TPS65581 Datasheet, PDF (1/28 Pages) Texas Instruments – 4.5V to 18V Input 1.5A, 2.5A, 1.5A Triple Synchronous Step-Down Converter

TPS65581
www.ti.com
SLVSC38A – OCTOBER 2013 – REVISED NOVEMBER 2013
4.5V to 18V Input 1.5A, 2.5A, 1.5A Triple Synchronous Step-Down Converter
Check for Samples: TPS65581
FEATURES
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•23 Advanced D-CAP2™ Control Mode
– Fast Transient Response
– No External Parts Required For Loop
Compensation
– Compatible with Ceramic Output
Capacitors
• Wide Input Voltage Range : 4.5 V to 18 V
• Output Voltage Range : 0.76 V to 7 V
• Highly Efficient Integrated FETs Optimized for
Low Duty Cycle Applications
– 160 mΩ (High Side) and 130 mΩ (Low Side)
for 2.5A
– 250mΩ (High Side) and 230mΩ (Low Side)
for 1.5A
• High Initial Reference Accuracy
• Low-Side R_DS(on) Loss-Less Current Sensing
• Fixed 1.2 ms Soft Start
• Non-Sinking Pre-Biased Soft Start
• 700 kHz Switching Frequency
• Cycle-by-Cycle Over-Current Limiting Control
• OCL, OVP, UVP, UVLO, TSD Protections
• Hiccup Timer for Over Load Protection
• PowerGood
• Adaptive Gate Drivers with Integrated Boost
PMOS Switch
• OCP Constant Due To Thermally Compensated
R_DS(on) with 4000ppm/℃
• 20-Pin HTSSOP
• Auto-Skip Eco-mode ™ for High Efficiency at
Light Load
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 TPS65581 is a triple, advanced D-CAP2™ mode
synchronous buck converter. The TPS65581 enables
system designers to complete the suite of various
end equipment’s power bus regulators with a cost
effective, low component count, and low standby
current solution. The main control loops of the
TPS65581 uses the advanced D-CAP2™ mode
control which provides a fast transient response with
no external compensation components. Advanced D-
CAP2™ mode control supports seamless transition
between PWM mode at higher load conditions and
Eco-mode™ allows the TPS65581 to maintain high
efficiency during light load conditions. The device is
able 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 4.5V to 18V.
The TPS65581 is available in 4.4mm x 6.5mm 20 pin
TSSOP (PWP) package, 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, Eco-mode are trademarks of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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