MIC47050
500mA ULDO™ with Low Input
and Low Output Voltage
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
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 1µF 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
Micrel, Inc. MIC47050
April 2012 2M9999-040312-B
Ordering Information
Part Number Voltage (1) Marking
Code(2)
Temperature
Range Package Lead
Finish(3)
MIC47050-1.2YML(4) 1.2 4GZ 40C to 125C 6-Pin 2mm x 2mm MLF® Pb-Free
MIC47050-1.8YML(4) 1.8 GGZ 40C to 125C 6-Pin 2mm x 2mm MLF® Pb-Free
MIC47050YML(4) ADJ AGZ 40C to 125C 6-Pin 2mm x 2mm MLF® Pb-Free
MIC47050-1.2YMT(5)(6) 1.2 ZG4 40C to 125C 6-Pin 2mm x 2mm Thin MLF® Pb-Free
MIC47050-1.8YMT(5)(6) 1.8 ZGG 40C to 125C 6-Pin 2mm x 2mm Thin MLF® Pb-Free
MIC47050YMT(5) ADJ ZGA
40C to 125C 6-Pin 2mm x 2mm Thin MLF® Pb-Free
Notes:
1. Other voltage available. Contact Micrel Marketing for details.
2. Overbar ( ¯ ) may not be to scale.
3. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
4. MLF® (ML) package (Pin 1 identified = ).
5. Thin MLF® (MT) package (Pin 1 identified = ).
6. 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)
Micrel, Inc. MIC47050
April 2012 3M9999-040312-B
Pin Description
Fixed ADJ Pin Name Pin Function
1 1 BIAS
Bias Supply. The bias supply is the power supply for the internal circuitry of the
regulator.
2 2 GND Ground. Ground pins and exposed pad must be connected externally.
3 3 IN
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.
4 4 OUT Output. Output Voltage of Regulator.
5 – PGOOD
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.
– 5 ADJ Adjust Input. Connect external resistor divider to program the output voltage.
6 6 EN
Enable: TTL/CMOS compatible input. Logic high = enable, logic low = shutdown. Do
not leave floating.
EP EP GND Exposed thermal pad. Connect to the ground plane to maximize thermal performance.
Micrel, Inc. MIC47050
April 2012 4M9999-040312-B
Absolute Maximum Ratings(1)
IN Supply Voltage (VIN) ................................... –0.3V to +4V
Bias Supply Voltage (VBIAS)............................. –0.3V to +6V
Enable Voltage (VEN)....................................... –0.3V to +6V
Power Good Voltage (VPGOOD) ....................... .–0.3V to +6V
ADJ Pin Voltage (VADJ)................................... .–0.3V to +6V
OUT Pin Voltage (VOUT) ....................................–0.3V to VIN
Lead Temperature (soldering,10 sec.)....................... 260C
Storage Temperature (TS).........................–65C to +150C
ESD Rating(3).........................................................2kV HBM
Operating Ratings(2)
IN Supply Voltage (VIN) ............+1.0V to +3.6V (VIN < VBIAS)
Bias Voltage (VBIAS)...................................... +2.3V to +5.5V
Enable Voltage (VEN)........................................... 0V to VBIAS
Power Good Voltage (VPGOOD) ........................... .0V to VBIAS
Output Voltage Range …………….. ................ 0.4V to 2.0V
Junction Temperature (TJ) ........................–40°C to +125°C
Ambient Temperature (TA) ..........................–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)
VIN = VOUT + 0.5V; VBIAS = VOUT+2.1V; COUT = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C TJ +125°C, unless noted.
