TPS54425_15 Datasheet, PDF (1/25 Pages) Texas Instruments – 4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT™)

www.ti.com
TPS54425
SLVSA84C – AUGUST 2010 – REVISED JULY 2011
4-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER
WITH INTEGRATED FET ( SWIFT™)
Check for Samples: TPS54425
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 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 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
DESCRIPTION
The TPS54425 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54425
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
TPS54425 uses the D-CAP2™ mode control which
provides a very fast transient response with no
external compensation components. The TPS54425
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 5.5 V. The device also features an adjustable
soft start time and a power good function. The
TPS54425 is available in the 14-pin HTSSOP
package, and designed to operate from –40°C to
85°C.
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)
Vout (50 mV/div)
Iout (2A/div)
100 ms/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.
SWIFT, D-CAP2, PowerPAD 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 © 2010–2011, Texas Instruments Incorporated