TPS54678 Datasheet, PDF (1/37 Pages) Texas Instruments – 2.95 V to 6 V INPUT, 6 A OUTPUT, 2 MHz, SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT™)

TPS54678
www.ti.com
SLVSBF3 – JUNE 2012
2.95 V to 6 V INPUT, 6 A OUTPUT, 2 MHz, SYNCHRONOUS STEP DOWN SWITCHER WITH
INTEGRATED FET ( SWIFT™)
Check for Samples: TPS54678
FEATURES
1
•2 Two 12 mΩ (typical) MOSFETs for High
Efficiency 6 A Continuous Output Current
• 200 kHz to 2 MHz Switching Frequency
• 0.6 V ±1% Voltage Reference Over
Temperature (-40°C to 150°C)
• Synchronizes to External Clock
• Start up with Pre-Biased Voltage
• Power Good Output
• Adjustable Slow Start and Sequencing
• Cycle-by-Cycle Current Limit and Hiccup
Current Protection
• Adjustable Input Voltage UVLO
• Thermally Enhanced 16-Pin 3 mm x 3 mm QFN
(RTE)
APPLICATIONS
• Low-Voltage, High-Density Power Systems
• Point of Load Regulation for High Performance
DSPs, FPGAs, ASICs and Microprocessors
• Broadband, Networking and Optical
• Communications Infrastructure
• Gaming, DTV and Set-Top Boxes
DESCRIPTION
TPS54678 device is a full featured 6 V, 6 A,
synchronous step down current mode converter with
two integrated MOSFETs.
TPS54678 enables small designs by integrating the
MOSFETs, implementing current mode control to
reduce external component count, reducing inductor
size by enabling up to 2 MHz switching frequency,
and minimizing the IC footprint with a small 3 mm x 3
mm thermally enhanced QFN package.
TPS54678 provides accurate regulation for a variety
of loads with an accurate ±1% Voltage Reference
(V_REF) over temperature.
Efficiency is maximized through the integrated 12 mΩ
MOSFETs. Using the enable pin, shutdown supply
current is reduced by disabling the device.
The output voltage startup ramp is controlled by the
soft start pin that can also be configured for
sequencing or tracking. Monotonic startup is achieved
with pre-biased voltage. Under voltage lockout can be
increased by programming the threshold with a
resistor divider on the enable pin. An open drain
power good signal indicates the output is within 93%
to 105% of its nominal voltage.
Cycle-by-cycle current limit, hiccup overcurrent
protection and thermal shutdown protect the device
during an overcurrent condition.
VIN
C_I
VIN
TPS54678
EN
BOOT
PH
PWRGD
C_BOOT
L_O
C_O
C_SS
R_T
VSENSE
SS/TR
RT/CLK
COMP
GND
R₃
C₁
VOUT
R₁
R₂
95
94
93
92
91
90
89
88
87
86
85
1
V_IN = 3.3 V
V_IN = 5 V
2
3
4
Current (A)
V_OUT = 1.8 V
Fsw = 500 KHz
DCR = 7.5 mΩ
5
6
G020
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.
SWIFT, PowerPAD are trademarks 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 © 2012, Texas Instruments Incorporated