MIC39100/1/2
1A, Low-Voltage, Low-Dropout Regulator
General Description
The MIC39100, MIC39101, and MIC39102 are 1A low-
dropout linear voltage regulators that provide low-voltage,
high-current output from an extremely small package.
Utilizing Micrel’s proprietary Super
βeta
PNP
®
pass
element, the MIC39100/1/2 offers extremely low dropout
(typically 410mV at 1A) and low ground current (typically
11mA at 1A).
The MIC39100 is a fixed output regulator offered in the
SOT-223 package. The MIC39101 and MIC39102 are
fixed and adjustable regulators, respectively, in a thermally
enhanced power 8-lead SOIC package.
The MIC39100/1/2 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. A guaranteed maximum dropout voltage of 630mV
over all operating conditions allows the MIC39100/1/2 to
provide 2.5V from a supply as low as 3.13V and 1.8V from
a supply as low as 2.43V.
The MIC39100/1/2 is fully protected with overcurrent
limiting, thermal-shutdown, and reverse-battery protection.
Fixed voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available
on MIC39100/1 with adjustable output voltages to 1.24V
on MIC39102.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
Fixed and adjustable output voltages to 1.24V
•
410mV typical dropout at 1A
−
Ideal for 3.0V to 2.5V conversion
−
Ideal for 2.5V to 1.8V conversion
•
1A minimum guaranteed output current
•
1% initial accuracy
•
Low ground current
•
Current-limiting and thermal-shutdown protection
•
Reversed-battery and reversed-leakage protection
•
Fast transient response
•
Low-profile SOT-223 package
•
Power SO-8 package
Applications
•
•
•
•
•
•
LDO linear regulator for PC add-in cards
High-efficiency linear power supplies
SMPS post regulator
Multimedia and PC processor supplies
Battery chargers
Low-voltage microcontrollers and digital logic
Typical Applications
2.5V/1A Regulator
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
Super
βeta
PNP is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
June 3, 2015
Revision 3.0
Micrel, Inc.
MIC39100/1/2
Absolute Maximum Ratings
(2)
Supply Voltage (V
IN
) .......................................
−20V
to +20V
Enable Voltage (V
EN
) .................................................... +20V
Lead Temperature (soldering, 5s) .............................. 260°C
Storage Temperature (T
S
) .........................
−65°C
to +150°C
ESD Rating.................................................................Note
5
Operating Ratings
(3)
Supply Voltage (V
IN
) .................................... +2.25V to +16V
Enable Voltage (V
EN
) .................................................... +16V
Maximum Power Dissipation (P
D(MAX)
) .......................
Note 4
Junction Temperature (T
J
) ........................
−40°C
to +125°C
Package Thermal Resistance
SOT-223 (θ
JC
) .................................................. +15°C/W
SOIC-8 (θ
JC
)..................................................... +20°C/W
Electrical Characteristics
(6)
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted.
Symbol
V
OUT
Parameter
Output Voltage
Line Regulation
Load Regulation
∆V
OUT
/∆T
Output Voltage Temperature
Coefficient
(7)
I
OUT
= 100mA,
∆V
OUT
=
−1%
Dropout Voltage
(8)
I
OUT
= 500mA,
∆V
OUT
=
−1%
I
OUT
= 750mA,
∆V
OUT
=
−1%
I
OUT
= 1A,
∆V
OUT
=
−1%
I
OUT
= 100mA, V
IN
= V
OUT
+ 1V
I
GND
Ground Current
(9)
I
OUT
= 500mA, V
IN
= V
OUT
+ 1V
I
OUT
= 750mA, V
IN
= V
OUT
+ 1V
I
OUT
= 1A, V
IN
= V
OUT
+ 1V
I
OUT(LIM)
Notes:
2. Exceeding the absolute maximum ratings may damage the device.
3. The device is not guaranteed to function outside its operating ratings.
4. P
D(MAX)
= (T
J(MAX)
−
T
A
) ÷
θ
JA
, where
θ
JA
depends upon the printed circuit layout (see
Applications Information).
5. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
6. Specification for packaged product only.
7. Output voltage temperature coefficient is
∆V
OUT(WORST CASE)
÷ (T
J(MAX)
−
TJ
(MIN)
), where T
J(MAX)
= +125°C and T
J(MIN)
=
−40°C.
8. V
DO
= V
IN
– V
OUT
when V
OUT
decreases to 99% of its nominal output voltage with V
IN
= V
OUT
+ 1V. For output voltages below 2.25V, dropout voltage is
the input-to-output voltage differential with the minimum input voltage being 2.25V. Minimum input operating voltage is 2.25V.
9. I
GND
is the quiescent current (I
IN
= I
GND
+ I
OUT
).
Condition
10mA
10mA
≤
I
OUT
≤
1A, V
OUT
+1V
≤
V
IN
≤
8V
I
OUT
= 10mA, V
OUT
+ 1V
≤
V
IN
≤
16V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
1A
Min.
−1
−2
Typ.
Max.
+1
+2
Units
%
%
%
ppm/°C
0.06
0.2
40
140
275
300
410
400
4
6.5
11
1.8
0.5
1
100
200
250
V
DO
500
550
630
mV
µA
mA
20
2.5
A
Current Limit
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
June 3, 2015
4
Revision 3.0
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