TPS65282

www.ti.com

SLVSBU5 – MARCH 2013

DUAL POWER DISTRIBUTION SWITCHES WITH 4.5-V to 18-V INPUT VOLTAGE,

4-A OUTPUT CURRENT SYNCHRONOUS BUCK REGULATOR

Check for Samples: TPS65282

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FEATURES

INTEGRATED POWER DISTRIBUTION SWITCH

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Adjustable 300-kHz to 1.4-MHz Switching

Frequency

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Operating Input Voltage Range: 2.5 V to 6.5 V

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Pulse Skipping Mode at Light Load Efficiency

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Integrated Back-to-Back Power MOSFETs With

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Adjustable Soft-Start and Tracking With

100-m

Ω On-Resistance

Built-In 1.2-ms Internal Soft-Start Time

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Adjustable Current Limit:

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Cycle-by-Cycle Current Limit

75 mA - 2.7 A (typical)

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Output Over-Voltage Protection

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±6% Current-Limit Accuracy at 1.7 A (typical)

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Power Good Indicator

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Latch-Off Over Current Protection Versions

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Over Temperature Protection

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Reverse Input-Output Voltage Protection

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24-Lead QFN (RGE) 4-mm x 4-mm Package

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Built-In Soft-Start

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4-kV HBM and 200-V MM ESD Protection at

APPLICATIONS

Power Switch Output Pins

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USB Ports and Hubs

xxx

INTEGRATED BUCK DC/DC CONVERTER

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Digital TV

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Wide Input Voltage Range: 4.5 V to 18 V

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Set-Top Boxes

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Maximum Continuous 4-A Output Current

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VOIP Phones

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Feedback Reference Voltage: 0.8 V ±1 %

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Tablet PC

DESCRIPTION

The TPS65282 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 monolithic converter. The device is

intended to provide a total USB power distribution solution for digital TV, set-top boxes, tablet PC and VOIP

phones etc applications, where precision current limiting is required or heavy capacitive loads or short circuits are

encountered.

Dual 100-m

Ω independent power distribution switch limits the output current to a programmable current limit

threshold between typical 75 mA and 2.7 A by using an external resistor. The current limit accuracy can be

achieved as tight as ±6% at higher current limit setting. TPS65282 device limits output current to a safe level by

using a constant current mode when output load exceeds the current limit threshold. After deglitching time,

TPS65282 provides circuit breaker functionality by latching off the power switch during over-current or reverse-

voltage situations. Two back-to-back power MOSFETs prevents 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.

The buck DC/DC converter integrates power MOSFETs for optimized power efficiency and reduced external

component. A wide 4.5-V to 18-V input supply range to buck encompasses most intermediate bus voltages

operating off 5-V, 9-V, 12-V or 15-V power bus. Peak current mode control simplifies the compensation and fast

transient response. Equipped with enable and soft-start pin, the DC/DC can be precisely sequenced and ramp up

in order to align with other rails in the system. Cycle-by-cycle over-current protection and operating in hiccup

mode limit MOSFET power dissipation during buck output short circuit or over loading fault conditions. The

switching frequency of the converter can be programmed from 300 kHz to 1.4 MHz with an external resistor at

ROSC pin. With ROSC pin connecting to V7V pin, floating, or grounding, a default fixed switching frequency can

be selected. The buck also features a pulse skipping mode (PSM), which allows a power loss reduction on the

input power supplied to the system to achieve high efficiency at light loading.

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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.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.