TPS54678_17 Datasheet, PDF (1/42 Pages) Texas Instruments – 2.95-V to 6-V Input, 6-A Output, 2-MHz, Synchronous Step-Down SWIFT Switcher

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
TPS54678
SLVSBF3A – JUNE 2012 – REVISED NOVEMBER 2015
2.95-V to 6-V Input, 6-A Output, 2-MHz, Synchronous Step-Down
SWIFT^™ Switcher
1 Features
•1 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 Prebiased 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 × 3-mm WQFN
(RTE)
2 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
3 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 ×
3-mm thermally enhanced WQFN 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 start-up ramp is controlled by the
soft-start pin that can also be configured for
sequencing or tracking. Monotonic start-up is
achieved with prebiased voltage. Undervoltage
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54678
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
V_IN
TPS54678
VIN
BOOT
EN
PH
V_OUT
PWRGD
VSENSE
SS
RT/CLK
COMP
GND
AGND
Exposed thermal pad
Efficiency vs Output Current
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
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.