MIC94305
500mA Switch
with Ripple Blocker™ Technology
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 2012 M9999-091312-A
ns. A low-
el
tronic device. The outp
s maintains hig
ckaged in a 6-ball 0.84mm x 1.32mm
CSP package, or 6-pin 1.6mm x 1.6mm Thin DFN
package, and 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
General Description
The MIC94305 is an integrated load
incorporates Micrel’s Ripple Blocker a
technology. The MIC94305 provides high-freq
switch that
ctive filter
uency ripple
attenuation (switching noise rejection) for
where switching noise cannot be tolerated b
downstream circuits, such as RF applicatio
voltage logic enable pin disconnects the pass
puts the MIC94305 in a low current-shutdown
disabled.
applications
y sensitive
ement and
state when
The MIC94305 operates from an input voltage
3.6V, allowing true load switching of low-vo
rails in any elec
of 1.8V to
ltage power
ut voltage (VOUT) is
set at a fixed drop (typically 170mV) from the i
(V = V – 170mV). Thi
nput voltage
OUT IN
independent of given load conditions and currents.
h efficiency
The MIC94305 is pa
Features
.
voltage range
n over a wide frequency band
40kHz to 5MHz
t current
• Current-limit and thermal-limit protected
Ultra-small 0.84mm x 1.32mm, 6-ball CSP
1.6mm x 1.6mm, 6-pin Thin DFN
d enable pin
°C junction temperature range
tions
• Tablet PC/notebooks and webcams
• Digital still and video cameras
• Videoconferencing
• Bar-code scanners
• Global positioning systems
• Automotive and industrial applications
_________________________________________________________________________________________________
Typical Application
• 1.8V to 3.6V input
• Active noise rejectio
− >60dB from
• Rated to 500mA outpu
•
•
• Logic-controlle
• −40°C to +125
Applica
• Smart phones
PSRR C
OUT
= 4.7µF
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,00
0
1,000,0
00
10,000,
000
FREQUENCY (Hz)
PSRR (dB)
V
IN
= 2.5V + 40mVpp 10mA
300mA
10 100 1K 10K 100K 1M 10M
500mA
Micrel, Inc. MIC94305
September 2012 2 M9999-091312-A
g Informati
er Marking Cod Package Lead Finish
Orderin on
Part Numb e
MIC94305YCS* W1
0.84mm × 1.32mm WLCSP Pb-Free
MIC94305YMT1 2W 1.6mm × 1.6mm Thin DFN Pb-Free
Notes:
1. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
∗availability.
Pin Configur
Contact Micrel Marketing for
ation
6-Ball 0.84mm × 1.32mm CSP (CS)
Ba
6-Pin 1.6mm × 1.6mm Thin DFN (MT)
Top View
Note
1. Thin DFN ▲ = identifier.
Pin Description
Pin Number
(Thin DFN)
Ball Number
(CSP) Pin Name Pin Name
ll View
:
Pin 1
1, 2 A2, B2 VOUT Power switch output.
3 C2 GND Ground.
4 C1 EN
Enable input. A logic HIGH signal on this pin enables the part. Logic LOW
disables the output. Do not leave floating.
5, 6 A1, B1 VIN Power switch input and chip supply.
EP − ePad Exposed heatsink pad. Connect to Ground for best thermal performance.
Micrel, Inc. MIC94305
September 2012 3 M9999-091312-A
Functional Block Diagram
MIC94305 Block Diagram
Micrel, Inc. MIC94305
September 2012 4 M9999-091312-A
0
0
0 V
mperature (sol
Storage Temperature (TS)......................... −65°C to +150°C
ESD Rating(3).................................................................. 3kV
................ +1.8V to +3.6V
ge (V 0V to VIN
............. –40°C to +125°C
0.84mm x 1.32mm WLCSP (θJA).....................160°C/W
1.6mm x 1.6mm Thin DFN (θJA) ........................92°C/W
al Characteristics(4)
VIN = VEN = 3.6V; IOUT = 1mA; bold values indicate –40°C J ≤ + °C, unless noted.
