MIC49300
Micrel
MIC49300
3.0A Low Voltage LDO Regulator w/Dual Input Voltages
General Description
The MIC49300 is a high-bandwidth, low-dropout, 3.0A volt-
age regulator ideal for powering core voltages of low-power
microprocessors. The MIC49300 implements a dual supply
configuration allowing for very low output impedance and
very fast transient response.
The MIC49300 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 MIC49300 offers fixed output voltages from
0.9V to 1.8V and adjustable output voltages down to 0.9V.
The MIC49300 requires a minimum of output capacitance for
stability, working optimally with small ceramic capacitors.
The MIC49300 is available in a 5-pin S-Pak. It operates over
a junction temperature range of 鈥?0擄C to +125擄C.
Features
鈥?Input Voltage Range:
V
IN
: 1.4V to 6.5V
V
BIAS
: 3.0V to 6.5V
鈥?/div>
Stable with 1
碌
F ceramic capacitor
鈥?/div>
鹵1%
initial tolerance
鈥?Maximum dropout voltage (V
IN
-V
OUT
) of 500mV over
temperature
鈥?/div>
Adjustable output voltage down to 0.9V
鈥?Ultra fast transient response (Up to 10MHz bandwidth)
鈥?Excellent line and load regulation specifications
鈥?Logic controlled shutdown option
鈥?Thermal shutdown and current limit protection
鈥?Power S-Pak package
鈥?Junction temperature range: 鈥?0擄C to 125擄C
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Graphics processors
PC Add-In Cards
Microprocessor core voltage supply
Low voltage digital ICs
High Efficiency Linear power supplies
SMPS post regulators
Typical Application
Load Transient Response
IN
OUT
R1
V
BIAS
= 3.3V
C
BIAS
= 1
碌F
Ceramic
C
IN
= 1
碌F
Ceramic
BIAS
ADJ
R2 C
OUT
=
10碌F
Ceramic
V
OUT
20mV/div
V
IN
= 1.5V
MIC49300BR
V
OUT
= 1.0V
GND
V
BIAS
= 5V
V
IN
= 2.5V
V
OUT
= 1.8V
C
OUT
= 10碌F Ceramic
Low Voltage,
Fast Transient Response Regulator
I
OUT
2A/div
TIME (20碌s/div.)
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
October 2003
1
MIC49300
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