SC1205
High Speed Synchronous
Power MOSFET Driver
POWER MANAGEMENT
Features
Description
The SC1205 is a cost effective Dual MOSFET Driver de-
signed for switching High and Low side Power MOSFETs.
Each driver is capable of driving a 3000pF load in 20ns
max rise/fall time and has a 20ns max propagation de-
lay from input transition to the gate of the power FET’s.
An internal Overlap Protection circuit prevents shoot-
through from Vin to GND in the main and synchronous
MOSFET’s. The Adaptive Overlap Protection circuit en-
sures the Bottom FET does not turn on until the Top FET
source has reached a voltage low enough to prevent
cross-conduction.
Fast rise and fall times (15ns typical with 3000pf
load)
3 Amp peak drive current
14ns max Propagation delay (BG going low)
Adaptive Non-overlapping Gate Drives provide
shoot-through protection
Floating top drive switches up to 25V
Under-Voltage lock-out
Overtemperature protection
Less than 10µA supply current when EN is low
Low cost
The high current drive capability (3A peak) allows fast
switching, thus reducing switching losses at high (up to
1MHz) frequencies without overheating the driver. The
high voltage CMOS process allows operation from 5-25
Volts at top MOSFET drain, thus making SC1205 suit-
able for battery powered applications. Connecting En-
able pin (EN) to logic low shuts down both drives and
reduces operating current to less than 10uA.
Applications
High Density sunchronous power supplies
Motor Drives/Class-D amps/Half bridge drivers
High frequency (to 1.2 MHz) operation allows use
of small inductors and low cost caps in place of
electrolytics
High efficiency portable computers
Battery powered applications
An Under-Voltage-Lock-Out circuit is included to guaran-
tee that both driver outputs are low when the 5V logic
level is less than or equal to 4.4V (typ) at supply ramp up
(4.35V at supply ramp down). An Internal temperature
sensor shuts down all drives in the event of
overtemperature. SC1205 is fabricated utilizing Bi-CMOS
technology for low quiescent current. The SC1205 is of-
fered in a standard SO-8 package.
Typical Application Circuit
2.5m
Vin 5-12V
10u,CER
2200uf
10nf
10
70N03
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VID4
VID3
VID2
VID1
VID0
ERROUT
FB
VCC
BGOUT
OC+
TG
+5V
VS
EN
DRN
70N03
BG
OUT1
OUT2
OC-
CO
SC1205
70N03
UVLO
GND
TG
Rf
RREF
VS
EN
CO
DRN
70N03
Rref
BG
SC2422A
Ri
SC1205
Vcore, 1.7v,40A
1
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Revision: September 22, 2004