MIC47050
500mA ULDO™ with Low Input
and Low Output Voltage
General Description
The MIC47050 is a high-speed, ultra-low dropout, dual-
supply NMOS ULDO™ designed to take advantage of
point-of-load applications that use multiple supply rails to
generate a low-voltage, high-current power supply. The
MIC47050 can source 500mA of output current while only
requiring a 1
µ
F ceramic output capacitor for stability. A
1.5% output voltage accuracy, low dropout voltage (44mV
@ 500mA), and low ground current makes this device
ideally suited for mobile and point-of-load applications.
The MIC47050 has an NMOS output stage offering very
low output impedance. The NMOS output stage makes for
a unique ability to respond very quickly to sudden load
changes such as that required by a microprocessor, DSP
or FPGA. The MIC47050 consumes little quiescent current
and therefore can be used for driving the core voltages of
mobile processors, post regulating a core DC/DC
converter in any processor.
The MIC47050 is available in fixed and adjustable output
voltages in the tiny 2mm x 2mm MLF
®
and Thin MLF
®
packages with an operating junction temperature range of
40C
to
125C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
Voltage range
– Input Voltage: 1.0V to 3.6V
– Bias Voltage: 2.3V to 5.5V
0.4V to 2.0V output voltage range
Low dropout voltage of 44mV at 500mA
±1.5% initial output voltage accuracy
High bandwidth – very fast transient response
Stable with a 1µF ceramic output capacitor
Logic level enable input
UVLO on both supply voltages
Available in thermally-enhanced 2mm x 2mm MLF
®
and
Thin MLF
®
packages
Junction temperature range of –40C to +125C
Applications
Point-of-load applications
PDAs, notebooks, and desktops
Datacom and telecom systems
DSP, PLD and FPGA power supply
Low-voltage post regulation
_________________________________________________________________________________________________________________________
Typical Application
ULDO is a trademark of Micrel Inc.
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
April 2012
M9999-040312-B
Micrel, Inc.
MIC47050
Ordering Information
Part Number
MIC47050-1.2YML
(4)
Voltage
(1)
1.2
Marking
Code
(2)
Temperature
Range
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
Package
Lead
Finish
(3)
Z G4
6-Pin 2mm x 2mm MLF
®
Pb-Free
MIC47050-1.8YML
(4)
1.8
Z GG
Z GA
ZG4
ZGG
ZGA
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm MLF
®
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
MIC47050YML
(4)
MIC47050-1.2YMT
(5)(6)
MIC47050-1.8YMT
(5)(6)
MIC47050YMT
(5)
Notes:
1.
2.
3.
4.
5.
6.
ADJ
1.2
1.8
ADJ
Other voltage available. Contact Micrel Marketing for details.
Overbar ( ¯ ) may not be to scale.
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
MLF (ML) package (Pin 1 identified =
■).
Thin MLF (MT) package (Pin 1 identified =
▲).
Contact factory for availability.
®
®
®
Pin Configuration
6-pin 2mm x 2mm MLF
®
- Fixed (ML)
6-pin 2mm x 2mm MLF
®
- Adjustable (ML)
6-pin 2mm x 2mm Thin MLF
®
- Fixed (MT)
6-pin 2mm x 2mm Thin MLF
®
- Adjustable (MT)
April 2012
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M9999-040312-B
Micrel, Inc.
MIC47050
Pin Description
Fixed
ADJ
Pin Name
Pin Function
1
2
3
4
5
–
6
EP
1
2
3
4
–
5
6
EP
BIAS
GND
IN
OUT
PGOOD
ADJ
EN
GND
Bias Supply. The bias supply is the power supply for the internal circuitry of the
regulator.
Ground. Ground pins and exposed pad must be connected externally.
Input Supply. Drain of NMOS pass transistor which is the power input voltage for
regulator. The NMOS pass transistor steps down this input voltage to create the
output voltage.
Output. Output Voltage of Regulator.
Power Good Output. Open-drain output. Output is driven low when the output voltage
is less than the power good threshold of its programmed nominal output voltage.
When the output goes above the power good threshold, the open-drain output goes
high-impedance, allowing it to be pulled up to a fixed voltage.
Adjust Input. Connect external resistor divider to program the output voltage.
Enable: TTL/CMOS compatible input. Logic high = enable, logic low = shutdown. Do
not leave floating.
Exposed thermal pad. Connect to the ground plane to maximize thermal performance.
April 2012
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M9999-040312-B
Micrel, Inc.
