MICREL MIC5356

MIC5355/6
Dual 500mA µCap Low Dropout,
Micropower Linear Regulator
General Description
Features
The MIC5355/6 is an advanced dual, micropower, low
dropout linear regulator. The MIC5355/6 provides low
quiescent current operation, using only 70μA with both
outputs enabled making it ideal for battery-powered
systems. In shutdown, the quiescent current drops to less
than 1µA. The MIC5355/6 provides two independentlycontrolled high-performance 500mA LDOs with typical
dropout voltage of 350mV at rated load. In addition, the
MIC5355/6 is optimized to provide fast load and line
transient performance with low-ESR ceramic output
capacitors, requiring a minimum of only 2.2µF.
The MIC5356 also incorporates an active discharge
feature when the part is disabled that switches in a 30Ω
load to pull down the output of the regulator. The
MIC5355/6 is available in fixed output voltages in a
thermally-enhanced 8-pin ePad MSOP package or 8-pin
ePad 3mm x 3mm MLF® package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.

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2.5V to 5.5V input voltage range
2% initial output accuracy
Wide output voltage range: 1.0V to 3.3V
Low quiescent current: 38µA per output
Very low quiescent current in shutdown: <1μA typical
µCap stable with 2.2µF ceramic capacitor
Low dropout voltage: 350mV at 500mA
Excellent load/line transient response
Independent logic controlled enable pins
Output discharge circuit: MIC5356
Current and thermal limit protection
Power 8-pin ePad MSOP package or 8-pin ePad 3mm
x 3mm MLF® package
Applications

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Smart phones
GPS, PMP, DSC
Notebooks and desktops
Digital TV
Portable electronics
_________________________________________________________________________________________________________________________
Typical Application
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
March 2012
M9999-031512-A
Micrel, Inc.
MIC5355/6
Ordering Information
Manufacturer Ordering
Part Number
Part Number
Marking
Code
Voltage(2)
Junction
Temperature
Range
Package
MIC5355-SGYMME
MIC5355-3.3/1.8YMME
55SG
3.3V/1.8V
–40° to +125°C
8-Pin ePad MSOP
MIC5355-S4YMME
MIC5355-3.3/1.2YMME
55S4
3.3V/1.2V
–40° to +125°C
8-Pin ePad MSOP
MIC5355-SCYMME
MIC5355-3.3/1.0YMME
55SC
3.3V/1.0V
–40° to +125°C
8-Pin ePad MSOP
MIC5355-G4YMME
MIC5355-1.8/1.2YMME
55G4
1.8V/1.2V
–40° to +125°C
8-Pin ePad MSOP
MIC5355-JGYMME
MIC5355-2.5/1.8YMME
55JG
2.5V1.8V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-SGYMME
MIC5356-3.3/1.8YMME
56SG
3.3V/1.8V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-S4YMME
MIC5356-3.3/1.2YMME
56S4
3.3V/1.2V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-SCYMME
MIC5356-3.3/1.0YMME
56SC
3.3V/1.0V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-G4YMME
MIC5356-1.8/1.2YMME
56G4
1.8V/1.2V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-JGYMME
MIC5356-2.5/1.8YMME
56JG
2.5V/1.8V
–40° to +125°C
8-Pin ePad MSOP
MIC5356-MMYML
MI5356-2.8/2.8YML
M3M
2.8V/2.8V
–40° to +125°C
8-Pin ePad 3mm x 3mm MLF
®
MIC5356-MGYML
MI5356-2.8/1.8YML
M3G
2.8V/1.8V
–40° to +125°C
8-Pin ePad 3mm x 3mm MLF
®
(1)
Notes:
1.
MIC5356 offers Auto-Discharge function.
2.
Other voltage available. Contact Micrel for detail.
Pin Configuration
8-Pin ePad 3mm x 3mm MLF® (ML)
8-Pin ePad MSOP (MME)
Pin Description
Pin Number
Pin Name
Pin Function
1
VIN
Supply Input.
2
GND
Ground.
3
NC
Not internally connected.
4
EN2
Enable Input LDO2. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating.
5
EN1
Enable Input LDO1. Active High Input. Logic High = On; Logic Low = Off; Do not leave floating.
6
NC
Not internally connected.
