TPS54620_15 Datasheet, PDF (1/41 Pages) Texas Instruments – TPS54620 4.5-V to 17-V Input, 6-A Synchronous Step Down SWIFT™ Converter

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TPS54620
SLVS949D – MAY 2009 – REVISED OCTOBER 2014
TPS54620 4.5-V to 17-V Input, 6-A Synchronous Step Down SWIFT™ Converter
1 Features
•1 Integrated 26 mΩ / 19 mΩ MOSFETs
• Split Power Rail: 1.6 V to 17 V on PVIN
• 200kHz to 1.6 MHz Switching Frequency
• Synchronizes to External Clock
• 0.8V ±1% Voltage Reference Over Temperature
• Low 2 µA Shutdown Quiescent Current
• Monotonic Start-Up into Pre-biased Outputs
• –40°C to 150°C Operating Junction Temperature
Range
• Adjustable Slow Start/Power Sequencing
• Power Good Output Monitor for Undervoltage and
Overvoltage
• Adjustable Input Undervoltage Lockout
• Supported by SwitcherPro™ Software Tool
• For SWIFT™ Documentation and SwitcherPro™,
visit http://www.ti.com/swift
2 Applications
• High Density Distributed Power Systems
• High Performance Point of Load Regulation
• Broadband, Networking and Optical
Communications Infrastructure
3 Description
The TPS54620 in thermally enhanced 3.50 mm x
3.50 mm QFN package is a full featured 17 V, 6-A
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54620
VQFN (14)
3.50 mm x 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
VIN
Cin
Css Rrt C2
PVIN
VIN
TPS54620
BOOT
Cboot
Lo
EN
PH
Co
PWRGD
SS/TR ^VSENSE
RT/CLK
COMP GND
R3
Exposed
Thermal
C1
Pad
VOUT
R1
R2
Efficiency vs Load Current
100
8V
95
90
85
12 V
17 V
80
75
70
65
60
55
50
0
1
VOUT = 3.3 V
Fsw = 480 kHz
2
3
4
5
6
Load Current - A
1
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.