TPS54020 Datasheet, PDF (1/4 Pages) Texas Instruments – 4.5V to 17V Input, 10A Synchronous Step-Down SWIFT™ Converter With Full Feature Set

TPS54020
www.ti.com
SLVSB10 – JULY 2012
4.5V to 17V Input, 10A Synchronous Step-Down SWIFT™ Converter With Full Feature Set
Check for Samples: TPS54020
FEATURES
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•2 Integrated 8mΩ/7mΩ MOSFETs
• Split Power Rail: 1.6V to 17V on PVIN
• 0.6V Voltage Reference With ±1% Accuracy
• Peak Current Mode Control
• 200kHz to 1.2MHz Switching Frequency
• Synchronizes to External Clock
• Low 2µA Shutdown Quiescent Current
• Monotonic Start-Up into Pre-biased Outputs
• Programmable Current Limit Thresholds
• Overcurrent Protection for Both MOSFETs
with Selectable Overcurrent Protection
Schemes
• Thermal and Overvoltage Transient Protection
• –40°C to 150°C Operating Junction
Temperature Range
• Adjustable Slow Start/Power Sequencing
• Power Good Output Monitor for Undervoltage
and Overvoltage
• SYNC_OUT Function Provides Output Clock
Signal 180° Out of Phase for Parallel Operation
• Supported by WEBENCH™ Software Tool
• For SWIFT™ Documentation and WEBENCH™,
visit http://www.ti.com/swift
• Thermally Enhanced 3.5 × 3.5 mm HoTRoD™
Package
APPLICATIONS
• High-Density Distributed Power Systems
• High Performance Point of Load Regulation
• Broadband, Networking and Optical
Communications Infrastructure
DESCRIPTION
The TPS54020 in thermally enhanced 3.5mm x
3.5mm HotRod™ package is a full featured 17V, 10A
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
supply 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
MOSFET protects the TPS54020 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. The corresponding current limit thresholds
are also programmable to fit various applications. To
protect the device further, hiccup protection or cycle
by cycle overcurrent protection can be chosen.
Thermal shutdown hiccup protection disables the part
when die temperature exceeds thermal shutdown trip
point and enables the part again after the built-in
thermal shutdown hiccup time.
Two TPS54020 devices may operate in parallel with
180° out of phase synchronization by using the
SYNC_OUT pin.
SIMPLIFIED SCHEMATIC
PWRGD
VIN
SYNC _OUT PVIN
TPS54020
INPUT
PVIN: 4.5 V to 17 V
VIN: 1.6 V to 17 V
C1
10 mF/25 V
EN
BOOT
Cb
0.1 mF
Lo
1 mH
OUTPUT
1 V/10 A
ILIM
PH
SS /TR
HICCUP
Co
100 mF/6.3 V
R8
10 kW
C7
0.01 mF
R3
100 kW
R4
2.1 kW
C4
3.9 nF
RT /CLK
COMP
RTN
VSENSE
PGND
NOTE: RTN should not be connected to PGND
R9
40 kW
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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, WEBENCH, HoTRoD are trademarks of Texas Instruments.
2
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2012, Texas Instruments Incorporated