MIC5501/2/3/4

Single 300mA LDO

in 1.0mm × 1.0mm DFN Package

General Description Features

The MIC5501/2/3/4 is an advanced general-purpose LDO • Input voltage range: 2.5V to 5.5V
ideal for powering general-purpose portable devices. The • Fixed output voltages from 1.0V to 3.3V
MIC5501/2/3/4 family of products provides a high-
• 300mA guaranteed output current
performance 300mA LDO in an ultra-small 1mm × 1mm
package. The MIC5502 and MIC5504 LDOs include an • High output accuracy (±2%)
auto-discharge feature on the output that is activated when • Low quiescent current: 38µA
the enable pin is low. The MIC5503 and MIC5504 have an • Stable with 1µF ceramic output capacitors
internal pull-down resistor on the enable pin that disables
• Low dropout voltage: 160mV @ 300mA
the output when the enable pin is left floating. This is ideal
for applications where the control signal is floating during • Output discharge circuit: MIC5502, MIC5504
processor boot up. • Internal enable pull-down: MIC5503, MIC5504
Ideal for battery-powered applications, the MIC5501/2/3/4 • Thermal-shutdown and current-limit protection
offers 2% initial accuracy, low dropout voltage (160mV at • 4-lead 1.0mm × 1.0mm Thin DFN package
300mA), and low ground current (typically 38µA). The • MIC5504 5-pin SOT23 package
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 temperature Applications
range of –40°C to 125°C. • Smartphones
Datasheets and support documentation can be found on • DSC, GPS, PMP, and PDAs
Micrel’s web site at: www.micrel.com. • Medical devices
• Portable electronics
• 5V systems

___________________________________________________________________________________________________________

Typical Application

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

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Ordering Information
Marking Output Auto- EN Temperature (2,3)
Part Number (1) Package
Code Voltage Discharge Pull-Down Range
(4)
MIC5501-3.3YMT 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
(4)
MIC5501-2.8YMT 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
(4)
MIC5501-1.2YMT 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
(4)
MIC5502-3.3YMT XS 3.3V YES NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
(4)
MIC5502-3.0YMT 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 1mm x 1mm Thin DFN
MIC5502-1.8YMT XG 1.8V YES NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
(4)
MIC5502-1.2YMT X4 1.2V YES NO –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
(4)
MIC5503-3.3YMT SV 3.3V NO YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
(4)
MIC5503-3.0YMT ZV 3.0V NO YES –40°C to +125°C 4-Pin 1mm x 1mm Thin DFN
(4)
MIC5503-2.8YMT 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
(4)
MIC5503-1.2YMT XV 1.2V NO YES –40°C to +125°C 4-Pin 1mm 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 for details.
2. Thin DFN ▲ = Pin 1 identifier.
3. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
4. Contact Micrel Marketing for availability.

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Pin Configuration

4-Pin 1mm × 1mm Thin DFN (MT) 5-Pin SOT23 (M5)

(Top View) (Top View)

Pin Description
Pin Number Pin Number
Pin Name Pin Function
Thin DFN-4 SOT23-5
Output Voltage. When disabled the MIC5502 and MIC5504 switches in an internal
VOUT 1 5
25Ω load to discharge the external capacitors.
GND 2 2 Ground
Enable Input: Active High. High = ON; Low = OFF. For MIC5501 and MIC5502 do not
EN 3 3 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.

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Absolute Maximum Ratings(5) Operating Ratings(6)

Supply Voltage (VIN) .......................................... –0.3V to 6V Supply Voltage (VIN) ......................................... 2.5V to 5.5V
Enable Voltage (VEN). ........................................ –0.3V to VIN Enable Voltage (VEN) .............................................. 0V to VIN
(7)
Power Dissipation (PD) ........................... Internally Limited Junction Temperature (TJ) ........................ –40°C to +125°C
Lead Temperature (soldering, 10s) ............................ 260°C Junction Thermal Resistance
Junction Temperature (TJ) ........................ –40°C to +150°C 1mm × 1mm Thin DFN-4 (θJA) ......................... 250°C/W
Storage Temperature (Ts) ......................... –65°C to +150°C 5-pin SOT23 (θJA) ............................................ 253°C/W
(8)
ESD Rating .................................................................. 3kV

