TPS54335_13 Datasheet, PDF (1/40 Pages) Texas Instruments – 4.5V to 28V Input, 3A Output, Synchronous SWIFT Step-Down Voltage Regulator

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TPS54335
TPS54336
SLVSC03B – MAY 2013 – REVISED NOVEMBER 2013
4.5V to 28V Input, 3A Output, Synchronous SWIFT™ Step-Down Voltage Regulator
Check for Samples: TPS54335, TPS54336
FEATURES
1
•2 Two 128mΩ/84mΩ MOSFETs for 3A
Continuous Output Current
• TPS54335: Internal 2ms Soft-start,
50kHz–1.5MHz Adjustable Frequency
• TPS54336: Adjustable Soft-start, Fixed 340kHz
Frequency
• Low 2µA Shutdown Quiescent Current
• 0.8V Internal Voltage Reference with ±0.8%
Accuracy at Room Temperature and ±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 Shutdown and Overvoltage Transition
Protection
• Available in Easy-to-Use 8-Pin SOIC
PowerPAD™ and 10-pin SON
• Monotonic Start-Up into Pre-biased Outputs
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
• 5V,12V and 24V Distributed Power Bus Supply
DESCRIPTION
The TPS54335/54336 is a 3A, low quiescent supply
current (I_Q), synchronous DC-DC converter IC
(integrated circuit) with up to 28V input support.
By integrating MOSFETs and by employing current
mode switching control, the TPS54335/54336 offers
compact designs on PCB (printed circuit board)
reducing external component count.
Efficiency is maximized through the integrated
128mΩ/84mΩ MOSFETs, low I_Q and pulse skipping
at light loads. Using the enable pin, shutdown supply
current is reduced to 2 μA by entering a shutdown
mode.
This step-down (buck) converter provides accurate
regulation for a variety of loads with a well-regulated
voltage reference 1.5% over temperature.
Cycle by cycle current limiting on the high-side
MOSFET protects the TPS54335/54336 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
VIN
C₁
VIN
TPS54335
EN
RT
COMP
BOOT
PH
C_C
R_RT ^C2
R_C
VSENSE
GND
C_BOOT
L_O
C_O
VOUT
R_O1
R_O2
VIN
VIN
C₁
TPS54336
EN
SS
COMP
BOOT
PH
C_C
C₂
C_SS
R_C
VSENSE
GND
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, SWIFT are trademarks of Texas Instruments.
2
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated