SC1405B Ver la hoja de datos (PDF) - Semtech Corporation
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SC1405B Datasheet PDF : 12 Pages
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HIGH SPEED SYNCHRONOUS POWER
MOSFET SMART DRIVER
SC1405B
March 14, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1405B is a Dual-MOSFET Driver with an inter-
nal Overlap Protection Circuit to prevent shoot-through
from VIN to GND in the main switching and syn-
chronous MOSFET’s. Each driver is capable of driving
a 3000pF load in 15ns rise/fall time and has ULTRA-
FAST propagation delay from input transition to the
gate of the power FET’s. The Overlap Protection circuit
ensures that the second FET does not turn on until the
top FET source has reached a voltage low enough to
prevent shoot-through. The delay between the bottom
gate going low to the top gate transitioning to high is
externally programmable via a capacitor for optimal
reduction of switching losses at the operating fre-
quency. The bottom FET may be disabled at light loads
by keeping S_MOD low to trigger asynchronous opera-
tion, thus saving the bottom FET’s gate drive current
and inductor ripple current. An internal voltage refer-
ence allows threshold adjustment for an Output Over-
Voltage protection circuitry, independent of the PWM
feedback loop. Under-Voltage-Lock-Out circuit is in-
cluded to guarantee 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). A
CMOS output provides status indication of the 5V sup-
ply. A low enable input places the IC in stand-by mode
thereby reducing supply current to less than 10µA.
SC1405B is offered in a high pitch (.025” lead spacing)
TSSOP package.
PIN CONFIGURATION
FEATURES
• Fast rise and fall times (15ns with 3000pf load)
• 14ns max. Propagation delay (BG going low)
• Adaptive/programmable shoot-through protection
• Wide input voltage range (4.5-25V)
• Programmable delay between MOSFET’s
• Power saving asynchronous mode control
• Output overvoltage protection/overtemp shutdown
• Under-Voltage lock-out and power ready signal
• Less than 10µA stand-by current (EN=low)
• Power ready output signal
• Improved drive version of SC1405TS
• High frequency (to 1.2MHz) operation allows use
of small inductors and low cost caps in place of
electrolytics
APPLICATIONS
• High Density/Fast transient power supplies
• Motor Drives/Class-D amps
• Portable computers
ORDERING INFORMATION
DEVICE(1)
SC1405B
PACKAGE
TSSOP-14
TEMP. RANGE (TJ)
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
BLOCK DIAGRAM
Top View
(14-Pin TSSOP)
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
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