TPS54519_15 Datasheet, PDF (1/38 Pages) Texas Instruments – 2.95 V to 6 V Input, 5-A Synchronous Step Down SWIFT™ Converter

TPS54519
www.ti.com
SLVSAT3A – SEPTEMBER 2011 – REVISED DECEMBER 2013
2.95 V to 6 V Input, 5-A Synchronous Step Down SWIFT™ Converter
FEATURES
1
•2 Two 30 mΩ (typical) MOSFETs for high
efficiency at 5-A loads
• 200kHz to 2MHz Switching Frequency
• 0.6 V Voltage Reference With ± 1% Initial
Accuracy
• 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 140°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
VIN
C_BOOT
BOOT
R4
TPS54519
LO
EN
PH
R5
CO
C _ss
RT
PWRGD
VSENSE
SS/TR
RT
COMP
GND
AGND
POWERPAD
R3
C1
VOUT
R1
R2
DESCRIPTION
The TPS54519 device is a full featured 6 V, 5 A,
synchronous step down current mode converter with
two integrated MOSFETs.
The TPS54519 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.
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.
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.
Frequency fold back and thermal shutdown protects
the device during an overcurrent condition.
The TPS54519 is supported in the SwitcherPro™
Software Tool at www.ti.com/switcherpro.
For more SWIFT™ documentation, see the TI
website at www.ti.com/swift.
100
V_IN = 5 V
90
80
V_IN = 3 V
70
60
V_OUT = 1.2 V
F_SW = 1MHz
50
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
I_L - 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.
SWIFT, SwitcherPro are trademarks 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 © 2011–2013, Texas Instruments Incorporated