TPS54319
www.ti.com
SLVSA83 –JUNE 2010
2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down
Switcher With Integrated FETs ( SWIFT™)
Check for Samples: TPS54319
1
FEATURES
DESCRIPTION
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•
Two 45-mΩ (typical) MOSFETs for High
The TPS54319 device is a full featured 6 V, 3 A,
synchronous step down current mode converter with
two integrated MOSFETs.
Efficiency at 3-A Loads
•
•
300kHz to 2MHz Switching Frequency
0.8 V ± 3.0% Voltage Reference Over
Temperature (0°C to 85°C)
The TPS54319 enables small designs by integrating
the MOSFETs, implementing current mode control to
reduce external component count, reducing inductor
size by enabling up to 2 MHz switching frequency,
and minimizing the IC footprint with a small 3mm x
3mm thermally enhanced QFN package.
•
•
•
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Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
–40°C to 150°C Operating Junction
Temperature Range
The TPS54319 provides accurate regulation for a
variety of loads with an accurate ±3.0% Voltage
Reference (VREF) over temperature.
•
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Thermally Enhanced 3mm × 3mm 16-pin QFN
Pin Compatible to TPS54318
Efficiency is maximized through the integrated 45mΩ
MOSFETs and 360mA typical supply current. Using
the enable pin, shutdown supply current is reduced to
2 µA by entering a shutdown mode.
APPLICATIONS
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Low-Voltage, High-Density Power Systems
•
Point-of-Load Regulation for Consumer
Applications such as Set Top Boxes, LCD
Displays, CPE Equipment
Under voltage lockout is internally set at 2.6 V, but
can be increased by programming the threshold with
a resistor network on the enable pin. The output
voltage startup ramp is controlled by the slow start
pin. An open drain power good signal indicates the
output is within 93% to 107% of its nominal voltage.
SIMPLIFIED SCHEMATIC
vertical spacer
Frequency fold back and thermal shutdown protects
the device during an over-current condition.
vertical spacer
VIN
C
The TPS54319 is supported in the SwitcherPro™
Software Tool at www.ti.com/switcherpro.
For more SWIFTTM documentation, see the TI
website at www.ti.com/swift.
BOOT
VIN
BOOT
TPS54319
C
I
L
O
VOUT
EN
PH
C
O
R
1
2
100
PWRGD
3.3 Vin,1.8 Vout
90
VSENSE
R
SS/TR
RT /CLK
COMP
80
5 Vin, 1.8 Vout
70
60
50
40
30
20
GND
AGND
C
POWERPAD
ss
R
R
T
3
C
1
10
0
0
0.5
1
1.5
2
2.5
3
Output Current - A
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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SWIFT, SwitcherPro are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated