TPS65230 Datasheet, PDF (1/26 Pages) Texas Instruments – POWER MANAGEMENT IC FOR DIGITAL SET TOP BOXES

TPS65230, TPS65231
www.ti.com.................................................................................................................................... SLVSA10A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009
POWER MANAGEMENT IC FOR DIGITAL SET TOP BOXES
FEATURES
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• Wide Input Supply Voltage Range
(10.8 V - 22 V)
• One Adjustable PWM Buck Controller
– 10.8-V - 22-V Input Voltage Range
– 3.3-V - 6.1-V Output Voltage Range
– 500kHz switching frequency
– Type III Compensation
– Programmable Current Limit
• Two Adjustable Step-Down Converter with
Integrated Switching FETs:
– 4.75-V - 5.5-V Input
– 0.9-V-3.3-V Output Voltage Range
– 3-A Output Current
– 1-MHz Switching Frequency
– Voltage Scaling Option
– Type III Compensation
• Two 100-mΩ, 0.5-A (TPS65230) 1-A (TPS65231)
USB Switches with Over Current Protection
and Open-Drain Fault Pin
• Early Supply Failure Flag (Open Drain Output)
is Set when Input Voltage Drops Below 9.3 V
• Early Temperature Warning Flag (Open Drain
Output) is Set if Temperature Approaches
Shut-Down Threshold
• Supply Voltage Supervisor Circuit with Two
Monitor Inputs and Open Drain Output
• Parallel I/O or I²C Control with User Selectable
Address
• Advanced Fault Detection and Output Voltage
Adjustment Options in I²C Mode
• Pull-Up Current Sources on Buck Enable Pins
for Accurate Start-Up Timing Control with
Preset Default
• Over Current Protection on All Rails
• Thermal Shutdown to Protect Device During
Excessive Power Dissipation
• Thermally Enhanced Package for Efficient
Heat Management (48-pin HTSSOP)
APPLICATIONS
• Digital Set Top Boxes
• xDSL & Cable Modems
• DVD Players
• Home Gateway and Access Point Networks
• Wireless Routers
DESCRIPTION/ORDERING INFORMATION
The TPS652x provides one PWM buck controller, two adjustable, synchronous buck regulators, two independent
USB power switches and a supply voltage supervisor (SVS) to provide main power functions for satellite set top
boxes, xDSL and cable modem applications operating off a single 12- to 22-V supply.
The SMPS have integrated switching FETs for optimized power efficiency and reduced external component
count. Each USB switch provides up to 0.5-A (TPS65230) or 1-A (TPS65231) of current as required by
downstream USB devices. All power blocks have thermal and over current/short circuit protection.
The SVS provides two inputs for monitoring positive supply rails. The active-low open-drain output remains low
for at least 180 ms after all supply rails rise above their rising edge threshold. Threshold value for VMON1 input
is set for monitoring a 3.3-V rail without the need for additional external components. Threshold for VMON2 input
is set to 0.8 V and requires resistor dividers on the input to monitor any positive voltage in the system. The
nBOR/nHOT open-drain output is pulled low if the input supply drops below 9.3 V or the chip temperature
approaches the thermal shutdown limit. This allows the system processor to save critical data and shut down
gracefully before the supply fails.
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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.
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