MIC5271 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – μCap Negative Low-Dropout Regulator

MIC5271
Micrel
MIC5271
µCap Negative Low-Dropout Regulator
General Description
The MIC5271 is a µCap 100mA negative regulator in a
SOT-23-5 package. With better than 2% initial accuracy, this
regulator provides a very accurate supply voltage for applica-
tions that require a negative rail. The MIC5271 sinks 100mA
of output current at very low dropout voltage (600mV maxi-
mum at 100mA of output current).
The µCap regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The output typically re-
quires only a 1µF capacitance for stability.
Designed for applications where small packaging and effi-
ciency are critical, the MIC5271 combines LDO design exper-
tise with IttyBitty^ packaging to improve performance and
reduce power dissipation. Ground current is optimized to help
improve battery life in portable applications. The MIC5271
also includes a TTL-compatible enable pin, allowing the user
to put the part into a zero-current off-mode.
The MIC5271 is available in the SOT-23-5 package for space
saving applications and it is available with an adjustable
output.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• Stable with ceramic or tantalum capacitor
• Positive and negative enable thresholds
• Low dropout voltage: 500mV @ 100mA
• Low ground current: 35µA @ load = 100µA
• Tight initial accuracy: ±2%
• Tight load and line regulation
• Thermal shutdown
• Current limiting
• IttyBitty^ SOT-23-5 packaging
• Zero-current off-mode
Applications
• GaAsFET bias
• Portable cameras and video recorders
• PDAs
• Battery-powered equipment
• Post-regulation of DC-DC converters
Ordering Information
Part Number
Marking Voltage* Junction Temp. Range
MIC5271BM5
L9AA
Adj.
–40°C to +125°C
MIC5271-3.0BM5
L930
–3.0V
–40°C to +125°C
MIC5271-5.0BM5
L950
–5.0V
–40°C to +125°C
* For other voltage options, please contact Micrel Marketing.
Package
SOT-23-5
SOT-23-5
SOT-23-5
Typical Application
V_IN
–6.0V
MIC5271BM5
2 _{GND ADJ} 3
1 _EN
5
4
–IN –OUT
1µF
10µF
R1
R2
V_OUT
–5.0V
Enable Input
5
4
3
Regulator On
2
1
0
Regulator Off
-1
-2
-3
Regulator On
-4
-5-3 _{-5 -7 -9 -11 -13 -15}
SUPPLY VOLTAGE (V)
Regulator With Adjustable Output
IttyBitty is a registered trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
October 2003
1
MIC5271