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TPS40001 Datasheet

  • TPS40001

  • 低輸入電壓模式同步降壓控制器

  • 25頁

  • TI

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TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507C 鈭?JANUARY 2002 鈭?REVISED JUNE 2004
LOW INPUT VOLTAGE MODE
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
D
Drivers for Higher Efficiency
Externally Adjustable Soft-Start and
Overcurrent Limit
Source-Only Current or Source/Sink Current
Versions for Starting Into V
OUT
Pre-Bias
10-Lead MSOP PowerPadt Package for
Higher Performance
Thermal Shutdown
Internal Boostrap Diode
Fixed-Frequency, Voltage-Mode Control
鈭?TPS40000/1/4 300-kHz
鈭?TPS40002/3/5 600-kHz
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鈥檚
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
TPS40000
1
2
3
4
ILIM
FB
COMP
SW
SS/SD
VDD
5
GND
LDRV
7
6
8
BOOT 10
HDRV
9
VOUT
UDG鈭?1141
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
錚?/div>
2002, Texas Instruments Incorporated
www.ti.com
1

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