MIC37100/37101/37102
1A Low-Voltage µCap LDO
General Description
Features
The MIC37100, MIC37101, and MIC37102 are 1A low• Fixed and adjustable output voltages to 1.24V
dropout, linear voltage regulators that provide low-voltage,
• µCap Regulator, 10µF ceramic output capacitor stable
high-current output from an extremely small package.
• 280mV typical dropout at 1A
Utilizing Micrel’s proprietary Super βeta PNP® pass
– Ideal for 3.0V to 2.5V conversion
element, the MIC37100/01/02 offers extremely low dropout
– Ideal for 2.5V to 1.8V, 1.65V or 1.5V conversion
(typically 280mV at 1A) and low ground current (typically
• 1A minimum guaranteed output current
11mA at 1A).
• 1% initial accuracy
The MIC37100 is a fixed output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are
• Low ground current
fixed and adjustable regulators, respectively, in a thermally
• Current limiting and thermal shutdown
enhanced power 8-pin SOIC (small outline package) and
• Reversed-leakage protection
the SOT-223 package. The MIC37102 is also available in
• Fast transient response
the S-PAK power package, for applications that require
• Low-profile SOT-223 package
higher power dissipation or higher operating ambient
• Power SO-8 package
temperatures.
• S-PAK package (MIC37102 only)
The MIC37100/01/02 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 or lower. A guaranteed maximum dropout
Applications
voltage of 500mV over all operating conditions allows the
• LDO linear regulator for PC add-in cards
MIC37100/01/02 to provide 2.5V from a supply as low as
3V and 1.8V from a supply as low as 2.3V.
• PowerPC® power supplies
The MIC37100/01/02 is fully protected with overcurrent
• High-efficiency linear power supplies
limiting and thermal shutdown. Fixed output voltages of
• SMPS post regulator
1.5V, 1.65V, 1.8V, 2.5V and 3.3V are available on
• Multimedia and PC processor supplies
MIC37100/01 with adjustable output voltages to 1.24V on
• Battery chargers
MIC37102.
• Low-voltage microcontrollers and digital logic
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
350
GND
300
2.5V
10F
ceramic
DROPOUT (mV)
VIN
3.3V
MIC37100
OUT
IN
Dropout
vs. Output Current
2.5VOUT
250
200
150
3.3VOUT
100
50
2.5V/1A Regulator
0
0
0.25
0.5
0.75
OUTPUT CURRENT (A)
1
Super βeta PNP is a registered trademark of Micrel, Inc.
PowerPC is a registered trademark of IBM Corporation
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2007
M9999-090607
