MAX4291/MAX4292/MAX4294 When the output of the comparator is low, the supply current increases. The out" />
參數(shù)資料
型號(hào): MAX4292ESA+
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 4/18頁(yè)
文件大?。?/td> 0K
描述: IC OP AMP R-R I/O 8-SOIC
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 100
放大器類(lèi)型: 通用
電路數(shù): 2
輸出類(lèi)型: 滿(mǎn)擺幅
轉(zhuǎn)換速率: 0.2 V/µs
增益帶寬積: 500kHz
電流 - 輸入偏壓: 15nA
電壓 - 輸入偏移: 200µV
電流 - 電源: 100µA
電流 - 輸出 / 通道: 20mA
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5.5 V,±0.9 V ~ 2.75 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 管件
MAX4291/MAX4292/MAX4294 When the output of the comparator is low, the supply
current increases. The output stage has biasing circuit-
ry to monitor the output current. When the amplifier is
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 VCC = 1.8V and to 9mA when
VCC = 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 VOS.
Calculate the output voltage of the application using
the following equation:
VI
R1
R2
R3
OUT
LOAD
×
Ultra-Small, 1.8V, Power,
Rail-to-Rail I/O Op Amps
12
______________________________________________________________________________________
060
90
20
30
10
40
50
80
70
100
PROPAGATION DELAY
vs. INPUT OVERDRIVE
VOD (mV)
10
100
1000
t
PD
(
s)
tPD+, VCC = 5.5V
tPD-, VCC = 5.5V
tPD+, VCC = 1.8V
tPD-, VCC = 1.8V
Figure 8. Propagation Delay vs. Input Overdrive
R2
R1
VSIG
OUTPUT
INPUT
VOH
VOL
VEE = GND
VCC
VOUT
RHYST
VEE = GND
MAX4291
MAX4292
MAX4294
HYSTERESIS
VLO
VHI
VREF
Figure 9. Hysteresis Comparator Circuit
0
6
2
4
8
10
12
0
2.0 2.5 3.0
1.0
0.5
1.5
3.5
4.5 5.0
4.0
5.5
MAXIMUM SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
MAXIMUM
SUPPLY
CURRENT
(mA)
COMPARATOR CONFIGURATION
VIN+ = (VIN-) - 100mV
Figure 10. Maximum Supply Current per Amplifier vs. Supply
Voltage
V
1
R1
R2
R1
R
V
R1
R
V
HYST
HI
LO
HI
HYST
REF
LO
HI
HYST
CC
=
=+
+
=
相關(guān)PDF資料
PDF描述
MAX4292ESA IC OPAMP 1.8VU R/R I/O 8-SOIC
RL1218JK-070R091L RES 0.091 OHM 1W 5% 1218 SMD
89006-111LF CONN HEADER 30POS STR PCB PRSFT
MP2-S030-51M1-C-LR CONN SOCKET R/A 5R0W 30POS SLD
PF0805FRM7P0R02L RES 0.02 OHM 1/8W 1% 0805 SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4292ESA+ 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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
MAX4292ESA+T 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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
MAX4292ESA-T 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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
MAX4292EUA 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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
MAX4292EUA+ 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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