TPS54429E_15 Datasheet, PDF (1/29 Pages) Texas Instruments – 7V to 18V Input, 4.5-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™

TPS54429E
www.ti.com
SLVSAS0 – FEBRUARY 2011
7V to 18V Input, 4.5-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™
Check for Samples: TPS54429E
FEATURES
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•23 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide V_IN Input Voltage Range: 7 V to 18 V
• Output Voltage Range: 0.76 V to 5.5 V
• Highly Efficient Integrated FET’s Optimized
for Lower Duty Cycle Applications
– 63 mΩ (High Side) and 55 mΩ (Low Side)
• High Efficiency, less than 10 μA at shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 700-kHz Switching Frequency (f_SW)
• Cycle By Cycle Over Current Limit
• Power Good Output
• Auto-Skip Eco-mode™ for High Efficiency at
Light Load
APPLICATIONS
• Wide Range of Applications for Low Voltage
System
– Digital TV Power Supply
– High Definition Blu-ray Disc™ Players
– Networking Home Terminal
– Digital Set Top Box (STB)
DESCRIPTION
The TPS54429E is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54429E
enables system designers to complete the suite of
various end equipment’s power bus regulators with a
cost effective, low component count, low standby
current solution. The main control loop for the
TPS54429E uses the D-CAP2™ mode control which
provides a very fast transient response with no
external compensation components. The adaptive
on-time control supports seamless transition between
PWM mode at higher load conditions and
Eco-mode™ operation at light loads. Eco-mode™
allows the TPS54429E to maintain high efficiency
during lighter load conditions. The TPS54429E also
has a proprietary circuit that enables the device to
adopt to both low equivalent series resistance (ESR)
output capacitors, such as POSCAP, SP-CAP, and
ultra-low ESR ceramic capacitors. The device
operates from 7-V to 18-V VIN input. The output
voltage can be programmed between 0.76V and
5.5V. The device also features an adjustable soft
start time and a power good function. The
TPS54429E is available in the 14-pin HTSSOP
package and the 16 pin QFN package, designed to
operate from –20°C to 85°C.
U1
TPS54429E
Vout (50 mV/div)
Iout (2 A/div)
100 ms/div
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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.
D-CAP2, Eco-mode, PowerPAD are trademarks of Texas Instruments.
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Blu-ray Disc is a trademark of Blu-ray Disc Association.
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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 © 2011, Texas Instruments Incorporated