SC1211_03

Manufacturer Part NumberSC1211_03
DescriptionHigh Speed, Combi-SenseTM Synchronous MOSFET Driver
ManufacturerSEMTECH [Semtech Corporation]
SC1211_03 datasheet
 


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POWER MANAGEMENT
Description
The SC1211 is a high speed, Combi-Sense
put driver designed to drive high-side and low-side
MOSFETs in a synchronous Buck converter. These
drivers combined with Combi-Sense PWM controllers,
such as Semtech SC2643VX or SC2643, provide a
cost effective multi-phase voltage regulator for advanced
microprocessors.
The Combi-Sense
TM
is a technique to sense the inductor
current for peak current mode control of voltage regula-
tor without using sensing resistor. It provides the follow-
ing advantages:
- No costly precision sensing resistor
- Lossless current sensing
- High level noise free signal
- Fast response
- Suitable for wide range of duty cycle
- Only two small signal components (third optional)
The detailed explanation of the technique can be found
in the Applications Information section.
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 and safe operation.
Timed latches and improved robustness are built into
the housekeeping functions such as the Under Voltage
Lockout and adaptive Shoot-through protection circuitry
to prevent false triggering and to assure safe operation.
The SC1211 is offered in a Power SOIC-8L package.
October 12, 2003
Synchronous MOSFET Driver
Features
u
, dual out-
High efficiency
TM
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
Support
Combi-Sense
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
®
u
AMD Athlon
TM
supplies
u
High current low voltage DC-DC converter
1
High Speed, Combi-Sense
and VID-on-fly operations
TM
processor power supplies
processor power
and AMD-K8
TM
s
www.semtech.com
TM