January 2002
1
MIC49150
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.
Typical Application
MIC49150BR
GND
C
OUT
=
1
F
Ceramic
BIAS
IN
OUT
C
BIAS
= 1
F
Ceramic
V
OUT
= 1.0V
V
IN
= 1.8V
V
BIAS
= 3.3V
ADJ
C
IN
= 1
F
Ceramic
R1
R2
Low Voltage,
Fast Transient Response Regulator
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
Load Transient Response
TIME (10
s/div.)
V
OUT
50mV/div
I
OUT
1A/div
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1V
C
OUT
= 1
F
Features
Input Voltage Range:
V
IN
: 1.4V to 6.5V
V
BIAS
: 3.0V to 6.5V
Stable with 1
F 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
MIC49150
Micrel
MIC49150
2
January 2002
Pin Configuration
1
2
3
4
8
7
6
5
GND
GND
GND
GND
EN/ADJ.
VBIAS
VIN
VOUT
Power MSOP-8 (MM)
Pin Description
MIC49150
MIC49150
MSOP8
S-Pak
Pin Name
Pin Function
1
1
Enable
Enable (Input): CMOS compatible input. Logic high = enable, logic low =
shutdown
ADJ.
Adjustable regulator feedback input. Connect to resistor voltage divider.
3
4
VIN
Input voltage which supplies current to the output power device.
4
5
VOUT
Regulator Output
2
2
VBIAS
Input Bias Voltage for powering all circuitry on the regulator with the excep-
tion of the output power device.
5/6/7/8
3
GND
Ground (TAB is connected to ground on S-Pak)
TA
B
5 VOUT
4
VBIAS
3
2
VIN
1 EN/ADJ.
GND
5-Lead S-Pak (R)
Ordering Information
Part Number
Output Current
Voltage
Temperature Range
Package
MIC49150-0.9BMM
1.5A
0.9V
40
C to +125
C
Power MSOP-8
MIC49150-1.5BMM
1.5A
1.5V
40
C to +125
C
Power MSOP-8
MIC49150BMM
1.5A
ADJ.
40
C to +125
C
Power MSOP-8
MIC49150-0.9BR
1.5A
0.9V
40
C to +125
C
S-Pak-5
MIC49150-1.5BR
1.5A
1.5V
40
C to +125
C
S-Pak-5
MIC49150BR
1.5A
ADJ.
40
C to +125
C
S-Pak-5
Other voltages available. Contact Micrel for details.
January 2002
3
MIC49150
MIC49150
Micrel
Electrical Characteristics
T
A
= 25
C with V
BIAS
= V
OUT
+2.1V; V
IN
= V
OUT
+ 1V; bold values indicate 40
C < T
J
< +125
C, Note 4; unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Units
Output Voltage Accuracy
At 25
C
1
+1
%
Over temperature range
2
+2
%
Line Regulation
V
IN
= 3.0V to 6.5V
0.1
0.01
+0.1
%/V
Load Regulation
I
L
= 0mA to 1.5A
0.2
1
%
1.5
%
Dropout Voltage (V
IN
- V
OUT
)
I
L
= 750mA
130
200
mV
300
mV
I
L
= 1.5A
280
400
mV
500
mV
Dropout Voltage (V
BIAS
- V
OUT
)
I
L
= 750mA
1.3
V
Note 4
I
L
= 1.5A
1.65
1.9
V
2.1
V
Ground Pin Current, Note 5
I
L
= 0mA
15
mA
I
L
= 1.5A
15
25
mA
30
mA
Ground Pin Current in Shutdown
V
EN
0.6V, (I
BIAS
+ I
CC
), Note 6
0.5
1
A
2
A
Current thru V
BIAS
I
L
= 0mA
9
15
mA
25
mA
I
L
= 1.5A
32
mA
Current Limit
MIC49150
1.6
2.3
3.5
A
4
A
Enable Input, Note 6
Enable Input Threshold
Regulator enable
1.6
V
(Fixed Voltage only)
Regulator shutdown
0.6
V
Enable Pin Input Current
Independent of state
0.1
1
A
Reference
Reference Voltage
0.891
0.9
0.909
V
0.882
0.918
V
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4.