Parameter Condition Min. Typ. Max. Units
Input Supply
Input Voltage Range (VIN) 1.0 3.6 V
VIN UVLO Threshold(5) V
IN Rising 0.7 0.85 1.0 V
VIN UVLO Hysteresis 40 mV
Ground Current in Shutdown (IGND) VEN 0.2V (Regulator Shutdown) 0.1 1.0 A
Ground Current (IGND) IOUT = 500mA; VIN = VOUT + 0.5V 6 15 A
Bias Supply
BIAS Input Voltage (VBIAS) 2.3 5.5 V
VBIAS UVLO Threshold(5) V
BIAS Rising 1.7 2.1 2.3 V
VBIAS UVLO Hysteresis 75 mV
Dropout voltage (VBIAS - VOUT) IOUT = 100mA
IOUT = 500mA 1.15
1.25
2.1
V
V
VBIAS Supply Current (IBIAS) IOUT = 1mA; VBIAS = VOUT + 2.1V 330 500 A
VBIAS Supply Current in Shutdown (IBIAS) VEN 0.2V (Regulator Shutdown) 0.1 1.0 A
Output Voltage
Dropout voltage
(VIN - VOUT)
IOUT = 100mA
IOUT = 500mA 9
44
50
120
mV
mV
Output Voltage Accuracy IOUT = 100A
IOUT = 100A
-1.5
-2.0 +1.5
+2.0
%
%
VBIAS Line Regulation VBIAS = VOUT + 2.1V to 5.5V -0.1 0.015 0.1 %/V
Micrel, Inc. MIC47050
April 2012 5M9999-040312-B
Electrical Characteristics(4)
VIN = VOUT + 0.5V; VBIAS = VOUT+2.1V; COUT = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C TJ +125°C, unless noted.
Parameter Condition Min. Typ. Max. Units
VIN Line Regulation VIN = VOUT + 0.5V to 3.6V -0.05 0.005 0.05 %/V
Load Regulation IOUT = 10mA to 500mA 0.2 0.5 %
Current Limit
Short Circuit Current Limit VIN = 2.7V; VOUT = 0V 0.6 1.6 2.5 A
Enable Input
EN Logic Level High 1.0 0.77 V
EN Logic Level Low 0.67 0.2 V
EN Hysteresis 100 mV
Enable Bias Current VEN 0.2V (Regulator Shutdown)
VEN = 1.0V (Regulator Enabled) 1
6
2
10
A
A
Turn-on Time COUT = 1F; 90% of typical VOUT 15 500 s
Thermal Protection
Over-Temperature Shutdown TJ Rising 160 C
Over-Temperature Shutdown Hysteresis 20 C
Power Good
95
Power Good Threshold Voltage VOUT Rising
VOUT Falling
85
91
89
%
%
Power Good Hysteresis 2 %
Power Good Output Low Voltage IPG = 250A 0.02 0.1 V
Power Good Leakage Current VPG = 5.0V -1 0.01 +1 A
Reference Voltage (Adjustable Option Only)
Feedback Reference Voltage IOUT = 100A
IOUT = 100A
0.394
0.392 0.4 0.406
0.408
V
V
FB Bias Current VFB = 0.8V 20 nA
Output Voltage Noise and Ripple Rejection
Output Voltage Noise f = 10Hz to 100kHz; IOUT = 100mA; COUT=1F 63
VRMS
Ripple Rejection f = 10kHz; COUT = 1.0F, IOUT = 100mA
f = 100kHz; COUT = 1.0F, IOUT = 100mA 50
37 dB
dB
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, 1.5k 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.
Micrel, Inc. MIC47050
April 2012 6M9999-040312-B
Typical Characteristics
Output Voltage vs.
Input Voltage
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
01234
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
V
BIAS
= 5.0V
V
OUT
= 1.8V
I
OUT
= 500mA
Input Dropout Voltage vs.
Output Current
0
5
10
15
20
25
30
35
40
45
50
0 100 200 300 400 500
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV
)
V
BIAS
= 5.0V
V
OUT
= 1.2V
Input Dropout Voltage vs.
Temperature
0
10
20
30
40
50
60
70
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
DROPOUT VOLTAGE (mV
)
I
OUT
= 500mA
I
OUT
= 100mA
V
BIAS
= 3.6V
V
OUT
= 1.2V
Output Voltage vs.
Bias Voltage
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2345
BIAS VOLTAGE (V)
OUTPUT VOLTAGE (V)
V
IN
= 2.5V
V
OUT
= 1.8
V
I
OUT
= 500mA
I
OUT
= 100mA
Bias Dropout Voltage vs.
Output Current
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 100 200 300 400 500
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (V)
V
OUT
= 2.0V
V
IN
= 2.5V
V
OUT
= 1.2V
Bias Dropout Voltage vs.
Temperature
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
DROPOUT VOLTAGE (V)
V
IN
= 2.5V
I
OUT
= 500mA
V
OUT
= 2.0V
V
OUT
= 1.2V
Bias Current vs.
