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| 型号： | MAX4072AUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 8-UMAX |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 100kHz |
| 电流 - 输入偏压： | 2.4µA |
| 电压 - 输入偏移： | 80µV |
| 电流 - 电源： | 100µA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 24 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
| 产品目录页面： | 1387 (CN2011-ZH PDF) |
Detailed Description
The MAX4069–MAX4072 bidirectional, high-side, cur-
rent-sense amplifiers are ideal for portable equipment.
The wide 1.35V to 24V input common-mode voltage
range is independent of the supply voltage, ensuring
that the current-sense feedback remains accurate even
when connected to a battery pack in deep discharge.
The MAX4069/MAX4071/MAX4072 operate from a 2.7V
to 24V single supply. Because the MAX4070 has a 2.5V
internal reference, it operates from 3.6V to 24V. All
devices have a low 100A supply current that reduces
to only 10A (typ) in shutdown mode. To achieve maxi-
mum flexibility, an external current-sense resistor is
used along with a gain select pin (GSEL) to choose
either 50V/V or 100V/V. Drive GSEL low to select gain of
50V/V or drive GSEL high to choose gain of 100V/V
(see
Functional Diagram). The MAX4069 has an
adjustable reference voltage set by two external resis-
tors between REFOUT and ADJ, and GND pins. The
MAX4070 contains an internal 2.5V reference. The
MAX4071 is similar to the MAX4070 but with a fixed
internal reference voltage of 1.5V. The MAX4072 has a
reference input pin to allow use of external references.
Charging current is represented by an output voltage
from the reference voltage to VCC, while discharge cur-
rent is given from the reference voltage to GND. The
direction of VSENSE is totally arbitrary.
The input stage of the MAX4069–MAX4072 is shown in
Figure 1. Its unique topology allows for monitoring bidi-
rectional currents through the sense resistor (RSENSE). If,
for instance, current flows from RS+ to RS-, the
MAX4069–MAX4072 match for the voltage drop over the
external sense resistor (RSENSE) by increasing the cur-
rent through the internal Q1 and RG1. At the same time,
the current through Q2 and RG2 decreases, however,
internal circuitry not shown in Figure 1 prevents Q2 from
turning off completely. Likewise, if current flows from RS-
to RS+, the current through Q2 and RG2 increases and
the current through Q1 decreases. In this way, the volt-
ages at the input terminals of the internal amplifier A1 are
kept constant and an accurate measurement of the sense
voltage is achieved. In the following amplifier stages of
the MAX4069–MAX4072, the output signal of amplifier A2
is level-shifted towards the reference voltage (VREF),
resulting in a voltage at the output pin (OUT) that swings
above the VREF voltage for positive-sense voltages and
below VREF for negative-sense voltages.
Applications Information
Bidirectional, Current-Sense Amplifier
Systems such as laptop computers and other devices
that have internal charge circuitry require a precise bidi-
rectional, current-sense amplifier to accurately monitor
the battery’s current regardless of polarity. Figure 2
shows the MAX4069–MAX4072 used as a bidirectional
current monitor. In Figure 2, the direction of VSENSE is
assigned to charge and discharge, assuming charge is
greater than discharge. The practical choice of direction
is based on dynamic range at OUT, given that the range
of REF to VCC is usually greater than from REF to
ground. This is useful for implementing either smart bat-
tery packs or fuel gauges.
High-Current Measurement
The MAX4069–MAX4072 can achieve high-current
measurements by using low-value sense resistors,
which can be paralleled to further increase the current-
sense limit.
Adjusting VREF (MAX4069)
The MAX4069 has an output reference voltage that can
be set to a desired voltage by a two-resistor divider
between REFOUT, ADJ, and GND. If REFOUT and ADJ
are connected together, the minimum output reference
voltage is obtained, 1.23V (typ). The maximum voltage
for REFOUT is 4V (that requires VCC ≥ 5.1V). The rec-
ommended range for the external resistors is: R1 + R2
should be > 20k and < 500k.
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
MAX4069–MAX4072
RSENSE
RS-
RS+
RG2
RG1
A1
A2
Q1
Q2
IOUT
OUT
Figure 1. Detailed Input Stage
Note:
RG1 = RG2 = 104k (typ).
MAX4069–MAX4072
10
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4072AUA+ | 功能描述:电流灵敏放大器 Bidirectional High Side Crnt-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 |
| MAX4072AUA+T | 功能描述:电流灵敏放大器 Bidirectional High Side Crnt-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 |
| MAX4072AUA-T | 功能描述:电流灵敏放大器 Bidirectional High Side Crnt-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 |
| MAX4072AUA-TG075 | 制造商:Maxim Integrated Products 功能描述:BIDIRECTIONAL, HIGH-SIDE, CURRENT-SENSE AMPLI - Tape and Reel |
| MAX4073 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
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