7
VOUT2
LDO2 Output.
8
VOUT1
LDO1 Output.
ePad
HSPAD
Heatsink pad. Connect to ground.
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MIC5355/6
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ........................................ –0.3V to +6V
Enable Voltage (VEN1, VEN2). ....................–0.3V to VIN +0.3V
Power Dissipation (PD) ........................... Internally Limited(3)
Lead Temperature (soldering, 10sec.)....................... 260°C
Junction Temperature (TJ) ........................–40°C to +125°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(4) ................................................. ESD Sensitive
Supply Voltage (VIN)....................................... +2.5V to 5.5V
Enable Voltage (VEN1, VEN2). ................................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
8-Pin ePad MSOP (θJA)..................................64.4°C/W
8-Pin ePad 3mm x 3mm MLF® (θJA)..................61°C/W
Electrical Characteristics(5)
VIN = VEN1 = VEN2 = VOUT +1V; higher of the two outputs; IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2= 2.2 µF; TJ = +25C,
bold values indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Condition
Min.
Typ.
Max.
Variation from nominal VOUT
2.0
+2.0
Variation from nominal VOUT
3.0
+3.0
Units
%
Line Regulation
VIN = VOUT + 1V to 5.5V, IOUT = 100µA
0.02
0.3
%/V
Load Regulation
IOUT = 100µA to 500mA
0.3
1
%
IOUT = 50mA
40
100
IOUT = 500mA
350
800
VEN1 = High; VEN2 = Low; IOUT1 = 0mA
38
53
VEN1 = Low; VEN2 = High; IOUT2 = 0mA
38
53
VEN1 = VEN2 = High; IOUT1 = IOUT2 = 0mA
70
100
VEN1 = High; VEN2 = Low; IOUT1 = 500mA
55
90
VEN1 = Low; VEN2 = High; IOUT2 = 500mA
55
90
VEN1 = VEN2 = High; IOUT1 = IOUT2 = 500mA
105
200
Shutdown Current
VEN1 = VEN2 0.2V
0.05
1
Ripple Rejection
f = 1kHz; COUT = 2.2µF; IOUT = 250mA
Current Limit
VOUT = 0V
Output Voltage Noise
COUT = 2.2µF, 10Hz to 100kHz
146
µVRMS
Auto-Discharge NFET
Resistance
MIC5356 only; VEN1 = VEN2 = 0V; VIN = 3.6V; IOUT = 3mA
30
Ω
Dropout Voltage
Ground Pin Current
60
525
750
mV
µA
µA
dB
1050
mA
Notes:
1.
Exceeding the absolute maximum rating 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(MAX)  TA) / JA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature and the register will go into thermal shutdown.
4.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5.
Specification for packaged product only.
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MIC5355/6
Electrical Characteristics(4)
VIN = VEN1 = VEN2 = VOUT +1V; higher of the two outputs; IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2= 2.2 µF; TJ = +25C,
bold values indicate –40°C to +125°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
Enable Inputs (EN1/EN2)
Enable Input Voltage
Enable Input Current
0.2
Logic Low
1.2
Logic High
VIL  0.2V
0.01
1
VIH  1.2V
0.01
1
50
125
Turn-On Time
V
µA
µs
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
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MIC5355/6
Typical Characteristics
Power Supply Rejection Ratio
Output Voltage
vs. Input Voltage
-60
OUTPUT VOLTAGE (V)
250mA
-50
500mA
-40
100µA
-30
VEN = VIN = 2.82V
-20
VOUT = 1.8V
-10
OUTPUT VOLTAGE (V)
2.9
-70
2.8
100μA
2.7
2.6
2.5
2.4
500mA
2.3
2.2
100
1000
10000
3
3.5
FREQUENCY (Hz)
1.7
4
4.5
5
5.5
2.5
Output Voltage
vs. Output Current (VOUT2)
OUTPUT VOLTAGE (V)
2.6
2.5
2.4
VIN = VEN1 = 3.5V
VOUT1 = 2.5V
65
60
55
50
45
40
35
30
25
20
15
10
5
0
1.9
1.8
1.7
VIN = VEN2 = 3.5V
VOUT2 = 1.8V
1.6
4
4.5
5
5.5
Ground Current vs.