For V
OUT
1V, V
BIAS
dropout specification does not apply due to a minimum 3V V
BIAS
input.
Note 5.
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
.
Note 6.
Fixed output voltage versions only.
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) ....................................................... 8V
Bias Supply Voltage (V
BIAS
) ............................................ 8V
Enable Input Voltage (V
EN
) ............................................. 8V
Power Dissipation .................................... Internally Limited
ESD Rating, Note 3 ...................................................... 2kV
Operating Ratings
(Note 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 V
IN
Junction Temperature Range ............. 40
C
T
J
+125
C
Package Thermal Resistance
MSOP-8
(
JA
) ...................................................... 80
C/W
S-PAK
(
JC
) ............................................................ 2
C/W
January 2002
5
MIC49150
MIC49150
Micrel
0
10
20
30
40
50
60
70
80
0.01
0.1
1
10
100
1000
PSRR (dB)
FREQUENCY (kHz)
Power Supply Rejection Ratio
(Input Supply)
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1.0V
I
OUT
= 1.5A
C
OUT
= 1
F ceramic
0
10
20
30
40
50
60
70
80
0.01
0.1
1
10
100
1000
PSRR (dB)
FREQUENCY (kHz)
Power Supply Rejection Ratio
(Bias Supply)
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1.0V
I
OUT
= 1.5A
C
OUT
= 1
F ceramic
0
50
100
150
200
250
300
0
200
400
600
800
1000
1200
1400
1600
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
(Input Supply)
V
BIAS
= 5V
V
OUT
= 1.0V
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
200
400
600
800
1000
1200
1400
1600
DROPOUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Dropout Voltage
(Bias Supply)
V
IN
= 2.5V
V
OUT
= 1.5V
0
50
100
150
200
250
300
350
400
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE(
C)
Dropout Voltage
vs. Temperature
(Input Supply)
V
BIAS
= 5V
I
OUT
= 1.5A
V
OUT
= 1.5V
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (V)
TEMPERATURE(
C)
Dropout Voltage
vs. Temperature
(Bias Supply)
V
IN
= 2.5V
I
OUT
= 1.5A
V
OUT
= 1.5V
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0.5
1
1.5
2
2.5
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout Characteristics
(Input Voltage)
V
BIAS
= 5V
V
OUT
= 1.5V
I
OUT
= 10mA
I
OUT
= 1.5A
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
1
2
3
4
5
6
7
OUTPUT VOLTAGE (V)
BIAS VOLTAGE (V)
Dropout Characteristics
(Bias Voltage)
V
IN
= 2.5V
V
OUT
= 1.5V
I
OUT
= 10mA
I
OUT
= 1.5A
1.495
1.496
1.497
1.498
1.499
1.500
1.501
1.502
1.503
1.504
1.505
0
200
400
600
800
1000
1200
1400
1600
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Load Regulation
V
BIAS
= 5V
V
IN
= 2.5V
0
50
100
150
200
250
300
3
3.5
4
4.5
5
5.5
6
6.5
BIAS CURRENT (mA)
BIAS VOLTAGE (V)
Maximum Bias Current
vs. Bias Voltage
V
ADJ
= 0V
I
OUT
= 1.5A
V
IN
= 2.5V
*Note: Maximum bias current is bias
current with input in dropout
0
50
100
150
200
250
300
-40 -20 0
20 40 60 80 100 120
BIAS CURRENT (mA)
TEMPERATURE(
C)
Maximum Bias Current
vs. Temperature
V
BIAS
= 5V
V
ADJ
= 0V
V
IN
= 2.5V
0
5
10
15
20
25
30
35
40
45
-40 -20 0
20 40 60 80 100 120
BIAS CURRENT (mA)
TEMPERATURE (
C)
Bias Current
vs. Temperature
V
IN
= 2.5V
V
OUT
= 1.5V
V
BIAS
= 5V
I
OUT
= 10mA
I
OUT
= 1500mA
I
OUT
= 100mA
I
OUT
= 750mA
Typical Characteristics
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