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PDF MIC5236-5.0BM Data sheet ( Hoja de datos )
| Número de pieza | MIC5236-5.0BM | |
| Descripción | Low Quiescent Current Cap LDO Regulator Preliminary Information | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC5236
Micrel
MIC5236
Low Quiescent Current µCap LDO Regulator
Preliminary Information
General Description
The MIC5236 is a low quiescent current, µCap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 20µA, it is ideal for supplying keep-
alive power in systems with high-voltage batteries.
Capable of 150mA output, the MIC5236 has a dropout
voltage of only 300mV. It can also survive an input transient
of –20V to +60V.
As a µCap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0µF output
capacitor for stability.
The MIC5236 includes a logic compatible enable input and an
undervoltage error flag indicator. Other features of the
MIC5236 include thermal shutdown, current-limit, overvolt-
age shutdown, load-dump protection, reverse leakage pro-
tections, and reverse battery protection.
Available in the thermally enhanced SOP-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjust-
able voltages. For other output voltages, contact Micrel.
Features
• Ultra-low quiescent current (IQ = 20µA @IO = 100µA)
• Wide input range: 2.3V to 30V
• Low dropout:
230mV @50mA;
300mV @150mA
• Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs
• ±1.0% initial output accuracy
• Stable with ceramic or tantalum output capacitor
• Load dump protection: –20V to +60V input transient
survivability
• Logic compatible enable input
• Low output flag indicator
• Overcurrent protection
• Thermal shutdown
• Reverse-leakage protection
• Reverse-battery protection
• High-power SOP-8 and MSOP-8
Applications
• Keep-alive supply in notebook and
portable personal computers
• Logic supply from high-voltage batteries
• Automotive electronics
• Battery-powered systems
Typical Application
MIC5236
VIN IN OUT
30V
EN ERR
GND
VOUT
3.0V/100µA
IGND = 20µA
Regulator with Low IO and Low IQ
MIC5236
VIN IN OUT
5V
EN ADJ
GND
MIC5236
VIN IN OUT
VOUT
5V
EN ERR
47k
3.0V/150mA
COUT
GND
VERR
Regulator with Error Output
VOUT
3.0V/150mA
Regulator with Adjustable Output
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
November 2000
1
MIC5236
1 page  
MIC5236
Typical Characteristics
Dropout Voltage
vs. Output Current
400
300
200
100
VOUT = 98% of Nominal VOUT
MIC5236-3.0
0
0 40 80 120 160 200
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
4
MIC5236-3.0
3
2 VIN = 4V
1 VIN = 10V
0
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
0
Ground Current
vs. Supply Voltage
MIC5236-3.0
ILOAD = 10mA
1mA 100µA
10µA
1234567
SUPPLY VOLTAGE (V)
8
Ground Current
vs. Temperature
4
3
VIN = 4V
2 ILOAD = 150mA
1
MIC5236-3.0
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
November 2000
Dropout Characteristics
3.5
ILOAD = 10mA
3.0 ILOAD = 50mA
2.5
2.0
ILOAD = 150mA
1.5 ILOAD = 100mA
MIC5236-3.0
1.0
1.5 2.0 2.5 3.0 3.5
4.0
SUPPLY VOLTAGE (V)
Ground Pin Current
vs. Output Current
25
VIN = 4V
20
15 VIN = 10V
10
5
MIC5236-3.0
0
0 100 200 300 400 500
OUTPUT CURRENT (µA)
Ground Current
vs. Temperature
0.10
0.08
0.06
0.04
VIN = 4V
ILOAD = 10mA
0.02
MIC5236-3.0
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3.015
3.010
Output Voltage
vs. Temperature
MIC5236-3.0
3.005
3.000
2.995
VIN = 4V
ILOAD = 150mA
2.990
2.985
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5
Micrel
Dropout Voltage
vs. Temperature
600
500
400
300 ILOAD = 150mA
200
100
MIC5236-3.0
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Current
vs. Supply Voltage
5
MIC5236-3.0
4
ILOAD = 150mA
3
VOUT = 3V
2
1 ILOAD = 100µA
0
012345678
SUPPLY VOLTAGE (V)
Ground Current
vs. Temperature
1.2
1.0
0.8
VIN = 4V
0.6 ILOAD = 75mA
0.4
0.2
MIC5236-3.0
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
285
280
275
270
265 VOUT = 0V
260
MIC5236-3.0
255
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC5236
5 Page 
MIC5236
amount of copper can be determined by knowing the maxi-
mum power dissipation required. If the maximum ambient
temperature is 50°C and the power dissipation is as above,
632mW, the curve in Figure 7 shows that the required area of
copper is 25mm2.
The θJA of this package is ideally 63°C/W, but it will vary
depending upon the availability of copper ground plane to
which it is attached.
900
800 TJ = 125°C
700 85°C
600
50°C 25°C
500
400
300
200
100
0
0 0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
Figure 7. Copper Area vs. Power-SOP
Power Dissipation (TA)
900
800
700
600
500
400
300
200
100
0
0
0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
Figure 8. Copper Area vs. Power-MSOP
Power Dissipation (∆TJA)
Micrel
The same method of determining the heat sink area used for
the power-SOP-8 can be applied directly to the power-
MSOP-8. The same two curves showing power dissipation
versus copper area are reproduced for the power-MSOP-8
and they can be applied identically, see Figures 8 and 9.
900
800 TJ = 125°C
700 85°C 50°C 25°C
600
500
400
300
200
100
0
0 0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
Figure 9. Copper Area vs. Power-MSOP
Power Dissipation (TA)
Power MSOP-8 Thermal Characteristics
The power-MSOP-8 package follows the same idea as the
power-SO-8 package, using four ground leads with the die
attach paddle to create a single-piece electrical and thermal
conductor, reducing thermal resistance and increasing power
dissipation capability.
Quick Method
Determine the power dissipation requirements for the design
along with the maximum ambient temperature at which the
device will be operated. Refer to Figure 9, which shows safe
operating curves for three different ambient temperatures,
25°C, 50°C, and 85°C. From these curves, the minimum
amount of copper can be determined by knowing the maxi-
mum power dissipation required. If the maximum ambient
temperature is 50°C, and the power dissipation is 639mW,
the curve in Figure 9 shows that the required area of copper
is 110mm2,when using the power MSOP-8.
November 2000
11
MIC5236
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC5236-5.0BM.PDF ] | |
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