January 2002
1
MIC5239
MIC5239
Micrel
MIC5239
Low Quiescent Current 500mA
Cap LDO Regulator
Advance Information
General Description
The MIC5239 is a low quiescent current,
Cap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 23
A, it is ideal for supplying keep-
alive power in systems with high-voltage batteries.
Capable of 500mA output, the MIC5239 has a dropout
voltage of only 350mV. It can provide high output current for
applications such as USB.
As a
Cap LDO, the MIC5239 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 3.3
F output
capacitor for stability.
The MIC5239 includes a logic compatible enable input and an
undervoltage error flag indicator. Other features of the
MIC5239 include thermal shutdown, current-limit, overvolt-
age shutdown, load-dump protection, reverse leakage pro-
tections, and reverse battery protection.
Available in the thermally enhanced SOIC-8, MSOP-8 and
SOT-223, the MIC5239 comes in fixed 3.0V and adjustable
voltages. For other output voltages, contact Micrel.
Typical Application
I
GND
= 23
A
V
OUT
3.0V/100
A
V
IN
30V
IN
MIC5239
EN
OUT
GND
FLG
Regulator with Low I
O
and Low I
Q
Features
Ultra-low quiescent current (I
Q
= 23
A @I
O
= 100
A)
Continuious 500mA output current
Wide input range: 2.3V to 30V
Low dropout voltage:
350mV @500mA;
1.0% initial output accuracy
Stable with ceramic or tantalum output capacitor
Logic compatible enable input
Low output voltage error flag indicator
Overcurrent protection
Thermal shutdown
Reverse-leakage protection
Reverse-battery protection
High-power SOIC-8, MSOP-8 and SOT-223 packages
Applications
USB power supply
Keep-alive supply in notebook and portable personal
computers
Logic supply from high-voltage batteries
Automotive electronics
Battery-powered systems
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
Ground Current vs. Input Voltage
10
15
20
25
30
35
40
4
9
14
19
24
29
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
I
OUT
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
MIC5239
Micrel
MIC5239
2
January 2002
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
MSOP-8/SOIC-8
SOT-223
2 (Fixed)
-
FLG
Error FLAG (Output): Open-collector output is active low when the output is
out of regulation due to insufficient input voltage or excessive load. An
external pull-up resistor is required.
2 (Adj)
-
ADJ
Adjustable Feedback Input. Connect to voltage divider network.
3
1
IN
Power supply input.
4
3
OUT
Regulated Output
1
-
EN
Enable (Input): Logic low = shutdown; logic high = enabled.
58
2
GND
Ground: Pins 5, 6, 7, and 8 are internally connected in common via the
leadframe.
Pin Configuration
EN
FLG
IN
OUT
GND
GND
GND
GND
1
2
3
4
8
7
6
5
SOIC-8 (M)
MSOP-8 (MM)
(Fixed)
Ordering Information
Part Number *
Voltage
Junction Temp. Range
Package
MIC5239-3.0BMM
3.0V
40
C to +125
C
8-lead MSOP
MIC5239-3.0BS
3.0V
40
C to +125
C
SOT-223
MIC5239-3.0BM
3.0V
40
C to +125
C
8-lead SOIC
MIC5239BMM
ADJ
40
C to +125
C
8-lead MSOP
MIC5239BM
ADJ
40
C to +125
C
8-lead SOIC
EN
ADJ
IN
OUT
GND
GND
GND
GND
1
2
3
4
8
7
6
5
SOIC-8 (M)
MSOP-8 (MM)
(Adj.)
