SC420 Datasheet, PDF (1/12 Pages) Semtech Corporation – High Speed, Combi-SenseTM, Synchronous Power MOSFET Driver for Mobile Applications

POWER MANAGEMENT
SC420
High Speed, Combi-Sense^TM, Synchronous
Power MOSFET Driver for Mobile Applications
TARGET
POWER MANAGEMENT
Description
Features
The SC420 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
MOSFETs in Step-down Switching regulators. A 20ns 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 (2A peak) allows fast
switching, thus reducing switching losses at high (up to
1.5MHz) frequencies without causing thermal stress on
the driver.
The high voltage CMOS process allows operation up to
27 Volts, making the SC420 suitable for adaptor pow-
ered applications. Under-voltage-lockout and over-tem-
perature shutdown features are included for proper and
safe operation. The SC420 is offered in a space saving
MLP-12 package.
u High efficiency
u Shutdown mode for increased power saving
u Tri-state capability
u Fast rise and fall times (15ns typical with 3000pF
load)
u 5V gate drive
u Ultra-low (<20ns) 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 (to 1.5 MHz) 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
Conceptual Application Circuit
Applications
u High efficiency portable and notebook computers
u Battery powered applications
VIN2
VIN
VIN
Combi-Sense^TM PWM
FB ^{Controller IC}
EN
GND CS- CS+
D1
VIN2
VIN
TG
CO
BST
SC420
EN
DRN
CDELAY
BG
VPN
CDELAY
RVPN
CVPN
M1
CBST
L1
M2
VOUT
CL
Rev 4. December 2003
Figure 1
1
United States Patent No. 6,441,597
www.semtech.com