TPS54328 Datasheet, PDF (1/21 Pages) Texas Instruments – 4.5V to 18V Input, 3-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™

TPS54328
www.ti.com
SLVSAN2 – NOVEMBER 2010
4.5V to 18V Input, 3-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™
Check for Samples: TPS54328
FEATURES
1
•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 7.0 V
• Highly Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications
– 100 mΩ (High Side) and 70 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
• 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 TPS54328 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54328
enables system designers to complete the suite of
various end-equipment power bus regulators with a
cost effective, low component count, low standby
current solution. The main control loop for the
TPS54328 uses the D-CAP2™ mode control that
provides a 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
TPS54328 to maintain high efficiency during lighter
load conditions. The TPS54328 also has a proprietary
circuit that enables the device to adopt to both low
equivalent series resistance (ESR) output capacitors,
such as POSCAP or 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 7.0 V. The device
also features an adjustable soft start time. The
TPS54328 is available in the 8-pin DDA package,
and designed to operate from –40°C to 85°C.
V_O = 50 mV / div (-950 mV dc offset)
I_O = 1 A / div (0.75 to 2.25 A load step,
slew rate = 1 A / µsec)
Time = 50 µsec / div
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.
D-CAP2, Eco-mode are trademarks of Texas Instruments.
2
Blu-ray Disc is a trademark of Blu-ray Disc Association.
3
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