MIC5501/2/3/4
Single 300mA LDO
in 1.0mm × 1.0mm DFN Package
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 20, 2015
Revision 2.3
General Description
The MIC5501/2/3/4 is an advanced general-purpose LDO
ideal for powering general-purpose portable devices. The
MIC5501/2/3/4 family of products provides a high-
performance 300mA LDO in an ultra-small 1mm × 1mm
package. The MIC5502 and MIC5504 LDOs include an
auto-dischar ge f eat ur e o n t he ou tput that is acti va ted when
the enabl e pin is low. T he MIC5503 a nd MIC5504 ha ve an
internal pull-down resistor on the enable pin that disables
the output w hen the enable pin is lef t floating. T his is ideal
for applications where the control signal is floating during
processor boot up.
Ideal for battery-powered applications, the MIC5501/2/3/4
offers 2% initial accuracy, low dropout voltage (160mV at
300mA), and low ground current (typically 38µA). The
MIC5501/2/3/4 can also be put into a zero-off-mode
current state, drawing virtually no current when disabled.
The MIC5501/2/3/4 has an operating junction tem perature
range of –40°C to 125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage range: 2.5V to 5.5V
• Fixed output voltages from 1.0V to 3.3V
• 300mA guaranteed output current
• High output accuracy (±2%)
• Low quiescent current: 38µA
• Stable with 1µF ceramic output capacitors
• Low dropout voltage: 160mV @ 300mA
• Output discharge circuit: MIC5502, MIC5504
• Internal enable pull-down: MIC5503, MIC 550 4
• Thermal-shutdown and current-limit protection
• 4-lead 1.0mm × 1.0mm Thin DFN package
• MIC5504 5-pin SOT23 package
Applications
• Smartphones
• DSC, GPS, PMP, and PDAs
• Medical devices
• Portable electronics
• 5V systems
___________________________________________________________________________________________________________
Typical Appli cation
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
2
Revision 2.3
Ordering Information
Part Number Marking
Code Output
Voltage(1) Auto-
Discharge EN
Pull-Down Temperature
Range Package(2,3)
MIC5501-3.3YMT
(4)
VS 3.3V NO NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5501-3.0YMT VP 3.0V NO NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5501-2.8YMT
(4)
VM 2.8V NO NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5501-1.8YMT
VG
1.8V
NO
NO
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5501-1.2YMT(4)
V4
1.2V
NO
NO
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5501-3.0YM5
VX
3.0V
NO
NO
–40°C to +125°C
5-Pin SOT23
MIC5502-3.3YMT(4)
XS
3.3V
YES
NO
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5502-3.0YMT
(4)
XP 3.0V YES NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5502-2.8YMT XM 2.8V YES NO –40°C to +125°C 4-Pin 1m m x 1mm Thin DFN
MIC5502-1.8YMT
XG
1.8V
YES
NO
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5502-1.2YMT(4)
X4
1.2V
YES
NO
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5503-3.3YMT(4)
SV
3.3V
NO
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5503-3.0YMT(4)
ZV
3.0V
NO
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5503-2.8YMT
(4)
MV 2.8V NO YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5503-1.8YMT YV 1.8V NO YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5503-1.2YMT
(4)
XV 1.2V NO YES –40°C to +125°C 4-Pin 1m m x 1mm Thin DFN
MIC5504-3.3YMT
SX
3.3V
YES
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5504-3.1YMT
TX
3.1V
YES
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5504-3.0YMT
PX
3.0V
YES
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5504-2.8YMT
MX
2.8V
YES
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5504-2.5YMT UX 2.5V YES YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5504-2.2YMT UW 2.2V YES YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5504-1.8YMT GX 1.8V YES YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
MIC5504-1.2YMT
ZX
1.2V
YES
YES
–40°C to +125°C
4-Pin 1mm x 1mm Thin DFN
MIC5504-3.3YM5
WXS
3.3V
YES
YES
–40°C to +125°C
5-Pin SOT23
MIC5504-2.8YM5
WXM
2.8V
YES
YES
–40°C to +125°C
5-Pin SOT23
MIC5504-2.5YM5 WXJ 2.5V YES YES –40°C to +125°C 5-Pin SOT23
MIC5504-1.8YM5 WXG 1.8V YES YES –40°C to +125°C 5-Pin SOT23
MIC5504-1.2YM5 WX4 1.2V YES YES –40°C to +125°C 5-Pin SOT23
Notes:
