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| 型号： | MIC4427YM |
| 厂商： | Micrel Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER MOSFET DUAL 1.5A 8SOIC |
| 标准包装： | 95 |
| 配置： | 低端 |
| 输入类型： | 非反相 |
| 延迟时间： | 17ns |
| 电流 - 峰： | 1.5A |
| 配置数： | 2 |
| 输出数： | 2 |
| 电源电压： | 4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1110 (CN2011-ZH PDF) |
| 其它名称： | 576-1525-5 MIC4427YM-ND |
MIC4426/4427/4428
Applications Information
Supply Bypassing
Large currents are required to charge and discharge large
capacitive loads quickly. For example, changing a 1000pF
load by 16V in 25ns requires 0.8A from the supply input.
To guarantee low supply impedance over a wide frequency
range, parallel capacitors are recommended for power supply
bypassing. Low-inductance ceramic MLC capacitors with short
lead lengths (< 0.5”) should be used. A 1.0μF ?lm capacitor
in parallel with one or two 0.1μF ceramic MLC capacitors
normally provides adequate bypassing.
Grounding
When using the inverting drivers in the MIC4426 or MIC4428,
individual ground returns for the input and output circuits or
a ground plane are recommended for optimum switching
speed. The voltage drop that occurs between the driver ’s
ground and the input signal ground, during normal high-cur-
rent switching, will behave as negative feedback and degrade
switching speed.
Control Input
Unused driver inputs must be connected to logic high (which
can be V S ) or ground. For the lowest quiescent current
(< 500μA) , connect unused inputs to ground. A logic-high
signal will cause the driver to draw up to 9mA.
The drivers are designed with 100mV of control input hys-
teresis. This provides clean transitions and minimizes output
stage current spikes when changing states. The control input
voltage threshold is approximately 1.5V. The control input
recognizes 1.5V up to V S as a logic high and draws less than
1μA within this range.
Micrel, Inc.
Power Dissipation
Power dissipation should be calculated to make sure that the
driver is not operated beyond its thermal ratings. Quiescent
power dissipation is negligible. A practical value for total
power dissipation is the sum of the dissipation caused by the
load and the transition power dissipation (P L + P T ).
Load Dissipation
Power dissipation caused by continuous load current (when
driving a resistive load) through the driver ’s output resistance
is:
P L = I L2 R O
For capacitive loads, the dissipation in the driver is:
P L = f C L V S2
Transition Dissipation
In applications switching at a high frequency, transition power
dissipation can be signi?cant. This occurs during switching
transitions when the P-channel and N-channel output FETs
are both conducting for the brief moment when one is turning
on and the other is turning off.
P T = 2 f V S Q
Charge (Q) is read from the following graph:
1×10 -8
8×10 -9
6×10 -9
4×10 -9
3×10 -9
2×10 -9
The MIC4426/7/8 drives the TL494, SG1526/7, MIC38C42,
TSC170 and similar switch-mode power supply integrated
circuits.
1×10 -9
4
6
8 10 12 14
SUPPLY VOLTAGE (V)
16
18
Crossover Energy Loss per Transition
April 2008
7
M9999-042108
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4427YM TR | 功能描述:功率驱动器IC 1.5A Dual High Speed MOSFET Driver (Pb-Free) RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MIC4427YM | 制造商:Micrel Inc 功能描述:MOSFET Driver IC |
| MIC4427YMM | 功能描述:功率驱动器IC 1.5A Dual High Speed MOSFET Driver (Pb-Free) RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MIC4427YMM TR | 功能描述:功率驱动器IC 1.5A Dual High Speed MOSFET Driver (Pb-Free) RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MIC4427YMMTR | 制造商:Micrel 功能描述:MOSFET Driver 0.025V 1.5A Non-Inv |
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