MIC37100/37101/37102
Micrel
MIC37100/37101/37102
1A Low-Voltage µCap LDO Regulator
General Description
Features
The MIC37100, MIC37101, and MIC37102 are 1A low-
dropout, linear voltage regulators that provide low-voltage,
high-current output from an extremely small package. Utiliz-
ing Micrel’s proprietary Super βeta PNP™ pass element, the
MIC37100/01/02 offers extremely low dropout (typically
280mV at 1A) and low ground current (typically 11mA at 1A).
• Fixed and adjustable output voltages to 1.24V
• µCap Regulator, 10µF ceramic output capacitor
stable
• 280mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V, 1.65V or 1.5V conversion
• 1A minimum guaranteed output current
• 1% initial accuracy
The MIC37100 is a fixed output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are fixed
and adjustable regulators, respectively, in a thermally en-
hanced power 8-lead SOIC (small outline package) and the
SOT-223 package. The MIC37102 is also available in the S-
PAK power package, for applications that require higher
power dissipation or higher operating ambient temperatures.
• Low ground current
• Current limiting and thermal shutdown
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
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 voltage of
500mV over all operating conditions allows the
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.
• S-PAK package (MIC37102 only)
Applications
• LDO linear regulator for PC add-in cards
• PowerPC™ power supplies
The MIC37100/01/02 is fully protected with overcurrent lim-
iting and thermal shutdown. Fixed output voltages of 1.5V,
1.65V, 1.8V, 2.5V and 3.3V are available on MIC37100/01
with adjustable output voltages to 1.24V on MIC37102.
• High-efficiency linear power supplies
• SMPS post regulator
• Multimedia and PC processor supplies
• Battery chargers
• Low-voltage microcontrollers and digital logic
For other voltages, contact Micrel.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Typical Applications
Dropout
vs. Output Current
350
2.5VOUT
300
250
200
150
100
50
MIC37100
VIN
3.3V
IN
OUT
2.5V
10µF
ceramic
GND
3.3VOUT
2.5V/1A Regulator
0
0
0.25
0.5
0.75
1
OUTPUT CURRENT (A)
Super βeta PNP is a registered trademark of Micrel, Inc.
PowerPC is a trademark of IBM Corporation.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-091604
September 2004
1
MICREL [ MICREL SEMICONDUCTOR ]
