MIC37300/01/02/03
3.0A, Low-Voltage µCap LDO Regulator
General Description
Features
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 over temperature), and low ground current.
• 3.0A minimum guaranteed output current
• 500mV maximum dropout voltage over temperature
− 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 S-Pak fixed voltages
− MIC37301: 5-pin S-Pak or 8-pin ePad SOIC fixed
voltages with flag
− MIC37302: 5-pin adjustable voltage
− MIC37303: 8-pin ePad SOIC, DFN adjustable voltage
with flag
• Excellent line and load regulation specifications
• Thermal-shutdown and current-limit protection
• Reverse-leakage protection
• Low profile S-Pak package
The MIC37300/01/02/03 operates from an input of 2.25V
to 6.0V. It is designed to drive digital circuits requiring lowvoltage 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.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com.
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
Fixed 2.5 Regulator
Adjustable Regulator
Super ßeta 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
February 24, 2015
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Ordering Information
Part number
(1)
Enable
Voltage
Flag
Junction
Temperature
Range
Package
(1)
No
1.5V
No
–40°C to +125°C
S-Pak-3
RoHS Compliant /
Pb-Free
MIC37300-1.5WR
(1)
MIC37300-1.65WR
No
1.65V
No
–40°C to +125°C
S-Pak-3
(1)
No
1.8V
No
–40°C to +125°C
S-Pak-3
(1)
No
2.5V
No
–40°C to +125°C
S-Pak-3
(1)
MIC37300-3.3WR
No
3.3V
No
–40°C to +125°C
S-Pak-3
MIC37301-1.5YME
Yes
1.5V
Yes
–40°C to +125°C
ePad SOIC-8
MIC37301-1.5WR
Yes
1.5V
Yes
–40°C to +125°C
S-Pak-5
MIC37301-1.8YME
Yes
1.8V
Yes
–40°C to +125°C
ePad SOIC-8
MIC37301-1.8WR
Yes
1.8V
Yes
–40°C to +125°C
S-Pak-5
MIC37301-2.5YME
MIC37300-1.8WR
MIC37300-2.5WR
(1)
(1)
Yes
2.5V
Yes
–40°C to +125°C
ePad SOIC-8
(1)
Yes
2.5V
Yes
–40°C to +125°C
S-Pak-5
(1)
MIC37301-2.5WR
MIC37301-3.3WR
Yes
3.3V
Yes
–40°C to +125°C
S-Pak-5
(1)
Yes
ADJ
No
–40°C to +125°C
S-Pak-5
(1)
MIC37302WU
Yes
ADJ
No
–40°C to +125°C
TO-263-5
MIC37303YME
Yes
ADJ
Yes
–40°C to +125°C
ePad SOIC-8
MIC37303YML
Yes
ADJ
Yes
–40°C to +125°C
3mm × 3mm DFN
MIC37302WR
Note:
1. RoHS-compliant with ‘high-melting solder’ exemption.
February 24, 2015
2
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Pin Configuration
S-PAK-5 (R)
(Top View)
S-PAK-3 (R)
(Top View)
5
4
3
2
1
FLG/ADJ
VOUT
GND
VIN
EN
GND 1
8
FLG
EN 2
7
VOUT/ADJ
VIN
3
6
VOUT
VIN
4
5
VOUT
TO-263-5 (U)
(Top View)
e-Pad SOIC-8 (ME)
(Top View)
3mm × 3mm DFN (ML)
(Top View)
Pin Description
Pin Number
S-PAK-5
TO-263-5
Pin Number
S-PAK-3
Pin Number
ePad SOIC-8
DFN
Pin Name
1
—
2
EN
Enable input: CMOS-compatible input. Logic HIGH = enable;
Logic LOW = shutdown. Do not leave floating.
2
1
3, 4
VIN
Input voltage that supplies current to the output power device.
3
2
1
GND
Ground: TAB is connected to ground.
4
3
VOUT
Regulator output.
5 (Fixed)
—
8
FLG
Error flag (output): Open collector output. Active LOW indicates
an output fault condition.
5 (Adj.)
—
7 (Adj.)
ADJ
Adjustable regulator feedback input: Connect to resistor voltage
driver.
—
—
EP
ePad
Connect to GND for best thermal performance.
February 24, 2015
5, 6, 7 (Fixed)
5, 6 (Adj.)