Input Voltage (Single Output)
500mA
NO LOAD
VOUT2 = 1.8V
CIN = COUT = 2.2μF
VEN1 = GND, VEN2 = VIN
2.5
CIN = COUT = 2.2μF
3
CIN = COUT = 2.2μF
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
1.5
2.2
0
100
200
300
400
0
500
100
200
300
400
500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
Ground Current vs. Input
Voltage (Dual Output)
Ground Current
vs. Temperature (Single Output)
120
105
500mA
90
75
60
NO LOAD
45
VOUT1 = 2.5V, VOUT2 = 1.8V
30
CIN = COUT = 2.2μF
15
VEN1 = VEN2 = VIN
0
2.5
3
3.5
4
4.5
INPUT VOLTAGE (V)
5
5.5
70
65
105
90
DUAL OUTPUT
75
SINGLE OUTPUT
60
45
30
VIN = 3.5V
15
CIN = COUT = 2.2μF
0
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
GROUND CURRENT (μA)
GROUND CURRENT(μA)
120
GROUND CURRENT(μA)
3.5
INPUT VOLTAGE (V)
2
2.3
3
INPUT VOLTAGE (V)
Output Voltage
vs. Output Current (VOUT1)
2.7
500mA
1.6
2.5
100000
1.8
CIN = COUT = 2.2μF
2
10
100μA
CIN = COUT = 2.2μF
2.1
COUT = 2.2µF
0
1.9
GROUND CURRENT
(μA)
dB
2
3
-80
OUTPUT VOLTAGE (V)
Output Voltage
vs. Input Voltage
500mA
60
55
50
45
40
35
30
25
NO LOAD
V OUT1 =2.5V
20
15
10
V EN1 = VIN = 3V
V EN2 = GND
CIN = COUT = 2.2μF
5
0
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
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MIC5355/6
Typical Characteristics (Continued)
Ground Current
vs. Temperature (Dual Output)
80
60
NO LOAD
40
VOUT1 = 2.5V, VOUT2 = 1.8V
VEN1 = VEN2 = VIN = 3.5V
20
CIN = COUT = 2.2μF
400
350
-20
0
20
40
60
80
100
500mA
300mA
300
250
200
150mA
150
50mA
100
50
0
-40
CIN = COUT = 2.2μF
DROPOUT VOLTAGE (mV)
100
350
450
DROPOUT VOLTAGE (mV)
GROUND CURRENT (μA)
120
500mA
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
0
120
-40
-20
0
TEMPERATURE (°C)
20
40
60
80
100
120
TEMPERATURE (°C)
300
250
200
150
100
VOUT1 = 2.5V
50
CIN = COUT = 2.2μF
0
0
100
200
300
400
500
OUTPUT CURRENT (mA)
Current Limit
vs. Input Voltage
Output Noise Spectral Density
900
1
VOUT1 = 2.5V
NOISE (µV/√Hz)
CURRENT LIMIT (mA)
850
800
750
VIN = 3.5V
0.01
VOUT 2 = 1.8V
700
0.1
VOUT2 = 1.81V
CIN - COUT = 2.2µF
Noise (10Hz to 100Khz) =146µVrms
650
CIN = COUT = 2.2μF
0.001
10
600
2.5
3
3.5
4
4.5
5
5.5
100
1000
10000
100000 1000000
FREQUENCY (Hz)
INPUT VOLTAGE (V)
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MIC5355/6
Functional Characteristics
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MIC5355/6
Functional Diagrams
MIC5355 Block Diagram
MIC5356 Block Diagram
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MIC5355/6
Application Information
Enable/Shutdown
The MIC5355/6 comes with two active high enable pins
that allow each regulator to be disabled independently.
Forcing the enable pin low disables the regulator and
places it into an off mode current state drawing virtually
zero current. When disabled, the MIC5356 switches an
internal 30Ω load on the regulator output to discharge
the external capacitor.
Forcing the enable pin high enables the output voltage.
The active high enable pin uses CMOS technology and
cannot be left floating. A floating enable pin may cause
an indeterminate state on the output.
MIC5355/6 is a dual 500mA LDO. The MIC5356
includes an auto-discharge circuit for each LDO output
that is activated when the output is disabled. The
MIC5355/6 regulator is fully protected from damage due
to fault conditions through linear current limiting and
thermal shutdown.
