TPS54418_17 Datasheet, PDF (1/42 Pages) Texas Instruments – 2.95-V to 6-V Input, 4-A Output, 2-MHz , Synchronous Step-Down Switcher With Integrated FETs (SWIFT)

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS54418
SLVS946D – SEPTEMBER 2009 – REVISED DECEMBER 2014
TPS54418 2.95-V to 6-V Input, 4-A Output, 2-MHz , Synchronous Step-Down
Switcher With Integrated FETs (SWIFT™)
1 Features
•1 Two, 30-mΩ (typical) MOSFETs for High-
Efficiency at 4-A loads
• Switching Frequency: 200 kHz to 2 MHz
• Voltage Reference Over Temperature: 0.8 V ± 1%
• Synchronizes to External Clock
• Adjustable Soft-start/Sequencing
• UV and OV Power Good Output
• Low Operating and Shutdown Quiescent Current
• Safe Start-up into Pre-Biased Output
• Cycle-by-Cycle Current Limit, Thermal and
Frequency Fold Back Protection
• Operating Junction Temperature Range: –40°C to
150°C
• Thermally Enhanced 3 mm × 3 mm 16-pin WQFN
Package
2 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
3 Description
TheTPS54418 device is a full featured 6-V, 4-A,
synchronous, step-down, current mode converter with
two integrated MOSFETs.
The TPS54418 device 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 device
footprint with a small, 3 mm x 3 mm, thermally
enhanced, QFN package.
The TPS54418 device provides accurate regulation
for a variety of loads with an accurate ±1% voltage
reference (V_REF) over temperature.
Efficiency is maximized through the integrated 30-mΩ
MOSFETs and a 350-μA typical supply current. Using
the enable pin, shutdown supply current is reduced to
2 μA by entering a shutdown mode.
Undervoltage 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 soft-start pin.
An open-drain power good signal indicates the output
is within 93% to 107% of its nominal voltage.
Frequency fold back and thermal shutdown protects
the device during an overcurrent condition.
Use SwitcherPro™ power supply design software to
create, manage and share custom power supply
designs for the TPS54418 by clicking here.
For more SWIFT™ documentation, see the TI
website at www.ti.com/swift.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54418
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
V_IN
TPS54418
VIN
BOOT
EN
PH
PWRGD
VSENSE
SS
RT/CLK
COMP
GND
AGND
PowerPad
1
V_OUT
Efficiency vs Output Current
100
95
90
85
80
75
70
65
60
V_IN = 5 V
55
V_OUT = 1.8 V
50
f_SW = 500 kHz
0
0.5 1
1.5
2 2.5
3
3.5 4
Output Current (A)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.