Bias Voltage
240
260
280
300
320
340
360
380
400
420
440
33.544.555.5
B I AS VO LT AG E ( V)
BIAS CURRENT (µA
)
V
IN
= 1.8V
I
OUT
= 1mA
Bias Current vs.
Output Current
320
322
324
326
328
330
332
334
336
338
340
0 100 200 300 400 500
OUTPUT CURRENT (mA)
BIAS CURRENT (µA
)
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
Bias Current vs.
Temperature
240
260
280
300
320
340
360
380
400
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
BIAS CURRENT (µA
)
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
Micrel, Inc. MIC47050
April 2012 7M9999-040312-B
Typical Characteristics (Continued)
Ground Current vs.
Input Voltage
0
5
10
15
20
25
30
1.2 1.6 2 2.4 2.8 3.2 3.6
INPUT VOLTAGE (V)
GROUND CURRENT (µA)
V
BIAS
= 5.0V
V
OUT
= 1.2V
I
OUT
= 500mA
Ground Current vs.
Temperature
4.00
4.25
4.50
4.75
5.00
5.25
5.50
5.75
6.00
6.25
6.50
6.75
7.00
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
GROUND CURRENT (µA)
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
I
OUT
= 500mA
Output Voltage vs.
Output Current
1.190
1.192
1.194
1.196
1.198
1.200
1.202
1.204
1.206
1.208
0 100 200 300 400 500
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
BIAS
= 3.6V
V
IN
= 1.8V
Current Limit vs.
Input Voltage
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.5 2 2.5 3 3.5 4
INPUT VOLTAGE (V)
CURRENT LIMIT (A)
VBIAS = 5.0V
VOUT = 1.2V
Current Limit vs.
Temperature
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
CURRENT LIMIT (A)
VBIAS = 3.6V
VIN = 1.8V
VOUT = 1.2V
Output Voltage vs.
Temperature
1.180
1.185
1.190
1.195
1.200
1.205
1.210
1.215
1.220
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
VBIAS = 3.6V
VIN = 1.8V
IOUT = 100µA
Power Supply Ripple Rejection
(Input Voltage)
0
10
20
30
40
50
60
70
80
90
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
BIAS
= 3.6V
V
IN
= 1.8V ± 300mV
V
OUT
= 1.2V
I
OUT
= 500mA
Power Supply Ripple Rejection
(Bias Voltage)
0
10
20
30
40
50
60
70
80
90
0.01 0.1 1 10 100 1000
Frequency (kHz)
PSRR (dB)
V
BIAS
= 3.6V ± 300mV
V
IN
= 1.8V
V
OUT
= 1.2V
I
OUT
= 500mA
Output Noise
0.001
0.01
0.1
1
10
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
OUTPUT NOISE (µV/√Hz)
V
BIAS
= 3.6V
V
IN
= 1.8V
V
OUT
= 1.2V
Noise (10Hz-100kHz) = 56.19µV
RMS
Micrel, Inc. MIC47050
April 2012 8M9999-040312-B
Functional Characteristics
Micrel, Inc. MIC47050
April 2012 9M9999-040312-B
Functional Diagram
MIC47050 Fixed Output Block Diagram
MIC47050 Adjustable Output Block Diagram
Micrel, Inc. MIC47050
April 2012 10 M9999-040312-B
Functional 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 0.5A of output current while only
requiring a 1µF ceramic output capacitor for stability.
The MIC47050 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bias Supply Voltage
VBIAS, requiring relatively light current, provides power to
the control portion of the MIC47050. Bypassing on the
bias pin is recommended to improve performance of the
regulator during line and load transients. Small 0.1µF
ceramic capacitors from VBIAS-to-ground help reduce
high frequency noise from being injected into the control
circuitry from the bias rail and are good design practice.
Input Supply Voltage
VIN provides the supply to power the LDO. The minimum
input voltage is 1.0V. This allows conversion from low
voltage supplies to reduce the power dissipation in the
pass element.
Input Capacitor
The MIC47050 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1µF capacitor is the
minimum required for stability. A 10µF ceramic capacitor
is recommended for most applications, especially if the
LDO’s headroom (VIN –VOUT) is small and/or large load
transients are present. Fast load transient and low
headroom requires a larger input filter capacitor to
ensure that the regulator does not drop out of regulation.
A 10µF will better attenuate any voltage glitches from
exceeding the maximum voltage rating of the part.
