MIC37501/37502
5A, Low Voltage
μCap
LDO Regulator
General Description
The MIC37501 and MIC37502 are 5A, low dropout
linear voltage regulator that provide low voltage, high
current outputs with a minimum of external components.
They offer high precision, ultra-low dropout (500mV),
and low ground current.
The MIC37501and MIC37502 operate from an input of
2.3V to 6.0V. They are designed to drive digital circuits
requiring low voltage at high currents (i.e., PLDs, DSPs,
microcontrollers, etc.). They are available in fixed and
adjustable output voltages. Fixed voltages include 1.5V,
1.65V, 1.8V, 2.5V, and 3.3V. The adjustable version is
capable of 1.24V to 5.5V.
MIC37501 and MIC37502 LDOs feature thermal and
currentlimit protection and reverse current protection.
Logic enable and error flag pins are available.
Junction temperature range of the MIC37501/02 is from
–40°C to 125°C.
For applications requiring input voltage greater than
6.0V, see MIC3910x, MIC3915x, MIC3930x, and
MIC3950x LDOs.
All support documentation can be found on Micrel’s web
site at
www.micrel.com.
Features
•
5A minimum guaranteed output current
•
500mV maximum dropout voltage
–
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:
-
V
IN
: 2.3V to 6.0V
•
±1.0% initial output tolerance
•
Fixed and adjustable output voltages:
– MIC37501—7 terminal fixed voltage
– MIC37502—5 (TO-263) and 7 (SPAK) terminal
adjustable voltage
•
Excellent line and load regulation specifications
•
Logic controlled shutdown
•
Thermal shutdown and current-limit protection
•
Reverse-leakage protection
•
Low profile S-Pak and TO-263 packages
Applications
•
•
•
•
•
LDO linear regulator for low-voltage digital IC
PC add-in cards
High efficiency linear power supplies
SMPS post regulator
Battery charger
Typical Applications
V
IN
= 3.0V
C
IN
MIC37501
VIN
VIN
VEN
GND
DROPOUT (mV)
VOUT
VOUT
FLG
100k
V
OUT
= 2.5V
C
OUT
100F, Ceramic
450
400
350
300
250
200
150
100
50
0
Dropout
vs. Output Current
Fixed 2.5V Regulator with Error Flag
V
IN
C
IN
MIC37502
VIN
VIN
VEN
GND
VOUT
VOUT
ADJ
R2
R1
1.3V
2.5V
OUT
C
OUT
100F, Ceramic
012345
OUTPUT CURRENT (A)
Adjustable Regulator
Super
βeta
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
May 2011
1
M9999-050511-B
Micrel, Inc.
MIC37501/37502
Ordering Information
Part Number
Standard
MIC37501-1.5BR
MIC37501-1.65BR
MIC37501-1.8BR
MIC37501-2.5BR
MIC37501-3.3BR
MIC37502BR
MIC37502BU
Notes:
1.
2.
RoHS compliant with “high-melting solder” exemption.
Other Voltage available. Contact Micrel for detail.
RoHS Compliant
MIC37501-1.5WR
MIC37501-1.65WR
MIC37501-1.8WR
MIC37501-2.5WR
MIC37501-3.3WR
MIC37502WR
MIC37502WU
(1)
Output
Current
5A
5A
5A
5A
5A
5A
5A
Voltage
(2)
1.5V
1.65V
1.8V
2.5V
3.3V
Adj.
Adj.
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
S-Pak-7
S-Pak-7
S-Pak-7
S-Pak-7
S-Pak-7
S-Pak-7
To-263-5
Pin Configuration
5
4
3
2
1
TO-263-5
ADJ
VOUT
GND
VIN
EN
7
6
5
4
3
2
1
FLG/ADJ
VOUT
VOUT
GND
VIN
VIN
EN
TAB
TAB
S-PAK-7
Pin Description
Pin Number
TO-263-5
Pin Number
S-PAK-7
Pin Name
Pin Name
1
2
3
4
—
5
1
2, 3
4
5, 6
7
7
EN
VIN
GND
VOUT
FLG
ADJ
Enable (input): CMOS-compatible input. Logic high = enable, logic
low = shutdown.
Input voltage which supplies current to the output power device.
Connect pins 2 and 3 together externally.
Ground (TAB is connected to ground).
Regulator Output: Connect pins 5 and 6 together externally.
Error Flag (output): Open collector output. Active low indicates an
output fault condition.
Adjustable regulator feedback input. Connect to resistor voltage
divider.
May 2011
2
M9999-050511-B
Micrel, Inc.
MIC37501/37502
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ................................................. 6.5V
Enable Input Voltage (V
EN
) ....................................... 6.5V
Power Dissipation(P
D
) .......................... 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, 5 sec.) ....................260°C
ESD Rating
(3)
...............................................................2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) ......................................... 2.3V to 6.0V
Enable Input Voltage (V
EN
) .................................. 0V to 6.0V
Junction Temperature Range(T
J
) ....... –40°C
≤
T
J
≤
+125°C
Maximum Power Dissipation .....................................Note
4
Package Thermal Resistance
S-Pak(θ
JA
) ......................................................... 38°C/W
S-Pak(θ
JC
) ........................................................... 2°C/W
TO-263(θ
JA
).................................................... 26.2°C/W
TO-263(θ
JC
)......................................................... 2°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 otherwise noted.
