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TPS54680 Datasheet Preview

TPS54680 Datasheet

6-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER

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Typical Size
6,4 mm X 9,7 mm
www.ti.com
TPS54680
SLVS429B OCTOBER 2002 REVISED OCTOBER 2005
3-V TO 6-V INPUT, 6-A OUTPUT TRACKING SYNCHRONOUS BUCK
PWM SWITCHER WITH INTEGRATED FETs (SWIFT) FOR SEQUENCING
FEATURES
D Power Up/Down Tracking For Sequencing
D 30-m, 12-A Peak MOSFET Switches for High
Efficiency at 6-A Continuous Output Source
or Sink Current
D Wide PWM Frequency:
Fixed 350 kHz or Adjustable 280 kHz to
700 kHz
D Power Good and Enable
D Load Protected by Peak Current Limit and
Thermal Shutdown
D Integrated Solution Reduces Board Area and
Component Count
APPLICATIONS
D Low-Voltage, High-Density Distributed Power
Systems
D Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors Requiring Sequencing
D Broadband, Networking and Optical
Communications Infrastructure
SIMPLIFIED SCHEMATIC
DESCRIPTION
As a member of the SWIFTfamily of dc/dc regulators,
the TPS54680 low-input voltage high-output current
synchronous buck PWM converter integrates all
required active components. Using the TRACKIN pin
with other regulators, simultaneous power up and down
are easily implemented. Included on the substrate with
the listed features are a true, high performance, voltage
error amplifier that enables maximum performance and
flexibility in choosing the output filter L and C
components; an under-voltage-lockout circuit to
prevent start-up until the input voltage reaches 3 V; an
internally or externally set slow-start circuit to limit
inrush currents; and a power good output useful for
processor/logic reset.
The TPS54680 is available in a thermally enhanced
28-pin TSSOP (PWP) PowerPADpackage, which
eliminates bulky heatsinks. TI provides evaluation
modules and the SWIFTdesigner software tool to aid
in quickly achieving high-performance power supply
designs to meet aggressive equipment development
cycles.
Input
I/O Supply
VIN PH
TPS54680
BOOT
TRACKIN PGND
VBIAS VSENSE
AGND COMP
Core Supply
STARTUP TIMING
VI = 5 V
fs = 700 kHz
I/O
CORE
PWRGD(I/O)
PWRGD(CORE)
t Time 500 µs/div
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.
PowerPAD and SWIFT are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright © 2002 2005, Texas Instruments Incorporated




etcTI

TPS54680 Datasheet Preview

TPS54680 Datasheet

6-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER

No Preview Available !

TPS54680
SLVS429B OCTOBER 2002 REVISED OCTOBER 2005
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during
storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
TA
40°C to 85°C
OUTPUT VOLTAGE
0.9 V to 3.3 V
PACKAGE
Plastic HTSSOP (PWP)(1)(2)
PART NUMBER
TPS54680PWP
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
(2) The PWP package is also available taped and reeled. Add an R suffix to the device type (i.e., TPS54680PWPR). See the application section of
the data sheet for PowerPAD drawing and layout information.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
TPS54680
UNIT
VIN, ENA
0.3 V to 7 V
Input voltage range, VI
RT
VSENSE, TRACKIN
0.3 V to 6 V
0.3 V to 4V
V
BOOT
0.3 V to 17 V
Output voltage range, VO
VBIAS, COMP, PWRGD
PH
0.3 V to 7 V
0.6 V to 10 V
V
Source current, IO
PH
COMP, VBIAS
Internally Limited
6 mA
PH 12 A
Sink current, IS
COMP
ENA, PWRGD
6
10 mA
Voltage differential
AGND to PGND
±0.3 V
Operating virtual junction temperature range, TJ
40 to 125
°C
Storage temperature, Tstg
65 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300 °C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Input voltage, VI
Operating junction temperature, TJ
MIN
3
40
NOM
MAX
6
125
UNIT
V
°C
DISSIPATION RATINGS(1)(2)
PACKAGE
THERMAL IMPEDANCE
JUNCTION-TO-AMBIENT
TA = 25°C
TA = 70°C
POWER RATING POWER RATING
28 Pin PWP with solder
18.2 °C/W
5.49 W(3)
28 Pin PWP without solder
40.5 °C/W
2.48 W
(1) For more information on the PWP package, refer to TI technical brief, literature number SLMA002.
(2) Test board conditions:
1. 3” x 3”, 4 layers, thickness: 0.062”
2. 1.5 oz. copper traces located on the top of the PCB
3. 1.5 oz. copper ground plane on the bottom of the PCB
4. 0.5 oz. copper ground planes on the 2 internal layers
5. 12 thermal vias (see “Recommended Land Pattern” in applications section of this data sheet)
(3) Maximum power dissipation may be limited by over current protection.
3.02 W
1.36 W
TA = 85°C
POWER RATING
2.20 W
0.99 W
2


Part Number TPS54680
Description 6-A OUTPUT TRACKING SYNCHRONOUS BUCK PWM SWITCHER
Maker etcTI
Total Page 26 Pages
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