MIC94305YMT [MICROCHIP]
BUF OR INV BASED PRPHL DRVR;
| 型号： | MIC94305YMT |
| 厂家： | 
MICROCHIP |
| 描述： | BUF OR INV BASED PRPHL DRVR 驱动 光电二极管 接口集成电路 |
| 文件： | 总13页 (文件大小：436K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC94305
500mA Switch
with Ripple Blocker™ Technology
General Description
Features
The MIC94305 is an integrated load switch that
incorporates Micrel’s Ripple Blocker active filter
technology. The MIC94305 provides high-frequency ripple
attenuation (switching noise rejection) for applications
where switching noise cannot be tolerated by sensitive
downstream circuits, such as RF applications. A low-
voltage logic enable pin disconnects the pass element and
puts the MIC94305 in a low current-shutdown state when
disabled.
• 1.8V to 3.6V input voltage range
• Active noise rejection over a wide frequency band
− >60dB from 40kHz to 5MHz
• Rated to 500mA output 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
• Logic-controlled enable pin
The MIC94305 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.
• −40°C to +125°C junction temperature range
Applications
• Smart phones
• Tablet PC/notebooks and webcams
• Digital still and video cameras
• Videoconferencing
The MIC94305 is packaged 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.
• Bar-code scanners
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Global positioning systems
• Automotive and industrial applications
_________________________________________________________________________________________________
Typical Application
PSRR COUT = 4.7µF
0
-10
-20
500mA
-30
-40
-50
-60
-70
-80
300mA
10mA
VIN = 2.5V + 40mVpp
10
10
100
100
1K
10K
100K
1M
00
10M
000
1,000 10,000 100,00 1,000,0 10,000,
0
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
M9999-091312-A
September 2012
Micrel, Inc.
MIC94305
Ordering Information
Part Number
MIC94305YCS*
MIC94305YMT1
Notes:
Marking Code
Package
Lead Finish
W1
2W
Pb-Free
Pb-Free
0.84mm × 1.32mm WLCSP
1.6mm × 1.6mm Thin DFN
1. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Contact Micrel Marketing for availability.
∗
Pin Configuration
6-Ball 0.84mm × 1.32mm CSP (CS)
Ball View
6-Pin 1.6mm × 1.6mm Thin DFN (MT)
Top View
Note:
1. Thin DFN ▲ = Pin 1 identifier.
Pin Description
Pin Number
(Thin DFN)
Ball Number
(CSP)
Pin Name
Pin Name
1, 2
3
A2, B2
C2
VOUT
GND
Power switch output.
Ground.
Enable input. A logic HIGH signal on this pin enables the part. Logic LOW
disables the output. Do not leave floating.
4
C1
EN
5, 6
EP
A1, B1
VIN
Power switch input and chip supply.
ePad
Exposed heatsink pad. Connect to Ground for best thermal performance.
−
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Micrel, Inc.
MIC94305
Functional Block Diagram
MIC94305 Block Diagram
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September 2012
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Micrel, Inc.
MIC94305
Absolute Maximum Ratings(1)
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
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
0.84mm x 1.32mm WLCSP (θJA).....................160°C/W
1.6mm x 1.6mm Thin DFN (θJA) ........................92°C/W
Electrical Characteristics(4)
VIN = VEN = 3.6V; IOUT = 1mA; COUT = 4.7µF; TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min.
1.8
Typ.
Max.
3.6
Units
V
Input Voltage
Voltage Drop
170
45
250
mV
VIN − VOUT, −40°C ≤ TJ ≤ +85°C
f = 20kHz, IOUT = 500mA
f = 100kHz to 5MHz, IOUT = 500mA
f = 10Hz to 100kHz
VOUT = 0V
VIN Ripple Rejection (PSRR)
dB
55
Total Output Noise
Current Limit
98
µVRMS
mA
µs
530
725
90
1100
150
Turn-On Time
Load Regulation
Ground Current
Shutdown Current
Enable
EN controlled
100µA to 100mA
10
mV
µA
IOUT = 100µA
150
0.2
200
5
VEN = 0V
µA
Input Logic LOW
Input Logic HIGH
Input Current
Notes:
0.4
V
V
1.0
0.01
1
µA
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.
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September 2012
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Micrel, Inc.
MIC94305
Typical Characteristics
PSRR COUT = 4.7µF
PSRR COUT = 4.7µF
PSRR COUT = 4.7µF
0
-10
-20
-30
-40
-50
-60
-70
-80
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
500mA
500mA
500mA
-30
-40
300mA
300mA
300mA
-50
-60
-70
VIN = 1.8V + 40mVpp
10mA
10mA
VIN = 2.5V + 40mVpp
VIN = 3.6V + 40mVpp
10mA
-80
10
10
100
100
1K
10K
100K
1M
00
10M
000
10
10
100
100
1K
10K
100K
1M
00
10M
1,000 10,000 100,00 1,000,0 10,000,
10
10
100
1K
10K
100K
1M
00
10M
000
1,000 10,000 100,00 1,000,0 10,000,
100
1,000 10,000 100,00 1,000,0 10,000,
0
000
0
0
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR COUT = 10µF
PSRR COUT = 10µF
PSRR COUT = 10µF
0
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
500mA
500mA
500mA
300mA
300mA
300mA
VIN = 1.8V + 40mVpp
VIN = 2.5V + 40mVpp
10mA
100k
VIN = 3.6V + 40mVpp
10mA
10mA
10
10
100
100
1k
10k
1M 10M
10
10
100
100
1k
10k
100k
1M 10M
00 000
10
10
100
1k
10k
100k
1M 10M
1,000 10,000 100,00 1,000,0 10,000,
1,000 10,000 100,00 1,000,0 10,000,
100
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
0
0
00
000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR COUT = 22µF
PSRR COUT = 22µF
PSRR COUT = 22µF
0
-10
-20
-30
-40
-50
-60
-70
-80
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
500mA
500mA
300mA
300mA
300mA
VIN = 1.8V + 40mVpp
10mA
10mA
VIN = 3.6V + 40mVpp
10mA
100K 1M
VIN = 2.5V + 40mVpp
10
10
100
100
1K
10K
100K 1M
10M
000
10
10
100
100
1K
10K
100K 1M
10M
000
1,000 10,000 100,00 1,000,0 10,000,
1,000 10,000 100,00 1,000,0 10,000,
10
100
100
1K
10K
10M
10
1,000 10,000 100,00 1,000,0 10,000,
0
00
0
00
0
00
000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
M9999-091312-A
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Micrel, Inc.
