Datasheet

Features
• Gate drive supply range from 12 to 18V
• Undervoltage lockout
• Current detection and limiting loop to limit driven
power transistor current
• Error lead indicates fault conditions and programs
shutdown time
• Output in phase with input
• 2.5V, 5V and 15V input logic compatible
• Also available LEAD-FREE
Description
The IR2121 is a high speed power MOSFET and
IGBT driver with over-current limiting protection cir-
cuitry. Latch immune CMOS technology enables rug-
gedized monolithic construction. Logic inputs are
compatible with standard CMOS or LSTTL outputs,
down to 2.5V logic. The output driver features a
high pulse current buffer stage designed for mini-
mum cross-conduction. The protection circuitry de-
tects over-current in the driven power transistor and
limits the gate drive voltage. Cycle-by-cycle shut-
down is programmed by an external capacitor which
Data Sheet No. PD60018
-
M
CURRENT LIMITING LOW SIDE DRIVER
Product Summary
V
OFFSET
5V max.
I
O
+/- 1A / 2A
V
OUT
12 - 18V
V
CSth
230 mV
t
on/off
(typ.) 150 & 150 ns
Package
Typical Connection
8-Lead PDIP
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
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












IR2121
& (PbF)
www.irf.com 1
(Refer to Lead
Assignments for correct
pin configuration). This/
These diagram(s) show
electrical connections
only. Please refer to our
Application Notes and
DesignTips for proper
circuit board layout.
directly controls the time interval between detection of the over-current limiting condition and latched shut-
down. The output can be used to drive an N-channel power MOSFET or IGBT in the low side configuration.