MIC5239
Micrel, Inc.
MIC5239
Low Quiescent Current 500mA
µ
Cap LDO Regulator
General Description
The MIC5239 is a low quiescent current,
µCap
low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 23µA, 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
µCap
LDO, the MIC5239 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 3.3µF 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, reverse-leakage protection, and reverse-
battery protection.
Available in the thermally enhanced SOIC-8, MSOP-8 and
SOT-223, the MIC5239 comes in fixed 1.5V, 1.8V, 2.5V,
3.0V, 3.3V and 5.0V, and adjustable voltages. For other
output voltages, contact Micrel.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Ultra-low quiescent current (I
Q
= 23µA @I
O
= 100µA)
Continuous 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
Typical Application
40
V
IN
30V
MIC5239
IN
OUT
EN
FLG
GND
GROUND CURRENT (µA)
35
30
25
20
15
10
4
V
OUT
3.0V/100µA
I
GND
= 23µA
I
OUT
= 1mA
I
OUT
= 100µA
I
OUT
= 10µA
9
14
19
24
INPUT VOLTAGE (V)
29
Regulator with Low I
O
and Low I
Q
Ground Current vs. Input Voltage
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2005
1
M9999-060305
MIC5239
Micrel, Inc.
Ordering Information
Standard
Part Number*
Pb-Free
MIC5239-1.5YM
MIC5239-1.5YMM
MIC5239-1.5YS
MIC5239-1.8YM
MIC5239-1.8YMM
MIC5239-1.8YS
MIC5239-2.5YM
MIC5239-2.5YMM
MIC5239-2.5YS
MIC5239-3.0YM
MIC5239-3.0YMM
MIC5239-3.0YS
MIC5239-3.3YM
MIC5239-3.3YMM
MIC5239-3.3YS
MIC5239-5.0YM
MIC5239-5.0YMM
MIC5239-5.0YS
MIC5239YM
MIC5239YMM
Voltage
1.5V
1.5V
1.5V
1.8V
1.8V
1.8V
2.5V
2.5V
2.5V
3.0V
3.0V
3.0V
3.3V
3.3V
3.3V
5.0V
5.0V
5.0V
ADJ
ADJ
Junction
Temperature
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
Package
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
SOT-23
8-lead SOIC
8-lead MSOP
MIC5239-1.5BM
MIC5239-1.5BMM
MIC5239-1.5BS
MIC5239-1.8BM
MIC5239-1.8BMM
MIC5239-1.8BS
MIC5239-2.5BM
MIC5239-2.5BMM
MIC5239-2.5BS
MIC5239-3.0BM
MIC5239-3.0BMM
MIC5239-3.0BS
MIC5239-3.3BM
MIC5239-3.3BMM
MIC5239-3.3BS
MIC5239-5.0BM
MIC5239-5.0BMM
MIC5239-5.0BS
MIC5239BM
MIC5239BMM
* Other voltage options available. Contact Micrel Marketing for information.
Pin Configuration
EN 1
FLG 2
IN
3
OUT 4
8 GND
GND
EN 1
TAB
8 GND
7 GND
6 GND
5 GND
7 GND
6 GND
5 GND
ADJ 2
IN
3
OUT 4
SOIC-8 (M)
MSOP-8 (MM)
(Fixed)
1
2
3
IN
GND OUT
SOIC-8 (M)
MSOP-8 (MM)
(Adj.)
SOT-223 (S)
Pin Description
Pin Number
MSOP-8/SOIC-8
2 (Fixed)
Pin Number
SOT-223
—
Pin Name
FLG
Pin Function
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.
Adjustable Feedback Input: Connect to voltage divider network.
Power Supply Input.
Regulated Output.
Enable (Input): Logic low = shutdown; logic high = enabled.
Ground: Pins 5, 6, 7, and 8 are internally connected in common via the
leadframe.
2 (Adj.)
3
4
1
5–8
—
1
3
—
2
ADJ
IN
OUT
EN
GND
M9999-060305
2
June 2005
MIC5239
Micrel, Inc.
