SC420A Datasheet, PDF (1/16 Pages) Semtech Corporation – High Speed, Combi-SenseTM, Synchronous Power MOSFET Driver for Mobile Applications

POWER MANAGEMENT
Description
SC420A
High Speed, Combi-Sense^TM, Synchronous
Power MOSFET Driver for Mobile Applications
Features
The SC420A is a cost effective Dual MOSFET Driver, in-
corporating Semtech’s patented Combi-Sense^TM technol-
ogy, designed for switching High and Low side Power
MPOOSWFEETRs inMSAteNp-AdoGwEnMSwEiNtcThing regulators. A 30ns max
propagation delay from input transition to the gate of
the power FET’s guarantees operation at high switching
frequencies. Internal overlap protection circuit prevents
shoot-through from Vin to GND in the main and synchro-
nous MOSFETs.
High current drive capability allows fast switching, thus
reducing switching losses at high frequencies without
causing thermal stress on the driver.
The high voltage CMOS process allows operation up to
27 Volts, making the SC420A suitable for adaptor pow-
ered applications. Under-voltage-lockout and over-tem-
perature shutdown features are included for proper and
safe operation. The SC420A is offered in a space saving
MLP-12 package.
u High efficiency
u Shutdown mode for increased power saving
u Fast rise and fall times (10ns typical with 3000pF
load)
u 5V gate drive
u Ultra-low (<30ns) propagation delay (BG going low)
u Adaptive and programmable non-overlapping gate
drives provide shoot-through protection
u Floating top drive switches up to 27V
u High frequency operation allows use of small
inductors and low cost ceramic capacitors
u Under-voltage lockout
u Low quiescent current
u MLP packaging provides superior thermal perfor-
mance in a small footprint
Applications
u High efficiency portable and notebook computers
u Battery powered applications
Conceptual Application Circuit
VIN2
VIN
VIN
PWM
FB ^{Combi-Sense TM}
Controller IC
EN
GND CS- CS+
D1
VIN2
VIN
TG
CO
BST
SC420A
EN
DRN
CDELAY
BG
VPN
CDELAY
RVPN
CVPN
M1
CBST
L1
VOUT
CL
M2
Revision: April 1, 2004
Figure 1
1
United States Patent No. 6,441,597
www.semtech.com