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
Variation from nominal VOUT –2.0 +2.0 %
Output Voltage Accuracy
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
(10)
Load Regulation IOUT = 100µA to 300mA 8 40 mV
(11) IOUT = 150mA 80 190 mV
Dropout Voltage
IOUT = 300mA 160 380 mV
(12) IOUT = 0mA 38 55
Ground Pin Current µA
IOUT = 300mA 42 65
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 MIC5502, MIC5504 Only; VEN = 0V; VIN = 3.6V;
25 Ω
Resistance IOUT = –3mA
Enable Input
Enable Pull-Down Resistor For MIC5503 and MIC5504 use only 4 MΩ
Logic Low 0.2 V
Enable Input Voltage
Logic High 1.2 V
Enable Input Current VEN = 0V 0.01 1 µA
MIC5501, MIC5502 VEN = 5.5V 0.01 1 µA
Enable Input Current VEN = 0V 0.01 1 µA
MIC5503, MIC5504 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 function outside its operating rating.
7. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
8. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
9. Specification for packaged product only.
10. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are
covered by the thermal regulation specification.
11. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential. For outputs below 2.5V, dropout voltage is the input-to-output differential with the minimum input voltage 2.5V.
12. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin
current.

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Typical Characteristics
Power Supply Dropout Voltage Dropout Voltage
Rejection Ratio vs. Output Current vs.Temperature
-100 160 200

-90 180
140 300mA

DROPOUT VOLTAGE (mV)

DROPOUT VOLTAGE (mV)
-80 160
IOUT = 100mA 120
-70 140 VOUT = 3.3V
PSRR (dB)

100 CIN = COUT = 1µF

-60 120

-50 80 100 150mA

-40 80
IOUT = 300mA 60
-30 60
40 50mA
-20 COUT = 1µF 40
CIN = 1µF VOUT = 3.3V
VIN = 3.8V 20 CIN = COUT = 1µF
-10 20
VOUT = 2.8V
0 0 0
10
10 100 1k
1,000 10k
10,000 100k 1,000,000
100,000 1M 0 50 100 150 200 250 300 -40 -20 0 20 40 60 80 100 120

FREQUENCY (Hz) OUTPUT CURRENT (mA) TEMPERATURE (°C)

Ground Current Ground Current Ground Current

vs. Supply Voltage vs. Load Current vs. Temperature
50 46 50

45 48 300mA
300mA
45
GROUND CURRENT (µA)

GROUND CURRENT (µA)

GROUND CURRENT (µA)

44 46

43 44
40
42 42
50mA
35 100µA 41 40 150mA
40 38
100µA
30
39 36
VEN = VIN 38 VIN = VEN = VOUT + 1 34 VIN = VEN = VOUT + 1V
25 VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V
CIN = COUT = 1µF 37 CIN = COUT = 1µF 32 CIN = COUT = 1µF

20 36 30
2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 50 100 150 200 250 300 -40 -20 0 20 40 60 80 100 120
SUPPLY VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C)

Output Voltage Output Voltage Output Voltage

vs. Output Current vs. Supply Voltage vs. Temperature
3.50 3.5 3.50

3.4
3.45
3.45
3.3
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

50mA
3.40
3.2
3.40
3.35
3.1

3.30 3.0 3.35 300mA

150mA
2.9
3.25
3.30
2.8
3.20 VIN = VEN = VOUT+ 1V 150mA
300mA VIN = VEN
VOUT = 3.3V 2.7 VIN = VOUT+ 1V
VOUT = 3.3V 3.25 VOUT = 3.3V
3.15 CIN = COUT = 1µF CIN = COUT = 1µF
2.6 CIN = COUT = 1µF

3.10 2.5 3.20

0 50 100 150 200 250 300 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -40 -20 0 20 40 60 80 100 120

OUTPUT CURRENT (mA) SUPPLY VOLTAGE (V) TEMPERATURE (°C)

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Typical Characteristics (Continued)

Current Limit
vs. Supply Voltage
750

700

650
CURRENT LIMIT (mA)

600

550

500

450

400 VOUT = 1.2V

CIN = COUT = 1µF
350

300
2.5 3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)

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Functional Characteristics

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Block Diagram

MIC550x Block Diagram

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Application Information Enable/Shutdown