1. Other voltages available. Contact Micrel f or details.
2. Thin DFN ▲ = Pin 1 identifier.
3. Thin DFN is a GRE EN RoHS-compliant pack age. Lead finish is NiPdAu. Mold compound is Halogen Free.
4. Contact Mic rel Marketing for availabili ty.
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
3
Revision 2.3
Pin Configuration
4-Pin 1mm × 1mm Thin DFN (MT)
(Top View) 5-Pin SOT23 (M5)
(Top View)
Pin Description
Pin Name Pin Number
Thin DFN-4 Pin Number
SOT23-5 Pin Function
VOUT 1 5 Output Voltage. When disabled the MIC5502 and MIC5504 switches in an internal
25Ω load to discharge the external capacitors.
GND 2 2 Ground
EN 3 3 Enable Input: Active High. High = ON; Low = OFF. For MIC5501 and MIC5502 do not
leave floating. MIC5503 and MIC5504 have an internal pull-down and this pin may be
left floating.
VIN 4 1 Supply Input.
NC - 4 No Connection. Pin is not internally connected.
ePad EP - Exposed Heatsink Pad. Connect to GND for best thermal performance.
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
4
Revision 2.3
Absolute Maximum Ratings(5)
Supply Voltage (VIN) .......................................... –0.3V to 6V
Enable Voltage (VEN). ........................................ –0.3V to VIN
Power Dissip ati on (PD) ........................... Internally Limited(7)
Lead Temperature (soldering, 10s) ............................ 260°C
Junction Temperature (TJ) ........................ –40°C to +150°C
Storage Temperature (Ts) ......................... –65°C to +150°C
ESD Rating(8) .................................................................. 3kV
Operating Ratings(6)
Supply Voltage (VIN) ......................................... 2.5V to 5.5V
Enable Voltage (VEN) .............................................. 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
1mm × 1mm Thin DFN-4 (θJA) ......................... 250°C/W
5-pin SOT23 (θJA) ............................................ 253°C/W
Electrical Characteristics(9)
VIN = VEN = VOUT + 1V; CIN = COUT = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter Condition Min. Typ. Max. Units
Output Voltage Accuracy Variation from nominal VOUT –2.0 +2.0 %
Variation from nominal VOUT; –40°C to +125°C –3.0 +3.0 %
Line Regulation VIN = VOUT +1V to 5.5V; IOUT = 100µA 0.02
0.3
%/V
Load Regulation
(10)
IOUT = 100µA to 300mA 8 40 mV
Dropout Voltage(11) IOUT = 150mA
IOUT = 300mA 80
160 190
380 mV
mV
Ground Pin Current(12) IOUT = 0mA
IOUT = 300mA 38
42 55
65 µA
Ground Pin Current in Shutdown VEN = 0V 0.05 1 µA
Ripple Rejection f = 1kHz; COUT = 1µF 60 dB
Current Limit VOUT = 0V 400 630 900 mA
Output Voltage Noise COUT = 1µF, 10Hz to 100kHz 175 µVRMS
Auto-Discharge NFET
Resistance MIC5502, MIC5504 Only; VEN = 0V; VIN = 3.6V;
IOUT = –3mA 25 Ω
Enable Input
Enable Pull-Down Resistor For MIC5503 and MIC5504 use only 4
MΩ
Enable Input Voltage Logic Low 0.2 V
Logic High 1.2 V
Enable Input Current
MIC5501, MIC5502 VEN = 0V 0.01 1 µA
VEN = 5.5V 0.01 1 µA
Enable Input Current
MIC5503, MIC5504 VEN = 0V 0.01 1 µA
VEN = 5.5V 1.4 2 µA
Turn-On Time COUT = 1µF; IOUT = 150mA 50
125
µs
Notes:
5. Exceeding the absolute maximum rating may damage the device.
6. The device is not guaranteed to functi on outside its operati ng rating.
7. The maximum allowable power dissipati on of any TA (ambient temperature) is PD(max) = (TJ(max ) – TA) / θJA. Exceeding the maximum allowable power
dissipati on will result in excess i ve die temperature, and the regulator will go into thermal shutdown.
