TPS54418
www.ti.com
SLVS946A –MAY 2009–REVISED MAY 2010
2.95 V to 6 V Input, 4 A Output, 2MHz, Synchronous Step Down
Switcher With Integrated FETs ( SWIFT™)
1
FEATURES
DESCRIPTION
2
•
Two 30 mΩ (typical) MOSFETs for high
efficiency at 4 A loads
The TPS54418 device is a full featured 6 V, 4 A,
synchronous step down current mode converter with
two integrated MOSFETs.
•
•
200kHz to 2MHz Switching Frequency
0.8 V ± 1% Voltage Reference Over
Temperature
The TPS54418 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.
•
•
•
•
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
Low Operating and Shutdown Quiescent
Current
The TPS54418 provides accurate regulation for a
variety of loads with an accurate ±1% Voltage
Reference (VREF) over temperature.
•
•
Safe Start-up into Pre-Biased Output
Cycle by Cycle Current Limit, Thermal and
Frequency Fold Back Protection
Efficiency is maximized through the integrated 30mΩ
MOSFETs and 350mA typical supply current. Using
the enable pin, shutdown supply current is reduced to
2 mA by entering a shutdown mode.
•
•
–40°C to 150°C Operating Junction
Temperature Range
Thermally Enhanced 3mm × 3mm 16-pin QFN
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.
APPLICATIONS
•
•
Low-Voltage, High-Density Power Systems
Point of Load Regulation for High Performance
DSPs, FPGAs, ASICs and Microprocessors
Broadband, Networking and Optical
Communications Infrastructure
•
Frequency fold back and thermal shutdown protects
the device during an overcurrent condition.
The TPS54418 is supported in the SwitcherProTM
Software Tool at www.ti.com/switcherpro.
For more SWIFTTM documentation, see the TI
website at www.ti.com/swift.
SIMPLIFIED SCHEMATIC
VIN
C
BOOT
VIN
BOOT
TPS54418
R4
R5
C
I
L
O
VOUT
100
EN
PH
C
O
95
90
85
R
1
PWRGD
VSENSE
80
75
70
SS
RT /CLK
COMP
GND
V
V
= 5 V,
R
2
AGND
IN
O
65
60
= 1.8 V,
C
POWERPAD
ss
fsw = 500 kHz
R
R
T
3
55
50
C
1
0
0.5
1
1.5
2
2.5
3
3.5
4
Load Current - A
1
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.
2
SWIFT is a trademark 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 © 2009–2010, Texas Instruments Incorporated
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