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參數(shù)資料
| 型號： | MIC4417 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | IttyBitty Low-Side MOSFET Driver(IttyBitty技術低邊MOS場效應管驅動器) |
| 中文描述： | IttyBitty低邊MOSFET驅動器（IttyBitty技術低邊馬鞍山場效應管驅動器） |
| 文件頁數(shù)： | 8/9頁 |
| 文件大小： | 107K |
| 代理商： | MIC4417 |
MIC4416
Application Information
The MIC4416/7 is designed to provide high peak current for
charging and discharging capacitive loads. The 1.2A peak
value is a nominal value determined under specific condi-
tions. This nominal value is used to compare its relative size
to other low-side MOSFET drivers. The MIC4416/7 is not
designed to directly switch 1.2A continuous loads.
Supply Bypass
Capacitors from VS to GND are recommended to control
switching and supply transients. Load current and supply
lead length are some of the factors that affect capacitor
size requirements.
A 4.7
μ
F or 10
μ
F tantalum capacitor is suitable for many
applications. Low-ESR (equivalent series resistance) metal-
ized film capacitors may also be suitable. An additional 0.1
μ
F
ceramic capacitor is suggested in parallel with the larger
capacitor to control high-frequency transients.
The low ESR (equivalent series resistance) of tantalum
capacitors makes them especially effective, but also makes
them susceptible to uncontrolled inrush current from low
impedance voltage sources (such as NiCd batteries or auto-
matic test equipment). Avoid instantaneously applying volt-
age, capable of very high peak current, directly to or near
tantalum capacitors without additional current limiting. Nor-
mal power supply turn-on (slow rise time) or printed circuit
trace resistance is usually adequate for normal product
usage.
Circuit Layout
Avoid long power supply and ground traces. They exhibit
inductance that can cause voltage transients (inductive kick).
Even with resistive loads, inductive transients can sometimes
exceed the ratings of the MOSFET and the driver.
When a load is switched off, supply lead inductance forces
current to continue flowing—resulting in a positive voltage
spike. Inductance in the ground (return) lead to the supply
has similar effects, except the voltage spike is negative.
Switching transitions momentarily draw current from VS to
GND. This combines with supply lead inductance to create
voltage transients at turn on and turnoff.
Transients can also result in slower apparent rise or fall times
when driver’s ground shifts with respect to the control input.
Minimize the length of supply and ground traces or use
ground and power planes when possible. Bypass capacitors
should be placed as close as practical to the driver.
MOSFET Selection
Standard MOSFET
A standard N-channel power MOSFET is fully enhanced with
a gate-to-source voltage of approximately 10V and has an
absolute maximum gate-to-source voltage of
±
20V.
The MIC4416/7’s on-state output is approximately equal to
the supply voltage. The lowest usable voltage depends upon
the behavior of the MOSFET.
Micrel
5-30
April 1998
VS
CTL
G
GND
MIC4416
4.7μF
+8V to +18V
1
3
2
4
L
Logic
Input
* Gate enhancement voltage
V
GS
*
+15V
Standard
MOSFET
IRFZ24
International Rectifier
100m
, 60V MOSFET
0.1μF
Try a
15
, 15W
or
1k, 1/4W
resistor
Figure 1. Using a Standard MOSFET
Logic-Level MOSFET
Logic-level N-channel power MOSFETs are fully enhanced
with a gate-to-source voltage of approximately 5V and have
an absolute maximum gate-to-source voltage of
±
10V. They
are less common and generally more expensive.
The MIC4416/7 can drive a logic-level MOSFET if the supply
voltage, including transients, does not exceed the maximum
MOSFET gate-to-source rating (10V).
VS
CTL
G
GND
MIC4416
+4.5V to 10V*
4.7μF
1
3
2
4
L
Logic
Input
* Gate enhancement voltage
(must not exceed 10V)
V
GS
*
+5V
Logic-Level
MOSFET
IRLZ44
28m
, 60V MOSFET
0.1μF
Try a
3
, 10W
or
100
, 1/4W
resistor
Figure 2. Using a Logic-Level MOSFET
At low voltages, the MIC4416/7’s internal P- and N-channel
MOSFET’s on-resistance will increase and slow the output
rise time. Refer to “Typical Characteristics” graphs.
Inductive Loads
On
Off
VS
CTL
G
GND
MIC4416
V
SUPPLY
1
3
2
4
Schottky
Diode
V
SWITCHED
4.7μF
0.1μF
Figure 3. Switching an Inductive Load
Switching off an inductive load in a low-side application forces
the MOSFET drain higher than the supply voltage (as the
inductor resists changes to current). To prevent exceeding
the MOSFET’s drain-to-gate and drain-to-source ratings, a
Schottky diode should be connected across the inductive
load.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4417BM4 | 制造商:Micrel Inc 功能描述: |
| MIC4417BM4 TR | 功能描述:IC DRIVER MOSF LOW SIDE SOT143-4 RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 外部開關 系列:IttyBitty® 標準包裝:50 系列:- 配置:高端 輸入類型:非反相 延遲時間:200ns 電流 - 峰:250mA 配置數(shù):1 輸出數(shù):1 高端電壓 - 最大（自引導啟動）:600V 電源電壓:12 V ~ 20 V 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-DIP 包裝:管件 其它名稱:*IR2127 |
| MIC4417BM4TR | 制造商:Micrel Inc 功能描述: |
| MIC4417YM4 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC4417YM4 TR | 功能描述:功率驅動器IC Low Cost Low-Side MOSFET Driver, Non-Inverting - Lead Free RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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