MIC39500/39501
5A µCap Low-Voltage Low-Dropout Regulator
General Description
The MIC39500 and MIC39501 are 5A 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
MIC39500/1 offers extremely low dropout (typically 400mV
at 5A) and low ground current (typically 70mA at 5A).
The MIC39500/1 is ideal for PC Add-In cards that need to
convert from standard 2.5V or 3.3V, down to new, lower
core voltages. A guaranteed maximum dropout voltage of
500mV over all operating conditions allows the MIC39500/1
to provide 2.5V from a supply as low as 3V or 1.8V from
2.5V. The MIC39500/1 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 MIC39500/1 is fully protected with overcurrent limiting,
thermal shutdown, reversed-battery protection, reversed-
lead insertion protection, and reversed-leakage protection.
The MIC39501 offers a TTL-logic-compatible enable pin and
an error flag that indicates undervoltage and overcurrent
conditions. Offered in a fixed voltages, 1.8V and 2.5V, the
MIC39500/1 comes in the TO-220 and TO-263 packages
and an ideal upgrade to older, NPN-based linear voltage
regulators.
For applications requiring input voltage
greater than 16V, see the
MIC29500/1/2/3 family. For applications
with input voltage 6V or below, see
MIC3750x LDOs.
Features
• 5A minimum guaranteed output current
• 400mV dropout voltage
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 and reversed-lead insertion protection
• Reversed-leakage protection
• Fast transient response
• TO-263 and TO-220 packages
• TTL/CMOS compatible enable pin (MIC39501 only)
• Error flag output (MIC39501 only)
• Ceramic capacitor stable (See Application Information)
Applications
•
•
•
•
•
•
•
Low Voltage Digital ICs
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
MIC39500-2.5
IN
OUT
GND
47µF
Enable
Shutdown
100KΩ
MIC39501-2.5
V
IN
3.3V
1.0µF
V
OUT
2.5V
EN
IN
FLG
OUT
GND
ERROR
FLAG OUTPUT
V
IN
3.3V
1.0µF
V
OUT
2.5V
47µF
MIC39500
MIC39501
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
August 2005
1
M9999-082605-B
MIC39500/39501
Micrel
Absolute Maximum Ratings
(Note 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,
Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ................................... +2.25V 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
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
ppm/°C
V
DO
Output Voltage Temp. Coefficient,
Note 5
Dropout Voltage,
Note 6
I
OUT
= 250mA, ∆V
OUT
= –2%
I
OUT
= 2.5A, ∆V
OUT
= –2%
I
OUT
= 5A, ∆V
OUT
= –2%
I
GND
I
GND(do)
I
OUT(lim)
e
n
µV(rms)
V
EN
I
IN
Ground Current,
Note 7
Dropout Ground Pin Current
Current Limit
Output Noise Voltage
I
OUT
= 2.5A, V
IN
= V
OUT
+ 1V
I
OUT
= 5A, V
IN
= V
OUT
+ 1V
V
IN
≤ V
OUT(nominal)
– 0.5V, I
OUT
= 10mA
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
C
OUT
= 47µF, I
OUT
= 100mA, 10Hz to 100kHz
125
320
400
15
70
2.1
7.5
260
575
50
250
mV
mV
mV
mA
mA
mA
A
Condition
10mA
10mA ≤ I
OUT
≤ 5A, V
OUT
+ 1V ≤ V
IN
≤ 16V
I
OUT
= 10mA, V
OUT
+ 1V ≤ V
IN
≤ 16V
V
IN
= V
OUT
+ 1V, 10mA ≤ I
OUT
≤ 5A
Min
–1
1
–2
0.06
0.2
20
Typ
Max
1
2
0.5
1
100
Units
%
%
%
%
Enable Input (MIC39501)
Enable Input Voltage
Enable Input Current
logic low (off)
logic high (on)
V
EN
= V
IN
V
EN
= 0.8V
I
OUT(shdn)
I
FLG(leak)
V
FLG(do)
Shutdown Output Current
Output Leakage Current
Output Low Voltage
Low Threshold
V
FLG
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
0.8
2.25
30
35
75
2
4
10
0.01
180
93
99.2
1
20
1
2
300
400
V
V
µA
µA
µA
µA
µA
µA
µA
mV
mV
%
%
%
Note 8
V
OH
= 16V
V
IN
= 2.250V, I
OL
, = 250µA,
Note 9
1% of V
OUT
1% of V
OUT
Flag Output (MIC39501)
High Threshold
Hysteresis
Exceeding the absolute maximum ratings may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
P
D(max)
= (T
J(max)
– T
A
)
÷ θ
JA
, where
θ
JA
depends upon the printed circuit layout. See “Applications Information.”
