MIC94310

MIC94310
200mA LDO with
Ripple Blocker™ Technology
General Description
Features
The MIC94310 Ripple Blocker™ is a monolithic integrated
circuit that provides low-frequency ripple attenuation
(switching noise rejection) to a regulated output voltage.
This is important for applications where a DC/DC switching
converter is required to lower or raise a battery voltage but
where switching noise cannot be tolerated by sensitive
downstream circuits such as in RF applications. The
MIC94310 maintains high power supply ripple rejection
(PSRR) with input voltages operating near the output
voltage level to improve overall system efficiency. A lowvoltage logic enable pin facilitates ON/OFF control at
typical GPIO voltage levels.
• 1.8V to 3.6V input voltage range
• Active noise rejection over a wide frequency band
− >50dB from 10Hz to 10MHz at 200mA load
• Rated to 200mA output current
• Fixed output voltages
• Current-limit and thermal-limit protected
• Ultra-small 0.88mm × 0.88mm 4-ball WLCSP
• 1.2mm × 1.6mm 4-pin Thin DFN
• 5-pin SOT-23
• Logic-controlled enable pin
− −40°C to +125°C junction temperature range
The MIC94310 operates from an input voltage of 1.8V to
3.6V.
Packaged in a 0.88mm × 0.88mm 4-ball WLCSP, a 4-pin
1.2mm × 1.6mm Thin DFN, or a 5-pin SOT-23, the
MIC94310 has a junction operating temperature range of
–40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Applications
•
•
•
•
•
•
Smartphones/Smart books
Tablet PC/notebooks and webcams
Digital still and video cameras
Global positioning systems
Mobile computing
Automotive and industrial applications
Typical Application
PSRR COUT = 1µF
0
PSRR (dB)
-20
-40
IOUT = 200mA
IOUT = 100mA
-60
-80
-100
VIN = 2.5V + 40mVpp
IOUT = 10mA
VOUT = 1.8V
-120
100 1.E+03
1K 1.E+04
10 1.E+02
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
1.E+01
FREQUENCY (Hz)
Ripple Blocker is a trademark of Micrel, 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
September 11, 2014
Revision 2.1
Micrel, Inc.
MIC94310
Ordering Information
Part Number
Package
(1, 2)
Marking Code
Output Voltage
Lead Finish
MIC94310-4YCS
1Z
1.2V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-FYCS
2Z
1.5V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-GYCS
Z9
1.8V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-DYCS
Z8
1.85V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-JYCS
Z7
2.5V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-LYCS
3Z
2.7V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-MYCS
Z6
2.8V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-NYCS
Z5
2.85V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-PYCS
Z4
3.0V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-SYCS
Z3
3.3V
0.88mm × 0.88mm WLCSP
Pb-Free
MIC94310-4YMT
31T
1.2V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-FYMT
32T
1.5V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-GYMT
31G
1.8V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-DYMT
31D
1.85V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-JYMT
31J
2.5V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-LYMT
31L
2.7V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-MYMT
31M
2.8V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-NYMT
31N
2.85V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-PYMT
31P
3.0V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-SYMT
31S
3.3V
1.2mm × 1.6mm Thin DFN
Pb-Free
MIC94310-4YM5
V31
1.2V
5-Pin SOT-23
Pb-Free
MIC94310-GYM5
W31
1.8V
5-Pin SOT-23
Pb-Free
MIC94310-MYM5
Z31
2.8V
5-Pin SOT-23
Pb-Free
MIC94310-SYM5
X31
3.3V
5-Pin SOT-23
Pb-Free
Note:
1. Thin DFN ▲ = Pin 1 identifier.
2. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
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Micrel, Inc.
MIC94310
Pin Configuration
0.88mm × 0.88mm 4-Ball CSP (CS)
1.2mm × 1.6mm 4-Pin TDFN (MT)
Top View
Top View
5-Pin SOT-23 (M5)
Top View
Pin Description
Pin Number
(TDFN)
Pin Number
(SOT-23)
Ball Number
(WLCSP)
Pin Name
1
5
A2
VOUT
Power switch output.
2
2
B2
GND
Ground.
3
3
B1
EN
Enable Input. A logic HIGH signal on this pin enables the part.
Logic LOW disables the part. Do not leave floating.
4
1
A1
VIN
Power switch input and chip supply.
