Power Distribution Switch has input voltage of 0.8 V.
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Press Release Summary:
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.
Original Press Release:
Micrel's New Family of High-Current, Low-Voltage, Protected-Power Distribution Switches with Input Voltages Down to 0.8V
o Highest current rating of any integrated protected power switch
o 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
o 30mOhm maximum ON-resistance
o 0.8V - 5.5V operating range
o 6A continuous output current
o Programmable current limit
o Power Good detection
o Short circuit protection
o Thermal shutdown
o Very fast reaction to short circuits
o Adjustable slew rate control
o Circuit breaker mode (MIC2045)
o Fault status flag
o Under-voltage lockout
o No reverse current flow when off
o Low quiescent current
Applications
o PCs
o Laptops
o PDAs
o Docking stations
o Battery pack protection and safety control
o 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.
