MIC5239
Low Quiescent Current 500mA µCap
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
___________________________________________________________________________________________________________
40
35
I
OUT
= 1mA
I
OUT
= 100µA
Typical Application
V
IN
30V
MIC5239
IN
OUT
EN
FLG
GND
V
OUT
3.0V/100µA
I
GND
= 23µA
30
25
20
15
I
OUT
= 10µA
9
14
Regulator with Low I
O
and Low I
Q
10
4
19
24
29
Ground Current vs. Input Voltage
MLF and
MicroLeadFrame
is a registered trademark of Amkor Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2007
M9999-121007
Micrel
MIC5239
Pin Configuration
SOIC-8 (M)
MSOP-8(MM)
(Fixed)
SOT-223 (S)
SOIC-8 (M)
MSOP-8(MM)
(Adj)
Pin Description
Pin Number
MSOP/SOIC
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
December 2007
3
M9999-121007
Micrel
MIC5239
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)
SOT-23-3L ............................................................... 2kV
MSOP-8L .............................................................. 1.5kV
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
Parameter
Condition
Min
Typ
Max
Units
V
OUT
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
∆V
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
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
–1
–2
0.06
15
50
260
350
23
1.3
8.5
0.1
850
160
94
95
150
0.1
1
2
0.5
30
350
400
40
45
5
15
1
1200
%
%
%
mV
mV
mV
mV
mV
µA
µA
mA
mA
µA
mA
µVrms
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
Ground Pin Shutdown
Short Circuit Current
Output Noise
Low Threshold
High Threshold
FLAG Output Low Voltage
FLAG Output Leakage
Input Low Voltage
Input High Voltage
Enable Input Current
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
V
EN
= 0.6V, regulator off
V
EN
= 2.0V, regulator on
V
EN
= 30V, regulator on
2.0
–1.0
–2.0
%
%
mV
µA
0.6
1.0
2.0
1.0
2.0
2.5
5.0
V
V
µA
µA
µA
µA
µA
µA
0.01
0.15
0.5
December 2007
4
M9999-121007
Micrel
Notes:
1.
2.
3.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
MIC5239
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.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
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.
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.
4.
5.
6.
7.
December 2007
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M9999-121007
51单片机
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