MIC5501/2/3/4 are low-noise 300mA LDOs. The The MIC5501/2/3/4 comes with an active-high enable
MIC5502 and MIC5504 include an auto-discharge circuit pin that allows the regulator to be disabled. Forcing the
that is switched on when the regulator is disabled EN pin low disables the regulator and sends it into an off
through the enable (EN) pin. The MIC5503 and MIC5504 mode current state drawing virtually zero current. When
have an internal pull-down resistor on the EN pin to disabled the MIC5502 and MIC5504 switches an internal
ensure the output is disabled if the control signal is tri- 25Ω load on the regulator output to discharge the
stated. The MIC5501/2/3/4 regulator is fully protected external capacitor.
from damage due to fault conditions, offering linear Forcing the EN pin high enables the output voltage. The
current limiting and thermal shutdown. MIC5501 and MIC5502 enable pin uses CMOS
technology and the EN pin cannot be left floating; a
Input Capacitor
floating EN pin may cause an indeterminate state on the
The MIC5501/2/3/4 is a high-performance, high- output. The MIC5503 and MIC5504 have an internal pull-
bandwidth device. An input capacitor of 1µF is required down resistor on the enable pin to disable the output
from the input to ground to provide stability. Low-ESR when the enable pin is floating.
ceramic capacitors provide optimal performance at a
minimum of space. Additional high-frequency capacitors, Thermal Considerations
such as small-valued NPO dielectric-type capacitors, The MIC5501/2/3/4 is designed to provide 300mA of
help filter out high-frequency noise and are good continuous current in a very small package. Maximum
practice in any RF-based circuit. X5R or X7R dielectrics ambient operating temperature can be calculated based
are recommended for the input capacitor. Y5V dielectrics on the output current and the voltage drop across the
lose most of their capacitance over temperature and are part. For example if the input voltage is 3.6V, the output
therefore, not recommended. voltage is 2.8V, and the output current = 300mA. The
actual power dissipation of the regulator circuit can be
Output Capacitor
determined using Equation 1:
The MIC5501/2/3/4 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 PD = (VIN – VOUT1) I OUT + VIN IGND Eq. 1
capacitors are not recommended because they may
cause high-frequency oscillation. The output capacitor
Because this device is CMOS and the ground current is
can be increased, but performance has been optimized
typically <100µA over the load range, the power
for a 1µF ceramic output capacitor and does not improve
dissipation contributed by the ground current is < 1% and
significantly with larger capacitance.
can be ignored for this calculation:
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
performance. X7R-type capacitors change capacitance PD = (3.6V – 2.8V) × 300mA
by 15% over their operating temperature range and are PD = 0.240W
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 To determine the maximum ambient operating
temperature ranges. To use a ceramic chip capacitor temperature of the package, use the junction-to-ambient
with Y5V dielectric, the value must be much higher than thermal resistance of the device and Equation 2:
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
 TJ(max) − TA 
range. PD(max) =  
 Eq. 2
 θ JA 
No-Load Stability
Unlike many other voltage regulators, the MIC5501/2/3/4
remains stable and in regulation with no load. This is TJ(max) = 125°C, the maximum junction temperature of the
especially important in CMOS RAM keep-alive die, θJA thermal resistance = 250°C/W for the DFN
applications. package.

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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

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Typical Application

Bill of Materials
Item Part Number Manufacturer Description Qty.
(13)
C1, C2 GRM155R61A105KE15D Murata Capacitor, 1µF Ceramic, 10V, X5R, Size 0402 2
MIC5501-xYMT
MIC5502-xYMT (14)
U1 Micrel, Inc. Single 300mA LDO in 1.0mm × 1.0mm DFN Package 1
MIC5503-xYMT
MIC5504-xYMT
Notes:
13. Murata: www.murata.com.
14. Micrel, Inc.: www.micrel.com.

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PCB Layout Recommendations (1mm × 1mm Thin DFN)

Top Layer

Bottom Layer

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Package Information(15) and Recommended Landing Pattern

4-Pin 1mm x 1mm Thin DFN (MT)

Note:
15. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.

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Package Information(15) and Recommended Landing Pattern (Continued)

5-Pin SOT23 (M5)

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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, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & 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 computer products.
Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and
advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network
of distributors and reps worldwide.

Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. 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.

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