MIC3975_05 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 750mA μCap Low-Voltage Low-Dropout Regulator

MIC3975
Micrel
MIC3975
750mA µCap Low-Voltage Low-Dropout Regulator
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 con-
vert 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 avail-
able. 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
Standard
Pb-Free
MIC3975-1.65BMM
MIC3975-1.65YMM
MIC3975-1.8BMM
MIC3975-1.8YMM
MIC3975-2.5BMM
MIC3975-2.5YMM
MIC3975-3.0BMM
MIC3975-3.0YMM
MIC3975-3.3BMM
MIC3975-3.3YMM
MIC3975-5.0BMM
MIC3975-5.0YMM
MIC3975BMM
MIC3975YMM
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
10F
ceramic
V_IN
2.5V
ENABLE
SHUTDOWN
MIC3975BMM
IN OUT
R1
EN ADJ
GND
R2
1.5V
10F
ceramic
2.5V/750mA Regulator with Error Flag
1.5V/750mA 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
February 2005
1
MIC3975