8. Devices are ESD sensitive. Handling precauti ons are recommended. Human body model, 1.5k Ω in series with 100pF.
9. Specific at i on for packaged product only.
10. Regulation is measured at constant juncti on tem perat ure using low duty cycle pulse testing. Changes in output voltage due to heating effects are
covered by the thermal regulation specif ication.
11. Dropout voltage is defi ned as the input-to-output differential at which the output volt age drops 2% below its nominal value measured at 1V
different i al. For outputs below 2.5V, dropout volt age is the input-to-output differential with the minimum input voltage 2.5V.
12. Ground pin current is t he regulator quiescent c urrent. T he total current drawn from t he supply is the sum of the load current plus the ground pin
current.
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
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Revision 2.3
Typical Characteris tics
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
010 100 1,000 10,000 100,0001,000,000
PSRR (dB)
FREQUENCY (Hz)
Power Supply
Rejection Ratio
C
OUT
= 1µF
CIN = 1µF
VIN = 3.8V
VOUT = 2.8V
IOUT = 100mA
IOUT = 300mA
10 100 1k 10k 100k 1M
0
20
40
60
80
100
120
140
160
050 100 150 200 250 300
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
VOUT = 3.3V
CIN = COUT = 1µF
0
20
40
60
80
100
120
140
160
180
200
-40 -20 020 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
vs.Temperature
50mA
150mA
V
OUT
= 3.3V
C
IN
= C
OUT
= 1µF
300mA
20
25
30
35
40
45
50
2.5 3.0 3.5 4.0 4.5 5.0 5.5
GROUND CURRENT (µA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
300mA
VEN = VIN
VOUT = 3.3V
CIN = COUT = 1µF
100µA
36
37
38
39
40
41
42
43
44
45
46
050 100 150 200 250 300
GROUND CURRENT (µA)
LOAD CURRENT (mA)
Ground Current
vs. Load Current
VIN = VEN = VOUT + 1
VOUT = 3.3V
CIN = COUT = 1µF
30
32
34
36
38
40
42
44
46
48
50
-40 -20 020 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Current
vs. Temperature
100µA
300mA
50mA
150mA
V
IN
= V
EN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 1µF
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
050 100 150 200 250 300
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Output Voltage
vs. Output Current
V
IN
= V
EN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 1µF
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Output Voltage
vs. Supply Voltage
V
IN
= V
EN
VOUT = 3.3V
CIN = COUT = 1µF
50mA
150mA
300mA
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-40 -20 020 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
300mA
150mA V
IN
= V
OUT
+ 1V
V
OUT
= 3.3V
C
IN
= C
OUT
= 1µF
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
6
Revision 2.3
Typical Characteristics (Continued)
300
350
400
450
500
550
600
650
700
750
2.5 33.5 44.5 55.5
CURRENT LIMIT (mA)
SUPPLY VOLTAGE (V)
Current Limit
vs. Supply Voltage
V
OUT
=1.2V
C
IN
= C
OUT
= 1µF
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
7
Revision 2.3
Functional Characteristics
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
8
Revision 2.3
Block Diagram
MIC550x Block Diagram
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
9
Revision 2.3
Application Information
MIC5501/2/3/4 are low-noise 300mA LDOs. The
MIC5502 an d MIC5504 include an au to-discharge circ uit
that is switched on when the regulator is disabled
through the enable (EN) pin. The MIC5503 and MIC5504
have an internal pull-down resistor on the EN pin to
ensure the output is disabled if the control signal is tri-
stated. The MIC5501/2/3/4 regulator is fully protected
from damage due to fault conditions, offering linear
current limiting and thermal shutdown.
Input Capacitor
The MIC5501/2/3/4 is a high-performance, high-
bandwidth device. An input capacitor of 1µF is required
from the input to ground to provide stability. Low-ESR
ceramic capacitors provide optimal performance at a
minim um of space. Additio nal hi gh-freque nc y capacit ors,
such as small-valued NPO dielectric-type capacitors,
help filter out high-frequency noise and are good
practice in any RF-based circuit. X5R or X7R dielectrics
are recommended for the input capac itor . Y5 V dielec tr ic s
lose m ost of their capac itance over temperatur e and are
therefore, not recommended.