Min. Typ. Max. Units
Absolute Maximum Ratings(1)
Input Voltage (VIN) ........................................... −.3V to +4V Input Voltage (VIN)........................
Output Voltage (VOUT). .................................... −. to 4V lta EN)..............................................
.
3V +Enable Vo
Enable Voltage (VEN)..................−0.3V to VIN +
Lead Te dering, 10s)............................
.3 or +4V
260°C
Junction Temperature (TJ) ..........
Junction Thermal Resistance
Operating Ratings(2)
Electric
COUT = 4.7µF; TA = 25°C, ≤ T 125
Parameter Condition
Input Voltage 1.8 3.6 V
Voltage Drop VIN − VOUT, −40°C ≤ TJ ≤ +85°C 170
250 mV
f = 20kHz, IOUT = 500mA 45
VIN Ripple Rejection (PSRR 100kHz to 5MHz, IOUT = 500mA 55 dB ) f =
Total Output Noise f = 10Hz to 100kHz 98 µVRMS
Current Limit VOUT = 0V 530 725 1100 mA
Turn-On Time EN controlled 90 150 µs
Load Regulation 100µA to 100mA 10 mV
Ground Current I = 100µA 150 200 µA
OUT
Shutdown Current VEN = 0V 0.2 5 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 are recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
Micrel, Inc. MIC94305
September 2012 5 M9999-091312-A
Typical Characteristics
PS
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FR
PSRR (dB)
RR C
OUT
= 22µF
10,000 100,00
0
1,000,0
00
10,000,
000
EQUENCY (Hz)
V
IN
= 2.5V + 40mVpp
300mA
10mA
500mA
K 10K 100K 1M 10M10 100 1
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FREQ
PSRR (dB)
OUT
= 22µF
10,000 100,00
0
1,000,0
00
10,000,
000
UENCY (Hz)
V
IN
= 1.8V + 40mV
10 100 1K
pp
10K 100K 1M 10M
300mA
10mA
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FR
PSRR (dB)
OUT
= 22µF
10,000 100,00
0
1,000,0
00
10,000,
000
EQUENCY (Hz)
V
IN
= 3.6V + 40m
10 100 1K
Vpp
10K 100K 1M 10M
500mA
10mA
300mA
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FRE
PSRR (dB)
OUT
= 10µF
10,000 100,00
0
1,000,0
00
10,000,
000
QUENCY (Hz)
V
IN
= 1.8V + 40mV
10 100 1k
pp
10k 100k 1M 10M
500mA
300mA
10mA
PSRR C
-80
-70
-60
-5
-40
-30
-20
-10
0
10 100 1,000 10,000 100,00
0
1,000,0
00
10,000,
000
FREQUENCY (Hz)
PSRR (dB)
OUT
= 10µF
0
V
IN
= 2.5V + 40mVpp
300mA
10 100 1k 10k 100k 1M 10M
10mA
500mA
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FRE
PSRR (dB)
OUT
= 10µF
10,000 100,00
0
1,000,0
00
10,000,
000
QUENCY (Hz)
V
IN
= 3.6V + 40m
10 100 1k
Vpp
10k 100k 1M 10M
500mA
10mA
300mA
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 000 10,000 100,00
0
1,000,0
00
10,000,
000
FREQUENCY (Hz)
PSRR (dB)
OUT
= 4.7µF
1,
V
IN
= 1.8V + 40mVpp
10 100 1K 10K 100K 1M 10M
500mA
300mA
10mA
PSRR C
OUT
= 4.7µF
-8
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,00
0
1,000,0
00
10,000,
000
FREQUENCY (Hz)
PSRR (dB)
0
V
IN
= 2.5V + 40mVpp 10mA
300mA
10 100 1K 10K 100K 1M 10M
500mA
PSRR C
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000
FRE
PSRR (dB)
OUT
= 4.7µF
10,000 100,00
0
1,000,0
00
10,000,
000
QUENCY (Hz)
V
IN
= 3.6V + 40mVpp
500mA
10mA
300mA
10K 100K 1M 10M 10 100 1K
Micrel, Inc. MIC94305
September 2012 6 M9999-091312-A
Typical Characteristics (Continued)
Output Voltage
vs. Output Current
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
OUTPUT VOLTAGE (V)
