參數(shù)資料
型號(hào)： MAX44268EWL+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 3/15頁(yè)
文件大?。?/td> 0K
描述： IC COMPARATOR W/REF DUAL 9WLP
產(chǎn)品培訓(xùn)模塊： Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類型： 通用
元件數(shù)： 2
輸出類型： 開路漏極
電壓 - 電源，單路/雙路(±)： 1.8 V ~ 5.5 V
電壓 - 輸入偏移（最小值）： 5mV @ 5V
電流 - 輸入偏壓（最小值）： 0.15nA
電流 - 輸出（標(biāo)準(zhǔn)）： 50mA
電流 - 靜態(tài)（最大值）： 1.15µA
CMRR, PSRR（標(biāo)準(zhǔn)）： 80dB PSRR
傳輸延遲（最大）： 39µs
磁滯： 6mV
工作溫度： -40°C ~ 85°C
封裝/外殼： 9-WFBGA，WLBGA
安裝類型： 表面貼裝
包裝： 帶卷 (TR)
Maxim Integrated Products 11
MAX44268
1.3mm x 1.3mm, Low-Power
Dual Comparator with Reference
Power-On-Reset Circuit
The IC can be used to make a power-on-reset circuit as
displayed in Figure 5. The negative input provides the
ratiometric reference with respect to the power supply
and is created by a simple resistive divider. Choose
reasonably large values to minimize the power consump-
tion in the resistive divider. The positive input provides
the power-on delay time set by the time constant of the
RC circuit formed by R2 and C1. This simple circuit can
be used to power up the system in a known state after
ensuring that the power supply is stable. Diode D1 pro-
vides a rapid reset in the event of unexpected power loss.
If using comparator A, R3 and R4 are not populated and
REF settles in approximately 100s.
Relaxation Oscillator
The IC can also be used to make a simple relaxation
oscillator (Figure 6) using comparator B. By adding the
RC circuit R5 and C1, a standard Schmidt Trigger circuit
referenced to a set voltage is converted into an astable
multivibrator. As shown in Figure 7, IN- is a sawtooth
waveform with capacitor C1 alternately charging and
discharging through resistor R5. The external hysteresis
network formed by R1 to R4 defines the trip voltages as:
T_RISE
CC
T_FALL
CC
R3 x R4
V
R2R3 R2R4 R3R4
R4R5(R1 R2 R3)
R1R3R4
V
R4R5(R1 R2 R3) R1R3R4
R2(R1R3 R3R5 R1R5)
=
+
++
+
=
++
+
+
++
Using the basic time domain equations for the charging
and discharging of an RC circuit, the logic-high time,
logic-low time, and frequency can be calculated as:
=
T_FALL
LOW
T_RISE
V
R5C1 ln
t
V
Since the comparator’s output is open drain, it goes to
high impedance corresponding to logic-high. So, when
the output is at logic-high, the C1 capacitor charges
through the resistor network formed by R1 to R5. An
accurate calculation of tHIGH would have involved
applying thevenin’s theorem to compute the equivalent
thevenin voltage (VTHEVENIN) and thevenin resistance
Figure 6. Relaxation Oscillator
Figure 5. Power-On Reset Circuit
Figure 4. Logic-Level Translator
VCC
R3
R2
R4
R5
R1
GND
OUT
MAX44268
VCC
C1
VCC
R3
R2
D1
R4
C1
R1
GND
RESET
MAX44268
VCC
VPULL
VIN
VREF
GND
OUT
R1
MAX44268
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX44269EWL+ 制造商:Maxim Integrated Products 功能描述:
MAX44269EWL+T 功能描述:校驗(yàn)器 IC Dual Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX4426C/D 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX4426C/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX4426C/D+ 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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