TPS40007DGQRG4 Datasheet, PDF (1/28 Pages) Texas Instruments – LOW-INPUT HIGH-EFFICIENCY SYNCHRNOUS BUCK CONTROLLER

TPS40007
TPS40009
SLUS589B− NOVEMBER 2003 − REVISED FEBRUARY 2005
LOWĆINPUT HIGHĆEFFICIENCY
SYNCHRONOUS BUCK CONTROLLER
FEATURES
D Operating Input Voltage 2.25 V to 5.5 V
D Output Voltage as Low as 0.7 V
D 1% Internal 0.7 V Reference
D Predictive Gate Drivet N-Channel MOSFET
Drivers for Higher Efficiency
D Externally Adjustable Soft-Start and
Overcurrent Limit
D Fixed-Frequency Voltage-Mode Control
− TPS40007, 300 kHz
− TPS40009, 600 kHz
D Source/Sink with V_OUT Prebias
D 10-Lead MSOP PowerPadt Package for
Higher Performance
D Thermal Shutdown
D Internal Boostrap Diode
SIMPLIFIED APPLICATION DIAGRAM
APPLICATIONS
D Networking Equipment
D Telecom Equipment
D Base Stations
D Servers
D DSP Power
D Power Modules
DESCRIPTION
The TPS4000x are controllers for low-voltage,
non-isolated synchronous buck regulators. These
controllers drive an N-channel MOSFET for the
primary buck switch, and an N-channel MOSFET
for the synchronous rectifier switch, thereby
achieving very high-efficiency power conversion. In
addition, the device controls the delays from main
switch off to rectifier turn-on and from rectifier
turn-off to main switch turn-on in such a way as to
minimize diode losses (both conduction and
recovery) in the synchronous rectifier with TI’s
proprietary Predictive Gate Drivet technology. The
reduction in these losses is significant and increases
efficiency. For a given converter power level, smaller
FETs can be used, or heat sinking can be reduced
or even eliminated.
VIN
TPS40007
TPS40009
1 ILIM
BOOT 10
2 FB
HDRV 9
3 COMP
4 SS/SD
SW 8
VDD 7
VOUT
5 GND
LDRV 6
UDG−03161
PowerPADt and Predictive Gate Drivet are trademarks of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  2003, 2004 Texas Instruments Incorporated
www.ti.com
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