MIC5353
500mA LDO in 1.6mm
×
1.6mm Package
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 • US A • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 27, 2015
Revision 2.0
General Description
The MIC5353 is a high-performance, single-output, ultra-
low LDO (ULDO™) regulator, offering a low total output
noise of 30μVRMS. The MIC5353 is capable of sourcing
500mA output current and offers high-PSRR and low-
output noise, making it an ideal solution for RF
applications.
The MIC5353 provides 2% accuracy, extremely low
dropout voltage (160mV @ 500mA), and low ground
current (t ypicall y 90µA) making it ideal for batter y-operated
applications. When disabled, the MIC5353 enters a zero-
off-mode current state, thereby drawing almost no current.
The MIC5353 is available in the 1.6mm x 1.6mm Thin
MLF® package, occupying only 2.56mm2 of PCB area, a
36% reduc ti on in b oar d are a c ompared to SC-70 and 2mm
x 2mm Thin MLF® packages.
The MIC5353 has an opera ting junc tio n temperatur e range
of –40°C to +125°C and is available in fixed and adjustable
output voltages in lead-free (RoHS-compliant) Thin MLF®
package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 500mA guaranteed output current
• Input voltage range: 2.6V to 6V
• Ultra low dropout vo ltag e: 160mV @ 500mA
• ±2% initial accuracy
• Ultra low output noise: 30µVrms
• Low quiescent current: 90µA
• Stable with ceramic output capacitors
• 35µs turn-on time
• Thermal shutdown and current limit protection
• Tiny 6-pin 1.6mm x 1.6mm Thin MLF® leadless package
Applications
• Mobile Phones
• GPS, PDAs, PMP, handhelds
• Portable electronics
• Digital still and video cameras
• Digital TV
_________________________________________________________________________________________________________________________
Typical Appli cation
Portable Application
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Ordering Information
Part Number Marking Code(1) Output Voltage(2) Temperature Range Package
MIC5353-1.8YMT
18R
1.8V
–40°C to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353-2.5YMT
25R
2.5V
–40°C to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353-2.6YMT 26R 2.6V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353-2.8YMT 28R 2.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353-3.0YMT 30R 3.0V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353-3.3YMT 33R 3.3V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF
®
MIC5353YMT
AAR ADJ –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF
®
Notes:
1. Pin 1 identifier= “▲”.
2. For other volt age options cont act Micrel Marketi ng.
3. Thin MLF® is a GREEN RoHS compliant package. Lead fi nish is NiPdAu, Mold compound is Halogen Free.
Pin Configuration
6-Pin 1.6mm × 1.6mm Thin MLF® (MT)
Fixed
(TOP VIEW)
6-Pin 1.6mm × 1.6mm Thin MLF®(MT)
Adjustable
(TOP VIEW)
Pin Description
Pin Number
Thin MLF-6
Fixed
Pin Number
Thin MLF-6
Adjustable
Pin Name Pin Function
1 1 EN Enable Input. Active High. High = ON, low = OFF. Do not leave floating.
2 2 GND Ground.
3 3 VIN Supply Input.
4 4 VOUT Output Voltage.
5 – NC No connection.
– 5 ADJ Adjust Input. Connect to external resistor voltage divider network.
6 6 BYP Reference Bypass: Connect external 0.1µF to GND for reduced Output Noise. May
be left open.
