MIC39100_05 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 1A Low-Voltage Low-Dropout Regulator

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. Utilizing Micrel’s pro-
prietary 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 SOIC 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 limit-
ing, 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.
For other voltages, contact Micrel.
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
Typical Applications
V_IN
3.3V
MIC39100
IN OUT
GND
2.5V
10µF
tantalum
V_IN
3.3V
ENABLE
SHUTDOWN
100k
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
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
Super βeta PNP is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
August 2005
1
M9999-082505-B