5-32 April 1998
MIC4420/4429 Micrel
MIC4420/4429
6A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
MIC4420, MIC4429 and MIC429 MOSFET drivers are
tough, efficient, and easy to use. The MIC4429 and MIC429
are inverting drivers, while the MIC4420 is a non-inverting
driver.
They are capable of 6A (peak) output and can drive the
largest MOSFETs with an improved safe operating mar-
gin. The MIC4420/4429/429 accepts 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 electro-
static discharge.
MIC4420/4429/429 drivers can replace three or more dis-
crete 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 18V
• 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
Applications
• Switch Mode Power Supplies
• Motor Controls
• Pulse Transformer Driver
• Class-D Switching Amplifiers
Functional Diagram
IN
OUT
MIC4429
INVERTING
MIC4420
NON-INVERTING
0.1mA
0.4mA
2kΩ
V
S
GND
