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| 型号： | MAX4373HEUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 放大器，比较器，参考 |
| 应用： | 电流感测，电源管理 |
| 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： | 1389 (CN2011-ZH PDF) |
MAX4373/MAX4374/MAX4375
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
10
______________________________________________________________________________________
Internal Comparator(s)
The MAX4373/MAX4374/MAX4375 contain an open-
drain output comparator for current limiting. The com-
parator’s negative terminal is connected to the internal
600mV reference. The positive terminal is accessible at
CIN1. When RESET is high, the internal latch is active,
and once CIN1 rises above 600mV, the output latches
into the open state. Pulsing RESET low for 1.5s resets
the latch, and holding RESET low makes the latch
transparent. See RESET
at Power-Up section
The MAX4374/MAX4375 contain an additional open-
drain comparator. The negative terminal of the
MAX4374’s additional comparator and the positive ter-
minal of the MAX4375’s additional comparator are con-
nected to the internal 600mV reference as shown in
Figure 1. The positive terminal of the MAX4374’s addi-
tional comparator and the negative terminal of the
MAX4375’s additional comparator are accessible at
CIN2.
___________Applications Information
Recommended Component Values
Ideally, the maximum load current will develop the full-
scale sense voltage across the current-sense resistor.
Choose the gain version needed to yield the maximum
output voltage required for the application:
where VSENSE is the full-scale sense voltage, 150mV for
gains of +20V/V and +50V/V or 100mV for a gain of
+100V/V. AV is the gain of the device. The minimum
supply voltage is VOUT + 0.25V. Note that the output for
the gain of +100V/V is internally clamped at 12V.
Calculate the maximum value for RSENSE so that the
differential voltage across RS+ and RS- does not
exceed the full-scale sense voltage:
Choose the highest value resistance possible to maxi-
mize VSENSE and thus minimize total output error.
In applications monitoring high current, ensure that
RSENSE is able to dissipate its own I
2R loss. If the resis-
tor’s power dissipation is exceeded, its value may drift
or it may fail altogether, causing a differential voltage
across the terminals in excess of the absolute maxi-
mum ratings. Use resistors specified for current-sens-
ing applications.
Overcurrent Protection Circuit
The overcurrent protection circuit, shown in Figure 2,
uses the MAX4373 to control an external P-channel
MOSFET. The MOSFET controlled by the MAX4373
opens the current path under overload conditions. The
latched output of the MAX4373’s comparator prevents
the circuit from oscillating, and the pushbutton resets
the current path after an overcurrent condition.
Window Detection Circuit
Figure 3 shows a simple circuit suitable for window
detection. Let IOVER be the minimum load current
(ILOAD) required to cause a low state at COUT2, and let
IUNDER be the maximum load current required to cause
a high state at COUT1:
where AV is the gain of the device and VREF is the inter-
nal reference voltage (0.6V typ).
Connect COUT1 and COUT2; the resulting comparator
output will be high when the current is inside the cur-
rent window and low when the current is outside the
window. The window is defined as load currents less
than IOVER and greater than IUNDER.
RS-
RS+
OUT
CIN1
LOAD
MAX4373
GND
COUT1
RESET
PUSHBUTTON
VCC
2.7V TO 5.5V
R
C
Figure 2. MAX4373 Overcurrent Protection Circuit
VV
A
OUT
SENSE
V
=
×
R
V
I
SENSE MAX
LOAD
SENSE MAX
()
=
I
V
RA
RR
R
and
I
V
RA
RR
R
UNDER
REF
SENSE
V
OVER
REF
SENSE
V
=
+
=
+
×
45
5
12
2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4373HEUA+ | 功能描述:电流灵敏放大器 uPower High-Side 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 |
| MAX4373HEUA+T | 功能描述:电流灵敏放大器 uPower High-Side 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 |
| MAX4373HEUA-T | 功能描述:电流灵敏放大器 uPower High-Side 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 |
| MAX4373TESA | 功能描述:电流灵敏放大器 uPower High-Side 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 |
| MAX4373TESA+ | 功能描述:电流灵敏放大器 uPower High-Side 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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