TPS54335A Datasheet, PDF (1/53 Pages) Texas Instruments – TPS5433xA 4.5-V to 28-V Input, 3-A Output, Synchronous Step-Down DC-DC Converter

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TPS54335A, TPS54335-1A, TPS54336A
SLVSCD5D – NOVEMBER 2014 – REVISED FEBRUARY 2016
TPS5433xA 4.5-V to 28-V Input, 3-A Output, Synchronous
Step-Down DC-DC Converter
1 Features
•1 Synchronous 128-mΩ and 84-mΩ MOSFETs for
3-A Continuous Output Current
• TPS54335A: Internal 2-ms Soft-Start,
50-kHz to 1.5-MHz Adjustable Frequency
• TPS54336A: Adjustable Soft-Start,
Fixed 340-kHz Frequency
• Low 2-µA Shutdown, Quiescent Current
• 0.8-V Voltage Reference with ±0.8% Accuracy
• Current Mode Control
• Monotonic Startup into Pre-Biased Outputs
• Pulse Skipping for Light-Load Efficiency
• Hiccup Mode Overcurrent Protection
• Thermal Shutdown (TSD) and
Overvoltage Transition Protection
• 8-Pin SO PowerPAD™ and 10-Pin VSON
Package
• Create a Custom Design Using the TPS54335A
with the WEBENCH Power Designer
2 Applications
• Consumer Applications such as a Digital TV
(DTV), Set Top Box (STB, DVD/Blu-ray Player),
LCD Display, CPE (Cable Modem, WiFi Router),
DLP Projectors, Smart Meters
• Battery Chargers
• Industrial and Car Audio Power Supplies
• 5-V, 12-V, and 24-V Distributed Power Bus Supply
3 Description
The TPS5433xA family of devices are synchronous
converters with an input-voltage range of 4.5 V to 28
V. These devices include This device has an
integrated low-side switching FET that eliminates the
need for an external diode which reduces component
count.
Efficiency is maximized through the integrated 128-
mΩ and 84-mΩ MOSFETs, low I_Q and pulse skipping
at light loads. Using the enable pin, the shutdown
supply current is reduced to 2 μA. This step-down
(buck) converter provides accurate regulation for a
variety of loads with a well-regulated voltage
reference that is 1.5% over temperature.
Cycle-by-cycle current limiting on the high-side
MOSFET protects the TPS5433xA family of devices
in overload situations and is enhanced by a low-side
sourcing current limit which prevents current
runaway. A low-side sinking current-limit turns off the
low-side MOSFET to prevent excessive reverse
current. Hiccup protection is triggered if the
overcurrent condition continues for longer than the
preset time. Thermal shutdown disables the device
when the die temperature exceeds the threshold and
enables the device again after the built-in thermal
hiccup time.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54335A
TPS54336A
TPS54335-1A
SO PowerPAD (8)
VSON (10)
VSON (10)⁽²⁾
4.89 mm × 3.90 mm
3.00 mm × 3.00 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) The DRC package for the TPS54335-1A device has a
narrower heat-pad for more clearance between the pins and
heat pad. See the Differences Between the Two DRC
Packages section.
Simplified Schematic
VIN
C₁
VIN
TPS54335A
EN
BOOT
PH
RT
COMP
C_C
R _RT ^{C 2} _{R C}
VSENSE
GND
C _BOOT
L_O
C_O
VOUT
R _O1
R _O2
VIN
C₁
VIN
TPS54336A
EN
SS
COMP
BOOT
PH
C _BOOT
L_O
C_O
C_C
C₂
R_C
C _SS
VSENSE
GND
VOUT
R _O1
R _O2
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.