Input Capacitor
The MIC5355/6 is a high-performance, high-bandwidth
device. A 2.2µF input capacitor from the input pin to
ground is required to provide stability. Low-ESR ceramic
capacitors provide optimal performance in small board
area. 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. X5R or X7R dielectrics are
recommended for the input capacitor. Y5V dielectrics
lose most of their capacitance over temperature and are
therefore not recommended.
Thermal Considerations
The MIC5355/6 is designed to provide two 500mA
continuous current outputs in a small package.
Maximum operating temperature can be calculated
based on the output currents and the voltage drop
across the part. For example, if the input voltage is 3.0V,
VOUT1 = 2.5V, VOUT2 = 1.8V and each with an output
current = 500mA. The actual power dissipation of the
regulator circuit can be determined using the equation:
Output Capacitor
The MIC5355/6 requires an output capacitor of 2.2µF 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 2.2µF ceramic output capacitor and
does not improve significantly with larger capacitance.
X7R and X5R dielectric ceramic capacitors are
recommended
because
of
their
temperature
performance. X7R 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 to ensure the same minimum
capacitance over the equivalent operating temperature
range.
PD = (VIN  VOUT1) IOUT  (VIN  VOUT2) IOUT2  VIN IGND
Because this is CMOS device and the ground current is
typically <100µA over the load range, the power
dissipation contributed by the ground current is <1%
which can be ignored for this calculation:
PD = (3.0V – 2.5V) × 500mA + (3.0V – 1.8V) × 500mA
PD = 0.85W
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:
 TJ(MAX)  TA
PD(MAX)  
θ JA

No Load Stability
Unlike many other voltage regulators, the MIC5355/6 will
remain stable and in regulation with no load.




TJ(MAX) = 125°C
θJA = 64.4°C/W
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MIC5355/6
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 64.4°C/W.
The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating a 2.5V/1.8V application
with an input voltage of 3.0V and 500mA at each
output with a minimum footprint layout, the maximum
ambient operating temperature TA can be determined
as follows:
0.85W = (125°C – TA)/(64.4°C/W)
TA = 70.3°C
Therefore, a MIC5355-JGYMME application with
500mA at each output current can accept an ambient
operating temperature of 70.3°C in a small 8-pin ePad
MSOP 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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MIC5355/6
Typical Application Schematic
Bill of Materials
Item
C1, C2, C3
U1
Part Number
C1005X5R0J225M
MIC5355/6-xxYMME
Manufacturer
(1)
TDK
Micrel, Inc.
(2)
Description
Qty.
2.2µF ceramic capacitor, 6.3V, X5R, size 0402
3
Dual 500mA µCap Low-Dropout, Micropower Linear Regulator
1
Notes:
1. TDK: www.tdk.com.
2. Micrel, Inc.: www.micrel.com.
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MIC5355/6
Typical Application Schematic (Continued)
Bill of Materials
Item
Part Number
C1, C2, C3
C1005X5R0J225M
U1
MIC5355/6-xxYML
Manufacturer
TDK(1)
Micrel, Inc.
(2)
Description
Qty.
2.2µF ceramic capacitor, 6.3V, X5R, size 0402
3
Dual 500mA µCap Low-Dropout, Micropower Linear Regulator
1
Notes:
3. TDK: www.tdk.com.
4. Micrel, Inc.: www.micrel.com.
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MIC5355/6
PCB Layout Recommendations (MME Package)
Top Layer
Bottom Layer
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PCB Layout Recommendations (ML Package)
Top Layer
Bottom Layer
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MIC5355/6
Package Information
8-Pin ePad MSOP (MME)
8-Pin ePad 3mm x 3mm MLF® (ML)
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MIC5355/6
Package Information (Continued)
Red circle indicates Thermal Via. Size should be .300 −.350mm in diameter, 1/00mm pitch, and it should be connected to
GND plane for maximum thermal performance.
8-Pin ePad MSOP (MME)
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Package Information (Continued)
Red circle indicates Thermal Via. Size should be .300 −.350mm in diameter, 1/00mm pitch, and it should be connected to
GND plane for maximum thermal performance.
8-Pin ePad 3mm x 3mm MLF® (ML)
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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 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.
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