MIC37139
1.5A, Low-Voltage µCap LDO Regulator
General Description
The Micrel MIC37139 is a 1.5A low-dropout linear voltage
regulator that provides a low-voltage, high-current output
with a minimum of external components. It offers high
precision, ultra-low dropout (500mV overtemperature), and
low ground current.
The MIC37139 operates from an input of 2.25V to 6.0V. It
is designed for a wide variety of applications including
digital circuits requiring low-voltage at high currents (i.e.,
PLDs, DSPs, microcontrollers, etc.). It is available in a
fixed output voltage of 1.8V, and as low as 1.5V.
Features of the MIC37139 LDO include thermal and
current-limit protection, and reverse-current and reverse-
battery protection. It’s junction temperature range of the is
from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
1.5A minimum guaranteed output current
500mV maximum dropout voltage over temperature
Stable with ceramic or tantalum capacitor
Wide input voltage range: V
IN
:2.25V to 6.0V
+1.0% initial output tolerance
Fixed 1.8V output voltage
Excellent line and load regulation specifications
Thermal shutdown and current-limit protection
Reverse-leakage protection
Low profile SOT-223 package
Applications
•
•
•
•
•
•
•
•
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LDO linear regulator for low-voltage digital IC
PC add-in cards
High-efficiency linear power supplies
SMPS post regulator
Battery charger
Set-top boxes
Digital video recorders
PowerPC
®
power supplies
Multimedia and PC processor supplies
___________________________________________________________________________________________________________
Typical Application
1.8V/1.5A Regulator
Super
βeta
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
November 2009
M9999-110209
Micrel, Inc.
MIC37139
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ......................................................6.5V
Enable Input Voltage (V
EN
)............................................6.5V
Power Dissipation .....................................Internally Limited
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature (T
s
) ...................–65°C
≤
T
J
≤
+150°C
ESD Rating
(3)
Operating Ratings
(2)
Supply Voltage (V
IN
)....................................... 2.25V to 6.0V
Enable Input Voltage (V
EN
).................................. 0V to 6.0V
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Maximum Power Dissipation
(4)
Package Thermal Resistance
SOT-223 (θ
JC
) ....................................................50°C/W
Electrical Characteristics
(5)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
EN
= V
IN
;
bold
values indicate –40°C< T
J
< +125°C, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line Regulation
Output Voltage Load Regulation
VIN – VOUT; Dropout Voltage
Ground Pin Current
(7)
Ground Pin Current in Shutdown
Current Limit
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. P
D(max)
= (T
J(max)
– T
A
) ÷
θ
JA
, where
θ
JA
, depends upon the printed circuit layout. See “Applications Information.”
5. Specification for packaged product only.
6. V
DO
= V
IN
– V
OUT
when V
OUT
decreased to 98% of its nominal output voltage with V
IN
= V
OUT
+1V. For output voltages below 1.75V, dropout voltage
specification does not apply due to a minimum input operating voltage of 2.25V.
7. I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
(6)
Condition
I
L
= 10mA
10mA < I
OUT
< I
L(max)
, V
OUT
+ 1
≤
V
IN
≤
6V
V
IN
= V
OUT
+1.0V to 6.0V
I
L
= 10mA to 1.5A
I
L
= 750mA
I
L
= 1.5A
I
L
= 1.5A
V
IL
≤
0.5V, V
IN
= V
OUT
+ 1V
V
OUT
= 0
Min
–1
–2
Typ
Max
+1
+2
Units
%
%
%
%
mV
mV
mA
µA
A
0.06
0.2
0.5
1
350
500
17
1.0
2.25
30
4
November 2009
3
M9999-110209
嵌入式系统
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