Power Distribution Switch has input voltage of 0.8 V.
March 18, 2004 - MIC2044/45 Protected High-Side Power Switch features 30 mOhm maximum On-resistance and operating range of 0.8-5.5 V with continuous output current of 6 A. Other features include programmable current limit, short circuit protection, thermal shutdown, adjustable slew rate control, fault status flag, under-voltage lockout, and low quiescent current. Applications include PCs, laptops, PDAs, docking stations, LAN servers, WAN switches, base stations, and RAID controllers.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Micrel Semiconductor Inc.
1849 Fortune Dr.
San Jose, CA, 95131
USA
Micrel's New Family of High-Current, Low-Voltage, Protected-Power Distribution Switches with Input Voltages Down to 0.8V
• Highest current rating of any integrated protected power switch
• Breaks the 1V and below operating barrier
SAN JOSE, Calif. - (January 22, 2004) - Two new power control solutions for stationary and portable electronic systems such as PCs, servers, laptops and protected battery packs are introduced by Micrel Semiconductor (Nasdaq: MCRL) an industry leader in the design and manufacture of integrated circuits for the analog, power management, and high-speed communication markets.
The MIC204x family offers the highest performance, smallest size and most efficient power management solution for electronic power control in the industry today. MIC2044/45, the first two members in this new family of monolithic high-side power-switches, achieve record setting performance in both current handling ability and low voltage operation. Until now, power-switching solutions handling currents in excess of 3A required the use of external power FETs. The MIC2044/45 has improved that by integrating a unique, high-efficiency NMOS pass element with control circuitry into a TSSOP package to control load currents in excess of 6A. "These are really incredible devices for their size and performance. The NMOS FET switch is so efficient that in a typical 20mOhm device, the heavy duty bond wires and package leads account for more than half of the total ON resistance," said Thruston Awalt, product marketing manager.
Further, MIC2044/45 will operate with input voltages as low as 0.8V, also an industry first. "The march toward sub-lV power supplies continues unabated. MIC2044/45's ability to operate with inputs below IV make today's designs forward compatible with
tomorrow's microprocessor and ASIC technologies," added Await.
A rich feature set making MIC2044/45 the ideal solution for a wide range of applications compliments this unprecedented performance. First and foremost, MIC2044/45 is a current-limiting device, and the user has full control over the limiting
point by the selection of a single external reference resistor. The power switches are fully self-protected, incorporating on-chip temperature sensing and shutdown circuitry to keep both the device and the load safe under short circuit or catastrophic failure conditions. Response to a fault can be either to limit the load current supplied, as in the case of the MIC2044, or to act like a circuit breaker (MIC2045) and shut off all current to the load until the fault condition has cleared and then re-energize (auto-retry).
For system applications requiring soft start, to limit RFI and prevent glitching the system power mains, MIC2044/45 offers slew rate control, allowing the load to be brought online gracefully instead of abruptly.
User-controlled UVLO (Under Voltage Lock Out) ensures no power is applied to the load until the input supplies have reached their full operational value and a Power Good output comparator signals when the load has achieved it's intended operating voltage.
Power to the load can by cycled on-off by toggling the ENABLE input, making the MIC2044/45 ideal for hot swapping and power sequencing applications. "These are truly versatile devices, and very easy to use," adds Awalt.
In thousand-piece quantities, the MIC2044/45 starts at $2.22 each. Samples are from stock, and production quantities are stock to 8 weeks ARO.
Summary of Features and Applications
MIC2044/45 Protected High-Side Power Switches
Features
• 30mOhm maximum ON-resistance
• 0.8V - 5.5V operating range
• 6A continuous output current
• Programmable current limit
• Power Good detection
• Short circuit protection
• Thermal shutdown
• Very fast reaction to short circuits
• Adjustable slew rate control
• Circuit breaker mode (MIC2045)
• Fault status flag
• Under-voltage lockout
• No reverse current flow when off
• Low quiescent current
Applications
• PCs
• Laptops
• PDAs
• Docking stations
• Battery pack protection and safety control
• Hot swap board insertion
- LAN servers
- WAN switches
- Base stations
- RAID controllers
Micrel, Inc. is a leading manufacturer of advanced, high performance communications, clock management, Ethernet switch and physical layer transceiver, mixed signal, analog and power ICs. These products include devices for fiber-optic telecommunications and networking, cellular telephones, servers, portable computer systems, computer peripherals, process control systems, consumer- electronics and power supplies. |
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