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New TI Hot Swap Controller Eliminates OR-ing Diodes for Reduced Heat Sink, Increased Power Gain

TPS2350 Manager Achieves Greater Efficiency, Protection for Redundant -48 V Telecom Power Supplies

Aug 19, 2003

DALLAS (Aug. 19, 2003) - Providing designers with new advancements in high performance hot swap technology, Texas Instruments Incorporated (TI) (NYSE: TXN) today announced an intelligent hot swap controller that eliminates the need for OR-ing diodes in redundant -48 V systems. The simple-to-program device, ideally suited for distributed power systems such as wireless base stations and central office switching, offers greater levels of power efficiency and performance and effectively minimizes system power dissipation and voltage drop. See power.ti.com/sc03166.

Allowing precise control of current and voltage during turn-on and operation, TI's TPS2350 hot swap power manager operates with supply voltages ranging from -12 V to -80 V, and can withstand spikes to -100 V. Minimizing power dissipation and voltage loss, the TPS2350 device uses two power field effect transistors (FETs) as low voltage drop diodes to efficiently select between two redundant power supplies. The controller, which uses less than 10 external components, incorporates a third FET to provide hot swap load current slew rate control and peak magnitude limiting that is programmed by one resistor and one capacitor.
Traditional diode OR-ing methods for connecting redundant power supplies often result in power losses and uncontrolled inrush over-current. While some limitations can be addressed with a simple hot-swap controller, the TPS2350 provides the industry's best power-efficient remedy for these issues. Allowing a significantly less amount of power loss, TI's controller integrates programmable features such as undervoltage and overvoltage limits, circuit breaking and a fault timer, all on one device.
The low loss of power achieved through the TPS2350 greatly enhances applications designed to support PCI Industrial Computer Manufacturers Group´s (PICMG) Advanced Telecom Computing Architecture (AdvancedTCATM) specification. The device also allows application developers to meet the one percent undervoltage lockout (UVLO) specifications of the AT&T Network Equipment Development Standards (NEDS v4.0) and the American National Standard (ANSI 315) for Telecommunications. 
The TPS2350 also provides a power good output to enable down-stream power converters and a fault output to indicate load programs.

Key features include:

  • Replaces OR-ing Diodes in Redundant Systems 
  • Wide Input Supply Range of -12 V to -80 V 
  • Transient Rating to -100 V 
  • Programmable Current Limit 
  • Programmable Current Slew Rate 
  • Programmable UV/OV Thresholds and Hysteresis 
  • Open-Drain Power Good (PG) Output 
  • Fault Timer to Eliminate Nuisance Trips 
  • Open-Drain Fault Output 
  • -40º C to 85º C Ambient Operating Range 

Available Today

TPS2350 is shipping in volume today in a 14-pin thin shrink small outline package (TSSOP), and is priced at $1.90 per 1,000 units. Evaluation modules of the TPS2350 can be obtained in less than 24 hours through power.ti.com.