–
4
–
NC
No Connect. Not internally connected.
EP
–
–
ePad
September 11, 2014
Pin Function
Exposed Heatsink Pad. Connect to ground for best thermal
performance.
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Revision 2.1
Micrel, Inc.
MIC94310
Functional Diagram
September 11, 2014
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Micrel, Inc.
MIC94310
Absolute Maximum Ratings(3)
Operating Ratings(4)
Input Voltage (VIN) ...........................................–0.3 to +4.0V
Output Voltage (VOUT) ................. –0.3 to VIN+0.3V or +4.0V
Enable Voltage (VEN) ................... –0.3 to VIN+0.3V or +4.0V
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (Ts)......................... –65°C to +150°C
(5)
ESD Rating .................................................................. 3kV
Supply Voltage (VIN) ..................................... +1.8V to +3.6V
Enable Voltage (VEN) .............................................. 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
TDFN (θJA) ....................................................... 173°C/W
WLCSP (θJA) .................................................... 250°C/W
SOT-23 (θJA) .................................................... 120°C/W
Electrical Characteristics(6)
VIN = VEN = VOUT + 500mV (VIN = VEN = 3.6V for VOUT ≥ 3.1V); IOUT = 1mA; COUT = 1µF (YCS, YMT), COUT = 10µF (YM5); TA = 25°C,
bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min.
Max.
Units
3.6
V
±1
+3
%
VIN to VOUT dropout at 100mA output current
20
50
mV
VIN to VOUT dropout at 200mA output current
40
100
mV
Load Regulation
1mA to 100mA
4
Line Regulation
VIN = VOUT + 500mV to 3.6V
0.01
0.5
%
Ground Current
No load to full load
170
250
µA
Shutdown Current
VEN = 0V
0.2
5
µA
f = 100Hz, IOUT = 100mA
85
dB
f = 100kHz, IOUT = 100mA
68
dB
f = 1MHz, IOUT = 100mA
57
dB
50
dB
1.8
Input Voltage
Output Voltage Accuracy
Dropout Voltage
VIN Ripple Rejection
Typ.
–3
Variation from nominal VOUT
f = 10MHz, IOUT = 100mA
Current Limit
VOUT = 0V
Total Output Noise
10Hz to 100kHz
250
Turn-on Time
400
mV
700
mA
83
μVRMS
70
μs
Enable
0.4
Input Logic Level
1.0
Input Logic High
Input Current
V
V
0.01
1
µA
Notes:
3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guaranteed to function outside its operating ratings.
5. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specification for packaged product only.
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Micrel, Inc.
MIC94310
Typical Characteristics
PSRR COUT = 0.47µF
0
-20
-20
-40
IOUT = 200mA
-60
-80
-100
IOUT = 10mA
-20
VIN = 2.5V
-40
-60
VIN = 3.6V
-80
VIN = VIN(NOM) + 40mVpp
LOAD = 100mA
VOUT = 1.8V
-100
VIN = 2.5V + 40mVpp
VOUT = 1.8V
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
-40
IOUT = 100mA
-60
-80
IOUT = 10mA
FREQUENCY (Hz)
PSRR COUT = 2.2µF
0
VIN = VIN(NOM) + 40mVpp
LOAD = 100mA
VOUT = 1.8V
PSRR COUT = 2.2µF
0
0
-20
-20
VIN = 2.5V
-60
-80
-40
IOUT = 200mA
IOUT = 100mA
-60
-80
VIN = 3.6V
-100
PSRR (dB)
PSRR (dB)
PSRR (dB)
VIN = 2.0V
-40
VIN = 2.5V + 40mVpp
VOUT = 1.8V
-100
VIN = 2.5V + 40mVpp
VOUT = 1.8V
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
