MIC37100/37101/37102
1A Low-Voltage Cap 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,
Cap Regulator, 10F ceramic output capacitor stable
high-current output from an extremely small package.
280mV typical dropout at 1A
Utilizing Micrels proprietary Super eta 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 xed output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are Low ground current
xed 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-prole 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
MIC37100/01/02 to provide 2.5V from a supply as low as LDO linear regulator for PC add-in cards
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-efciency 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
Micrels web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
Dropout
vs. Output Current
350
2.5V
MIC37100
300
OUT
V
IN
IN OUT 2.5V
250
3.3V
200
3.3V
10F OUT
GND
150
ceramic
100
50
0
2.5V/1A Regulator
0 0.25 0.5 0.75 1
OUTPUT CURRENT (A)
Super eta 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 Micrel, Inc. MIC37100/37101/37102
Ordering Information
Part Number Voltage Temperature Range Package
Standard Pb-Free /
RoHS Compliant
MIC37100-1.5BS MIC37100-1.5WS* 1.5V 40 to +125C SOT-223
MIC37100-1.65BS MIC37100-1.65WS* 1.65V 40 to +125C SOT-223
MIC37100-1.8BS MIC37100-1.8WS* 1.8V 40 to +125C SOT-223
MIC37100-2.5BS MIC37100-2.5WS* 2.5V 40 to +125C SOT-223
MIC37100-3.3BS MIC37100-3.3WS* 3.3V 40 to +125C SOT-223
MIC37101-1.5BM MIC37101-1.5YM 1.5V 40 to +125C 8-Pin SOIC
MIC37101-1.65BM MIC37101-1.65YM 1.65V 40 to +125C 8-Pin SOIC
MIC37101-1.8BM MIC37101-1.8YM 1.8V 40 to +125C 8-Pin SOIC
Contact Factory MIC37101-2.1YM 2.1V 40 to +125C 8-Pin SOIC
MIC37101-2.5BM MIC37101-2.5YM 2.5V 40 to +125C 8-Pin SOIC
MIC37101-3.3BM MIC37101-3.3YM 3.3V 40 to +125C 8-Pin SOIC
MIC37102BM MIC37102YM Adj. 40 to +125C 8-Pin SOIC
MIC37102BR MIC37102WR* Adj. 40 to +125C 5-Pin S-PAK
* RoHS compliant with high-melting solder exemption.
Pin Configuration
GND
5 ADJ
TAB
4 OUT
3 GND
2IN
1EN
132
IN GND OUT
SOT-223 (S) 5-Pin S-PAK (R)
MIC37100-x.x (Fixed) MIC37102 (Adjustable)
EN 1 8 GND EN 1 8 GND
IN 2 7 GND IN 2 7 GND
OUT 3 6 GND OUT 3 6 GND
FLG 4 5 GND ADJ 4 5 GND
8-Pin SOIC 8-Pin SOIC
MIC37101-x.x (Fixed) MIC37102 (Adjustable)
M9999-090607
September 2007 2
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