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PDF MIC39101-5.0BM Data sheet ( Hoja de datos )
| Número de pieza | MIC39101-5.0BM | |
| Descripción | 1A Low-Voltage Low-Dropout Regulator | |
| Fabricantes | Micrel Semiconductor | |
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MIC39100/39101/39102
Micrel
MIC39100/39101/39102
1A Low-Voltage Low-Dropout Regulator
General Description
The MIC39100, MIC39101, and MIC39102 are 1A low-
dropout linear voltage regulators that provide low-voltage,
high-current output from an extremely small package. Utiliz-
ing Micrel’s proprietary Super βeta PNP™ pass element, the
MIC39100/1/2 offers extremely low dropout (typically 410mV
at 1A) and low ground current (typically 11mA at 1A).
The MIC39100 is a fixed output regulator offered in the
SOT-223 package. The MIC39101 and MIC39102 are fixed
and adjustable regulators, respectively, in a thermally en-
hanced power 8-lead SOP (small outline package).
The MIC39100/1/2 is ideal for PC add-in cards that need to
convert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to
1.8V. A guaranteed maximum dropout voltage of 630mV over
all operating conditions allows the MIC39100/1/2 to provide
2.5V from a supply as low as 3.13V and 1.8V from a supply
as low as 2.43V.
The MIC39100/1/2 is fully protected with overcurrent limiting,
thermal shutdown, and reversed-battery protection. Fixed
voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available on
MIC39100/1 with adjustable output voltages to 1.24V on
MIC39102.
For other voltages, contact Micrel.
Features
• Fixed and adjustable output voltages to 1.24V
• 410mV typical dropout at 1A
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V conversion
• 1A minimum guaranteed output current
• 1% initial accuracy
• Low ground current
• Current limiting and thermal shutdown
• Reversed-battery protection
• Reversed-leakage protection
• Fast transient response
• Low-profile SOT-223 package
• Power SO-8 package
Applications
• LDO linear regulator for PC add-in cards
• PowerPC™ power supplies
• High-efficiency linear power supplies
• SMPS post regulator
• Multimedia and PC processor supplies
• Battery chargers
• Low-voltage microcontrollers and digital logic
Ordering Information
Part Number
MIC39100-1.8BS
MIC39100-2.5BS
MIC39100-3.3BS
MIC39100-5.0BS
MIC39101-1.8BM
MIC39101-2.5BM
MIC39101-3.3BM
MIC39101-5.0BM
MIC39102BM
Voltage
1.8V
2.5V
3.3V
5.0V
1.8V
2.5V
3.3V
5.0V
Adj.
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-223
SOT-223
SOT-223
SOT-223
SOP-8
SOP-8
SOP-8
SOP-8
SOP-8
Typical Applications
VIN
3.3V
MIC39100
IN OUT
GND
2.5V
10µF
tantalum
VIN
3.3V
ENABLE
SHUTDOWN
100k
MIC39101
IN OUT
EN FLG
GND
R1
Error
Flag
Output
2.5V
10µF
tantalum
VIN
2.5V
ENABLE
SHUTDOWN
MIC39102
IN OUT
EN ADJ
GND
R1
R2
1.5V
10µF
tantalum
2.5V/1A Regulator
2.5V/1A Regulator with Error Flag
1.5V/1A Adjustable Regulator
Super βeta PNP is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
1 MIC39100/39101/39102
1 page  
MIC39100/39101/39102
Typical Characteristics
Power Supply
Rejection Ratio
80
VIN = 5V
VOUT = 3.3V
60
40
20 IOUT = 1A
COUT = 10µF
CIN = 0
0
1E1+01 11E0+02 1E1+k3 11E0+k4 11E00+k5 11EM+6
FREQUENCY (Hz)
Power Supply
Rejection Ratio
80
VIN = 3.3V
VOUT = 2.5V
60
40
20 IOUT = 1A
COUT = 47µF
CIN = 0
0
1E10+1 11E0+02 1E1+k3 11E0+k4 11E00+k5 11EM+6
FREQUENCY (Hz)
Dropout Characteristics
(2.5V)
2.8
2.6 ILOAD =100mA
2.4
2.2
2.0 ILOAD =750mA
1.8 ILOAD =1A
1.6
1.4
2
2.3 2.6 2.9 3.2 3.5
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage (2.5V)
2.0
1.8
1.6 ILOAD =100mA
1.4
1.2
1.0
0.8
0.6 ILOAD =10mA
0.4
0.2
0
02468
SUPPLY VOLTAGE (V)
June 2000
Power Supply
Rejection Ratio
80
VIN = 5V
VOUT = 3.3V
60
40
20 IOUT = 1A
COUT = 47µF
CIN = 0
0
1E1+01 11E0+02 1E1+k3 11E0+k4 11E00+k5 11EM+6
FREQUENCY (Hz)
500
450
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
vs. Output Current
2.5V
3.3V
1.8V
T
A
=
25°C
250 500 750 1000 1250
OUTPUT CURRENT (mA)
Dropout Characteristics
(3.3V)
3.6
3.4 ILOAD =100mA
3.2
3.0
ILOAD =750mA
2.8
ILOAD =1A
2.6
2.4
2.8
3.2 3.6 4.0
SUPPLY VOLTAGE (V)
4.4
Ground Current
vs. Supply Voltage (2.5V)
35
30
25
20 ILOAD =1A
15
10
5
0
02468
SUPPLY VOLTAGE (V)
5
Micrel
Power Supply
Rejection Ratio
80
VIN = 3.3V
VOUT = 2.5V
60
40
20 IOUT = 1A
COUT = 10µF
CIN = 0
0
1E1+01 11E0+02 1E1+k3 11E0+k4 11E00+k5 11EM+6
FREQUENCY (Hz)
Dropout Voltage
vs. Temperature
600
550 ILOAD = 1A
500 1.8V
3.3V
450
400 2.5V
350
300
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Current
vs. Output Current
14
12
10 1.8V
8 2.5V
6 3.3V
4
2
00 200 400 600 800 1000
OUTPUT CURRENT (mA)
Ground Current
vs. Supply Voltage (3.3V)
1.4
1.2
1.0 ILOAD =100mA
0.8
0.6 ILOAD =10mA
0.4
0.2
0
02468
SUPPLY VOLTAGE (V)
MIC39100/39101/39102
5 Page 
MIC39100/39101/39102
∆T = TJ(max) – TA(max)
TJ(max) = 125°C
TA(max) = maximum ambient operating temperature
For example, the maximum ambient temperature is 50°C, the
∆T is determined as follows:
∆T = 125°C – 50°C
∆T = 75°C
Using Figure 4, the minimum amount of required copper can
be determined based on the required power dissipation.
Power dissipation in a linear regulator is calculated as fol-
lows:
PD = (VIN – VOUT) IOUT + VIN · IGND
If we use a 2.5V output device and a 3.3V input at an output
current of 1A, then our power dissipation is as follows:
PD = (3.3V – 2.5V) × 1A + 3.3V × 11mA
PD = 800mW + 36mW
PD = 836mW
From Figure 4, the minimum amount of copper required to
operate this application at a ∆T of 75°C is 160mm2.
Micrel
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 5, 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 as above,
836mW, the curve in Figure 5 shows that the required area of
copper is 160mm2.
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.
June 2000
11 MIC39100/39101/39102
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC39101-5.0BM.PDF ] | |
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