FREQUENCY (Hz)
PSRR COUT = 1µF
IOUT = 200mA
-100
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
FREQUENCY (Hz)
-20
0
VIN = 2.0V
IOUT = 100mA
PSRR COUT = 1µF
PSRR (dB)
0
PSRR (dB)
PSRR (dB)
PSRR COUT = 0.47µF
-40
VIN = VIN(NOM) + 40mVpp
LOAD = 100mA
VOUT = 1.8V
VIN = 2.0V
VIN = 2.5V
-60
-80
VIN = 3.6V
-100
IOUT = 10mA
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR COUT = 4.7µF
FREQUENCY (Hz)
PSRR COUT = 10µF
PSRR COUT = 4.7µF
0
0
-20
0
-20
IOUT = 200mA
-20
VIN = 2.0V
VIN = 2.5V
IOUT = 100mA
-60
-80
-40
PSRR (dB)
-40
PSRR (dB)
PSRR (dB)
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
-60
-80
-40
IOUT = 200mA
IOUT = 100mA
-60
-80
VIN = 3.6V
-100
IOUT = 10mA
VIN = 2.5V + 40mVpp
VOUT = 1.8V
-120
1.E+01
100K 1.E+06
1M 1.E+07
10M
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
FREQUENCY (Hz)
September 11, 2014
VIN = VIN(NOM) + 40mVpp
LOAD = 100mA
VOUT = 1.8V
-100
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
1M 1.E+07
10M
10K 1.E+05
100K 1.E+06
FREQUENCY (Hz)
6
-100
IOUT = 10mA
VIN = 2.5V + 40mVpp
VOUT = 1.8V
-120
1.E+01
100 1.E+03
1K 1.E+04
1M 1.E+07
10M
10 1.E+02
10K 1.E+05
100K 1.E+06
FREQUENCY (Hz)
Revision 2.1
Micrel, Inc.
MIC94310
Typical Characteristics (Continued)
PSRR COUT = 10µF
PSRR (Varying COUT)
0
0
0
VIN = VIN(NOM) + 40mVpp
LOAD = 100mA
VOUT = 1.8V
COUT = 0.47µF
-20
COUT = 2.2µF
VIN = 2.0V
COUT = 1µF
-60
-60
-80
VIN = 3.6V
-100
-100
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
-120
1.E+01
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
35
1.900
30
1.875
25
20
15
10
1.800
1.775
1.750
VIN = 3.6V
0
1.700
100
125
150
175
200
CIN = COUT = 1µF
Output Voltage
vs. Input Voltage
1.90
1.85
1.80
1.75
0
20
1.65
40
60
80 100 120 140 160 180 200
2
GROUND CURRENT (μA)
VIN = VEN = 3.1V
CIN = COUT = 1µF
VOUT = 1.8V
NOISE (10Hz to 100kHz)
= 82.55µVRMS
1k
1.E+03
10k
1.E+04
FREQUENCY (Hz)
September 11, 2014
2.6
2.8
3
3.2
3.4
3.6
Ground Current
vs. Input Voltage
175
1.00
2.4
INPUT VOLTAGE (V)
Ground Current
vs. Output Current
10.00
100
1.E+02
2.2
OUTPUT CURRENT (mA)
Output Noise Spectral Density
0.01
10
1.E+01
IOUT = 200mA
1.70
1.60
OUTPUT CURRENT (mA)
0.10
FREQUENCY (Hz)
1.95
1.825
1.725
75
-120
10 1.E+02
100 1.E+03
1K 1.E+04
10K 1.E+05
100K 1.E+06
1M 1.E+07
10M
1.E+01
2.00
1.850
5
50
-100
Output Voltage
vs. Output Current
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
Dropout Voltage
vs. Output Current
25
COUT = 4.7µF
VIN = 2.5V + 40mVpp
LOAD = 100mA
VOUT = 1.8V
FREQUENCY (Hz)
FREQUENCY (Hz)
0
-80
COUT = 2.2µF
VIN = 2.5V + 40mVpp
LOAD = 100mA
VOUT = 1.8V
COUT = 10µF
-60
OUTPUT VOLTAGE (V)
-80
-40
PSRR (dB)
VIN = 2.5V
-40
PSRR (dB)
PSRR (dB)
-40
-20
190
170
165
160
155
VIN =2.8V
GROUND CURRENT (μA)
-20
Noise µV/√Hz
PSRR (Varying COUT)
180
IOUT = 200mA
170
160
IOUT = 100mA
150
140
CIN = COUT =1µF
130
CIN = COUT =1µF
100k
1.E+05
1M
1.E+06
120
150
0
20
40
60
80
100 120 140 160 180 200
OUTPUT CURRENT (mA)
7
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
INPUT VOLTAGE (V)
Revision 2.1
Micrel, Inc.
MIC94310
Functional Characteristics
September 11, 2014
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Micrel, Inc.
