MIC37300/01/02/03
3.0A, Low-Voltage µCap LDO Regulator
General Description
The Micrel MIC37300/01/02/03 is a 3.0A low-dropout
linear voltage regulator that provides a low-voltage,
high-current output with a minimum number of external
components. It offers high precision, ultra-low-dropout
(500mV overtemperature), and low-ground current.
The MIC37300/01/02/03 operates from an input of
2.25V to 6.0V. It is designed to drive digital circuits
requiring low-voltage at high currents (i.e., PLDs, DSP,
microcontroller, etc.). It is available in
fixed
and
adjustable output voltages. Fixed voltages include 1.5V,
1.8V, 2.5V and 3.3V. The adjustable version is capable
of 1.24V to 5.5V.
Features of the MIC37300/01/02/03 LDO include
thermal and current-limit protection, and reverse-current
protection. Logic enable and error
flag
pins are available
on the 5-pin version.
Junction temperature range of the MIC37300/01/02/03
is from–40°C to +125°C.
For applications requiring input voltage greater than
6.0V, see the MIC3910x, MIC3915x, MIC3930x, and
MIC3950x LDOs.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
•
3.0A minimum guaranteed output current
•
500mV maximum dropout-voltage overtemperature
–
Ideal for 3.0V to 2.5V conversion
–
Ideal for 2.5V to 1.8V, 1.65V, or 1.5V conversion
•
Stable with ceramic or tantalum capacitor
•
Wide input voltage range
– VIN: 2.25V to 6.0V
•
+1.0% initial output tolerance
•
Fixed and adjustable output voltages:
– MIC37300—3-pin
fixed
voltages
– MIC37301—5-pin S-Pak or 8-pin e-Pad SOIC
fixed
voltages with
flag
– MIC37302—5-pin adjustable voltage
– MIC37303—8-pin e-Pad SOIC adjustable
voltage with flag
•
Excellent line and load regulation specifications
•
Thermal shutdown and current-limit protection
•
Reverse-leakage protection
•
Low profile S-Pak package
Applications
•
•
•
•
•
LDO linear regulator for low-voltage digital IC
PC add-in cards
High-efficiency linear power supplies
SMPS post regulator
Battery charger
Typical Application
V
IN
= 3.0V
MIC37300
VIN
VOUT
V
OUT
= 2.5V
C
OUT
47µF, Ceramic
GND
V
IN
C
IN
MIC37302
VIN
VOUT
R1
VEN
GND
ADJ
R2
1.3V
C
OUT
47µF, Ceramic
Fixed 2.5V Regulator
Super ßeta PNP is a registered trademarks of Micrel, Inc.
Adjustable Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2009
1
M9999-102909
Micrel, Inc.
MIC37300/01/02/03
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 6.5V
Enable Input Voltage (V
EN
)
(3)
................................ 6.5V
Power Dissipation (P
D
)
(3)
.................. Internally Limited
Junction Temperature (T
J
).......... –40°C
≤
T
J
≤
+125°C
Storage Temperature (T
S
) .......... –65°C
≤
T
J
≤
+150°C
Lead Temperature (soldering, 5sec) ..................260°C
ESD Rating
(4)
..........................................................2kV
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
Package Thermal Resistance
S-Pak (θ
JC
) .................................................. 2°C/W
TO-263-5 (θ
JC
)............................................. 2°C/W
e-Pad SOIC-8 (θ
JC
) ................................... 10°C/W
Electrical Characteristics
(5)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
EN
= V
IN
; I
L
= 10mA;
bold
values indicate –40°C < T
J
< +125°C, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line Regulation
Output Voltage Load Regulation
V
IN
– V
OUT
Dropout Voltage
(6)
Conditions
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
I
L
= 10mA to 3A
I
L
= 1.5A
(e-Pad SOIC-8)
I
L
= 3A
(e-Pad SOIC-8)
I
L
= 3A
V
IL
≤
0.5V, V
IN
= V
OUT
+1V
V
OUT
= 0V
V
EN
= V
iN
, I
OUT
= 10mA, C
OUT
= 47µF
Regulator enable
Regulator shutdown
V
IL
≤
0.8V (Regulator shutdown)
V
IH
≥
2.25V (Regulator enable)
Min
-1
-2
Typ
Max
+1
+2
Units
%
%
%
%
mV
mV
mA
mA
µA
A
µs
V
V
µA
µA
µA
µA
µA
µA
mV
mV
%
%
%
V
V
nA
nA
0.02
0.2
175
300
27
1.0
4.75
170
Ground Pin Current
(7)
Ground Pin Current in Shutdown
Current Limit
Start-up Time
Enable Input
Enable Input Threshold
Enable pin Input Current
0.5
1
350
400
500
550
40
50
5
6.5
500
2.25
0.8
2
4
30
75
1
2
400
500
1
15
Flag Output
I
FLG(LEAK)
V
FLG(LO)
V
FLG
V
OH
= 6V
V
IN
= 2.25V, I
OL
= 250µA
(8)
Low Threshold, % of VOUT below nominal
Hysteresis
High Threshold, % of VOUT below nominal
93
2
210
99.2
1.228
1.215
1.240
40
1.252
1.265
80
120
MIC37302 Only
Reference Voltage
Adjust Pin Bias Current
October 2009
4
M9999-102909
Micrel, Inc.
MIC37300/01/02/03
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
, where
θ
JA
, depends upon the printed circuit layout. See “Applicatins Information.”
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. V
DO
= V
IN
– V
OUT
when V
OUT
decreases to 98% of its nominal output voltage with V
IN
= V
OUT
+ 1V. For output voltages below 1.75, 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
.
8. For a 2.5V device, V
IN
= 2.250V (device is in dropout).
October 2009
5
M9999-102909
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