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參數(shù)資料
| 型號： | MAX4291 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra-Small, !.8V, レPower, Rail-to-Rail I/O Op Amps |
| 中文描述： | 超小型、+1.8V、微功耗、滿擺幅輸入/輸出運算放大器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 397K |
| 代理商： | MAX4291 |
M
used as a comparator, the output stage is overdriven
and the current through the biasing circuitry increases
to maximum. For the MAX4291, typical supply currents
increase to 1.5mA with V
CC
= 1.8V and to 9mA when
V
CC
= 5.0V (Figure 10).
Using the MAX4291/MAX4292/MAX4294
as Low-Power Current Monitors
The MAX4291/MAX4292/MAX4294 are ideal for appli-
cations powered from a two-cell battery stack. Figure
11 shows an application circuit in which the MAX4291
is used for monitoring the current of a two-cell battery
stack. In this circuit, a current load is applied, and the
voltage drop at the battery terminal is sensed.
The voltage on the load side of the battery stack is
equal to the voltage at the emitter of Q1 due to the
feedback loop containing the op amp. As the load cur-
rent increases, the voltage drop across R1 and R2
increases. Thus, R2 provides a fraction of the load cur-
rent (set by the ratio of R1 and R2) that flows into the
emitter of the PNP transistor. Neglecting PNP base cur-
rent, this current flows into R3, producing a ground-ref-
erenced voltage proportional to the load current. To
minimize errors, scale R1 to give a voltage drop that is
large enough in comparison to the op amp’s V
OS
.
Calculate the output voltage of the application using
the following equation:
For a 1V output and a current load of 50mA, the choice
of resistors can be R1 = 2
, R2 = 100k
, and R3 =
1M
.
V
I
R1
R2
R3
OUT
LOAD
=
×
×
Ultra-Small, +1.8V, μPower,
Rail-to-Rail I/O Op Amps
12
______________________________________________________________________________________
0
60
90
20
30
10
40
50
80
70
100
PROPAGATION DELAY
vs. INPUT OVERDRIVE
V
OD
(mV)
10
100
1000
P
μ
s
t
PD
+
,
V
CC
= 5.5V
t
PD
-
,
V
CC
= 5.5V
t
PD
+
,
V
CC
= 1.8V
t
PD
-
,
V
CC
= 1.8V
Figure 8. Propagation Delay vs. Input Overdrive
R2
R1
V
SIG
OUTPUT
INPUT
V
OH
V
OL
V
EE
= GND
V
CC
V
OUT
R
HYST
V
EE
= GND
MAX4291
MAX4292
MAX4294
HYSTERESIS
V
LO
V
HI
V
REF
Figure 9. Hysteresis Comparator Circuit
0
6
2
4
8
10
12
0
2 2.5 3
SUPPLY VOLTAGE (V)
1
0.5
1.5
3.5
4.5
5
4
5.5
MAXIMUM SUPPLY CURRENT
vs. SUPPLY VOLTAGE
M
COMPARATOR CONFIGURATION
V
IN
+
= (V
IN
-) - 100mV
Figure 10. Maximum Supply Current vs. Supply Voltage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4291EUK-T | Ultra-Small, !.8V, レPower, Rail-to-Rail I/O Op Amps |
| MAX4292 | Ultra-Small, !.8V, レPower, Rail-to-Rail I/O Op Amps |
| MAX4294 | Ultra-Small, !.8V, レPower, Rail-to-Rail I/O Op Amps |
| MAX4310EUA | High-Speed, Low-Power, Single-Supply, Multichannel, Video Multiplexer-Amplifiers |
| MAX4310ESA | High-Speed, Low-Power, Single-Supply, Multichannel, Video Multiplexer-Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4291ESA | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4291ESA-T | 制造商:Maxim Integrated Products 功能描述:1.8V, MICROPOWER, RAIL-TO-RAIL OP AMP IN SC70 - Tape and Reel |
| MAX4291EUK | 制造商:Maxim Integrated Products 功能描述:1.8V MICROPOWER RAIL-TO-RAIL OP A - Cut Tape Product |
| MAX4291EUK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R I/O 2.75V/5.5V 5PIN SOT-23 - Rail/Tube |
| MAX4291EUK+T | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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