MIC49200 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 2A LOW VOLTAGE LDO WITH DUAL INPUT VOLTAGES

MIC49200
2A Low Voltage LDO
with Dual Input Voltages
General Description
The MIC49200 is a high-bandwidth, low-dropout, 2A
voltage regulator ideal for powering core voltages of low-
power microprocessors. The MIC49200 implements a
dual supply configuration allowing for very low output
impedance and very fast transient response.
The MIC49200 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 MIC49200 offers fixed output
voltages from 0.9V to 1.8V and adjustable output voltages
down to 0.9V.
The MIC49200 requires a minimum of output capacitance
for stability, working optimally with small ceramic
capacitors.
The MIC49200 is available in a 5-pin S-Pak. Its operating
temperature range is –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Typical Application
Features
• Input Voltage Range:
V_IN: 1.4V to 6.5V
V_BIAS: 3.0V to 6.5V
• Stable with 1µF ceramic output capacitors
• ±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
• Junction temperature range: –40°C to 125°C
Applications
• Set-top box
• Graphics processors
• PC add-in cards
• Microprocessor core voltage supply
• Low voltage digital ICs
• High efficiency linear power supplies
• SMPS post regulators
Load Transient
V_IN = 2.8V
V_OUT = 1.8V
V_BIAS = 4V
C_OUT = 1µF
Low Voltage, Fast Transient Response Regulator
Time (40µs/div)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2006
M9999-011306
[phone]