Additional high-frequency capacitors, such as small-
valued NPO dielectric-type capacitors, help filter out
high-frequency noise and are good practice in any RF-
based circuit.
X7R and X5R dielectric ceramic capacitors are
recommended because of their temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors are not recommended since
they change value by as much as 50% and 60%
respectively over their operating temperature ranges. To
use a ceramic-chip capacitor with Y5V dielectric, the
value must be much higher than an X7R ceramic or a
tantalum capacitor to ensure the same capacitance
value over the operating temperature range.
Tantalum capacitors have a very stable dielectric (10%
over their operating temperature range) and can also be
used with this device. See the Typical Characteristic
section for examples of load transient response.
Output Capacitor
The MIC47050 requires an output capacitor of 1µF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High-ESR
capacitors may cause high-frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 1µF ceramic output capacitor and
does not improve significantly with larger capacitance.
The output capacitor type and placement criteria are the
same as the input capacitor. See the “Input Capacitor”
subsection for a detailed description.
Minimum Load Current
The MIC47050, unlike most other regulators, does not
require a minimum load to maintain output voltage
regulation.
Adjustable Regulator Design
The MIC47050 adjustable version allows programming
the output voltage from 0.4V to 2.0V. Two external
resistors are required. The R1 resistor value between
VOUT and the ADJ pin should not exceed 10k, as larger
values can cause instability. R2 connects between the
ADJ pin and ground. The resistor values are calculated
as follows:
1
REF
V
OUT
V
R2R1
Where VOUT is the desired output voltage and VREF is the
internal reference voltage.
Enable/Shutdown
The MIC47050 comes with a single active-high enable
pin that allows the regulator to be disabled. Forcing the
enable pin low disables the regulator and sends it into a
“zero” off-mode-current state. In this state, current
consumed by the regulator goes nearly to zero. Forcing
the enable pin high enables the output voltage. The
active-high enable pin uses CMOS technology and the
enable pin cannot be left floating; a floating enable pin
may cause an indeterminate state on the output.
Micrel, Inc. MIC47050
April 2012 11 M9999-040312-B
Power Good (PGOOD)
The Power Good (PGOOD) pin is an open drain output
that goes low when the output voltage (fixed version)
drops below the PGOOD threshold voltage.
The pull-up resistor value should be large enough to
guarantee a proper “low” voltage when the PGOOD pin
pulls low. The PGOOD low voltage is typically 0.1V at
250µA current. A 10k resistor or greater is
recommended when pulling up to 3.3V bias.
If the PGOOD function is not required, the PGOOD pin
may be left unconnected.
Thermal Shutdown
The MIC47050 has an internal over-temperature
protection feature. This feature is for protection only.
The device should never be intentionally operated near
this temperature as this may reduce long term reliability.
The device will turn off when the over-temperature
threshold is exceeded. A 20°C hysteresis is built in to
allow the device to cool before turning back on.
Thermal Considerations
The MIC47050 is designed to provide 0.5A of continuous
current in a very small package. Maximum ambient
operating temperature can be calculated based on the
output current and the voltage drop across the part.
Given that the input voltage is 1.8V, the output voltage is
1.2V and the output current is 0.5A. The actual power
dissipation of the regulator circuit can be determined
using the equation:
BIAS
I
BIAS
V
GND
I
IN
V
OUT
I
OUT
V
IN
V
D
P
Because this device is CMOS, the ground current is
insignificant for power dissipation and can be ignored for
this calculation.
0.3W0.5A1.2V1.8V
D
P
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
JA
A
T
J(MAX)
T
D(MAX)
P
TJ(MAX) = 125°C, the maximum junction temperature of
the die.
JA thermal resistance = 90°C/W.
Table 1 shows junction-to-ambient thermal resistance for
the MIC47050 in the MLF® or Thin MLF® package.
Package θJA Recommended
Min. Footprint θJC
6-pin 2mm x 2mm MLF® 90°C/W 45°C/W
6-pin 2mm x 2mm
Thin MLF® 90°C/W 45°C/W
Table 1. Thermal Resistance
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-to-
ambient thermal resistance for the minimum footprint is
90°C/W. The maximum power dissipation must not be
exceeded for proper operation. For example, when
operating the MIC47050-1.2YML at an input voltage of
1.8V and a 0.5A load with a minimum footprint layout,
the maximum ambient operating temperature TA can be
determined as follows:
C98
A
T
0.3WC/W90C125
A
T
D(MAX)
P
JA
J(MAX)
T
A
T
Therefore, a 1.2V application with 0.5A of output current
can accept an ambient operating temperature of 98°C in
a 2mm x 2mm MLF® or Thin MLF® package.