Parameter
Condition
Min
Typ
Max
Units
Output Voltage Accuracy
Output Voltage Line Regulation
Output Voltage Load Regulation
V
IN
– V
OUT
, Dropout Voltage
(6)
Ground Pin Current
(7)
Ground Pin Current in Shutdown
Current Limit
Start-up Time
Enable Input
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 5A
I
L
= 2.5A
I
L
= 5A
I
L
= 5A
V
IL
< 0.5V, V
IN
= V
OUT
+ 1V
V
OUT
= 0
V
EN
= V
IN
, I
OUT
= 10mA, C
OUT
= 100µF
Regulator enable
Regulator shutdown
V
IL
< 0.8V (Regulator shutdown)
V
IH
> 2.25V (Regulator enabled)
–1
–2
+1
+2
%
%
%
%
mV
mV
mA
µA
A
µs
V
0.06
0.2
330
57
1.0
5
0.5
1
350
500
100
11
500
7.5
170
Enable Input Threshold
Enable Pin Input Current
2.25
0.8
V
µA
µA
µA
µA
µA
µA
mV
mV
%
%
2
4
1
15
30
75
1
2
210
93
2
99.2
1.228
1.215
1.240
40
1.252
1.265
80
120
400
500
Flag Output
I
FLG(LEAK)
V
FLG(LO)
V
FLG
V
OH
= 6V
V
IN
= 2.25V, I
OL
= 250µA
(8)
Low threshold, % of V
OUT
below nominal
Hysteresis
High threshold, % of V
OUT
below nominal
%
V
V
nA
nA
MIC37502 Only
Reference Voltage
Adjust Pin Bias Current
May 2011
3
M9999-050511-B
Micrel, Inc.
Notes:
1. Exceeding the ratings in the “Absolute Maximum Ratings” section may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
4. P
D(max)
= (T
J(max)
– T
A
) /
θ
JC
, where
θ
JC
depends upon the printed circuit layout. See “Applications Information” section.
5. Specification for packaged product only
MIC37501/37502
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 dut to a minimum input operating voltage of 2.3V.
7. I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
8. For a 2.5V device, V
IN
= 2.3V (device is in dropout).
May 2011
4
M9999-050511-B
Micrel, Inc.
MIC37501/37502
Typical Characteristics
450
400
DROPOUT (mV)
300
250
200
150
100
50
0
012345
OUTPUT CURRENT (A)
250
-40 -20 02 04 06 08 0 100 120
TEMPERATURE (°C)
DROPOUT (mV)
350
2.5V
OUT
450
400
350
300
Dropout
vs. Output Current
500
Dropout
vs. Temperature
OUTPUT VOLTAGE (V)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
Dropout Characteristics
(1.5V)
10mA load
2.5V
OUT
5A load
0
1.5
1.7
1.9
2.1
2.3
INPUT VOLTAGE (V)
2.5
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
10mA load
OUTPUT VOLTAGE (V)
2
10mA load
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
1.5
Dropout Characteristics
(1.8V)
3.0
2.5
2.0
1.5
1.0
0.5
0
1.5
Dropout Characteristics
(2.5V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Dropout Characteristics
(3.3V)
10mA load
5A load
5A load
5A load
1.7 1.9 2.1 2.3 2.5 2.7
INPUT VOLTAGE (V)
2.0
2.5
3.0
INPUT VOLTAGE (V)
50
GROUND CURRENT (mA)
45
40
35
30
25
20
15
10
5
0
Ground Current
vs. Output Current
GROUND CURRENT (mA)
2.5V
OUT
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Ground Current
vs. Suppl (1.5V)
GROUND CURRENT (mA)
80
70
60
50
40
30
20
10
0
10mA
100mA
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT CURRENT (A)
012345
INPUT VOLTAGE (V)
0.7
GROUND CURRENT (mA)
0.6
0.5
0.4
0.3
0.2
0.1
0
Ground Current
vs. Suppl (1.8V)
GROUND CURRENT (mA)
90
80
70
60
50
40
30
20
10
0
Ground Current
vs. Suppl (1.8V)
GROUND CURRENT (mA)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10mA
2.5A
100mA
5A
012345
INPUT VOLTAGE (V)
012345
INPUT VOLTAGE (V)
May 2011
5
1.5
1.8
2.0
2.3
2.5
2.8
3.0
3.3
3.5
3.8
4.0
4.3
INPUT VOLTAGE (V)
3.5
0
Ground Current
vs. Suppl (1.5V)
2.5A
5A
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
Ground Current
vs. Suppl (2.5V)
100mA
10mA
012345
INPUT VOLTAGE (V)
M9999-050511-B
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