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ..................................... –20V to +32V
Enable Input Voltage (V
EN
) .......................... –0.3V to +32V
Power Dissipation (P
D
)
(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
(4)
Operating Ratings
(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
(θ
JA
) ......................................................... 80°C/W
SOT-223
(θ
JA
) ..................................................... 50°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V; V
EN
≥
2.0V; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
OUT
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
∆V
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
Conditions
variation from nominal V
OUT
V
IN
= V
OUT
+ 1V to 30V
I
OUT
= 100µA to 500mA
(6)
I
OUT
= 100µA
I
OUT
= 150mA
I
OUT
= 500mA
I
GND
Ground Pin Current
V
EN
≥
2.0V, I
OUT
= 100µA
V
EN
≥
2.0V, I
OUT
= 150mA
V
EN
≥
2.0V, I
OUT
= 500mA
I
GND(SHDN)
I
SC
e
n
FLAG Output
V
FLG
V
OL
I
LEAK
Enable Input
V
IL
V
IH
I
IN
Input Low Voltage
Input High Voltage
V
Enable Input Current
V
EN
= 0.6V, regulator off
V
EN
= 2.0V, regulator on
V
EN
= 30V, regulator on
Notes
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D
(max) = (T
J
(max) – T
A
)
÷
θ
JA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
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.
Min
–1
–2
Typ
Max
1
+2
Units
%
%
%
mV
mV
0.06
15
50
260
350
23
1.3
8.5
0.1
850
160
0.5
30
350
400
mV
mV
mV
40
45
5
15
1
1200
µA
µA
mA
mA
µA
mA
µVrms
Ground Pin in Shutdown
Short Circuit Current
Output Noise
V
EN
≤
0.6V, V
IN
= 30V
V
OUT
= 0V
10Hz to 100kHz, V
OUT
= 3.0V, C
L
= 3.3µF
% of V
OUT
% of V
OUT
V
IN
= V
OUT(nom)
– 0.12V
OUT
, I
OL
= 200µA
V
OH
= 30V
regulator off
regulator on
2.0
Low Threshold
High Threshold
FLAG Output Low Voltage
FLAG Output Leakage
94
95
150
0.1
%
%
mV
µA
0.6
AARTO
V
–1.0
–2.0
0.01
0.15
0.5
1.0
2.0
1.0
2.0
2.5
5.0
µA
µA
µA
µA
µA
µA
June 2005
3
M9999-060305
MIC5239
Notes:
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
Micrel, Inc.
6. 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.
7. 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.
M9999-060305
4
June 2005
MIC5239
Micrel, Inc.
Typical Characteristics
V
OUT
= 3V
Power Supply
Rejection Ratio
60
50
PSRR (dB)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
I
LOAD
= 500mA
450
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
vs. Output Current
600
500
400
300
200
100
Dropout Voltage
vs. Temperature
I
OUT
= 500mA
40
30
20
10
0
0.01
0.1
1
10
100
FREQUENCY (kHz)
1000
100 200 300 400 500
OUTPUT CURRENT (mA)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Dropout
Characteristics
3.5
OUTPUT VOLTAGE (V)
Ground Pin Current
vs. Output Current
9000
GROUND CURRENT (µA)
Ground Pin Current
vs. Output Current
GROUND CURRENT (µA)
30
28
26
24
22
20
18
16
14
12
10
0
V
IN
= 30V
V
IN
= 24V
3
I
LOAD
= 100µA
8000
7000
6000
5000
4000
3000
2000
1000
0
0
V
IN
= 4V
2.5 I
LOAD
= 250mA
2
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5 4
INPUT VOLTAGE (V)
I
LOAD
= 500mA
V
IN
= 4V
V
IN
= 12V
100 200 300 400 500
OUTPUT CURRENT (mA)
100 200 300 400 500
OUTPUT CURRENT (µA)
80
GROUND CURRENT (µA)
Ground Pin Current
vs. Temperature
GROUND CURRENT (mA)
75
70
65
60
55
I
LOAD
= 10mA
50
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2
Ground Pin Current
vs. Temperature
I
LOAD
= 250mA
10.5
10
9.5
9
8.5
8
Ground Pin Current
vs. Temperature
I
LOAD
= 500mA
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
7.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Pin Current
vs. Input Voltage
100
GROUND CURRENT (mA)
Ground Pin Current
vs. Input Voltage
14.4
12.4
10.4
8.4
6.4
4.4
2.4
0.4
1.5
2
2.5
3
3.5
INPUT VOLTAGE (V)
4
I
OUT
= 250mA
I
OUT
=500mA
GROUND CURRENT (µA)
40
35
30
25
20
15
10
4
Ground Pin Current
vs. Input Voltage
GROUND CURRENT (µA)
90
80
70
60
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 100µA
50 I
OUT
= 1mA
40
30
20
10
0
1.5
I
OUT
= 100µA
I
OUT
= 10µA
9
14
19
24
INPUT VOLTAGE (V)
29
I
OUT
= 10µA
2
2.5
3
3.5
INPUT VOLTAGE (V)
4
June 2005
5
M9999-060305
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