TPS54335 Datasheet, PDF (1/37 Pages) Texas Instruments – 4.5V to 28V Input, 3A Output, Synchronous Step Down SWIFT™ Converter

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TPS54335
TPS54336
SLVSC03 – MAY 2013
4.5V to 28V Input, 3A Output, Synchronous Step Down SWIFT™ Converter
Check for Samples: TPS54335 , TPS54336
FEATURES
1
•2 Two 128mΩ/84mΩ MOSFETs for 3A
Continuous Output Current
• TPS54335: Internal 2ms Slow Start,
50kHz–1.5MHz Adjustable
• TPS54336: Adjustable Slow Start, Fixed
340kHz
• Low 2uA Shutdown Quiescent Current
• 0.8V Internal Voltage Reference with ±1.5%
Accuracy Over Temperature
• Fixed-Frequency Current Mode Control
• Pulse Skipping Boosts Efficiency at Light
Loads
• Overcurrent Protection for Both MOSFETs
with Hiccup Mode for Severe Fault Conditions
• Thermal and Overvoltage Transient Protection
• Available in Easy-to-Use 8-Pin SOIC
PowerPAD™
• Monotonic Start-Up into Pre-biased Outputs
APPLICATIONS
• Consumer Applications such as DTV, Set Top
Boxes, LCD displays, CPE Equipment
• Battery Chargers
• Industrial and Car Audio Power Supplies
• 5V,12V and 24V Distributed Power Systems
DESCRIPTION
The TPS54335/6 is a 28V, 3A, low Iq, current mode,
synchronous monolithic buck converter with
integrated MOSFETs.
The TPS54335/6 enables small designs by
integrating the MOSFETs and implementing current
mode control to reduce external component count.
Efficiency is maximized through the integrated
128mΩ/84mΩ MOSFETs, low quiescent supply
current and pulse skipping at light loads. Using the
enable pin, shutdown supply current is reduced to 2
µA by entering a shutdown mode.
The TPS54335/6 provides accurate regulation for a
variety of loads with an accurate 1.5% voltage
reference over temperature.
Cycle by cycle current limiting on the high-side FET
protects the TPS54335/6 in overload situations and is
enhanced by a low-side sourcing current limit which
prevents current runaway. There is also a low-side
sinking current limit which turns off the low-side
MOSFET to prevent excessive reverse current.
Hiccup protection will be triggered if the overcurrent
condition has persisted for longer than the preset
time. Thermal hiccup protection disables the part
when die temperature exceeds thermal shutdown
temperature and enables the part again after the
built-in thermal hiccup time.
.
.
SIMPLIFIED SCHEMATICS
EN
VIN
TPS54335
BOOT
PH
RT
COMP
C_C
R_RT ^C2
R_C
VSENSE
GND
VIN
C₁
C_BOOT
L_O
C_O
VOUT
R_O1
R_O2
EN
VIN
TPS54336
BOOT
PH
SS
COMP
C_C
C₂
C_SS
R_C
VSENSE
GND
VIN
C₁
C_BOOT
L_O
C_O
VOUT
R_O1
R_O2
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.
PowerPAD 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 © 2013, Texas Instruments Incorporated