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| 型号： | MAX9937AXK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 350kHz |
| 电流 - 输入偏压： | 2µA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 20µA |
| 电流 - 输出 / 通道： | 22mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1392 (CN2011-ZH PDF) |
| 其它名称： | MAX9937AXK+TDKR |
MAX9937
Automotive Current-Sense Amplifier
with Reverse-Battery Protection
10
______________________________________________________________________________________
At frequencies below the output corner frequency, the
MAX9937 itself provides excellent 100dB (DC) com-
mon-mode rejection. At higher frequencies, as the
CMRR of the MAX9937 degrades, the output filter
formed by ROUT and COUT helps boost the common-
mode rejection of the circuit.
Input Common-Mode Voltages
> 28V and < 0V
Short-duration overvoltages on the battery line are iso-
lated from the RSP and RSN pins of the MAX9937 by
the use of input resistors RRSP and RRSN. The input
ESD clamp structure is designed so that the device can
withstand short-duration (< 1s) overvoltages up to 40V
when using resistors RRSP and RRSN of 500Ω or greater
as shown in the
Typical Application Circuit.
Approximately 40mA flows out of each ESD diode dur-
ing this condition (20V/500
Ω). This current is less than
the 50mA absolute maximum specification for the RSN
and RSP pins.
Skewed Input Offset Voltage
for Production Calibration
Due to low temperature drift of input bias current and
input offset voltage in the MAX9937, the part can be
used to provide powerful application and system bene-
fits not normally attainable from other current-sense
amplifiers on the market. For example, input resistors
RRSP and RRSN can be intentionally mismatched so as
to introduce an external, controlled input offset voltage
into the circuit. Doing so allows microcontroller firmware
to trim out input offset voltages completely by using
production-line calibration during the manufacturing
process or in system operation as long as a zero load-
current condition is forced. Only minimal temperature-
drift-based errors in the resistor and in the bias currents
then remain.
VOS-FINAL = VOS + IB- x RRSN - IB+ x RRSP
while gain = ROUT/RRSP.
Since gain can be fixed by choosing ROUT and RRSP, a
positive offset voltage can be induced by varying the
value of RRSN compared to RRSP.
For example:
ROUT = 10kΩ, RRSP = 500Ω fixes gain = 20V/V. Now,
choosing RRSN = 2.5kΩ, and knowing ΔIB= ±12% of IB,
the additional VOS becomes:
ΔVOS (max) = (5.6A x 2500) ± (0.12 x 5.6A x 2500) -
(5.6A x 500) = 11.2mV ± 1.7mV
ΔVOS (min) = (0.8A x 2500) ± (0.12 x 0.8A x 2500) -
(0.8A x 500) = 1.6mV ± 0.24mV
Since the minimum extra VOS introduced into the part is
greater than the maximum VOS of the current-sense
amplifier (= 1mV), the output of the current-sense
amplifier is always greater than zero even at zero sense
voltage, thus allowing the current-sense amplifier to be
calibrated at zero input current.
Operation with VCC = 0V (Shutdown)
The input terminals go into a high-impedance mode
when VCC = 0, as shown by the input bias current in
shutdown 1A specification. Due to the low 20A sup-
ply current, this then becomes a convenient way to put
the amplifier in shutdown simply by using a digital I/O
port of a microcontroller to power up/down the current-
sense amplifier. This can be especially useful in certain
battery-operated applications that need to implement
flexible power-management schemes.
GND
RSN
OUT
1
5
RSP
VCC
MAX9937
SC70
TOP VIEW
2
34
+
Pin Configuration
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
5 SC70
X5+1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9937EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9937 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9938EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9938 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9938FEBS+G45 | 制造商:Maxim Integrated Products 功能描述:1?A, 4-BUMP UCSP/SOT23,PRECISION CURRENT-SENSE AMPLIFIER - Rail/Tube |
| MAX9938FEBS+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 |
| MAX9938FEBS+TG45 | 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 |
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