MIC39300/39301/39302
3A, Low-Voltage Low-Dropout Regulator
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 Micrel’s proprietary Super
βeta
®
PNP pass element, the MIC39300/1/2 offers extremely
low dropout (typically 385mV at 3.0A) and low ground
current (typically 36mA at 3.0A).
The MIC39300/1/2 is 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 500mV 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 has fast transient
response for heavy switching applications. The device
requires only 47µF of output capacitance to maintain
stability and achieve fast transient response.
The MIC39300/1/2 is fully protected with overcurrent
limiting, thermal shutdown, reversed-battery protection,
reversed-leakage protection, and reversed-lead insertion.
The MIC39301 offers a TTL-logic compatible enable pin
and an error flag that indicates under voltage and over
current conditions. Offered in fixed voltages, the
MIC39300/1 comes in the TO-220 and TO-263 (D
2
Pak)
packages and is 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.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
3.0A minimum guaranteed output current
550mV 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)
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
MIC39300
MIC39301
MIC39302 Adjustable Output Application
(*See Minimum Load Current Section)
**See Thermal Load Current Section
Super
βeta
PNP is a registered trademark of Micrel, Inc.
StrongARM is a trademark of Advanced RISC Machines, Ltd
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
M9999-102309-A
Micrel, Inc.
MIC39300/39301/39302
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ....................................... –20V to +20V
Enable Voltage (V
EN
)....................................................+20V
Storage Temperature (T
S
)................–65°C to +150°C Lead
Temperature (soldering, 5 sec.) ................................. 260°C
ESD Rating................................................................
Note 3
Operating Ratings
(2)
Supply Voltage (V
IN
)...................................... +2.5V to +16V
Enable Voltage (V
EN
)....................................................+16V
Maximum Power Dissipation (P
D(max)
) .......................
Note 4
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
TO-263 (θ
JC
) ........................................................2°C/W
TO-220 (θ
JC
) ........................................................2°C/W
Electrical Characteristics
(5)
T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Symbol
V
OUT
Parameter
Output Voltage
Line Regulation
Load Regulation
∆V
OUT
/∆T
V
DO
Output Voltage Temp.
Coefficient
Note 6
Dropout Voltage
Note 7, Note 10
I
OUT
= 100mA,
∆V
OUT
= –1%
I
OUT
= 750mA,
∆V
OUT
= –1%
I
OUT
= 1.5A,
∆V
OUT
= –1%
I
OUT
= 3A,
∆V
OUT
= –1%
I
GND
Ground Current
Note 8
I
GND(do)
I
OUT(lim)
V
EN
I
IN
Dropout Ground Pin Current
Current Limit
Enable Input Voltage
Enable Input Current
I
OUT
= 750mA, 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
= 10mA
V
OUT
= 0V, VIN = VOUT + 1V
logic low (off)
logic high (on)
V
EN
= 2.5V
V
EN
= 0.8V
I
OUT(shdn)
Shutdown Output Current
10
2.5
15
30
75
2
4
Note 9
20
1
2
300
400
99.2
1
65
185
250
385
10
17
45
6
4.5
550
20
200
mV
mV
mV
mV
mA
mA
mA
mA
A
V
V
µA
µA
µA
µA
µA
µA
µA
mV
mV
%
%
%
Condition
10mA
10mA
≤
I
OUT
≤
3A, V
OUT
+ 1V
≤
V
IN
≤
8V
I
OUT
= 10mA, V
OUT
+ 1V
≤
V
IN
≤
8V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
3A
Min
–1
–2
0.06
0.2
20
Typ
Max
1
2
0.5
1
100
Units
%
%
%
%
ppm/°C
Enable Input (MIC39301)
0.8
Flag Output (MIC39301)
I
FLG(leak)
V
FLG(do)
V
FLG
Output Leakage Current
Output Low Voltage
Low Threshold
High Threshold
Hysteresis
V
OH
= 16V
V
IN
= 2.50V, I
OL
, = 250µA,
Note 10
% of V
OUT
% of V
OUT
93
0.01
220
October 2009
4
M9999-102309-A
Micrel, Inc.
Symbol
V
ADJ
V
TC
I
ADJ
I
TC
Notes:
1. Exceeding the absolute maximum ratings 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.
MIC39300/39301/39302
Parameter
Condition
Min
1.228
1.215
Note 11
20
40
80
120
0.1
Typ
1.240
Max
1.252
1.265
Units
V
V
ppm/°C
nA
nA
nA/°C
Reference (Adjust Pin) – MIC39302 only
Reference Voltage
Reference Voltage Temp.
Coefficient
Adjust Pin Bias Current
Adjust Pin Bias Current Temp.
Coefficient
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.
7. 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.
8. I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
9. V
EN
≤
0.8V, V
IN
≤
8V, and V
OUT
= 0V
10. For a 1.8V device, V
IN
= 2.5V.
11. Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 200mA load pulse at V
IN
= 8V for t = 10ms.
October 2009
5
M9999-102309-A
嵌入式系统
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