MIC94305
500mA Switch
with Ripple Blocker™ Technology
General Description
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.
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 (V
OUT
) is
set at a fixed drop (typically 170mV) from the input voltage
(V
OUT
= V
IN
– 170mV). This maintains high efficiency
independent of given load conditions and currents.
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.
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 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
• −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
_________________________________________________________________________________________________
PSRR C
OUT
= 4.7µF
0
-10
-20
500mA
Typical Application
PSRR (dB)
-30
-40
-50
-60
-70
-80
10
10
V
IN
= 2.5V + 40mVpp
100
100
10mA
300mA
1K
10K
100K
1M
10M
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
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 2012
M9999-091312-A
Micrel, Inc.
MIC94305
Ordering Information
Part Number
MIC94305YCS*
MIC94305YMT
1
Notes:
1.
∗
Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Contact Micrel Marketing for availability.
Marking Code
W1
2W
Package
0.84mm
×
1.32mm WLCSP
1.6mm
×
1.6mm Thin DFN
Lead Finish
Pb-Free
Pb-Free
Pin Configuration
6-Ball 0.84mm
×
1.32mm CSP (CS)
Ball View
Note:
1.
Thin DFN
▲
= Pin 1 identifier.
6-Pin 1.6mm
×
1.6mm Thin DFN (MT)
Top View
Pin Description
Pin Number
(Thin DFN)
1, 2
3
4
5, 6
EP
Ball Number
(CSP)
A2, B2
C2
C1
A1, B1
−
Pin Name
VOUT
GND
EN
VIN
ePad
Pin Name
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.
Power switch input and chip supply.
Exposed heatsink pad. Connect to Ground for best thermal performance.
September 2012
2
M9999-091312-A
Micrel, Inc.
MIC94305
Functional Block Diagram
MIC94305 Block Diagram
September 2012
3
M9999-091312-A
Micrel, Inc.
MIC94305
Absolute Maximum Ratings
(1)
Input Voltage (V
IN
) ...........................................
−
0.3V to
+4V
Output Voltage (V
OUT
). ....................................
−
0.3V to
+
4V
Enable Voltage (V
EN
)..................−0.3V to V
IN
+
0.3V or
+4V
Lead Temperature (soldering, 10s)............................ 260°C
Storage Temperature (T
S
).........................
−65°C
to
+150°C
ESD Rating
(3)
.................................................................. 3kV
Operating Ratings
(2)
Input Voltage (V
IN
)........................................ +1.8V to +3.6V
Enable Voltage (V
EN
).............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
0.84mm x 1.32mm WLCSP (θ
JA
) .....................160°C/W
1.6mm x 1.6mm Thin DFN (θ
JA
) ........................92°C/W
Electrical Characteristics
(4)
V
IN
= V
EN
= 3.6V; I
OUT
= 1mA; C
OUT
= 4.7µF; T
A
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125
°C,
unless noted.
Parameter
Input Voltage
Voltage Drop
V
IN
Ripple Rejection (PSRR)
Total Output Noise
Current Limit
Turn-On Time
Load Regulation
Ground Current
Shutdown Current
Enable
Input Logic LOW
Input Logic HIGH
Input Current
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
Condition
V
IN
−
V
OUT
,
−40°C ≤
T
J
≤ +85°C
f = 20kHz, I
OUT
= 500mA
f = 100kHz to 5MHz, I
OUT
= 500mA
f = 10Hz to 100kHz
V
OUT
= 0V
EN controlled
100µA to 100mA
I
OUT
= 100µA
V
EN
= 0V
Min.
1.8
Typ.
170
45
55
98
Max.
3.6
250
Units
V
mV
dB
µV
RMS
530
725
90
10
150
0.2
1100
150
200
5
0.4
mA
µs
mV
µA
µA
V
V
µA
1.0
0.01
1
September 2012
4
M9999-091312-A
Micrel, Inc.
MIC94305
Typical Characteristics
PSRR C
OUT
= 4.7µF
0
-10
-20
500mA
0
-10
-20
500mA
PSRR C
OUT
= 4.7µF
0
-10
-20
PSRR C
OUT
= 4.7µF
PSRR (dB)
500mA
-30
-40
300mA
-50
-60
-70
-80
10
10
100
1, 000 10,000 100,00 1,000,0 10,000,
1K
10K
100K
1M
10M
100
0
00
000
V
IN
= 1.8V + 40mVpp
10mA
PSRR (dB)
-30
-40
-50
-60
-70
-80
10
10
V
IN
= 2.5V + 40mVpp
100
100
10mA
300mA
PSRR (dB)
-30
-40
300mA
-50
-60
-70
-80
10
10
V
IN
= 3.6V + 40mVpp
100
100
10mA
1K
10K
100K
1M
10M
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
1K
10K
100K
1M
10M
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR C
OUT
= 10µF
0
-10
-20
0
-10
-20
PSRR C
OUT
= 10µF
0
-10
-20
PSRR C
OUT
= 10µF
PSRR (dB)
-40
-50
-60
-70
-80
10
10
100
1,000 10,000 100,00 1,000,0 10,000,
1k
10k
100k
1M 10M
100
0
00
000
V
IN
= 1.8V + 40mVpp
10mA
300mA
PSRR (dB)
-30
-30
-40
-50
-60
-70
-80
10
10
100
100
V
IN
= 2.5V + 40mVpp
PSRR (dB)
500mA
500mA
300mA
-30
-40
-50
-60
500mA
300mA
10mA
-70
-80
V
IN
= 3.6V + 40mVpp
10
10
100
100
10mA
1k
10k
100k
1M 10M
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
1k
10k
100k
1M 10M
1,000 10,000 100,00 1,000,0 10,000,
0
00
000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR C
OUT
= 22µF
0
-10
-20
0
-10
-20
-30
PSRR C
OUT
= 22µF
0
-10
-20
500mA
-30
PSRR C
OUT
= 22µF
PSRR (dB)
-30
-40
-50
-60
-70
-80
10
10
100
100
1K
1,000
10K
100K 1M
10M
10,000 100,00 1,000,0 10,000,
0
00
000
V
IN
= 1.8V + 40mVpp
300mA
500mA
PSRR (dB)
PSRR (dB)
-40
-50
-60
-70
V
IN
= 2.5V + 40mVpp
-80
10
10
100
100
1K
1,000
-40
-50
-60
-70
10mA
300mA
300mA
10mA
10mA
-80
V
IN
= 3.6V + 40mVpp
10
10
100
100
1K
1,000
10K
100K 1M
10M
10,000 100,00 1,000,0 10,000,
0
00
000
10K
100K 1M
10M
10,000 100,00 1,000,0 10,000,
0
00
000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
September 2012
5
M9999-091312-A
嵌入式系统
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