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參數資料
| 型號： | MAX9938EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 11/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR MAX9938 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 每 IC 通道數： | 1 - 單 |
| 放大器類型： | 電流檢測 |
| -3db帶寬： | 60kHz |
| 工作溫度： | -40°C ~ 85°C |
| 電流供應（主 IC）： | 1.1µA |
| 電壓 - 電源，單路/雙路(±)： | 1.6 V ~ 28 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX9938 |
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9938EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX9938 Eval Kit RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓: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:電流靈敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道數量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX9938FEBS+TG45 | 功能描述:電流靈敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道數量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX9938FELT+ | 制造商:Maxim Integrated Products 功能描述:1?A, 4-BUMP UCSP/SOT23, PRECISION CURRENT-SENSE AMPLIFIER - Rail/Tube |
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