MIC47050
Absolute Maximum Ratings
(1)
IN Supply Voltage (V
IN
) ................................... –0.3V to +4V
Bias Supply Voltage (V
BIAS
)............................. –0.3V to +6V
Enable Voltage (V
EN
)....................................... –0.3V to +6V
Power Good Voltage (V
PGOOD
) ....................... .–0.3V to +6V
ADJ Pin Voltage (V
ADJ
)................................... .–0.3V to +6V
OUT Pin Voltage (V
OUT
) ................................... .–0.3V to V
IN
Lead Temperature (soldering,10 sec.)....................... 260C
Storage Temperature (T
S
).........................–65C to +150C
ESD Rating
(3)
......................................................... 2kV HBM
Operating Ratings
(2)
IN Supply Voltage (V
IN
) ............ +1.0V to +3.6V (V
IN
< V
BIAS
)
Bias Voltage (V
BIAS
)...................................... +2.3V to +5.5V
Enable Voltage (V
EN
)........................................... 0V to V
BIAS
Power Good Voltage (V
PGOOD
) ........................... .0V to V
BIAS
Output Voltage Range …………….. ................ 0.4V to 2.0V
Junction Temperature (T
J
) ........................ –40°C to +125°C
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
2mm x 2mm MLF
®
-6L (
JA
)................................90°C/W
2mm x 2mm MLF
®
-6L (
JC
)................................45°C/W
2mm x 2mm Thin MLF
®
-6L (
JA
)........................90°C/W
2mm x 2mm Thin MLF
®
-6L (
JC
) .......................45°C/W
Electrical Characteristics
(4)
V
IN
= V
OUT
+ 0.5V; V
BIAS
= V
OUT
+2.1V; C
OUT
= 1µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C≤ T
J
≤
+125°C, unless noted.
Parameter
Input Supply
Condition
Min.
1.0
Typ.
Max.
3.6
Units
Input Voltage Range (V
IN
)
V
IN
UVLO Threshold
(5)
V
IN
UVLO Hysteresis
Ground Current in Shutdown (I
GND
)
Ground Current (I
GND
)
Bias Supply
V
V
mV
A
A
V
IN
Rising
V
EN
≤
0.2V (Regulator Shutdown)
I
OUT
= 500mA; V
IN
= V
OUT
+ 0.5V
0.7
0.85
40
0.1
6
1.0
1.0
15
5.5
BIAS Input Voltage (V
BIAS
)
V
BIAS
UVLO Threshold
(5)
V
BIAS
UVLO Hysteresis
Dropout voltage (V
BIAS
- V
OUT
)
V
BIAS
Supply Current (I
BIAS
)
V
BIAS
Supply Current in Shutdown (I
BIAS
)
Output Voltage
2.3
V
V
mV
V
V
BIAS
Rising
I
OUT
= 100mA
I
OUT
= 500mA
I
OUT
= 1mA; V
BIAS
= V
OUT
+ 2.1V
V
EN
≤
0.2V (Regulator Shutdown)
1.7
2.1
75
1.15
1.25
330
0.1
2.3
2.1
500
1.0
V
A
A
Dropout voltage
(V
IN
- V
OUT
)
I
OUT
= 100mA
I
OUT
= 500mA
I
OUT
= 100
A
I
OUT
= 100
A
V
BIAS
= V
OUT
+ 2.1V to 5.5V
-1.5
-2.0
9
44
50
120
mV
mV
%
%
%/V
Output Voltage Accuracy
V
BIAS
Line Regulation
+1.5
+2.0
-0.1
0.015
0.1
April 2012
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M9999-040312-B
Micrel, Inc.
MIC47050
Electrical Characteristics
(4)
V
IN
= V
OUT
+ 0.5V; V
BIAS
= V
OUT
+2.1V; C
OUT
= 1µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C≤ T
J
≤
+125°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
V
IN
Line Regulation
Load Regulation
Current Limit
V
IN
= V
OUT
+ 0.5V to 3.6V
I
OUT
= 10mA to 500mA
V
IN
= 2.7V; V
OUT
= 0V
-0.05
0.005
0.2
0.05
0.5
2.5
%/V
%
A
V
Short Circuit Current Limit
Enable Input
0.6
1.0
1.6
0.77
0.67
100
EN Logic Level High
EN Logic Level Low
EN Hysteresis
Enable Bias Current
Turn-on Time
Thermal Protection
0.2
2
10
500
V
mV
A
A
s
C
C
V
EN
≤
0.2V (Regulator Shutdown)
V
EN
= 1.0V (Regulator Enabled)
C
OUT
= 1
F; 90% of typical V
OUT
T
J
Rising
1
6
15
160
20
Over-Temperature Shutdown
Over-Temperature Shutdown Hysteresis
Power Good
Power Good Threshold Voltage
Power Good Hysteresis
Power Good Output Low Voltage
Power Good Leakage Current
Reference Voltage (Adjustable Option Only)
V
OUT
Rising
V
OUT
Falling
I
PG
= 250
A
V
PG
= 5.0V
I
OUT
= 100
A
I
OUT
= 100
A
V
FB
= 0.8V
f = 10Hz to 100kHz; I
OUT
= 100mA; C
OUT
=1
F
f = 10kHz; C
OUT
= 1.0
F, I
OUT
= 100mA
f = 100kHz; C
OUT
= 1.0
F, I
OUT
= 100mA
-1
85
91
89
2
0.02
0.01
95
%
%
%
0.1
+1
V
A
Feedback Reference Voltage
FB Bias Current
Output Voltage Noise and Ripple Rejection
0.394
0.392
0.4
20
63
50
37
0.406
0.408
V
V
nA
V
RMS
Output Voltage Noise
Ripple Rejection
Notes:
dB
dB
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. Both VIN and VBIAS UVLO thresholds must be met for the output voltage to turn-on. If either of the two input voltages is below the UVLO thresholds,
the output is disabled.
April 2012
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M9999-040312-B
Analog electronics
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