Output Voltage
vs. Output Current
3.35
3.4
3.45
3.5
3.55
3.6
Voltage Drop
vs. Output Current
20
40
60
80
100
120
140
160
180
200
220
240
260
VOLTAGE DROP (mV)
3.3
0 50 100 150 200 250 300 350 400 450 500
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1.4
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
V
IN
= 1.8V
C
IN
= C
OUT
= 4.7µF
V
IN
= 3.6V
C
IN
= C
OUT
= 4.7µF
0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
C
IN
= C
OUT
= 4.7µF
V = 2V
IN
Ground Current
vs. Output Current
20
40
60
0
100
120
140
160
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
GROUND CURRENT (µA)
80
V
IN
= 2.8V
C
IN
= C
OUT
= 4.7µF
Voltage Drop
vs. Input Voltage
160
170
180
190
200
210
220
230
240
250
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
INPUT VOLTAGE (V)
VOLTAGE DROP (mV)
MIC94305YMT
Output Noise Spectral Density
0.001
0.01
0.1
1
10
100
NOISE µV/√Hz
10 100 1,000 10,000 100,00
0
1,000,0
00
10,000,
000
FREQUENCY (Hz)
V
IN
= V
EN1
= 3V
C
OUT
= 4.7µF
10 100 1K 10K 100K 1M 10M
1
Ground C
vs. Inp
120
130
140
150
160
170
180
1.8 2 2.2 2.4
INPU
GROUND CURRENT (µA)
urrent
ut Voltage
2.6 2.8 3 3.2 3.4 3.6
T VOLTAGE (V)
C
IN
= C
OUT
=4.7µF
500mA
C
IN
= C
OUT
= 4.7µF
400mA
500mA
300mA
100mA
300mA
10mA
100mA 50mA
Micrel, Inc. MIC94305
Functional Characteristics
September 2012 7 M9999-091312-A
Micrel, Inc. MIC94305
September 2012 8 M9999-091312-A
hnol
ance
ogic
s fully protected from damage caused b
ffering linear current limiting and t
-ban
he in
R c
us
cap
l-valued NPO dielectric-type cap
t high-frequency noise and are
die trics
diel ctrics
ure and
of 4 µF or
ection
ded. The
eram -chip
omm
illatio
an
pacitor and
citance.
because of their temp ature
capacitors change capa
a
Z5
ctric capacitors change value by as much as
50% and 60%, respectively, over their operating
temperature ranges. If you use a ceramic-chip capacitor
with a 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 MIC94305 will remain stable with no load. This is
especially important in CMOS RAM keep-alive
applications.
active-high enable pin
be disabled. Forcing the
94305 and sends it into
current
nearly zero. Forcing
high enables the output voltage. The
high enable pin uses CMOS technology and
enable pin may cause
tput.
to provide 500mA of
mall package. Maximum
can be calculated based
put current and the voltage drop across the
mV typical, 250mV worst case.
he input voltage is 2.75V, the output
rrent is 500mA. The
ipple Blocker™ can be
− VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current is
oad range, the power
und current is <1% and
ion:
PD− 2.5V) × 500mA
PD = 0.125W
imum ambient operating
ambient thermal
resistance of the device and the following basic equation:
PD(MAX) =
Application Information
The MIC94305 uses Ripple Blocker tec
integrate a load switch with a high-perform
filter. The MIC94305 includes a low-voltage l
pin, and i
ogy to
active
enable
y fault
hermal
Enable/Shutdown
The MIC94305 comes with an
that allows the Ripple Blocker to
enable pin low disables the MIC
a “zero” off mode current state. In this state,
consumed by the MIC94305 goes to
the enable pin
conditions, o
shutdown.
