SC1210 Datasheet, PDF (1/9 Pages) Semtech Corporation – High Speed, 12 V, Synchronous Power MOSFET Driver

POWER MANAGEMENT
Description
The SC1210 is a high speed, dual output driver designed
to drive high-side and low-side MOSFETs in a synchro-
nous Buck converter. These drivers can work with many
Semtech PWM controllers to provide a cost effective
multi-phase voltage regulator for advanced micropro-
cessors.
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 PGND in the main
and synchronous MOSFETs. The adaptive overlap pro-
tection circuit ensures the bottom FET does not turn on
until the top FET source has reached 1V, to prevent cross-
conduction.
8.5V gate drive provides optimum enhancement of
MOSFETs at minimum driver and MOSFET switching loss.
High current drive capability allows fast switching, thus
reducing switching losses at high (up to 1.5MHz) frequen-
cies without causing thermal stress on the driver.
Under-voltage-lockout and over-temperature shutdown
features are included for proper protection and safe op-
eration. Timed latches and improved robustness are built
into the safty functions such as the Under Voltage Lock-
out and adaptive Shoot-through protection circuitry to
prevent false triggering. The SC1210 is offered in a stan-
dard SO-8 package.
SC1210
High Speed, 12 V, Synchronous
Power MOSFET Driver
Features
u High efficiency
u +12V supply voltage with internal LDO for optimum
gate drive
u High peak drive current
u Adaptive non-overlapping gate drives provide
shoot-through protection
u Fast rise and fall times (15ns typical with 3000pf
load)
u Ultra-low (<30ns) propagation delay (BG going low)
u Floating top gate drive
u Crowbar function for over voltage protection
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
Applications
u Intel Pentium^TM processor power supplies
u AMD Athlon^TM and K8^TM processor power supplies
u High current low voltage DC-DC converters
Typical Application Circuit
Vin (+12V)
R3
2R2
Q1
R1
C1
U1
1R0
1uF
1 _DRN
PGND ⁸
2 _TG
BG ⁷
PWM
3 _BST
VREG ⁶
Q2
4 _CO
VIN ⁵
D1
1N4148
SC1210
C3
C2
1uF
1uF
C4
10uF
L1
1
2
R2
1R0
C6
2.2nF
Vout
C5
August 8, 2003
1
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