EPad EPad HS PAD Exposed Heat-sink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ..................................... −0.3V to +6.5V
Enable Input Voltage (VEN) ................................ −0.3V to VIN
Power Dissip ati on .................................. Internall y Limited(3)
Lead Temperature (soldering, 3sec) .......................... 260°C
Junction Temperature (TJ) ........................ −40°C to +125°C
Storage Temperature (TS) ......................... −65°C to +150°C
ESD Rating(4) ................................................................. 2KV
Operating Ratings(2)
Supply Voltage (VIN) ...................................... +2.6V to +6.0V
Enable Input Voltage (VEN) ...................................... 0V to VIN
Junction Temperature (TJ) .......................... −40°C to +125°C
Junction Thermal Resistance
6-Pin 1.6mm x1.6mm Thin MLF® (θJA) ........... 92.4°C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter Conditions 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 6V; IOUT = 100µA 0.05 0.3 %/V
0.6
Load Regulation IOUT = 100µA to 500mA 0.15 2.0 %
Dropout Voltage (6) IOUT = 150mA 50 100
mV
IOUT = 300mA 100
200
IOUT = 500mA 160 350
Ground Pin Current IOUT = 0 to 500mA 90 175 µA
Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 2 µA
Ripple Rejection f = 1kHz; COUT = 1.0µF; CBYP = 0.1µF 60 dB
f = 20kHz; COUT = 1.0µF; CBYP = 0.1µF 45
Current Limit VOUT = 0V 600 1100 1600 mA
Output Voltage Noise COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz 30 µVRMS
Enable Input
Enable Input Voltage Logic Low
0.2
V
Logic High 1.2
Enable Input Current VIL ≤ 0.2V 0.01 1 µA
VIH ≥ 1.2V 0.01 1
Turn-on Time
Turn-on Time COUT = 1.0µF; CBYP = 0.1µF 35
100
µs
Notes:
1. Exceeding the absolute maximum rati ng may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(m ax) – TA) / θJA. Exceeding t he m aximum allowable
power dissipation will result in exces sive die temperature, and the regulator will go into t hermal shutdown.
4. Devices are ESD sensitive. Handling precauti ons rec ommended. Hum an body model 1.5KΩ in series with 100pF.
5. Specification for packaged product only.
6. 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.
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Functional Diagram
MIC5353 Block Diagram – FIXED
MIC5353 Block Diagram – ADJUSTABLE
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Typical Characteris tics
Dropout Voltage
vs. O utput C urrent
0
20
40
60
80
100
120
140
160
180
200
050 100 150 200 250 300 350 400 450 500
O UTP UT CURRENT (m A)
DROPOUT VOLTAGE (mV)
Dropout Voltage
vs. Tem pe rature
0
50
100
150
200
250
-40 -20 020 40 60 80 100 120 140
TEMPERATURE (°C)
DROPOUT VOLTAGE (mV)
150mA
500mA
300mA
Ground Current
vs. Output Current
80
82
84
86
88
90
92
0100 200 300 400 500
Output Current(mA)
Ground Current(μA)
VOUT = 2.8V
VIN = 3.8V
Ground Current
vs. Temperat ure
60
70
80
90
100
110
120
-40 -20 020 40 60 80 100 120 140
TEM PERA T URE ( ° C)
GROUND CURRENT (μA)
I
OUT
= 500m A
I
OUT
= 100μA
Output Voltage
vs. Output Current
1.76
1.77
1.78
1.79
1.8
1.81
1.82
1.83
1.84
050 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT(mA)
OUTPUT VOLTAGE(V)
VIN=2.8V
COUT=CIN=1μF
Curre nt Limit
vs. Input Voltage
0.8
0.9
1
1.1
1.2
1.3
1.4
2.5 33.5 44.5 55.5 6
INPUT V OLTAGE(V)
CURRENT L IMIT(mA)
V
OUT
=2.8V
C
IN
=C
OUT
=1μF
PSRR
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
010 100 1,000 10,000 100,000 1,000,000 10,000,000
FREQUENCY (Hz)
dB
100µA
300µA
500µA
C
OUT
= 1 µF
C
BYP
= 0.1µF
Output Noise Spectral D ensit y
0.001
0.01
0.1
1
10
10 100 1,000 10,000 100,000 1,000,000 10,000,000
FREQUENCY (Hz)
Noise uV/√Hz
V
IN
= 4.5V
C
OUT
= 1µF
V
OUT
= 1.8V
I
LOAD
= 50m A
C
BYP
= 0.1µF
Out put Volt age
vs. Input V olt age
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
2.6 33.4 3.8 4.2 4.6 55.4 5.8
I NPUT VO LT AG E (V)
OUTPUT VOLTAG E ( V)
150mA
100μA
300mA
500mA
V
OUT
= 2.8V
C
IN
= C
OUT
= 1μF
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Functional Characteristics
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Applications Information
Enable/Shutdown
The MIC5353 comes with an 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.
Input Capacitor
The MIC5353 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1µF capacitor is
required from the input-to-ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. The use of
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.
