TPS53125 Datasheet, PDF (1/22 Pages) Texas Instruments – DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS

TPS53125
www.ti.com
SLVS947A – OCTOBER 2009 – REVISED OCTOBER 2009
DUAL SYNCHRONOUS STEP-DOWN CONTROLLER
FOR LOW VOLTAGE POWER RAILS
Check for Samples: TPS53125
FEATURES
1
•2 D-CAP2™ Mode Control
– Fast Transient Response
– No External Parts Required for Loop
Compensation
– Compatible With Ceramic Output
Capacitors
• High Initial Reference Accuracy (±1%)
• Low Output Ripple
• Wide Input Voltage Range:4.5 V to 24 V
• Output Voltage Range: 0.76 V to 5.5 V
• Low-Side R_DS(ON) Loss-Less Current Sensing
• Adaptive Gate Drivers with Integrated Boost
Diode
• Adjustable Soft Start
• Non-Sinking Pre-Biased Soft Start
• 350-kHz Switching Frequency
• Cycle-by-Cycle Over-Current Limiting Control
• 30-mV to 300-mV OCP Threshold Voltage
• Thermally Compensated OCP by 4000 ppm/°C
at I_TRIP
APPLICATIONS
• Point-of-Load Regulation in Low Power
Systems for Wide Range of Applications
– Digital TV Power Supply
– Networking Home Terminal
– Digital Set-Top Box (STB)
– DVD Player/Recorder
– Gaming Consoles
DESCRIPTION
The TPS53125 is a dual, adaptive on-time D-CAP2™
mode synchronous buck controller. The part enables
system designers to cost effectively complete the
suite of various end equipment's power bus
regulators with a low external component count and
low standby consumption. The main control loop for
the TPS53125 uses the D-CAP2™ Mode topology
which provides a very fast transient response with no
external component.
The TPS53125/7 also has a proprietary circuit that
enables the device to adapt not only low equivalent
series resistance (ESR) output capacitors such as
POSCAP/SP-CAP, but also ceramic capacitor. The
part provides a convenient and efficient operation
with conversion voltages from 4.5 V to 24 V and
output voltage from 0.76 V to 5.5 V.
The TPS53125 is available in the 24 pin RGE/PW
package, and is specified from –40°C to 85°C
ambient temperature range.
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 is a trademark of Texas Instruments.
2
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 © 2009, Texas Instruments Incorporated