MIC3775 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 750mA UCap Low-Voltage Low-Dropout Regulator

MIC3775
Micrel
MIC3775
750mA µCap Low-Voltage Low-Dropout Regulator
Final
General Description
The MIC3775 is a 750mA low-dropout linear voltage regula-
tors that provides low-voltage, high-current output from an
extremely small package. Utilizing Micrel’s proprietary
Superβeta PNP™ pass element, the MIC3775 offers ex-
tremely low-dropout (typically 280mV at 750mA) and low
ground current (typically 7.5mA at 750mA).
The MIC3775 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 MIC3775 to provide
2.5V from a supply as low as 3.0V and 1.8V or 1.5V from a
supply as low as 2.25V.
The MIC3775 is fully protected with overcurrent limiting,
thermal shutdown, and reversed-leakage protection. Fixed
and adjustable output voltage options are available with an
operating temperature range of –40°C to +125°C.
For other voltages, contact Micrel.
Features
• Fixed and adjustable output voltages to 1.24V
• 280mV 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-leakage protection
• Fast transient response
• Low-profile power MSOP-8 package
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
MIC3775-1.5BMM
MIC3775-1.65BMM
MIC3775-1.8BMM
MIC3775-2.5BMM
MIC3775-3.0BMM
MIC3775-3.3BMM
MIC3775BMM
Voltage
1.5V
1.65V
1.8V
2.5V
3.0V
3.3V
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
Dropout
vs. Output Current
300
V_IN
2.5V
ENABLE
SHUTDOWN
MIC3775BMM
IN OUT
R1
EN ADJ
GND
R2
1.25V
10µF
ceramic
250 _1.8VOUT
200
150
3.3V_OUT
100 _2.5VOUT
1.25V/750mA Adjustable Regulator
Superβeta PNP is a trademark of Micrel, Inc.
PowerPC is a trademark of Motorola
50
0
0
0.25
0.5
0.75
OUTPUT CURRENT (A)
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
March 2003
1
MIC3775