Datasheet
100
95
90
85
80
75
70
65
60
55
50
Efficiency-%
0 1 2 3 4 5 6
LoadCurrent- A
8V
12V
17V
VOUT =3.3V
Fsw=480kHz
PH
PVIN
GND
BOOT
VSENSE
COMP
TPS54620
EN
RT/CLK
SS/TR
Exposed
Thermal
Pad
Css
Rrt
R3
C1
Cboot
Co
Lo
R1
R
2
Cin
C2
VIN
VIN
VOUT
PWRGD
TPS54620
www.ti.com
SLVS949C –MAY 2009– REVISED MAY 2011
4.5V to 17V Input, 6A Synchronous Step Down SWIFT™ Converter
Check for Samples: TPS54620
1
FEATURES
• Adjustable Input Undervoltage Lockout
• Supported by SwitcherPro™ Software Tool
• Integrated 26mΩ / 19mΩ MOSFETs
• For SWIFT™ Documentation and
• Split Power Rail: 1.6V to 17V on PVIN
SwitcherPro™, visit http://www.ti.com/swift
• 200kHz to 1.6MHz Switching Frequency
• Synchronizes to External Clock
APPLICATIONS
• 0.8V ±1% Voltage Reference Over Temperature
• High Density Distributed Power Systems
• Low 2uA Shutdown Quiescent Current
• High Performance Point of Load Regulation
• Monotonic Start-Up into Pre-biased Outputs
• Broadband, Networking and Optical
• –40°C to 150°C Operating Junction
Communications Infrastructure
Temperature Range
• Adjustable Slow Start/Power Sequencing
• Power Good Output Monitor for Undervoltage
and Overvoltage
DESCRIPTION
The TPS54620 in thermally enhanced 3.5mm x 3.5mm QFN package is a full featured 17V, 6A synchronous step
down converter which is optimized for small designs through high efficiency and integrating the high-side and
low-side MOSFETs. Further space savings are achieved through current mode control, which reduces
component count, and by selecting a high switching frequency, reducing the inductor's footprint.
The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone
power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and
the open drain power good pins.
Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced
by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit
which turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part
when die temperature exceeds thermal shutdown temperature.
WHITE SPACE
SIMPLIFIED SCHEMATIC
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.