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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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
V
IN
= 1.8V
V
BIAS
= 3.3V
C
BIAS
= 1µF
Ceramic
C
IN
= 1µF
Ceramic
MIC49150BR
IN
OUT
BIAS
ADJ
R2 C
OUT
= 1µF
Ceramic
V
OUT
= 1.0V
R1
GND
Low Voltage,
Fast Transient Response Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2006
1
M9999-111306
Micrel, Inc.
MIC49150
Ordering Information
Part Number
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*
Output
Current
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
Voltage
0.9V
1.2V
1.5V
1.8V
Adj.
0.9V
1.2V
1.5V
1.8V
Adj.
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
8-Pin Power MSOP
8-Pin Power MSOP
8-Pin Power MSOP
8-Pin Power MSOP
8-Pin Power MSOP
5-Pin S-PAK
5-Pin S-PAK
5-Pin S-PAK
5-Pin S-PAK
5-Pin S-PAK
* RoHS Compliant with ‘high-melting solder’ exemption.
Pin Configuration
EN/ADJ. 1
VBIAS 2
VIN 3
VOUT 4
8 GND
TAB
7 GND
6 GND
5 GND
5
4
3
2
1
VOUT
VIN
GND
VBIAS
EN/ADJ.
8-Pin Power MSPO (MM)
5-Pin S-Pak (R)
Pin Description
Pin Number
8-MSOP
1
Pin Number
5-SPak
1
Pin Name
EN
ADJ
Pin Name
Enable (Input): CMOS compatible input. Logic high = enable,
logic low = shutdown.
Adjustable regulator feedback input. Connect to resistor
voltage divider.
Input Bias Voltage for powering all circuitry on the regulator
with the exception of the output power device.
Input voltage which supplies current to the output power
device.
Regulator Output.
Ground (TAB is connected to ground on S-Pak).
2
3
4
5/6/7/8
2
4
5
3
VBIAS
VIN
OUT
GND
November 2006
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M9999-111306
Micrel, Inc.
MIC49150
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)
.................................................................. 4kV
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 (T
J
) ..................–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)
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, unless noted
(5)
.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage (V
IN
- V
OUT
)
Condition
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
Min
–1
–2
Typ
Max
+1
+2
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
0.01
0.2
130
280
1.3
1.65
15
15
0.5
9
32
+0.1
1
1.5
200
300
400
500
1.9
2.1
25
30
1
2
15
25
3.4
4
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
Ground Pin Current in
Shutdown
Current thru V
BIAS
Current Limit
MIC49150
1.6
2.3
Enable Input (Note 7)
Enable Input Threshold
(Fixed Voltage only)
Enable Pin Input Current
Regulator enable
Regulator shutdown
Independent of state
0.891
0.882
1.6
0.6
0.1
0.9
1
0.909
0.918
Reference
Reference Voltage
Notes:
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, 1.5kΩ 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.
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
.
7. Fixed output voltage versions only.
November 2006
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M9999-111306
Micrel, Inc.
MIC49150
Typical Characteristics
80
70
60
PSRR (dB)
PSRR (dB)
50
40
30
20
10
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1.0V
I
OUT
= 1.5A
C
OUT
= 1µF ceramic
0.1
1
10
100
FREQUENCY (kHz)
1000
Power Supply Rejection Ratio
(Input Suppl )
80
70
60
50
40
30
20
10
Power Supply Rejection Ratio
(Bias Suppl )
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
200
Dropout Voltage
(Input Suppl )
1000
1200
1400
0.1
1
10
100
FREQUENCY (kHz)
1000
OUTPUT CURRENT (mA)
1.8
DROPOUT VOLTAGE (V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
200
0
Dropout Voltage
(Bias Supply)
400
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
Dropout Voltage
vs. Temperature
(Input Supply)