IN
OUT
GND
1
3
2
TAB
GND
SOT-223 (S)
January 2002
3
MIC5239
MIC5239
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) ..................................... 20V to +32V
Enable Input Voltage (V
EN
) .......................... 0.3V to +32V
Power Dissipation (P
D
), Note 3 ............... Internally Limited
Junction Temperature (T
J
) ....................... 40
C to +125
C
Storage Temperature (T
S
) ....................... 65
C to +150
C
Lead Temperature (soldering, 5 sec.) ....................... 260
C
ESD Rating, Note 4
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ........................................ 2.3V to 30V
Enable Input Voltage (V
EN
) ................................. 0V to 30V
Junction Temperature (T
J
) ....................... 40
C to +125
C
Package Thermal Resistance
MSOP
(
JA
) ......................................................... 80
C/W
SOT-223
(
JA
) ..................................................... 50
C/W
Electrical Characteristics
V
IN
= V
OUT
+ 1V; V
EN
2.0V; I
OUT
= 100
A; T
J
= 25
C, bold values indicate 40
C
T
J
+125
C; unless noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OUT
Output Voltage Accuracy
variation from nominal V
OUT
1
1
%
2
+2
%
V
OUT
/V
OUT
Line Regulation
V
IN
= V
OUT
+ 1V to 30V
0.06
0.5
%
V
OUT
/V
OUT
Load Regulation
I
OUT
= 100
A to 500mA, Note 5
0.5
1
%
V
Dropout Voltage, Note 6
I
OUT
= 100
A
50
mV
I
OUT
= 150mA
260
350
mV
400
mV
I
OUT
= 500mA
350
mV
I
GND
Ground Pin Current
V
EN
2.0V, I
OUT
= 100
A
23
40
A
45
A
V
EN
2.0V, I
OUT
= 150mA
1.3
5
mA
V
EN
2.0V, I
OUT
= 500mA
8.5
15
mA
I
GND(SHDN)
Ground Pin in Shutdown
V
EN
0.6V, V
IN
= 30V
0.1
1
A
I
SC
Short Circuit Current
V
OUT
= 0V
850
1200
mA
e
n
Output Noise
10Hz to 100kHz, V
OUT
= 3.0V, C
L
= 3.3
F
160
Vrms
FLAG Output
V
FLG
Low Threshold
% of V
OUT
94
%
High Threshold
% of V
OUT
95
%
V
OL
FLAG Output Low Voltage
V
IN
= V
OUT(nom)
0.12V
OUT
, I
OL
= 200
A
150
mV
I
LEAK
FLAG Output Leakage
V
OH
= 30V
0.1
A
Enable Input
V
IL
Input Low Voltage
regulator off
0.6
V
V
IH
Input High Voltage
regulator on
2.0
V
I
IN
Enable Input Current
V
EN
= 0.6V, regulator off
1.0
0.01
1.0
A
2.0
2.0
A
V
EN
= 2.0V, regulator on
0.15
1.0
A
2.0
A
V
EN
= 30V, regulator on
0.5
2.5
A
5.0
A
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3:
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
T
A
)
JA
. Exceeding the maximum
allowable power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The
JA
of the MIC5239-
x.xBMM (all versions) is 80
C/W, the MIC5239-x.xBM (all versions) is 63
C/W, and the MIC5239-x.xBS (all versions) is 50
C/W mounted on a
PC board (see "Thermal Characteristics" for further details).
MIC5239
Micrel
MIC5239
4
January 2002
Note 4.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 5:
Regulation is measured at constant junction temperature using pulse testing with a low duty-cycle. Changes in output voltage due to heating
effects are covered by the specification for thermal regulation.
Note 6:
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0V
differential.
January 2002
5
MIC5239
MIC5239
Micrel
Typical Characteristics (V
O
= 3V)
0
10
20
30
40
50
60
0.01
0.1
1
10
100
1000
PSRR (dB)
FREQUENCY (Hz)
Power Supply
Rejection Ratio
I
LOAD
= 500mA
0
50
100
150
200
250
300
350
400
450
0
100
200
300
400
500
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
0
100
200
300
400
500
600
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (
C)
Dropout Voltage
vs. Temperature
I
OUT
= 500mA
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3 3.5 4
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout
Characteristics
I
LOAD
= 100
A
I
LOAD
= 250mA
I
LOAD
= 500mA
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
0
100
200
300
400
500
GROUND CURRENT (
A)
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Output Current
V
IN
= 4V
10
12
14
16
18
20
22
24
26
28
30
0
100
200
300
400
500
GROUND CURRENT (
A)
OUTPUT CURRENT (
A)
Ground Pin Current
vs. Output Current
V
IN
= 24V
V
IN
= 12V
V
IN
= 4V
V
IN
= 30V
50
55
60
65
70
75
80
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 10mA
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 250mA
7.5
8
8.5
9
9.5
10
10.5
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 500mA
0
10
20
30
40
50
60
70
80
90
100
1.5
2
2.5
3
3.5
4
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 100
A
I
OUT
= 10
A
0.4
2.4
4.4
6.4
8.4
10.4
12.4
14.4
1.5
2
2.5
3
3.5
4
GROUND CURRENT (mA)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
=500mA
I
OUT
= 250mA
10
15
20
25
30
35
40
4
9
14
19
24
29
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
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