MIC39100/39101/39102
Micrel
MIC39100/39101/39102
1A Low-Voltage Low-Dropout Regulator
General Description
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).
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).
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. A guaranteed maximum dropout voltage of 630mV over
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.
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.
Features
• 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
• Current limiting and thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
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
Low-voltage microcontrollers and digital logic
For other voltages, contact Micrel.
Ordering Information
Part Number
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
Voltage
1.8V
2.5V
3.3V
5.0V
1.8V
2.5V
3.3V
5.0V
Adj.
Junction Temp. Range
–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
Package
SOT-223
SOT-223
SOT-223
SOT-223
SOP-8
SOP-8
SOP-8
SOP-8
SOP-8
Typical Applications
100k
V
IN
3.3V
MIC39100
IN
OUT
GND
2.5V
10µF
tantalum
V
IN
3.3V
ENABLE
SHUTDOWN
MIC39101
IN
OUT
R1
EN
FLG
GND
Error
Flag
Output
2.5V
10µF
tantalum
V
IN
2.5V
ENABLE
SHUTDOWN
MIC39102
IN
OUT
R1
EN
ADJ
GND
R2
1.5V
10µF
tantalum
2.5V/1A Regulator
Super
βeta
PNP is a trademark of Micrel, Inc.
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
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 ]
