TPS53126 Datasheet, PDF (1/30 Pages) Texas Instruments – DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS

TPS53126
www.ti.com........................................................................................................................................................................................................ SLUS909 – MAY 2009
DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
FEATURES
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•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
• Internal 1.2 ms Voltage-Servo Soft Start
• Pre-Biased Soft Start
• Selectable Switching Frequency: 350 kHz / 700
kHz
• 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 and Other
DESCRIPTION
The TPS53126 is a dual, adaptive on-time,
D-CAP2™ mode synchronous Buck controller. The
TPS53126 enables system designers to complete the
suite of various end equipment's power bus
regulators with a cost effective, low external
component count, and low standby current solution.
The main control loop for the TPS53126 uses the
D-CAP2™ mode control which provides a very fast
transient response with no external components. The
TPS53126 also has a proprietary circuit that enables
the device to adapt to both low equivalent series
resistance (ESR) output capacitors, such as
POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device provides convenient and
efficient operation with input voltages from 4.5 V to 24
V and output voltages from 0.76 V to 5.5 V.
The TPS53126 is available in 4mm x 4mm 24 pin
QFN (RGE) or 24 pin TSSOP (PW) packages and is
specified from –40°C to 85°C ambient temperature
range.
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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.
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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 © 2009, Texas Instruments Incorporated