MIC39300/01/02
3A, Low Voltage Low Dropout Regulator
Features
• 3.0A Minimum Guaranteed Output Current
• 550 mV Maximum Dropout Voltage over
Temperature
• Ideal for 3.0V to 2.5V Conversion
• Ideal for 2.5V to 1.8V Conversion
• 1% Initial Accuracy
• Low Ground Current
• Current Limiting and Thermal Shutdown
• Reversed-Battery Protection
• Reversed-Leakage Protection
• Fast Transient Response
• TO-263 (D
2
Pak) and TO-220 Packaging
• TTL/CMOS Compatible Enable Pin (MIC39301/2
Only)
• Error Flag Output (MIC39301 Only)
• Adjustable Output (MIC39302 Only)
General Description
The MIC39300, MIC39301, and MIC39302 are 3.0A
low-dropout linear voltage regulators that provide a low
voltage, high-current output with a minimum of external
components. Utilizing Microchip’s proprietary Super
βeta PNP pass element, the MIC39300/1/2 offers
extremely low dropout (typically 385 mV at 3.0A) and
low ground current (typically 36 mA at 3.0A).
The MIC39300/1/2 are ideal for PC add-in cards that
need to convert from standard 3.3V to 2.5V or 2.5V to
1.8V. A guaranteed maximum dropout voltage of
500 mV over all operating conditions allows the
MIC39300/1/2 to provide 2.5V from a supply as low as
3V, and 1.8V from a supply as low as 2.5V. The
MIC39300/1/2 also have fast transient response for
heavy switching applications. The device requires only
47 µF of output capacitance to maintain stability and
achieve fast transient response.
The MIC39300/1/2 are fully protected with overcurrent
reversed-battery
limiting,
thermal
shutdown,
protection,
reversed-leakage
protection,
and
reversed-lead insertion. The MIC39301 offers a
TTL-logic compatible enable pin and an error flag that
indicates undervoltage and overcurrent conditions.
Offered in fixed voltages, the MIC39300/1 come in the
TO-220 and TO-263 (D
2
Pak) packages and are an
ideal upgrade to older, NPN-based linear voltage
regulators. The MIC39302 adjustable option allows
programming the output voltage anywhere between
1.24V and 15.5V and is offered in a 5-Pin TO-263
(D
2
Pak) package.
Applications
•
•
•
•
•
•
LDO Linear Regulator for PC Add-In Cards
High-Efficiency Linear Power Supplies
SMPS Post Regulator
Multimedia and PC Processor Supplies
Low Voltage Microcontrollers
StrongARM Processor Supply
Typical Application Circuits
MIC39300
MIC39300-2.5
V
IN
3.3V
IN
OUT
GND
V
OUT
2.5V
47μF Tantalum
ENABLE
SHUTDOWN
MIC39301
MIC39302 Adjustable Output
Application
3.0V
IN
C
IN
EN
GND
ADJ
*R2
MIC39302U
IN
OUT
*R1
ERROR FLAG
OUTPUT
100k
MIC39301-2.5
EN
IN
FLG
OUT
GND
V
IN
3.3V
V
OUT
2.5V
47μF Tantalum
2.5V
OUT
@3A
C
OUT
47μF, Tantalum
See (Section
4.5
Current”)
“Minimum
Load
2018 Microchip Technology Inc.
DS20006017A-page 1
MIC39300/01/02
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
IN
).................................................................................................................................... –20V to +20V
Enable Voltage (V
EN
) ................................................................................................................................................+20V
ESD Rating (Note
1)...................................................................................................................................
ESD Sensitive
Operating Ratings ‡
Supply Voltage (V
IN
)................................................................................................................................... +2.5V to +16V
Enable Voltage (V
EN
) ................................................................................................................................................+16V
Maximum Power Dissipation (P
D(max)
)................................................................................................................. (Note
2)
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability. Specifications are for packaged product only.
‡ Notice:
The device is not guaranteed to function outside its operating ratings.
Note 1:
Devices are ESD sensitive. Handling precautions are recommended.
2:
P
D(max)
= (T
J(max)
– T
A
) ÷ θ
JA
, where θ
JA
depends upon the printed circuit layout. See
Section 4.0 “Application Information”
section.
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
T
J
= 25°C,
Bold
values indicate –40°C ≤ T
J
≤ +125°C; unless otherwise specified.