Output Capacitor
The MIC5353 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, although
performance has been optimized for a 1µF ceramic
output capacitor and doing so does not improve
significan tly with larger cap ac itance .
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their temperature
performance. The 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 must be
much higher than an X7R ceramic capacitor thereby
ensuring the same minimum capacitance over the
equivalent operating temperature range.
Bypass Capacitor
A capacitor can be placed from the noise bypass p in-to-
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. A 0.1μF capacitor is
recommended for applications that require low-noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
increases slightly with respect to bypass capacitance.
A unique, quick-start circuit allows the MIC5353 to drive
a large capacitor on the bypass pin without significantly
slowing turn-on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5353 will
remain stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
Adjustable Regulator Applicatio n
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC5353 can be adjusted from
1.25V to 5.5 V by using two external resistors (Figure 1).
The resistors set the output voltage based on the
following equ at ion:
+= R2
R1
1VV
REFOUT
VREF = 1.25V
Figure 1. Adjustable Voltage Output
Thermal Considerations
The MIC5353 is designed to provide 500mA of
continuous current. 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 3.3V, the output voltage is 2.8V and
the output current = 500mA.
The actual power dissipation of the regulator circuit can
be determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
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Because this device is CMOS and the ground current is
typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation:
PD = (3.3V – 2.8V) × 500mA
PD = 0.25W
To determine the maximum ambient operating
temperature of the p ackage, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
PD(MAX) = TJ(MAX) - TA
JA
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 92.4°C/W.
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
92.4°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5353-2.8YMT at
an input voltage of 3.3V and 500mA load with a
minimum footprint layout, the maximum ambient
operating temperature TA can be determined as follows:
0.25W = (125°C – TA)/(92.4°C/W)
TA=101°C
Therefore, a 2.8V application with 500mA of output
current can accept an ambient operating temperature of
101°C in a 1.6mm x 1.6mm Thin MLF® package. 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 Schematic (Fixed Output)
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1,C3 06036D105KAT2A AVX
(1)
Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2
GRM188R60J105KE19D muRata
(2)
C2 06035C104KAT2A AVX
(1)
Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1
GRM188R71H104KA93D muRata
(2)
U1 MIC5353-XXYMT Micrel, Inc.
(3)
500mA LDO, 1.6mm x 1.6mm Thin MLF
®
1
Notes:
1. AVX: www.avx.com.
2. Murata Tel: www.murata.com.
3. Micrel, Inc.: www.micrel.com.
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Typical Application Schematic (Adjustable Output)
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1,C3 06036D105KAT2A AVX
(1)
Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2
GRM188R60J105KE19D muRata
(2)
C2 06035C104KAT2A AVX
(1)
Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1
GRM188R71H104KA93D muRata
(2)
R1 CRCW060320K0FKEA Vishay
(3)
Resistor, 20kΩ, 1%, 1/16W, Size 0603 1
R2 CRCW060310K0FKEA Vishay
(3)
Resistor, 10kΩ, 1%, 1/16W, Size 0603 1
U1 MIC5353YMT Micrel, Inc.
(4)
Adjustable 500mA LDO, 1.6mm x 1.6mm Thin MLF
®
1
Notes:
1. AVX: www.avx.com.
2. Murata Tel: www.murata.com.
3. Vishay Tel: www.vishay.com.
4. Micrel, Inc.: www.micrel.com.
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PCB Layout Recommendations
TOP LAYER
BOTTOM LAYER
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Package Information
6-Pin 1.6mm x 1.6mm Thin MLF® (MT)
Micrel, Inc.
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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 manufac t urer of IC soluti ons for the worldwide high-performance linear and power, LAN, and timing & comm unications
markets. The Company’s products inc l ude advanced mixed-signal, analog & power semic onduct ors; high-performance communication, clock
management, MEMs-based cloc k o scilla to rs & crysta l-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company
customers include l eadi ng manufact urers of enterpri se, consumer, industrial, m obile, t el ecommunications, automotive, and computer products.
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of distribut ors and reps worldwide.
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informat i on is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specificat i ons and descript i ons at any time without notice. No license, whether express , im plied, arisi ng by estoppel or ot herwise, t o any intellectual
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