MIC94310_14 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 200mA LDO with Ripple Blocker™ Technology

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 WLCSP, 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 WLCSP
• 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
PSRR C_OUT = 1µF
0
-20
-40
IOUT = 200mA
IOUT = 100mA
-60
-80
-100
VIN = 2.5V + 40mVpp
-120
IOUT = 10mA
VOUT = 1.8V
1.E1+001 1.E10+002 1.E1+K03 1.E10+K04 1.1E0+0K05 1.E1+M06 1.1E0+M07
FREQUENCY (Hz)
Ripple Blocker is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 11, 2014
Revision 2.1