MIC2954_07 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 250mA Low-Dropout Regulator

MIC2954
250mA Low-Dropout Regulator
General Description
Features
The MIC2954 is a “bulletproof” efficient voltage regulator • High-accuracy 5V, guaranteed 250mA output
with very low dropout voltage (typically 40mV @ light loads
and 375mV @ 250mA), and low quiescent current (120µA
typical). The quiescent current of the MIC2954 increases
only slightly in dropout, thus prolonging battery life. Key
MIC2954 features include protection against reversed
battery, fold-back current limiting, and automotive load
dump protection (60V positive transient).
The MIC2954-07/08BM is an adjustable version that
includes an error flag output that warns of a low output
voltage, which is often due to failing batteries on the input.
This may also be used as a power-on reset. A logic-
compatible shutdown input is provided which enables the
regulator to be switched on and off. This part may be pin-
strapped for 5V output, or programmed from 1.24V to 29V
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input can withstand –20V reverse battery and+60V
positive transients
• Error flag warns of low output voltage
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 29V
(MIC2954-07/08)
• Available in TO-220, TO-92, and surface-mount SOT-
223 and SOIC-8 packages
with the use of two external resistors.
The MIC2954 is available in two voltage tolerances, ±0.5% ^Applications
maximum and ±1% maximum. Both are guaranteed for
junction temperatures from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• Battery powered equipment
• Cellular telephones
• Laptop, notebook, and palmtop computers
• PCMCIA V_CC and V_PP regulation/switching
• Bar code scanners
• Automotive electronics
• SMPS post-regulator/dc-to-dc modules
• Voltage reference
• High-efficiency linear power supplies
___________________________________________________________________________________________________________
Ordering Information
Part Number
Standard
Pb-Free /
RoHS Compliant
Accuracy
Junction
Temp. Range
Package
MIC2954-02BT MIC2954-02WT*
0.5%
–40° to +125°C
TO-220-3
MIC2954-03BT MIC2954-03WT*
1.0%
–40° to +125°C
TO-220-3
MIC2954-02BS MIC2954-02WS*
0.5%
–40° to +125°C
SOT-223-3
MIC2954-03BS MIC2954-03WS*
1.0%
–40° to +125°C
SOT-223-3
MIC2954-02BZ MIC2954-02YZ
0.5%
–40° to +125°C
TO-92-3**
MIC2954-03BZ MIC2954-03YZ
1.0%
–40° to +125°C
TO-92-3**
MIC2954-07BM MIC2954-07YM
0.5%
–40° to +125°C
8-Pin SOIC
MIC2954-08BM MIC2954-08YM
1.0%
–40° to +125°C
8-Pin SOIC
* RoHS compliant with ‘high-melting solder’ exemption.
** TO-92 package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007.
Contact factory for additional information.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 2007
M9999-090607