Parameter
Output Voltage
Line Regulation
Load Regulation
Output Voltage Temperature
Coefficient (Note
1)
Dropout Voltage (Note
2),
(Note
4)
Symbol
V
OUT
ΔV
OUT
/ΔV
IN
ΔV
OUT
/V
OUT
ΔV
OUT
/ΔT
Min.
–1
–2
—
—
—
—
V
DO
—
—
—
—
Ground Current (Note
3)
I
GND
I
GND(do)
I
OUT(lim)
—
—
Dropout Ground Pin Current
Current Limit
Enable Input (MIC39301)
Enable Input Voltage
V
EN
—
2.5
—
—
0.8
—
V
V
Logic low (OFF)
Logic high (ON)
—
—
—
0.06
0.2
20
65
185
250
385
10
17
45
6
4.5
Typ.
Max.
1
2
0.5
1
100
200
—
—
550
20
—
—
—
—
Units
%
%
%
%
Conditions
10 mA
10 mA ≤ I
OUT
≤ 3A,V
OUT
+ 1V ≤
V
IN
≤ 8V
I
OUT
= 10 mA,V
OUT
+ 1V ≤ V
IN
≤
8V
V
IN
= V
OUT
+ 1V,10 mA ≤ I
OUT
≤
3A
ppm/°C —
mV
mV
mV
mV
mA
mA
mA
mA
A
I
OUT
= 100 mA, ΔV
OUT
= –1%
I
OUT
= 750 mA, ΔV
OUT
= –1%
I
OUT
= 1.5A, ΔV
OUT
= –1%
I
OUT
= 3A, ΔV
OUT
= –1%
I
OUT
= 750 mA, V
IN
= V
OUT
+ 1V
I
OUT
= 1.5A, V
IN
= V
OUT
+ 1V
I
OUT
= 3A, V
IN
= V
OUT
+ 1V
V
IN
≤ V
OUT
(nominal) –0.5V,
I
OUT
= 10 mA
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
DS20006017A-page 4
2018 Microchip Technology Inc.
MIC39300/01/02
Electrical Characteristics:
T
J
= 25°C,
Bold
values indicate –40°C ≤ T
J
≤ +125°C; unless otherwise specified.
Parameter
Symbol
Min.
1
Enable Input Current
I
IN
—
—
—
Shutdown Output Current
(Note
5)
Flag Output (MIC39301)
Output Leakage Current
Output Low Voltage (Note
4)
Low Threshold
High Threshold
Hysteresis
Reference (Adjust Pin) - MIC39302 Only
Reference Voltage
Reference Voltage Temp.
Coefficient (Note
6)
Adjust Pin Bias Current
Adjust Pin Bias Current
Temp. Coefficient
1:
2:
V
ADJ
V
TC
I
ADJ
I
TC
1.228
1.215
—
—
—
—
1.240
—
20
40
—
0.1
1.252
1.265
—
80
120
—
V
—
V
FLG
I
FLG(leak)
V
FLG(do)
—
—
—
—
93
—
—
0.01
—
220
—
—
—
1
1
2
300
400
—
99.2
—
µA
mV
%
%
%
V
IN
= 16V
V
IN
= 2.50V, I
OL
= 250 µA
—
% of V
OUT
% of V
OUT
—
I
OUT(shdn)
—
Typ.
15
—
—
—
10
Max.
30
75
2
4
20
Units
µA
µA
µA
µA
µA
Conditions
V
EN
= 2.5V
V
EN
= 0.8V
—
ppm/°C —
nA
nA/°C
—
—
3:
4:
5:
6:
Output voltage temperature coefficient is ΔV
OUT
(worst case) ÷ (T
J(max)
– T
J(min)
) where T
J(max)
is +125°C
and T
J(min)
is –40°C.
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 2.5V, dropout voltage is the input-to-output voltage differential with the minimum
input voltage being 2.5V. Minimum input operating voltage is 2.5V.
I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
For a 1.8V device, V
IN
= 2.5V.
V
EN
≤ 0.8V, V
IN
≤ 8V, and V
OUT
= 0V.
Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipa-
tion is applied, excluding load or line regulation effects. Specifications are for a 200 mA load pulse at
V
IN
= 8V for t = 10 ms.
2018 Microchip Technology Inc.
DS20006017A-page 5
Embedded System
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