MIC49150 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 1.5A Low Voltage LDO Regulator w/Dual Input Voltages

MIC49150
Micrel
MIC49150
1.5A Low Voltage LDO Regulator w/Dual Input Voltages
Final Information
General Description
The MIC49150 is a high-bandwidth, low-dropout, 1.5A volt-
age regulator ideal for powering core voltages of low-power
microprocessors. The MIC49150 implements a dual supply
configuration allowing for very low output impedance and
very fast transient response.
The MIC49150 requires a bias input supply and a main input
supply, allowing for ultra-low input voltages on the main
supply rail. The input supply operates from 1.4V to 6.5V and
the bias supply requires between 3V and 6.5V for proper
operation. The MIC49150 offers fixed output voltages from
0.9V to 1.8V and adjustable output voltages down to 0.9V.
The MIC49150 requires a minimum of output capacitance for
stability, working optimally with small ceramic capacitors.
The MIC49150 is available in an 8-pin power MSOP package
and a 5-pin S-Pak. Its operating temperature range is –40°C
to +125°C.
Features
• Input Voltage Range:
V_IN: 1.4V to 6.5V
V_BIAS: 3.0V to 6.5V
• Stable with 1µF ceramic capacitor
• ±1% initial tolerance
• Maximum dropout voltage (V_IN-V_OUT) of 500mV over
temperature
• Adjustable output voltage down to 0.9V
• Ultra fast transient response (Up to 10MHz bandwidth)
• Excellent line and load regulation specifications
• Logic controlled shutdown option
• Thermal shutdown and current limit protection
• Power MSO-8 and S-Pak packages
• Junction temperature range: –40°C to 125°C
Applications
• Graphics processors
• PC Add-In Cards
• Microprocessor core voltage supply
• Low voltage digital ICs
• High Efficiency Linear power supplies
• SMPS post regulators
Typical Application
V_IN = 1.8V
V_BIAS = 3.3V
C_BIAS = 1µF
Ceramic
MIC49150BR
IN
OUT
BIAS ADJ
GND
V_OUT = 1.0V
R1
R2 ^COUT ^{= 1µF}
Ceramic
C_IN = 1µF
Ceramic
Low Voltage,
Fast Transient Response Regulator
Load Transient Response
V_BIAS = 3.3V
V_IN = 1.8V
V_OUT = 1V
C_OUT = 1µF
TIME (10µs/div.)
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2002
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MIC49150