Output voltage temperature coefficient is ∆V
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 98% of its nominal output voltage with V
IN
= V
OUT
+ 1V. For voltages below 2.25V, Dropout volt-
age is the input-to-output voltage differential with the minimum input voltage being 2.25V. Minimum input operating voltage is 2.25V.
I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
V
EN
≤ 0.8V, V
IN
≤ 8V, and V
OUT
= 0V
For a 2.5V device, V
IN
= 2.250V (device is in dropout).
August 2005
3
M9999-082605-B
MIC39500/39501
Micrel
Typical Characteristics
P ower S upply
R ejection R atio
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 5A
PSRR (dB)
35
30
25
PSRR (dB)
35
30
P ower S upply
R ejection R atio
450
400
DROPOUT VOLTAGE (mV)
Dropout V oltage vs .
Output C urrent
V
OUT
= 1.8V
20
15
10
5 C
IN
= 0
C
OUT
= 47µF T ant
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
IN
= 3.3V
V
OUT
= 2.5V
20 I
LOAD
= 5A
25
15
10
5 C
IN
= 0
C
OUT
= 100µF C eramic
0
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
350
300
250
200
150
100
50
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
V
OUT
= 2.5V
0
OUTPUT CURRENT (mA)
600
500
DROPOUT VOLTAGE (mV)
Dropout V oltage
vs . T emperature
2.8
V
OUT
= 1.8V
OUTPUT VOLTAGE (V)
Dropout C harac teris tic s
80
G round C urrent vs .
Output C urrent
V
IN
= V
OUT
+1V
2.6
2.4
2.2
2
1.8
1.6
I
LOAD
= 2.5A
I
LOAD
= 100mA
GROUND CURRENT (mA)
70
60
50
40
30
20
10
400
300
200
100
0
20
40
60
-40
-20
80
100
120
140
V
OUT
= 2.5V
I
LOAD
= 5A
V
OUT
= 2.5V
V
OUT
= 1.8V
0
500
1000
1500
2000
2500
TEMPERATURE (°C)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
12.0
10.0
GROUND CURRENT (mA)
G round C urrent vs .
S upply V oltage
180
160
GROUND CURRENT (mA)
G round C urrent vs .
S upply V oltage
10
9
8
7
6
5
4
3
G round C urrent
vs . Temperature
GROUND CURRENT (mA)
140
120
100
80
60
40
20
0
0
I
LOAD
= 5.0A
I
LOAD
= 2.5A
I
LOAD
= 2.0A
2
4
6
8
SUPPLY VOLTAGE (V)
10
8.0
6.0
4.0
2.0
0.0
I
LOAD
= 10mA
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
= 1.8V
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (V)
2 I
LOAD
= 10mA
1 V =V
+ 1V
IN
OUT
0
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
30
25
GROUND CURRENT (mA)
G round C urrent
vs . T emperature
V
OUT
= 2.5V
80.0
70.0
G round C urrent
vs . T emperature
V
OUT
= 2.5V
10.0
9.0
S hort C irc uit C urrent
vs . T emperature
T ypical 2.5V Device
GROUND CURRENT (mA)
60.0
50.0 V
OUT
= 1.8V
40.0
30.0
20.0
10.0
I
LOAD
= 5A
V
IN
= V
OUT
= 1V
SHORT CIRCUIT CURRENT (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
V
IN
= V
OUT
+ 1V
0
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
T ypical 1.8V Device
20
15
10
V
OUT
= 1.8V
5 I
LOAD
= 2.5A
V
IN
= V
OUT
+ 1V
0
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
M9999-082605-B
4
3000
3500
4000
4500
5000
0
I
LOAD
= 5A
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
1.4
0
August 2005
单片机
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