MIC94300
200mA Switch
with Ripple Blocker™ Technology
Ripple Blocker 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 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
General Description
The MIC94300 is an integrated load switch that
incorporates Micrel’s Ripple Blocker™ active filter
technology. The MIC94300 provides high-frequency ripple
attenuation (switching noise rejection) for applications
where a switching noise cannot be tolerated by sensitive
downstream circuits such as in RF applications. A low-
voltage logic enable pin disconnects the pass element and
places the MIC94300 into a low current-shutdown state
when disabled.
The MIC94300 operates from an input voltage of 1.8V to
3.6V, allowing true load switching of low-voltage power
rails in any electronic device. The output voltage (VOUT) is
set at a fixed drop (typically 170mV) from the input voltage
(VOUT = VIN – 170mV). This maintains high efficiency
independent of given load conditions and currents.
Packaged in a 0.88mm x 0.88mm 4-ball CSP or 4-pin
1.2mm x 1.6mm Thin MLF® package, the MIC94300 has a
junction operating temperature range of −40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 1.8V to 3.6V input voltage range
• Active noise rejection over a wide frequency band
− >60dB from 40kHz to 5MHz
• Rated to 200mA output current
• Current-limit and thermal-limit protected
• Ultra-small 0.88mm x 0.88mm 4-ball CSP
• 1.2mm x 1.6mm, 4-pin Thin MLF®
• Logic-controlled enable pin
• −40°C to +125°C junction temperature range
Applications
• Smart phones
• Tablet PC/notebooks and webcams
• Digital still and video cameras
• Videoconferencing
• Bar-code scanners
• Global positioning systems
• Automotive and industrial applications
_________________________________________________________________________________________________
Typical Application
PSRR C
OUT
= 1µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN(NOM)
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
February 2012 M9999-020312-A
Micrel, Inc. MIC94300
February 2012 2 M9999-020312-A
Ordering Information
Part Number Marking Code Package Lead Finish
MIC94300YCS AF
0.88mm × 0.88mm WLCSP Pb-Free
MIC94300YMT1,2 43Z 1.2mm × 1.6mm Thin MLF® Pb-Free
Notes:
1. Thin MLF® ▲ = Pin 1 identifier.
2. Thin MLF® is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
Top View Top View
4-Ball 0.88mm × 0.88mm CSP (CS) 4-Pin 1.2mm × 1.6mm Thin MLF® (MT)
Pin Description
Pin Number
(Thin MLF®)
Ball Number
(CSP) Pin Name Pin Name
1 B2 EN
Enable input. A logic HIGH signal on this pin enables the part. Logic LOW
disables the output. Do not leave floating.
2 B1 GND Ground.
3 A1 VOUT Power switch output.
4 A2 VIN Power switch input and chip supply.
EP − ePad Exposed Heatsink Pad. Connect to Ground for best thermal performance.
Micrel, Inc. MIC94300
February 2012 3 M9999-020312-A
Functional Block Diagram
Micrel, Inc. MIC94300
February 2012 4 M9999-020312-A
Absolute Maximum Ratings(1)
Input Voltage (VIN) ........................................... −0.3V to +4V
Output Voltage (VOUT). .................................... −0.3V to +4V
Enable Voltage (VEN)..................−0.3V to VIN + 0.3V or +4V
Lead Temperature (soldering, 10s)............................ 260°C
Storage Temperature (TS)......................... −65°C to +150°C
ESD Rating(3).................................................................. 3kV
Operating Ratings(2)
Input Voltage (VIN)........................................ +1.8V to +3.6V
Enable Voltage (VEN).............................................. 0V to VIN
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
0.88mm x 0.88mm WLCSP (θJA).....................250°C/W
1.2mm x 1.6mm Thin MLF® (θJA).....................173°C/W
Electrical Characteristics(4)
VIN = VEN = 3.6V; IOUT = 100µA; COUT = 1µF; TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter Condition Min. Typ. Max. Units
Input Voltage 1.8 3.6 V
Voltage Drop VIN − VOUT, −40°C ≤ TJ ≤ +85°C 170
250 mV
f = 20kHz, IOUT = 100mA 45 VIN Ripple Rejection
(PSRR) f = 100kHz to 5MHz, IOUT = 100mA 60 dB
Total Output Noise f = 10Hz to 100kHz 98 µVRMS
Current Limit VOUT = 0V 200 315 400 mA
Turn-On Time EN controlled 40 150 µs
Load Regulation 100µA to 100mA 10 mV
Ground Current IOUT = 100µA 138 200 µA
Shutdown Current VEN = 0V 0.2 µA
Enable
Input Logic LOW 0.4 V
Input Logic HIGH 1.0 V
Input Current 0.01 1 µA
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.
Micrel, Inc. MIC94300
February 2012 5 M9999-020312-A
Typical Characteristics
PSRR C
OUT
= 1µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
I
OUT
= 10mA
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 3.6V + 40mVpp
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 0.47µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
I
OUT
= 10mA
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 3.6V+40mVpp
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 0.47µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN(NOM)
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 2.2µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
I
OUT
= 10mA
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 3.6V + 40mVpp
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 2.2µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN(NOM)
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 1µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN(NOM)
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 4.7µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
I
OUT
= 10mA
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 3.6V+40mVpp
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 4.7µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 10µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
I
OUT
= 10mA
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 3.6V + 40mVpp
10 100 1K 10K 100K 1M 10M
Micrel, Inc. MIC94300
February 2012 6 M9999-020312-A
Typical Characteristics (Continued)
Output Voltage
vs. Output Current
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
0 20 40 60 80 100 120 140 160 180 200
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= 2.0V
C
IN
= C
OUT
= 1µF
Output Voltage
vs. Output Current
3.30
3.35
3.40
3.45
3.50
3.55
3.60
0 20 40 60 80 100 120 140 160 180 200
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= 3.6V
C
IN
= C
OUT
= 1µF
Voltage Drop vs.