Input Capacitor
The MIC94305 is a high-performance, high
device. An input capacitor of 4.7µF from t
ground is required to provide stability. Low-ES
capacitors provide optimal performance
minimum of space. Additional high-frequency
such as smal
dwidth
put to
eramic
ing a
acitors,
acitors,
good
cannot be left floating; a floating
an indeterminate state on the ou
Thermal Considerations
The MIC94305 is designed
continuous current in a very s
ambient operating temperature
on the out
help filter ou
practice in any RF-based circuit. X5R or X7R
are recommended for the input capacitor. Y5V
lose most of their capacitance over temperat
not recommended.
Output Capacitor
The MIC94305 requires an output capacitor
lec
part, which is fixed at 170
For example, if t
e
are voltage is 2.5V, and the output cu
actual power dissipation of the R
determined using the equation:
.7
greater to maintain stability. For optimal ripple rej
performance, a 4.7µF capacitor is recommen
design is optimized for use with low-ESR c
capacitors. High-ESR capacitors are not rec
because they may cause high-frequency osc
output capacitor can be increased, but perform
been optimized for a 4.7µF ceramic output ca
does not improve significantly with larger capa
X7R/X5R dielectric-type ceramic capacitors are
recommended
PD = (VIN
ic
ended
n. The
ce has
typically <100µA over the l
dissipation contributed by the gro
can be ignored for this calculat
er
performance. X7R-type citance
nd are
U and
To determine the package’s max
temperature, use the junction-to-
by 15% over their operating temperature range
the most stable type of ceramic capacitors.
Y5V diele
active-
= (2.75V
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−
JA
AJ(MAX)
θ
TT
TJ(MAX) = 125°C, the maximum junction temperature of the
die; θJA thermal resistance = 160°C/W for the YCS
package, and 92°C/W for the YMT package.
Micrel, Inc. MIC94305
September 2012 9 M9999-091312-A
ient
op rating
the regulator circuit.
ma imum
MIC94305YMT at a
2.75V input voltage and 500mA load with a mi imum
footp m ambient op rating
temp an be determined as follows:
m a bient
owed in a 1.6mm
iscussion of heat
regulators, refer
to the “Regulator Thermals” section of Micrel’s De gning
boo This
can be found on Micrel's website at:
/other/LDOBk_ds.pdf
Substituting PD for PD(MAX) and solving for the amb
operating temperature gives the maximum
conditions for
e
For proper operation, do not exceed the
power dissipation.
For example, when operating the
x
n
rint layout, the maximu e
erature TA c
0.125W = (125°C − TA)/(92 °C/W)
TA = 113.5°C
It follows from this equation that the maximu
operating temperature of 113.5°C is all
m
x 1.6mm DFN package. For a full d
sinking and thermal effects on voltage si
with Low-Dropout Voltage Regulators hand
information
k.
http://www.micrel.com/_PDF
l’s Ripple Blocker
/rippleblocker/
For more information about Micre
products, go to:
http://www.micrel.com
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. MIC94305
September 2012 10 M9999-091312-A
Ty
pical Application Schematic
Part Number Manufacturer Description Qty.
Bill of Materials
Item
75K TDK(1) Capacitor, 4.7µF Ceramic, 10V, X7R, Size 0603 2 CIN, COUT C1005X5R1A4
U1
MIC94305YCS
Micrel, Inc.(2) 500mA Switch with Ripple Blocker Technology 1
Notes:
1. TDK: www.tdk.com.
2. Micrel, Inc.: www.micrel.com.
Micrel, Inc. MIC94305
September 2012 11 M9999-091312-A
Package Information(1)
6-Ball 0.84mm × 1.32mm WL-CSP (CS)
Note:
1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
Micrel, Inc. MIC94305
September 2012 12 M9999-091312-A
Package Information(1) (Continued)
6-Pin 1.6mm × 1.6mm Thin DFN (MT)
Micrel, Inc. MIC94305
September 2012 13 M9999-091312-A
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 9 4-1000 WEB http://www.micrel.com44-0800 FAX +1 (408) 47
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.
