TPS54426_10 Datasheet, PDF (1/22 Pages) Texas Instruments – 4.5V to 18V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™

TPS54426
www.ti.com
SLVSAD6 – AUGUST 2010
4.5V to 18V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™
Check for Samples: TPS54426
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: 4.5 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
– 65 mΩ (High Side) and 55 mΩ (Low Side)
• High Efficiency, less than 10 mA 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 TPS54426 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54426
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
TPS54426 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 TPS54426 to maintain high efficiency
during lighter load conditions. The TPS54426 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 4.5-V to 18-V VIN input. The output
voltage can be programmed between 0.76 V and 5.5
V. The device also features an adjustable soft start
time and a power good function. The TPS54426 is
available in the 14-pin HTSSOP package, and
designed to operate from –40°C to 85°C.
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 © 2010, Texas Instruments Incorporated