Output Current
165
170
175
180
185
190
195
0 25 50 75 100 125 150 175 200
OUTPUT CURRENT (mA)
VOLTAGE DROP (mV)
C
IN
= C
OUT
= 1µF
Ground Current
vs. Output Current
110
115
120
125
130
135
140
145
150
0 20 40 60 80 100 120 140 160 180 200
OUTPUT CURRENT (mA)
GROUND CURRENT (μA)
V
IN
= 3.6V
C
IN
= C
OUT
= 1μF
Ground Current
vs. Input Voltage
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
INPUT VOLTAGE (V)
GROUND CURRENT (μA)
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 200mA
C
IN
= C
OUT
= 1μF
PSRR (Varying C
OUT
)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
C
OUT
= 10µF
C
OUT
= 4.7µF
C
OUT
= 2.2µF
V
IN
= 3.6V + 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR C
OUT
= 10µF
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= V
IN(NOM)
+ 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
PSRR (Varying C
OUT
)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
FREQUENCY (Hz)
PSRR (dB)
C
OUT
= 2.2µF
C
OUT
= 1µF
C
OUT
= 0.47µF
V
IN
= 3.6V + 40mVpp
LOAD = 100mA
10 100 1K 10K 100K 1M 10M
Voltage Drop vs.
Input Voltage
165
170
175
180
185
190
195
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
INPUT VOLTAGE (V)
VOLTAGE DROP (mV)
C
IN
= C
OUT
= 1µF
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 200mA
Micrel, Inc. MIC94300
February 2012 7 M9999-020312-A
Typical Characteristics (Continued)
Current Limit
vs. Input Voltage
200
225
250
275
300
325
350
375
400
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
INPUT VOLTAGE (V)
CURRENT LIMIT (mA)
C
IN
= C
OUT
= 1μF
Output Noise
Spectral Density
0.01
0.1
1
10
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
Noise µV/√Hz
V
IN
= V
EN
= 2.91V
C
IN
= C
OUT
= 1.0µF
NOISE (10Hz to 100kHz) = 98.5µV
RMS
10 100 1K 10K 100K 1M
Micrel, Inc. MIC94300
February 2012 8 M9999-020312-A
Functional Characteristics
Micrel, Inc. MIC94300
February 2012 9 M9999-020312-A
Application Information
The MIC94300 utilizes Ripple Blocker™ technology to
integrate a load switch with a high-performance active
filter. The MIC94300 includes a low-voltage logic enable
pin, and is fully protected from damage due to fault
conditions, offering linear current limiting and thermal
shutdown.
Input Capacitor
The MIC94300 is a high-performance, high-bandwidth
device. An input capacitor of 470nF 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.
Output Capacitor
The MIC94300 requires an output capacitor of 0.47µF or
greater to maintain stability. For optimal ripple rejection
performance a 1µF capacitor is recommended. 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.
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 must be much higher than
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
No Load Stability
The MIC94300 will remain stable with no load. This is
especially important in CMOS RAM keep-alive
applications.
Enable/Shutdown
The MIC94300 comes with an active-high enable pin
that allows the Ripple Blocker™ to be disabled. Forcing
the enable pin low disables the MIC94300 and sends it
into a “zero” off mode current state. In this state, current
consumed by the MIC94300 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.
Thermal Considerations
The MIC94300 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 which is fixed at 170mV typical, 250mV worst case.
For example if the input voltage is 2.75V, the output
voltage is 2.5V, and the output current = 200mA. The
actual power dissipation of the Ripple Blocker™ can be
determined using the equation:
PD = (VIN − VOUT1) IOUT + VIN IGND
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 = (2.75V − 2.5V) × 200mA
PD = 0.05W
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:
PD(MAX) = ⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−
JA
AJ(MAX)
θ
TT
TJ(max) = 125°C, the maximum junction temperature of the
die, θJA thermal resistance = 250°C/W for the YCS
package and 173°C/W for the YMT package.
Micrel, Inc. MIC94300
February 2012 10 M9999-020312-A
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC94300YMT at an
input voltage of 2.75V and 200mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.05W = (125°C − TA)/(173°C/W)
TA = 116°C
Therefore the maximum ambient operating temperature
of 116°C is allowed in a 1.2mm x 1.6mm 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
For more information about Micrel’s Ripple Blocker™
products, go to:
http://www.micrel.com/rippleblocker/
http://www.micrel.com/page.do?page=/product-
info/products/mic94300.jsp
http://www.micrel.com/page.do?page=/product-
info/products/mic94310.jsp
Micrel, Inc. MIC94300
February 2012 11 M9999-020312-A
Evaluation Board Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1, C2 GRM155R61A105KE15D Murata(1) Capacitor, 1µF Ceramic, 10V, X7R, Size 0402 2
U1 MIC94300YCS Micrel, Inc.(2) 200mA Ripple Blocker™ Voltage Follower 1
Notes:
1. Murata Tel: www.murata.com.
2. Micrel, Inc.: www.micrel.com.
Micrel, Inc. MIC94300
February 2012 13 M9999-020312-A
Package Information1 (Continued)
4-Pin 1.2mm × 1.6mm Thin MLF® (MT)
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
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla
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.
can nt
© 2012 Micrel, Incorporated.
