Low-Dropout Regulator has 3.0 A continuous output current.
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Press Release Summary:
With 0.9 V output voltage capability, MIC49300 dual supply LDO responds instantly to abrupt changes in load current. Main supply requires 400 mV headroom to maintain proper regulation, while second supply provides bias voltage to control circuit. Housed in S-Pak 5-lead package, product offers gain bandwidth of up to 10 MHz and supports input voltage as low as 1.4 V. Other features include thermal shutdown, current limit protection, and uCap stability.
Original Press Release:
Ultra-Fast 3A Low-Dropout Regulator Powers Low-Voltage Processor Cores Down to 0.9V
o Ideal for powering high speed, low-voltage DSPs, microcontrollers, digital logic
SAN JOSE, Calif. -- (August 18, 2003) - Extending the popular family of ultra-low output voltage, high-current low-dropout regulators (LDOs) that provide a well-regulated supply for next-generation processor cores, the MIC49300 is now available from Micrel Semiconductor (NASDAQ: MCRL), an industry leader in power management and high-speed communication ICs.
With its 3.0A output current and 0.9V output voltage capability, the MIC49300 is a dual supply LDO that responds instantly to any abrupt change in load current. The main supply to the device requires only 400mV headroom, or dropout voltage, under worst case conditions to maintain proper regulation, while a second, higher supply provides bias voltage to the control circuit.
The MIC49300 supports an input voltage as low as 1.4V, allowing for high efficiency conversion from low-voltage, high-current power rails. Other MIC49300 features include thermal shutdown, current limit protection and uCap stability -- the ability to use ceramic output capacitors. As a uCap regulator, the MIC49300 only requires a 1uF ceramic output capacitor for stability and is highly tolerant of any capacitance used on its output.
"In addition to its high current, low voltage capabilities, the MIC49300 features a gain bandwidth of up to 10MHz, enabling ultra-fast transient response. This allows the device to respond quickly to fast dynamic load changes in PC graphics card, communication and networking applications," said Steve Knoth, Product Marketing Manager for the LDO Products. "The MIC49300 provides a simple, low-cost, efficient, and yet high current-capable, solution."
Available in Micrel's new high-performance S-Pak 5-lead package, the MIC49300 is priced at $2.60 when purchased in a quantity of 1,000. Samples are available now, and production quantities are stock to 8 weeks ARO.
Summary of Features & Applications:
MIC49300 Ultra-Fast 3A Low-Dropout Regulator
Features
o 3.0A continuous output capability in S-Pak-5
o Ultra-fast transient response: 10MHz GBW
o Ultra-low dropout:
125mV typ @ 1.5A, 200mV over temp
280mV typ @ 3A, 400mV over temp
o Fixed 0.9V, 1.5V, and adjustable (down to 0.9V) outputs
o Wide input range:
Vin: 1.4V to 6.5V
Vbias: 3.0V to 6.5V
o uCap: Stable with only 10uF ceramic output capacitor
o Logic enable input
o Fully protected:
Current limit
Thermal shutdown
o Junction temperature range: -40degC to +125degC
Applications
o PC graphics cards
o Power supply for computers and communication systems
o High-efficiency linear power supplies
o Set-Top boxes
o Digital video recorders
o Game consoles
Micrel Semiconductor 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.
