TPS54334_15 Datasheet, PDF (1/37 Pages) Texas Instruments – TPS54334 4.2-V to 28-V Input Voltage, 3-A Output Current Synchronous SWIFT™ Step-Down Voltage Converter

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TPS54334
SLUSC26 – MAY 2015
TPS54334 4.2-V to 28-V Input Voltage, 3-A Output Current Synchronous SWIFT™
Step-Down Voltage Converter
1 Features
•1 Two 128mΩ/84mΩ MOSFETs for 3A Continuous
Output Current
• Power Good
• Low 2 µA Shutdown Quiescent Current
• 0.8 V 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™ and 10-Pin SON
• Monotonic Start-Up into Pre-biased Outputs
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
• 5V,12 and 24V Distributed Power Bus Supply
3 Description
The TPS54334 is a 28-V, 3-A, low quiescent supply
current (I_Q), synchronous monolithic buck converter
with integrated MOSFETs.
The TPS54334 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 TPS54334 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 TPS54334 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
PART NUMBER
TPS54334
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
SO (8 Pin)
4.89 mm × 3.90 mm
VSON (10 Pin)
3.0 mm × 3.0 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
VIN=4.2 V to 24 V
VIN
R1
C1 C2 _{221 kΩ}
10µF 0.1µF
R2
84.5 kΩ
C5
150 pF
R3
2.05 kΩ
C4
0.015 µF
U1
TPS54334DRC
1 _VIN
10
PGOOD
BOOT ⁹
R7 100 kΩ
VDD
C3
L1 6.8 µH
8 _EN
0.1 µF
SW ²
7 _COMP
VSENSE ⁶
3,4,5
GND
C6
22 µF
VOUT= 3.3 V
VOUT
C7
R4
22 µF
51.1 Ω
C8
200 pF
R5
31.6 kΩ
R6
10 kΩ
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.