DROPOUT VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
Dropout Voltage
vs. Temperature
(Bias Supply)
V
IN
= 2.5V
V
OUT
= 1.5V
1000
1200
1400
1600
400
600
800
V
BIAS
= 5V
I
OUT
= 1.5A
V
OUT
= 1. 5V
OUTPUT CURRENT (mA)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE(°C)
0.2
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE(°C)
V
IN
= 2.5V
I
OUT
= 1.5A
V
OUT
= 1.5V
1.6
OUTPUT VOLTAGE (V)
1.4
1.2
1.0
0.8
0.6
0.4
Dropout Characteristics
(Input Voltage)
OUTPUT VOLTAGE (V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Dropout Characteristics
(Bias Voltage)
OUTPUT VOLTAGE (V)
1.505
1.504
1.503
1.502
1.501
1.500
1.499
1.498
1.497
1.496
0
200
1.495
Load Regulation
I
OUT
= 10mA
I
OUT
= 10mA
I
OUT
= 1.5A
I
OUT
= 1.5A
1000
1200
1400
0
0
0.5
1
1.5
2
INPUT VOLTAGE (V)
2.5
1
2
3
4
5
6
BIAS VOLTAGE (V)
7
OUTPUT CURRENT (mA)
300
BIAS CURRENT (mA)
250
200
150
100
50
0
3
Maximum Bias Current
vs. Bias Voltage
300
BIAS CURRENT (mA)
250
200
150
100
50
Maximum Bias Current
vs. Temperature
45
40
BIAS CURRENT (mA)
35
Bias Current
vs. Temperature
V
IN
= 2.5V
V
OUT
= 1.5V
V
BIAS
= 5V
I
= 1500mA
V
ADJ
= 0V
I
OUT
= 1.5A
V
IN
= 2.5V
V
BIAS
= 5V
V
ADJ
= 0V
V
IN
= 2.5V
30 I
= 750mA
OUT
25
20
15
10
5
I
OUT
= 100mA
OUT
*Note: Maximum bias current is bias
current with input in dropout
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE(
°C)
I
= 10mA
OUT
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
November 2006
4
M9999-111306
1600
400
600
800
V
BIAS
= 5V
0.2 V
OUT
= 1.5V
V
IN
= 2.5V
V
OUT
= 1.5V
V
BIAS
= 5V
V
IN
= 2.5V
1600
0
0.01
0
0.01
V
BIAS
= 3.3V
V
IN
= 1.8V
V
OUT
= 1.0V
I
OUT
= 1.5A
C
OUT
= 1µF ceramic
V
BIAS
= 5V
V
OUT
= 1.0V
400
600
800
0
Micrel, Inc.
MIC49150
Typical Characteristics (cont.)
50
40
CURRENT (mA)
30
20
10
0
Bias Current
vs. Output Current
GROUND CURRENT (mA)
V
BIAS
= 5V
V
IN
= 2.5V
V
OUT
= 1.5V
I
BIAS
14
12
10
8
6
4
2
0
3
3.5
Ground Current
vs. Bias Voltage
GROUND CURRENT (mA)
14
12
10
8
6
4
2
0
3
Bias Current
vs. Bias Voltage
I
BIAS
I
OUT
= 0mA
V
IN
= 2.5V
V
OUT
= 1.5V
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
I
OUT
= 100mA
V
IN
= 2.5V
V
OUT
= 1.5V
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
0
1000
1200
1400
OUTPUT CURRENT (mA)
50
GROUND CURRENT (mA)
40
30
20
10
0
Bias Current
vs. Bias Voltage
GROUND CURRENT (mA)
I
OUT
= 750mA
V
IN
= 2.5V
V
OUT
= 1.5V
I
BIAS
1600
200
400
600
800
50
40
30
20
10
0
Bias Current
vs. Bias Voltage
I
BIAS
I
OUT
= 1500mA
V
IN
= 2.5V
V
OUT
= 1.5V
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
3
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
3
20
18 V
BIAS
= 5V
16 V
OUT
= 1.5V
I
OUT
= 100mA
14
12
10
8
I
OUT
= 0mA
6
4
2
0
0
0.5
1
1.5
2
2.5
INPUT VOLTAGE (V)
Bias Current
vs. Input Voltage
BIAS CURRENT (mA)
300
BIAS CURRENT (mA)
Bias Current
vs. Input Voltage
1500mA
REFERENCE VOLTAGE (V)
0.901
Reference Voltage
vs. Input Voltage
REFERENCE VOLTAGE (V)
V
BIAS
= 5V
0.901
Reference Voltage
vs. Bias Voltage
V
IN
= 2.5V
V
BIAS
= 5V
250 V
OUT
= 1.5V
200
150
100
50
0
0
750mA
0.900
0.900
0.5
1
1.5
2
INPUT VOLTAGE (V)
2.5
0.899
1.4
2.4
3.4
4.4
5.4
INPUT VOLTAGE (V)
6.4
0.899
3
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
OUTPUT VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
V
BIAS
= 5V
V
IN
= 2.5V
V
OUT
= 0V
ENABLE THRESHOLD (V)
V
BIAS
= 5V
1.54
V
IN
= 2.5V
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
SHORT CIRCUIT CURRENT (A)
1.55
Output Voltage
vs. Temperature
3.0
Short Circuit Current
vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3
Enable Threshold
vs. Bias Voltage
ON
OFF
V
IN
= 2.5V
3.5
4 4.5 5 5.5 6
BIAS VOLTAGE (V)
6.5
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
November 2006
5
M9999-111306
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