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MIC49150
Micrel
MIC49150
1.5A Low Voltage LDO Regulator w/Dual Input Voltages
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 pack-
age 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 MSOP-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
IN
OUT
OUTPUT VOLTAGE
50mV/div
Load Transient Response
V
IN
= 1.8V
V
BIAS
= 3.3V
C
BIAS
= 1µF
Ceramic
MIC49150BR
V
OUT
= 1.0V
R1
BIAS
ADJ
GND
R2
C
OUT
=
1µF
Ceramic
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1V
C
OUT
= 1µF ceramic
C
IN
= 1µF
Ceramic
Low Voltage,
Fast Transient Response Regulator
OUTPUT CURRENT
1A/div
TIME (10µs/div.)
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2005
1
M9999-082505-B
MIC49150
Micrel
Part Number
Output
Current
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
Voltage
Junction Temp. Range
Package
Ordering Information
Standard
MIC49150-0.9BMM
MIC49150-1.2BMM
MIC49150-1.5BMM
MIC49150-1.8BMM
MIC49150BMM
MIC49150-0.9BR
MIC49150-1.2BR
MIC49150-1.5BR
MIC49150-1.8BR
MIC49150BR
Pb-Free /
RoHS Compliant
MIC49150-0.9YMM
MIC49150-1.2YMM
MIC49150-1.5YMM
MIC49150-1.8YMM
MIC49150YMM
MIC49150-0.9WR*
MIC49150-1.2WR*
MIC49150-1.5WR*
MIC49150-1.8WR*
MIC49150WR*
0.9V
1.2V
1.5V
1.8V
Adj.
0.9V
1.2V
1.5V
1.8V
Adj.
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Power MSOP-8
Power MSOP-8
Power MSOP-8
Power MSOP-8
Power MSOP-8
S-Pak-5
S-Pak-5
S-Pak-5
S-Pak-5
S-Pak-5
* RoHS compliant with "high-melting solder" exemption.
Pin Configuration
EN/ADJ.
1
VBIAS
VIN
VOUT
8
7
6
5
GND
GND
GND
GND
TAB
2
3
4
5
4
3
2
1
VOUT
VIN
GND
VBIAS
EN/ADJ.
Power MSOP-8 (MM)
5-Lead S-Pak (R)
Pin Description
MIC49150
MSOP8
1
MIC49150
S-Pak
1
Pin Name
Enable
ADJ.
3
4
2
5/6/7/8
4
5
2
3
VIN
VOUT
VBIAS
GND
Pin Function
Enable (Input): CMOS compatible input. Logic high = enable, logic low =
shutdown.
Adjustable regulator feedback input. Connect to resistor voltage divider.
Input voltage which supplies current to the output power device.
Regulator Output.
Input Bias Voltage for powering all circuitry on the regulator with the excep-
tion of the output power device.
Ground (TAB is connected to ground on S-Pak).
M9999-082505-B
2
August 2005
MIC49150
Micrel
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................................ 8V
Bias Supply Voltage (V
BIAS
) ............................................ 8V
Enable Input Voltage (V
EN
) ............................................. 8V
Power Dissipation ..................................... Internally Limited
ESD Rating
(3)
............................................................... 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) .........................................1.4V to 6.5V
Bias Supply Voltage (V
BIAS
) ................................3V to 6.5V
Enable Input Voltage (V
EN
) .................................0V to 6.5V
Junction Temperature Range ..............–40°C ≤T
J
≤ +125°C
Package Thermal Resistance
MSOP-8
(θ
JA
)
....................................................................
80°C/W
S-PAK(θ
JC
) ........................................................... 2°C/W
Electrical Characteristics
(4)
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage (V
IN
- V
OUT
)
T
A
= 25°C with V
BIAS
= V
OUT
+2.1V; V
IN
= V
OUT
+ 1V, unless otherwise specified;
bold
values indicate –40°C < T
J
< +125°C
(5)
Conditions
Min
–1
–2
–0.1
0.01
0.2
130
280
1.3
1.65
15
15
0.5
9
32
1.6
2.3
Typ
At 25°C
Over temperature range
V
IN
= V
OUT
+1V to 6.5V
I
L
= 0mA to 1.5A
I
L
= 750mA
I
L
= 1.5A
Dropout Voltage (V
BIAS
- V
OUT
)
Note 5
Ground Pin Current
Note 6
I
L
= 750mA
I
L
= 1.5A
I
L
= 0mA
I
L
= 1.5A
V
EN
≤ 0.6V, (I
BIAS
+ I
CC
)
Note 7
I
L
= 0mA
I
L
= 1.5A
MIC49150
+1
+2
Max
Units
%
%
%/V
%
%
mV
mV
mV
mV
V
V
V
mA
mA
mA
µA
µA
mA
mA
mA
A
A
V
V
µA
V
V
+0.1
1
1.5
200
300
400
500
1.9
2.1
25
30
1
2
15
25
3.5
4
Ground Pin Current in Shutdown
Current thru V
BIAS
Current Limit
Enable Input (Note 7)
Enable Input Threshold
(Fixed Voltage only)
Enable Pin Input Current
Reference
Reference Voltage
Notes
Regulator enable
Regulator shutdown
Independent of state
1.6
0.1
0.891
0.882
0.9
0.6
1
0.909
0.918
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
5. For V
OUT
≤1V, V
BIAS
dropout specification does not apply due to a minimum 3V V
BIAS
input.
7. Fixed output voltage versions only.
6. I
GND
= I
BIAS
+ (I
IN
– I
OUT
). At high loads, input current on V
IN
will be less than the output current, due to drive current being supplied by V
BIAS
.
August 2005
3
M9999-082505-B
MIC49150
Micrel
Functional Diagram
V
BIAS
V
IN
Ilimit
V
EN
/
ADJ
Fixed
Enable
Bandgap
Adj.
V
IN
Open
Circuit
Fixed
R1
R2
V
OUT
M9999-082505-B
4
August 2005
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