TPS54218_12 Datasheet, PDF (1/37 Pages) Texas Instruments – 2.95 V to 6 V Input, 2 A Output, 2MHz, Synchronous Step Down

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TPS54218
SLVS974A – SEPTEMBER 2009 – REVISED AUGUST 2012
2.95 V to 6 V Input, 2 A Output, 2MHz, Synchronous Step Down
Switcher With Integrated FETs ( SWIFT™)
Check for Samples: TPS54218
FEATURES
1
•2 Two 30 mΩ (typical) MOSFETs for High
Efficiency at 2 A loads
• 200kHz to 2MHz Switching Frequency
• 0.8 V ± 1% Voltage Reference Over
Temperature
• Synchronizes to External Clock
• Adjustable Slow 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
• –40°C to 150°C Operating Junction
Temperature Range
• Thermally Enhanced 3mm × 3mm 16-pin QFN
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
SIMPLIFIED SCHEMATIC
VIN
CI
C ss
RT
VIN
C_BOOT
BOOT
R4
TPS54218
LO
EN
PH
R5
CO
PWRGD
VSENSE
SS
RT /CLK
COMP
GND
AGND
POWERPAD
R3
C1
VOUT
R1
R2
DESCRIPTION
The TPS54218 device is a full featured 6 V, 2 A,
synchronous step down current mode converter with
two integrated MOSFETs.
The TPS54218 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.
The TPS54218 provides accurate regulation for a
variety of loads with an accurate ±1% Voltage
Reference (V_ref) over temperature.
Efficiency is maximized through the integrated 30mΩ
MOSFETs and 350μA 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 slow 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.
The TPS54218 is supported in the SwitcherPro^TM
Software Tool at www.ti.com/switcherpro.
For more SWIFT^TM documentation, see the TI
website at www.ti.com/swift.
100
95
90
85
80
75
70
65
60
55
50
0
V_I = 5 V,
V_O = 1.8 V,
F_S = 1000 kHz
0.25 0.5 0.75 1 1.25 1.5 1.75 2
I_O - Output 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.
SWIFT is a trademark of Texas Instruments.
2
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 © 2009–2012, Texas Instruments Incorporated