSP/SOT-23, PRECISION - Rail/Tube 制造商:Maxim Integrated Products 功能描述:PRECISION CURRENT-SENSE AMPLIFIER |
| MAX9938FEUK+T | 功能描述:电流灵敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9938HEBS+G45 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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