MIC94310
Application Information
The MIC94310 is a very-high PSRR, fixed-output, 200mA
LDO utilizing Ripple Blocker technology. The MIC94310
is fully protected from damage due to fault conditions,
offering linear current limiting and thermal shutdown.
Enable/Shutdown
Forcing the enable (EN) pin low disables the MIC94310
and sends it into a “zero” off mode current state. In this
state, current consumed by the MIC94310 goes nearly to
zero. Forcing EN high enables the output voltage. The
EN pin uses CMOS technology and cannot be left floating
as it could cause an indeterminate state on the output.
Input Capacitor
The MIC94310 is a high-performance, high-bandwidth
device. An input capacitor of 0.47µF is required from the
input to ground to provide stability. Low-ESR ceramic
capacitors provide optimal performance at a minimum of
space. 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 MIC94310 is designed to provide 200mA 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 2.5V, the output
voltage is 1.8V, and the output current = 200mA. The
actual power dissipation of the Ripple Blocker™ can be
determined using Equation 1:
Output Capacitance
In order to maintain stability, the MIC94310 requires an
output capacitor of 0.47µF or greater for the Thin DFN
and WLCSP packages and 10µF or greater for the SOT23 package. For optimal ripple rejection performance a
1µF capacitor is recommended for the CSP and Thin
DFN packages, while a 10µF capacitor is recommended
for the SOT-23 package. The design is optimized for use
with low-ESR ceramic chip capacitors. High-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 ceramic output capacitor and does not improve
significantly with larger capacitance.
PD = (VIN – VOUT1) IOUT + VIN IGND
Because this device is CMOS and the ground current is
typically <170µA over the load range, the power
dissipation contributed by the ground current is <1% and
can be ignored for this calculation.
PD = (2.5V – 1.8V) × 200mA
PD = 0.14W
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 their value by as much as
50% and 60%, respectively, over their operating
temperature ranges. To use a ceramic chip capacitor with
the 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.
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the Equation 2:
 TJ(max) − TA
PD(MAX) = 
θJA





Eq. 2
TJ(MAX) = 125ºC, the maximum junction temperature of the
die, θJA thermal resistance = 173°C/W for the Thin DFN
package.
No Load Stability
The MIC94310 will remain stable and in regulation with
no load. This is especially important in CMOS RAM keepalive applications.
September 11, 2014
Eq. 1
Substituting PD for PD(MAX) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
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Micrel, Inc.
MIC94310
For proper operation, the maximum power dissipation
must not be exceeded.
For example, when operating the MIC94310-GYMT at an
input voltage of 2.5V and 200mA load with a minimum
footprint layout, the maximum ambient operating
temperature (TA) can be determined as follows:
0.14W = (125ºC – TA)/(173ºC/W)
TA = 101ºC
Therefore, the maximum ambient operating temperature
allowed in a 1.2mm × 1.6mm Thin DFN package is
101ºC. 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
For more information about Micrel’s Ripple Blocker
products, please visit:
http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters.html
http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters/article/1mic94300.html
http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters/article/3mic94310.html
September 11, 2014
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Micrel, Inc.
MIC94310
Evaluation Board Schematic
Bill of Materials
Item
C1, C2
U1
Part Number
GRM155R61A105KE15D
MIC94310-xxYMT
Manufacturer
Murata
(7)
(8)
Micrel, Inc.
Description
Qty.
Capacitor, 1µF Ceramic, 10V, X7R, Size 0402
2
200mA LDO with Ripple Blocker Technology
1
Notes:
7. Murata: www.murata.com.
8. Micrel, Inc.: www.micrel.com.
September 11, 2014
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Micrel, Inc.
MIC94310
Package Information and Recommended Landing Pattern(9)
4-Ball 0.88mm × 0.88mm WLCSP (CS)
Note:
9. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
September 11, 2014
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MIC94310
Package Information and Recommended Landing Pattern(9) (Continued)
4-Pin 1.2mm × 1.6mm Thin DFN (MT)
September 11, 2014
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Revision 2.1
Micrel, Inc.
MIC94310
Package Information and Recommended Landing Pattern(9) (Continued)
5-Pin SOT-23 (M5)
September 11, 2014
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Micrel, Inc.
MIC94310
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.
September 11, 2014
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