MIC49500
5A Dual Supply, Low Voltage,
High Bandwidth LDO
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2007
M9999-071307
General Description
The MIC49500 is an ultra-high-bandwidth, low-
dropout, 5.0A voltage regulator ideal for powering
core voltages of low-voltage microprocessors. The
MIC49500 implements a dual supply configuration
allowing for very low output impedance and very fast
transient response.
The MIC49500 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 6V and the bias supply requires between
3V and 6V for proper operation. The MIC49500 can
regulate to an output voltage as low as 0.7V, making it
an ideal product for low-voltage to low-voltage
conversion.
The MIC49500 requires a minimum of output
capacitance for stability, working optimally with any
type of capacitor, including small ceramic capacitors.
Available in fixed output voltages from 0.9V to 1.8V
and adjustable output voltages down to 0.7V, the
MIC49500 comes in both 7-pin S-Pak and TO-263
packages. The MIC49500 is rated to the full operating
temperature range of –40°C to 125°C junction
temperature.
Features
• Input voltage range:
– V
IN
: 1.4V to 6V
– V
BIAS
: 3.0V to 6V
• Stable with 10µF ceramic output capacitor
• +
1.0% initial output tolerance
• Maximum dropout (V
IN
– V
OUT
) is 500mV over
temperature
• Adjustable output voltage down to 0.7V
• Ultra Fast Transient Response (Up to 10MHz
bandwidth)
• Excellent line and load regulation specifications
• Logic controlled shutdown option
• Thermal shutdown and current limit protection
• Thin 7-pin S-Pak package
• TO-263 7-pin package
• –40°C to +125°C operating junction temperature
range
Applications
• ASIC Core Voltage Regulator
• PLD/FPGA Core Power Supply
• Linear Point-of-Load Conversion
• High Speed Post-Regulator
Typical Application
IN
BIAS
OUT
ADJ
GND
MIC49500WR
V
OUT
= 1.0V
C
OUT
= 10µF
Ceramic
BIAS
= 3.1V
V
IN
= 2.0V
C
BIAS
= 1µF
Ceramic
C
IN
= 1µF
Ceramic
R1
R2
EN
ONOFF
Low Voltage,
Fast Transient Response Regulator
Load Transient
Output Voltage
(50mV/div)
Output Current
(2A/div)
Time (10µs/div)
5A
0A
V
OUT
= 1.8V
V
IN
= 2.8V
C
OUT
= C
BIAS
= 10µF
V
BIAS
= 3.9V
