TPS54239_15 Datasheet, PDF (1/22 Pages) Texas Instruments – 4.5V to 23V Input, 2-A Synchronous Step-Down SWIFT™ Converter

TPS54239
www.ti.com
SLVSBT0 – JANUARY 2013
4.5V to 23V Input, 2-A Synchronous Step-Down SWIFT™ Converter
Check for Samples: TPS54239
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 23 V
• Output Voltage Range: 0.76 V to 7.0 V
• Highly Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications
– 140 mΩ (High Side) and 70 mΩ (Low Side)
• High Efficiency, less than 10 μA at shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 600-kHz Switching Frequency (f_SW)
• Cycle By Cycle Over Current Limit
DESCRIPTION
The TPS54239 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54239
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
TPS54239 uses the D-CAP2™ mode control that
provides a fast transient response with no external
compensation components. The TPS54239 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 23-V VIN input. The output voltage can
be programmed between 0.76 V and 7 V. The device
also features an adjustable soft start time. The
TPS54239 is available in the 8-pin DDA 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)
VIN
VOUT
TPS54239DDA
1 _VBST
8
SS
2
7
VIN
EN
EN
3
6
SW VREG5
4
GND
5
VFB
PwPd
9
VOUT
Vout (50 mV/div)
Iout (1 A/div)
100 us/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 is a trademark of Texas Instruments.
2
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 © 2013, Texas Instruments Incorporated