Pin Function
3
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Absolute Maximum Ratings(2)
Supply Voltage (VIN) ...................................................... 6.5V
(4)
Enable Input Voltage (VEN) ......................................... 6.5V
(4)
Power Dissipation (PD) ........................... Internally Limited
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Storage Temperature (TS) ...................–65°C ≤ TJ ≤ +150°C
Lead Temperature (soldering, 10s) ............................ 260°C
(5)
ESD Rating .................................................................. 2kV
Operating Ratings(3)
Supply Voltage (VIN) ................................ 2.25V to 6.0V
Enable Input Voltage (VEN) ........................... 0V to 6.0V
Junction Temperature (TJ) ........... –40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
S-Pak (θJC) ................................................5.5°C/W
TO-263-5 (θJC) ..........................................6.3°C/W
ePad SOIC-8 (θJC) .....................................16°C/W
3mm × 3mm DFN (θJC) ..............................29°C/W
Electrical Characteristics(6)
TA = 25°C with VIN = VOUT + 1V; VEN = VIN; IL = 10mA; bold values indicate –40°C < TJ < +125°C, unless noted.
Parameter
Output Voltage Accuracy
Condition
Min.
IL = 10mA
10mA < IOUT < IL(max), VOUT + 1 ≤ VIN ≤ 6V
Typ.
Max.
Units
-1
+1
%
-2
+2
%
Output Voltage Line Regulation
VIN = VOUT + 1.0V to 6.0V; IL = 10mA
0.02
0.5
%
Output Voltage Load Regulation
IL = 10mA to 3A
0.2
1
%
IL = 1.5A
(ePad SOIC-8, DFN)
175
350
400
mV
IL = 3A
(ePad SOIC-8, DFN)
300
500
550
mV
27
40
50
mA
mA
VIN – VOUT Dropout Voltage
Ground Pin Current
(7)
(8)
IL = 3A
Ground Pin Current in Shutdown
VIL ≤ 0.5V, VIN = VOUT +1V
1.0
5
µA
Current Limit
VOUT = 0V
4.75
6.5
A
Start-Up Time
VEN = VIN, IOUT = 10mA, COUT = 47µF
170
500
µs
Notes:
2. Exceeding the absolute maximum rating may damage the device.
3. The device is not guaranteed to function outside its operating rating.
4. PD(max) = (TJ(max) – TA)/θJA, where θJA, depends upon the printed circuit layout. See “Application Information.”
5. Devices are ESD sensitive. Handling precautions recommended.
6. Specification for packaged product only.
7. VDO = VIN – VOUT when VOUT decreases to 98% of its nominal output voltage with VIN = VOUT + 1V. For output voltages below 1.75, dropout voltage
specification does not apply due to a minimum input operating voltage of 2.25V.
8. IGND is the quiescent current. IIN = IGND + IOUT.
February 24, 2015
4
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Electrical Characteristics(6) (Continued)
TA = 25°C with VIN = VOUT + 1V; VEN = VIN; IL = 10mA; bold values indicate –40°C < TJ < +125°C, unless noted.
Parameter
Condition
Min.
Regulator enable
2.25
Typ.
Max.
Units
Enable Input
Enable Input Threshold
0.8
Regulator shutdown
VIL ≤ 0.8V (Regulator shutdown)
Enable Pin Input Current
VIH ≥ 2.25V (Regulator enable)
1
15
V
2
4
µA
30
75
µA
1
2
µA
400
500
mV
Flag Output
IFLG(LEAK)
VOH = 6V
VFLG(LO)
VIN = 2.25V, IOL = 250µA
(9)
210
Low Threshold, % of VOUT below nominal
VFLG
93
Hysteresis
2
High Threshold, % of VOUT below nominal
%
99.2
MIC37302 Only
1.228
1.215
Reference Voltage
Adjust Pin Bias Current
1.240
1.252
1.265
V
40
80
120
nA
Note:
9. For a 2.5V device, VIN = 2.250V (device is in dropout).
February 24, 2015
5
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Typical Characteristics
February 24, 2015
6
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Typical Characteristics (Continued)
February 24, 2015
7
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Functional Characteristics
February 24, 2015
8
Revision 2.0
Micrel, Inc.
MIC37300/01/02/03
Applications Information
Then the heat sink thermal resistance is determined
with Equation 2:
The MIC37300/01/02/03 is a high-performance lowdropout voltage regulator suitable for moderate to
high-current regulator applications. Its 500mV dropout
voltage at full load and over temperature makes it
especially valuable in battery-powered systems and
as high-efficiency noise filters in post-regulator
applications. Unlike older NPN-pass transistor
designs, where the minimum dropout voltage is limited
by the based-to-emitter voltage drop and collector-toemitter saturation voltage, dropout performance of the
PNP output of these devices is limited only by the low
VCE saturation voltage.
θSA = ((TJ(max) – TA)/PD) – (θJC + θCS)
where TJ(max)