MIC4120 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – 6A-Peak Low-Side MOSFET Driver

MIC4120/4129
Micrel
MIC4120/4129
6A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
MIC4120 and MIC4129 MOSFET drivers are tough, effi-
cient, and easy to use. The MIC4129 is an inverting driver,
while the MIC4120 is a non-inverting driver. The MIC4120
and MIC4129 are improved versions of the MIC4420 and
MIC4429.
They are capable of 6A (peak) output and can drive the
largest MOSFETs with an improved safe operating margin.
The MIC4120/4129 accept any logic input from 2.4V to V_S
without external speed-up capacitors or resistor networks.
Proprietary circuits allow the input to swing negative by as
much as 5V without damaging the part. Additional circuits
protect against damage from electrostatic discharge.
MIC4120/4129 drivers can replace three or more discrete
components, reducing PCB area requirements, simplifying
product design, and reducing assembly cost.
Modern BiCMOS/DMOS construction guarantees freedom
from latch-up. The rail-to-rail swing capability insures ad-
equate gate voltage to the MOSFET during power up/down
sequencing.
Features
• CMOS Construction
• Latch-Up Protected: Will Withstand >500mA
Reverse Output Current
• Logic Input Withstands Negative Swing of Up to 5V
• Matched Rise and Fall Times ................................ 25ns
• High Peak Output Current ............................... 6A Peak
• Wide Operating Range ............................... 4.5V to 20V
• High Capacitive Load Drive ............................10,000pF
• Low Delay Time .............................................. 55ns Typ
• Logic High Input for Any Voltage From 2.4V to V_S
• Low Equivalent Input Capacitance (typ) ..................6pF
• Low Supply Current ...............450µA With Logic 1 Input
• Low Output Impedance ......................................... 2.5Ω
• Output Voltage Swing Within 25mV of Ground or V_S
• Exposed backside pad packaging reduces heat
- ePAD SOIC-8L (θ_JA = 58°C/W)
- ePAD MSOP-8L (θ_JA = 60°C/W)
- 3mm x 3mm MFL™-8L (θ_JA = 60°C/W)
Applications
• Switch Mode Power Supplies
• Motor Controls
• Pulse Transformer Driver
• Class-D Switching Amplifiers
Functional Diagram
0.1mA
IN
2kΩ
V_S
0.4mA
MIC4129
INVERTING
MIC4120
NONINVERTING
GND
OUT
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
December 2004
1
M9999-123104