TPS84320 Datasheet, PDF (1/31 Pages) Texas Instruments – 4.5-V to 14.5-V Input, 3-A Synchronous Buck, Integrated Power Solution

TPS84320
www.ti.com
SLUSAH7 – SEPTEMBER 2011
4.5-V to 14.5-V Input, 3-A Synchronous Buck, Integrated Power Solution
Check for Samples: TPS84320
FEATURES
1
•2 Complete Integrated Power Solution Allows
Small Footprint, Low-Profile Design
• Efficiencies Up To 95%
• Wide-Output Voltage Adjust
0.8 V to 5.5 V, with 1% Reference Accuracy
• Optional Split Power Rail Allows
Input Voltage Down to 1.6 V
• Adjustable Switching Frequency
(330 kHz to 780 kHz)
• Synchronizes to an External Clock
• Adjustable Slow-Start
• Output Voltage Sequencing / Tracking
• Power Good Output
• Programmable Undervoltage Lockout (UVLO)
• Overcurrent Protection - Hiccup-Mode
• Over Temperature Protection
• Pre-bias Output Start-up
• Operating Temperature Range: –40°C to 85°C
• Enhanced Thermal Performance: 13°C/W
• Meets EN55022 Class B Emissions
• For Design Help Including SwitcherPro™ visit
http://www.ti.com/TPS84320
APPLICATIONS
• Broadband & Communications Infrastructure
• Automated Test and Medical Equipment
• Compact PCI / PCI Express / PXI Express
• DSP and FPGA Point of Load Applications
• High Density Distributed Power Systems
DESCRIPTION
The TPS84320RUQ is an easy-to-use integrated
power solution that combines a 3-A DC/DC converter
with power MOSFETs, an inductor, and passives into
a low profile, BQFN package. This total power
solution allows as few as 3 external components and
eliminates the loop compensation and magnetics
design process.
The 9×15×2.8 mm BQFN package is easy to solder
onto a printed circuit board and allows a compact
point-of-load design with up to 95% efficiency and
excellent power dissipation with a thermal impedance
of 13°C/W junction to ambient. The device delivers
the full 3-A rated output current at 85°C ambient
temperature without airflow.
The TPS84320 offers the flexibility and the
feature-set of a discrete point-of-load design and is
ideal for powering performance DSPs and FPGAs.
Advanced packaging technology afford a robust and
reliable power solution compatible with standard QFN
mounting and testing techniques.
SIMPLIFIED APPLICATION
PVIN
V_IN
PWRGD
VIN
C_IN
TPS84320
VOUT
RT/CLK
SENSE+
INH/UVLO
SS/TR
VADJ
V_OUT
C_OUT
100
95
90
85
80
75
70
65
60
55
50
45
40
0
V_IN = PV_IN = 5 V, V_OUT = 3.3V, f_SW = 630 kHz
V_IN = PV_IN = 12 V, V_OUT = 3.3V, f_SW = 630 kHz
0.5
1
1.5
2
2.5
3
Output Current (A)
G000
STSEL
PGND
AGND
R_SET
UDG-10082
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.
SwitcherPro is a trademark 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, Texas Instruments Incorporated