Output Capacitor
The MIC5501/2/3/4 requires an output capacitor of 1µF
or greater to maintain stability. The design is optimized
for us e with low-ESR cer am ic chip capacitors. Hi gh ESR
capacitors are not recommended because they may
cause high-frequency oscillation. The output capacitor
can be increased, but performance has been optimized
for a 1µF cer amic output c a pacitor and do es not improve
significan tly with larger capac itanc e .
X7R/X5R dielectric-type 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 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 m ust be much higher than
an X7R ceram ic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
No-Load Stability
Unlik e man y other volta ge regu lators, t he MI C5501/2/3/4
remains stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
Enable/Shutdown
The MIC5501/2/3/4 comes with an active-high enable
pin that allows the regulator to be disabled. Forcing the
EN pin lo w disab les th e regulat or and se nds i t into a n off
mode current state drawing virtually zero current. When
disabled t he MIC55 02 and MIC55 04 s witch es an inter nal
25Ω load on the regulator output to discharge the
external capacitor.
Forcing t he EN pin high enables the outpu t voltage. The
MIC5501 and MIC5502 enable pin uses CMOS
technology and the EN pin cannot be left floating; a
floating EN pin m ay cause an ind eterm inate state on the
output. The MIC5503 and MIC5504 have an internal pull-
down resistor on the enable pin to disable the output
when the enable pin is floating.
Thermal Considerations
The MIC5501/2/3/4 is designed to provide 300mA 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. For example if the input voltage is 3.6V, the output
voltage is 2.8V, and the output current = 300mA. The
actual power dissipation of the regulator circuit can be
determined using Equation 1:
PD = (VIN – VOUT1) I OUT + VIN IGND Eq. 1
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power
diss ipatio n contri buted b y t he groun d current is < 1 % and
can be igno red fo r thi s calculatio n:
PD = (3.6V – 2.8V) × 300mA
PD = 0.240W
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and Equatio n 2:
−
=
JA
AJ(max)
D(max)
TT
P
θ
Eq. 2
TJ(max) = 125°C, the maximum junction tem perature of the
die, θJA thermal resistance = 250°C/W for the DFN
package.
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
10
Revision 2.3
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
250°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5501-MYMT at an
input voltage of 3.6V and 300mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.240W = (125°C – TA)/(250°C/W)
TA = 65°C
Therefore, the maximum ambient operating temperature
allowed in a 1mm × 1mm DFN package is 65°C. For a
full discussion of heat sinking and thermal effects on
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.
MIC5501/2/3/4
April 20, 2015
11
Revision 2.3
Typical Appli cation
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C2 GRM155R61A105KE15D Murata
(13)
Capacitor, 1µF Ceramic, 10V, X5R, S ize 0402 2
U1
MIC5501-xYMT
Micrel, Inc.(14) Single 300mA LDO in 1.0mm × 1.0mm DFN Package 1
MIC5502-xYMT
MIC5503-xYMT
MIC5504-xYMT
Notes:
13. Murata: www.murata.com.
14. Micrel, Inc.: www.micrel.com.
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
12
Revision 2.3
PCB Layout Recommendations (1mm × 1mm Thin DFN)
Top Layer
Bottom Layer
Micrel, Inc.
MIC5501/2/3/4
April 20, 2015
15
Revision 2.3
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-10 00 WEB http://www.micrel.com
Micrel, Inc. is a leading gl obal manufacturer of IC s olutions for the worldwide high pe rformance linear and power, LAN, and t iming & communications
markets. The Company’s products include advanced mixed
-signal, analog & power semiconductors; high-
performance communication, clock
management,
MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs.
Company
customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and comp
uter products.
Corporation headquarters and state
-of-the-art waf
er fabrication facilities are located in San Jose, CA, with regional sales and support offices and
advanced technol ogy design centers situated throughout the Americas, Europe, and Asia.
Additionally, the Company maintains an extensive network
of distribut
ors and reps worldwide.
Micrel makes no representations or warranties with respect to the accuracy or completeness of the inf
ormation 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. E
xcept as provided in Micrel’s terms and c onditions of sale for such produc ts, 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 infringem ent of any patent, copyright
, or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devic es or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or syst ems that (a) are int ended for surgic al implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant inj ury t o the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or syst ems is a Purchaser’s own risk a
nd Purchaser agrees to fully
indemnify Micrel f or any damages resulting from such use or sale.
© 2012 Micrel, Incorporated.
