TPS40007
TPS40009
SLUS589B− NOVEMBER 2003 − REVISED FEBRUARY 2005
LOW INPUT HIGH EFFICIENCY
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
D
D
D
D
D
D
Drivers for Higher Efficiency
Externally Adjustable Soft-Start and
Overcurrent Limit
Fixed-Frequency Voltage-Mode Control
− TPS40007, 300 kHz
− TPS40009, 600 kHz
Source/Sink with V
OUT
Prebias
10-Lead MSOP PowerPadt Package for
Higher Performance
Thermal Shutdown
Internal Boostrap Diode
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.
SIMPLIFIED APPLICATION DIAGRAM
VIN
TPS40007
TPS40009
1
2
3
4
ILIM
FB
COMP
SW
SS/SD
VDD
5
GND
LDRV
7
6
8
BOOT 10
HDRV
9
VOUT
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
1
TI [ TEXAS INSTRUMENTS ]
