MIC5203_09 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – μCap 80mA Low-Dropout Regulator

MIC5203
μCap 80mA Low-Dropout Regulator
General Description
The MIC5203 is a µCap 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225µA at
20mA output), offering better than 3% initial accuracy with
a logic-compatible enable input.
TheµCap regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.47µF of output capacitance for stability.
Designed especially for hand-held, battery-powered
devices, the MIC5203 can be controlled by a CMOS or
TTL compatible logic signal. When disabled, power
consumption drops nearly to zero. If on-off control is not
required, the enable pin may be tied to the input for 3-
terminal operation. The ground current of the MIC5203
increases only slightly in dropout, further prolonging
battery life. Key MIC5203 features include current limiting,
overtemperature shutdown, and protection against
reversed battery.
The MIC5203 is available in 2.8V, 3.0V, 3.3V, 3.6V, 3.8V,
4.0V, 4.5V, 4.75V, and 5.0V fixed voltages. Other voltages
are available.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• Tiny 4- and 5-lead surface-mount packages
• Wide selection of output voltages
• Guaranteed 80mA output
• Low quiescent current
• Low dropout voltage
• Low temperature coefficient
• Current and thermal limiting
• Reversed input polarity protection
• Zero off-mode current
• Logic-controlled shutdown
• Stability with low-ESR ceramic capacitors
Applications
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery-powered equipment
• Barcode scanners
• SMPS post-regulator/DC-to-DC modules
• High-efficiency linear power supplies
_________________________________________________________________________________________________________________________
Typical Application
Enable
Shutdown
LAxx
V_{O U T}
0.47µF
1
2
Enable
3
Shutdown
5
V_{O U T}
0.47µF
4
SOT-143 Version
SOT-23-5 Version
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
November 2009
M9999-111909