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PDF MIC5018 Data sheet ( Hoja de datos )
| Número de pieza | MIC5018 | |
| Descripción | IttyBitty High-Side MOSFET Driver Preliminary Information | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC5018 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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MIC5018
Micrel
MIC5018
IttyBitty™ High-Side MOSFET Driver
Preliminary Information
General Description
The MIC5018 IttyBitty™ high-side MOSFET driver is de-
signed to switch an N-channel enhancement-type MOSFET
from a TTL compatible control signal in high- or low-side
switch applications. This driver features the tiny 4-lead
SOT-143 package.
The MIC5018 is powered from a +2.7V to +9V supply and
features extremely low off-state supply current. An internal
charge pump drives the gate output higher than the driver
supply voltage and can sustain the gate voltage indefinitely.
An internal zener diode limits the gate-to-source voltage to a
safe level for standard N-channel MOSFETs.
In high-side configurations, the source voltage of the MOS-
FET approaches the supply voltage when switched on. To
keep the MOSFET turned on, the MIC5018’s output drives
the MOSFET gate voltage higher than the supply voltage. In
a typical high-side configuration, the driver is powered from
the load supply voltage. Under some conditions, the MIC5018
and MOSFET can switch a load voltage that is slightly higher
than the driver supply voltage.
In a low-side configuration, the driver can control a MOSFET
that switches any voltage up to the rating of the MOSFET.
The gate output voltage is higher than the typical 3.3V or 5V
logic supply and can fully enhance a standard MOSFET.
The MIC5018 is available in the SOT-143 package and
is rated for –40°C to +85°C ambient temperature range.
Features
• +2.7V to +9V operation
• 150µA typical supply current at 5V supply
• ≤ 1µA typical standby (off) current
• Charge pump for high-side low-voltage applications
• Internal zener diode gate-to-ground MOSFET protection
• Operates in low- and high-side configurations
• TTL compatible input
• ESD protected
Applications
• Battery conservation
• Power bus switching
• Solenoid and motion control
• Lamp control
Ordering Information
Part Number
MIC5018BM4
Temp. Range
–40°C to +85°C
Package
SOT-143
Marking
H10
5
Typical Applications
+5V
4.7µF
On
Off
MIC5018
2
VS
3
G
4 CTL GND 1
* International Rectifier
100mΩ, 17A max.
TO-220 package
IRFZ24*
N-Channel
MOSFET
Low-Voltage High-Side Power Switch
‡ Load voltage limited only by
VLOAD
‡
SUPPLY
MOSFET drain-to-source rating
* Siliconix
30mΩ, 7A max., 30V VDS max.
8-lead SOIC package
+2.7 to +9V
4.7µF
On
Off
MIC5018
2 VS
G3
4 CTL GND 1
Si9410DY*
N-channel
MOSFET
Low-Side Power Switch
1997
5-155
1 page  
MIC5018
Functional Diagram
+2.7V to +9V
Micrel
VS
I1
20µA
D2
35V
Q1
On CTL R1 2k
Off
D1
16V
Q2
R2
15k
EN CHARGE
PUMP
MIC5018
G
D3 16V
Q3
GND
Functional Diagram with External Components
(High-Side Driver Configuration)
Functional Description
Refer to the functional diagram.
The MIC5018 is a noninverting device. Applying a logic high
signal to CTL (control input) produces gate drive output. The
G (gate) output is used to turn on an external N-channel
MOSFET.
Supply
VS (supply) is rated for +2.7V to +9V. An external capacitor
is recommended to decouple noise.
Control
CTL (control) is a TTL compatible input. CTL must be forced
high or low by an external signal. A floating input may cause
unpredictable operation.
A high input turns on Q2, which sinks the output of current
source I1, making the input of the first inverter low. The
inverter output becomes high enabling the charge pump.
Charge Pump
The charge pump is enabled when CTL is logic high. The
charge pump consists of an oscillator and voltage quadrupler
(4×). Output voltage is limited to 16V by a zener diode. The
charge pump output voltage will be approximately:
VG = 4 × VSUPPLY – 2.8V, but not exceeding 16V.
The oscillator operates from approximately 70kHz to approxi-
mately 100kHz depending upon the supply voltage and
temperature.
Gate Output
The charge pump output is connected directly to the G (gate)
output. The charge pump is active only when CTL is high.
When CTL is low, Q3 is turned on by the second inverter and
discharges the gate of the external MOSFET to force it off.
If CTL is high, and the voltage applied to VS drops to zero, the
gate output will be floating (unpredictable).
ESD Protection
D1 and D2 clamp positive and negative ESD voltages. R1
isolates the gate of Q2 from sudden changes on the CTL
input. Q1 turns on if the emitter (CTL input) is forced below
ground to provide additional input protection. Zener D3 also
clamps ESD voltages for the gate (G) output.
5
1997
5-159
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MIC5018.PDF ] | |
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