MIC94310
200mA LDO with
Ripple Blocker™ Technology
General Description
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 low-
voltage logic enable pin facilitates ON/OFF control at
typical GPIO voltage levels.
The MIC94310 operates from an input voltage of 1.8V to
3.6V.
Packaged in a 0.88mm × 0.88mm 4-ball CSP, 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.
Features
•
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 CSP
•
1.2mm × 1.6mm 4-pin Thin DFN
•
5-pin SOT-23
•
Logic-controlled enable pin
• −40°C
to +125°C junction temperature range
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
0
-20
-40
-60
-80
-100
PSRR C
OUT
= 1µF
PSRR (dB)
I
OUT
= 200mA
I
OUT
= 100mA
V
IN
= 2.5V + 40mVpp
V
OUT
= 1.8V
I
OUT
= 10mA
-120
10
100
1K
10K
100K
1M
10M
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
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
October 30, 2013
Revision 2.0
Micrel, Inc.
MIC94310
Absolute Maximum
Ratings
(4)
Input Voltage (V
IN
) ...........................................–0.3 to +4.0V
Output Voltage (V
OUT
) ................. –0.3 to V
IN
+0.3V or +4.0V
Enable Voltage (V
EN
) ................... –0.3 to V
IN
+0.3V or +4.0V
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (Ts)......................... –65°C to +150°C
(6)
ESD Rating .................................................................. 3kV
Operating Ratings
(5)
Supply 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
TDFN (θ
JA
) ....................................................... 173°C/W
CSP (θ
JA
) ......................................................... 250°C/W
SOT-23 (θ
JA
) .................................................... 120°C/W
Electrical Characteristics
(7)
V
IN
= V
EN
= V
OUT
+ 500mV (V
IN
= V
EN
= 3.6V for V
OUT
≥ 3.1V); I
OUT
= 1mA; C
OUT
= 1µF (YCS, YMT), C
OUT
= 10µF (YM5); T
A
= 25°C,
bold
values indicate –40°C≤ T
J
≤ +125°C, unless noted.
Parameter
Input Voltage
Output Voltage Accuracy
Dropout Voltage
Load Regulation
Line Regulation
Ground Current
Shutdown Current
Variation from nominal V
OUT
V
IN
to V
OUT
dropout at 100mA output current
V
IN
to V
OUT
dropout at 200mA output current
1mA to 100mA
V
IN
= V
OUT
+ 500mV to 3.6V
No load to full load
V
EN
= 0V
f = 100Hz, I
OUT
= 100mA
V
IN
Ripple Rejection
f = 100kHz, I
OUT
= 100mA
f = 1MHz, I
OUT
= 100mA
f = 10MHz, I
OUT
= 100mA
Current Limit
Total Output Noise
Turn-on Time
Enable
Input Logic Level
Input Logic High
Input Current
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating ratings.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Specification for packaged product only.
Condition
Min.
1.8
–3
Typ.
±1
20
40
4
0.01
170
0.2
85
68
57
50
Max.
3.6
+3
50
100
0.5
250
5
Units
V
%
mV
mV
mV
%
µA
µA
dB
dB
dB
dB
V
OUT
= 0V
10Hz to 100kHz
250
400
83
70
700
mA
μV
RMS
μs
0.4
1.0
0.01
1
V
V
µA
October 30, 2013
5
Revision 2.0
嵌入式系统
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