MIC39100/39101/39102
Micrel
MIC39100/39101/39102
1A Low-Voltage Low-Dropout Regulator
General Description
Features
The MIC39100, MIC39101, and MIC39102 are 1A low-
dropout linear voltage regulators that provide low-voltage,
high-current output from an extremely small package. Utiliz-
ing Micrel’s proprietary Super βeta PNP™ pass element, the
MIC39100/1/2 offers extremely low dropout (typically 410mV
at 1A) and low ground current (typically 11mA at 1A).
• Fixed and adjustable output voltages to 1.24V
• 410mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V conversion
• 1A minimum guaranteed output current
• 1% initial accuracy
• Low ground current
The MIC39100 is a fixed output regulator offered in the
SOT-223 package. The MIC39101 and MIC39102 are fixed
and adjustable regulators, respectively, in a thermally en-
hanced power 8-lead SOP (small outline package).
• Current limiting and thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
The MIC39100/1/2 is ideal for PC add-in cards that need to
convert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to
1.8V.Aguaranteedmaximumdropoutvoltageof630mVover
all operating conditions allows the MIC39100/1/2 to provide
2.5V from a supply as low as 3.13V and 1.8V from a supply
as low as 2.43V.
Applications
• LDO linear regulator for PC add-in cards
• PowerPC™ power supplies
• High-efficiency linear power supplies
• SMPS post regulator
• Multimedia and PC processor supplies
• Battery chargers
The MIC39100/1/2 is fully protected with overcurrent limiting,
thermal shutdown, and reversed-battery protection. Fixed
voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available on
MIC39100/1 with adjustable output voltages to 1.24V on
MIC39102.
• Low-voltage microcontrollers and digital logic
For other voltages, contact Micrel.
Ordering Information
Part Number
Voltage Junction Temp. Range
Package
MIC39100-1.8BS
MIC39100-2.5BS
MIC39100-3.3BS
MIC39100-5.0BS
MIC39101-1.8BM
MIC39101-2.5BM
MIC39101-3.3BM
MIC39101-5.0BM
MIC39102BM
1.8V
2.5V
3.3V
5.0V
1.8V
2.5V
3.3V
5.0V
Adj.
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
SOT-223
SOT-223
SOT-223
SOT-223
SOP-8
SOP-8
SOP-8
SOP-8
SOP-8
Typical Applications
100k
Error
Flag
Output
MIC39100
MIC39101
MIC39102
VIN
3.3V
VIN
3.3V
VIN
2.5V
IN
OUT
2.5V
IN
OUT
2.5V
IN
OUT
1.5V
R1
R1
ENABLE
SHUTDOWN
ENABLE
SHUTDOWN
EN
FLG
EN
ADJ
10µF
tantalum
10µF
tantalum
10µF
tantalum
GND
R2
GND
GND
2.5V/1A Regulator
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
Super βeta PNP is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
1
MIC39100/39101/39102
MICREL [ MICREL SEMICONDUCTOR ]
