TPS65280 Datasheet, PDF (1/32 Pages) Texas Instruments – DUAL POWER DISTRIBUTION SWITCH AND MONOLITHIC SYNCHRONOUS BUCK REGULATOR WITH 5.5-V TO 18-V INPUT VOLTAGE, FIXED 5-V OUTPUT VOLTAGE AND

TPS65280
www.ti.com
SLVSBE4 – JUNE 2012
DUAL POWER DISTRIBUTION SWITCH AND MONOLITHIC SYNCHRONOUS BUCK
REGULATOR WITH 5.5-V TO 18-V INPUT VOLTAGE, FIXED 5-V OUTPUT VOLTAGE AND
4-A MAXIMUM CURRENT
Check for Samples: TPS65280
FEATURES
1
• Over Temperature Protection
• 24-Lead QFN (RGE) 4-mm x 4-mm Package
xxx
INTEGRATED DUAL POWER DISTRIBUTION
SWITCHES
• Operating Input Voltage Range: 2.5 V to 6 V
• Integrated Back-to-Back Power MOSFETs With
80-mΩ On-Resistance
• Up to 1-A Maximum Load Current
• Current Limiting at Typical 1.2 A (0.8 A,1.6 A or
2 A Available With Manufacture Trim Options)
• Latch-off Over Current Protection Versions
• Reverse Input-Output Voltage Protection
• Built-In Soft-Start
• 4-kV HBM and 200-V MM ESD Protection at
Power Switch Output Pins
15-kV ESD Protection per IEC 61000-4-2 With
10-µF External Capacitance
xxx
xxx
xxx
xxx
INTEGRATED BUCK DC/DC CONVERTER
• Wide Input Voltage Range: 5.5 V to 18 V
• Maximum Continuous 4-A Output Load
Current
• Fixed Output Voltage: 5 V ±1%
• Adjustable 300-kHz to 1.4-MHz Switching
Frequency
• External Clock Synchronization
• Adjustable Soft Start and Tracking With
Built-In 1-ms Internal Soft-start Time
• Cycle-by-Cycle Current Limit
• Output Over-voltage Protection
APPLICATIONS
• USB Ports and Hubs
• Digital TV
• Set-Top Boxes
• VOIP Phones
• Tablet PC
DESCRIPTION/ORDERING INFORMATION
The TPS65280 incorporates dual N-channel MOSFET power switches for USB power distribution systems that
require dual power switches in a single package. It also integrates a buck converter which regulates an accurate
5-V output voltage from a 5.5-V to 18-V power bus to supply the power for power switches. The device is
intended to provide a total USB power distribution solution for digital TV, set-top boxes, VOIP phones and tablet
PC applications, where precision current limiting is required or heavy capacitive loads or short circuits are
encountered.
A dual 85-mΩ independent power distribution switch limits the output current to a typical 1.2 A (manufacture trim
0.8 A, 1.6 A, and 2 A available options) when output current load exceeds the current limit threshold. TPS65280
device limits output current to a safe level by using a constant current mode when output load exceeds the
current limit threshold. After delitching time, TPS65280 provides circuit breaker functionality by latching off the
power switch during over-current or reverse-voltage situations. Two back-to-back power MOSFETs prevent the
current injects from output to input in shutdown. An internal reverse-voltage comparator disables the power
switch when the output voltage is driven higher than the input to protect the circuits on the input side of the
switch in normal operation. The nFAULT1/2 output asserts low during over-current and reverse-voltage
conditions.
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.
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 © 2012, Texas Instruments Incorporated