MIC3975 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 750mA UCap Low-Voltage Low-Dropout Regulator

MIC3975
Micrel
MIC3975
750mA µCap Low-Voltage Low-Dropout Regulator
Final Information
General Description
The MIC3975 is a 750mA low-dropout linear voltage regula-
tors that provide low-voltage, high-current output from an
extremely small package. Utilizing Micrel’s proprietary Super
βeta PNP™ pass element, the MIC3975 offers extremely low
dropout (typically 300mV at 750mA) and low ground current
(typically 6.5mA at 750mA).
The MIC3975 is ideal for PC add-in cards that need to convert
from standard 5V to 3.3V or 3.0V, 3.3V to 2.5V or 2.5V to 1.8V
or 1.65V. A guaranteed maximum dropout voltage of 500mV
over all operating conditions allows the MIC3975 to provide
2.5V from a supply as low as 3.0V and 1.8V or 1.65V from a
supply as low as 2.25V.
The MIC3975 is fully protected with overcurrent limiting,
thermal shutdown, and reversed-battery protection. Fixed
voltages of 5.0V, 3.3V, 3.0, 2.5V, 1.8V, and 1.65V are
available. An adjustable output voltage option is available for
voltages down to 1.24V.
For other voltages, contact Micrel.
Features
• Fixed and adjustable output voltages to 1.24V
• 300mV typical dropout at 750mA
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V or 1.65V conversion
• Stable with ceramic capacitor
• 750mA 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 MSOP-8
Applications
• Fiber optic modules
• 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
Ordering Information
Part Number
MIC3975-1.65BMM
MIC3975-1.8BMM
MIC3975-2.5BMM
MIC3975-3.0BMM
MIC3975-3.3BMM
MIC3975-5.0BMM
MIC3975BMM
Voltage
1.65V
1.8V
2.5V
3.0V
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
Package
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
Typical Applications
V_IN
3.3V
ENABLE
SHUTDOWN
100k
MIC3975-2.5BMM
IN OUT
R1
EN FLG
GND
Error
Flag
Output
2.5V
10µF
ceramic
V_IN
2.5V
ENABLE
SHUTDOWN
MIC3975BMM
IN OUT
R1
EN ADJ
GND
R2
1.5V
10µF
ceramic
2.5V/750mA Regulator with Error Flag
1.5V/750mA Adjustable Regulator
Super βeta PNP is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
February 2003
1
MIC3975