MIC94305
Typical Characteristics (Continued)
Output Voltage
vs. Output Current
Output Voltage
vs. Output Current
Voltage Drop
vs. Output Current
3.6
3.55
3.5
1.8
1.75
1.7
260
240
220
200
180
160
140
120
100
80
1.65
1.6
3.45
3.4
1.55
1.5
60
VIN = 1.8V
3.35
3.3
VIN = 3.6V
40
CIN = COUT = 4.7µF
1.45
1.4
CIN = COUT = 4.7µF
CIN = COUT = 4.7µF
20
VIN = 2V
0
0
50 100 150 200 250 300 350 400 450 500
0
50 100 150 200 250 300 350 400 450 500
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
Voltage Drop
vs. Input Voltage
Ground Current
vs. Input Voltage
Ground Current
vs. Output Current
250
240
230
220
210
200
190
180
170
160
180
160
140
120
100
80
CIN = COUT = 4.7µF
CIN = COUT = 4.7µF
170
160
150
140
130
120
400mA
500mA
500mA
300mA
60
300mA
40
100mA
VIN = 2.8V
10mA
20
CIN = COUT = 4.7µF
100mA
50mA
0
0
50 100 150 200 250 300 350 400 450 500
1.8
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6
1.8
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
MIC94305YMT
Output Noise Spectral Density
100
10
1
0.1
0.01
0.001
VIN = VEN1 = 3V
COUT = 4.7µF
10
10
100
100
1K
10K
100K
1M
00
10M
000
1,000 10,000 100,00 1,000,0 10,000,
0
FREQUENCY (Hz)
1
M9999-091312-A
September 2012
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Micrel, Inc.
MIC94305
Functional Characteristics
M9999-091312-A
September 2012
7
Micrel, Inc.
MIC94305
Application Information
Enable/Shutdown
The MIC94305 uses Ripple Blocker technology to
integrate a load switch with a high-performance active
filter. The MIC94305 includes a low-voltage logic enable
pin, and is fully protected from damage caused by fault
conditions, offering linear current limiting and thermal
shutdown.
The MIC94305 comes with an active-high enable pin
that allows the Ripple Blocker to be disabled. Forcing the
enable pin low disables the MIC94305 and sends it into
a “zero” off mode current state. In this state, current
consumed by the MIC94305 goes to nearly zero. 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.
Input Capacitor
The MIC94305 is a high-performance, high-bandwidth
device. An input capacitor of 4.7µF from the input to
ground is required to provide stability. Low-ESR ceramic
Thermal Considerations
capacitors provide optimal performance using
a
The MIC94305 is designed to provide 500mA 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 is 500mA. The
actual power dissipation of the Ripple Blocker™ can be
determined using the equation:
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
not recommended.
Output Capacitor
The MIC94305 requires an output capacitor of 4.7µF or
greater to maintain stability. For optimal ripple rejection
performance, a 4.7µF 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 4.7µF ceramic output capacitor and
does not improve significantly with larger capacitance.
PD = (VIN − VOUT) 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) × 500mA
X7R/X5R dielectric-type ceramic capacitors are
PD = 0.125W
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. 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.
To determine the package’s maximum ambient operating
temperature, use the junction-to-ambient thermal
resistance of the device and the following basic equation:
TJ(MAX) − TA
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
PD(MAX)
=
θJA
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.
No Load Stability
The MIC94305 will remain stable with no load. This is
especially important in CMOS RAM keep-alive
applications.
M9999-091312-A
September 2012
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Micrel, Inc.
MIC94305
Substituting PD for PD(MAX) and solving for the ambient
operating temperature gives the maximum operating
conditions for the regulator circuit.
For proper operation, do not exceed the maximum
power dissipation.
For example, when operating the MIC94305YMT at a
2.75V input voltage and 500mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.125W = (125°C − TA)/(92 °C/W)
TA = 113.5°C
It follows from this equation that the maximum ambient
operating temperature of 113.5°C is allowed in a 1.6mm
x 1.6mm DFN 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
M9999-091312-A
September 2012
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Micrel, Inc.
MIC94305
Typical Application Schematic
Bill of Materials
Item
Part Number
Manufacturer Description
Qty.
CIN, COUT C1005X5R1A475K
TDK(1)
Capacitor, 4.7µF Ceramic, 10V, X7R, Size 0603
2
U1
MIC94305YCS
Micrel, Inc.(2)
500mA Switch with Ripple Blocker Technology
1
Notes:
1. TDK: www.tdk.com.
2. Micrel, Inc.: www.micrel.com.
M9999-091312-A
September 2012
10
Micrel, Inc.
MIC94305
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.
M9999-091312-A
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Micrel, Inc.
MIC94305
Package Information(1) (Continued)
6-Pin 1.6mm × 1.6mm Thin DFN (MT)
M9999-091312-A
September 2012
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Micrel, Inc.
MIC94305
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.
M9999-091312-A
September 2012
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