Thermal Measurements
Measuring the IC’s case temperature is recommended to
insure it is within its operating limits. Although this might
seem like a very elementary task, it is easy to get
erroneous results. The most common mistake is to use
the standard thermal couple that comes with a thermal
meter. This thermal couple wire gauge is large, typically
22 gauge, and behaves like a heatsink, resulting in a
lower case measurement.
Two methods of temperature measurement are using a
smaller thermal couple wire or an infrared thermometer.
If a thermal couple wire is used, it must be constructed
of 36 gauge wire or higher (smaller wire size) to
minimize the wire heat-sinking effect.
Micrel, Inc. MIC47050
April 2012 12 M9999-040312-B
In addition, the thermal couple tip must be covered in
either thermal grease or thermal glue to make sure that
the thermal couple junction is making good contact with
the case of the IC. Omega brand thermal couple (5SC-
TT-K-36-36) is adequate for most applications.
Wherever possible, an infrared thermometer is
recommended. The measurement spot size of most
infrared thermometers is too large for an accurate
reading on a small form factor ICs. However, a IR
thermometer from Optris has a 1mm spot size, which
makes it a good choice for the 2mm x 2mm MLF® or
Thin MLF® package. An optional stand makes it easy to
hold the beam on the IC for long periods of time.
For a full discussion of heat sinking and thermal effects
of voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s Designing with Low-Dropout Voltage
Regulators handbook. This information can be found on
Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Micrel, Inc. MIC47050
April 2012 13 M9999-040312-B
MIC47050 Typical Application Schematic
MIC47050 Adjustable Output
MIC47050 Fixed Output
Micrel, Inc. MIC47050
April 2012 14 M9999-040312-B
MIC47050 Bill of Materials
Item Part Number Manufacturer Description Qty.
GRM21BR60J106ME19 Murata(1) Ceramic Capacitor, 10µF, 6.3V, X5R, 0603 size
C1 C1608X5R0J106MT TDK(2) Ceramic Capacitor, 10µF, 6.3V, X5R, 0603 size 1
GRM155R61A105KE15D Murata(1) Capacitor, 1µF, 10V, X5R, 0402 size
C2 C1005X5R0J105KT TDK(2) Capacitor, 1µF, 10V, X5R, 0402 size 1
C3 06035D104MAT2A AVX(3) Ceramic Capacitor, 0.1µF, 50V, X5R, 0603 size 1
R1 CRCW06031001FRT1 Vishay Dale(4) Resistor, 1k (0603 size), 1% 1
R2 CRCW06036650FRT1 Vishay Dale(4) Resistor, 665 (0603 size), 1% 1
R3 CRCW06031002FRT1 Vishay Dale(4) Resistor, 10k (0603 size), 1% 1
MIC47050YML Low Input and Output 500mA ULDO™ - Adjustable Output
MIC47050YMT Low Input and Output 500mA ULDO™ - Adjustable Output
MIC47050-1.2YML Low Input and Output 500mA ULDO™ - Fixed 1.2V Output
MIC47050-1.2YMT Low Input and Output 500mA ULDO™ - Fixed 1.2V Output
MIC47050-1.8YML Low Input and Output 500mA ULDO™ - Fixed 1.8V Output
U1
MIC47050-1.8YMT
Micrel, Inc.(5)
Low Input and Output 500mA ULDO™ - Fixed 1.8V Output
1
Notes:
1. Murata: www.murata.com.
2. TDK: www.tdk.com.
3. AVX: www.avx.com.
4. Vishay: www.vishay.com .
5. Micrel, Inc.: www.micrel.com.
Micrel, Inc. MIC47050
April 2012 15 M9999-040312-B
Package Information
6-Pin 2mm 2mm Thin MLF® (MT)
Micrel, Inc. MIC47050
April 2012 16 M9999-040312-B
Package Information (Continued)
6-Pin 2mm x 2mm MLF® (ML)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2012 Micrel, Incorporated.
