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PDF MIC5219-3.3BM5 Data sheet ( Hoja de datos )
| Número de pieza | MIC5219-3.3BM5 | |
| Descripción | 500mA-Peak Output LDO Regulator | |
| Fabricantes | Micrel Semiconductor | |
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MIC5219
Micrel
MIC5219
500mA-Peak Output LDO Regulator
General Description
The MIC5219 is an efficient linear voltage regulator with high
peak output current capability, very low dropout voltage, and
better than 1% output voltage accuracy. Dropout is typically
10mV at light loads and less than 500mV at full load.
The MIC5219 is designed to provide a peak output current for
startup conditions where higher inrush current is demanded.
It features a 500mA peak output rating. Continuous output
current is limited only by package and layout.
The MIC5219 can be enabled or shut down by a CMOS or
TTL compatible signal. When disabled, power consumption
drops nearly to zero. Dropout ground current is minimized to
help prolong battery life. Other key features include reversed-
battery protection, current limiting, overtemperature shut-
down, and low noise performance with an ultra-low-noise
option.
The MIC5219 is available in adjustable or fixed output volt-
ages in space-saving SOT-23-5 and MM8™ 8-lead power
MSOP packages. For higher power requirements see the
MIC5209 or MIC5237.
Features
• Guaranteed 500mA-peak output over the full operating
temperature range
• Low 500mV maximum dropout voltage at full load
• Extremely tight load and line regulation
• Tiny SOT-23-5 and MM8™ power MSOP-8 package
• Ultra-low-noise output
• Low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• CMOS/TTL-compatible enable/shutdown control
• Near-zero shutdown current
Applications
• Laptop, notebook, and palmtop computers
• Cellular telephones and battery-powered equipment
• Consumer and personal electronics
• PC Card VCC and VPP regulation and switching
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Typical Applications
ENABLE
SHUTDOWN
VIN 6V
VOUT 5V
2.2µF
tantalum
MIC5219-5.0BMM
18
27
36
45
470pF
5V Ultra-Low-Noise Regulator
VIN 4V
ENABLE
SHUTDOWN
MIC5219-3.3BM5
15
2
34
VOUT 3.3V
2.2µF
tantalum
470pF
3.3V Ultra-Low-Noise Regulator
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 2000
1
MIC5219
1 page  
MIC5219
Typical Characteristics
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
-80 IOUT = 100µA
COUT = 1µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
IOUT = 100µA
-80 COUT = 2.2µF
CBYP = 0.01µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Power Supply Ripple Rejection
vs. Voltage Drop
60
50
1mA
40
30 10mA IOUT = 100mA
20
10
COUT = 1µF
0
0 0.1 0.2 0.3 0.4
VOLTAGE DROP (V)
Noise Performance
10
1 100mA
0.1 10mA
0.01
0.001
VOUT = 5V
COUT = 10µF
1mA
electrolytic
0.0001
1E10+1 11E0+02 1E1k+3 11E0+k4 1E00+k5 1E1M+6 11E0+M7
FREQUENCY (Hz)
July 2000
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
-80 IOUT = 1mA
COUT = 1µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
IOUT = 1mA
-80 COUT = 2.2µF
CBYP = 0.01µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Power Supply Ripple Rejection
vs. Voltage Drop
100
90
80 1mA
70
60
50 IOUT = 100mA
40 10mA
30
20 COUT = 2.2µF
10 CBYP = 0.01µF
0
0 0.1 0.2 0.3 0.4
VOLTAGE DROP (V)
Noise Performance
10
1
100mA
0.1
0.01 VOUT = 5V
1mA
0.001
COUT = 10µF
electrolytic
10mA
CBYP = 100pF
0.0001
1E10+1 11E0+02 1E1k+3 11E0+k4 1E00+k5 1E1M+6 11E0+M7
FREQUENCY (Hz)
5
Micrel
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
-80 IOUT = 100mA
COUT = 1µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Power Supply
Rejection Ratio
0
VIN = 6V
-20 VOUT = 5V
-40
-60
IOUT = 100mA
-80 COUT = 2.2µF
CBYP = 0.01µF
-100
1E1+01 11E0+02 1E1+k3 11E0+k4 11E0+05k 1E1M+6 1E0M+7
FREQUENCY (Hz)
Noise Performance
10
10mA, COUT = 1µF
1
0.1
0.01
0.001
0.0001
VOUT = 5V
1E10+1 11E0+02 1E1+k3 11E0+k4 11E0+05k 11EM+6 11E0+M7
FREQUENCY (Hz)
Dropout Voltage
vs. Output Current
400
300
200
100
00 100 200 300 400 500
OUTPUT CURRENT (mA)
MIC5219
5 Page 
MIC5219
PD × 50mA = 0.875 × 173mW
PD × 50mA = 151mW
The power dissipation at 500mA must also be calculated.
PD × 500mA = (5V – 3.3V) 500mA + 5V × 20mA
PD × 500mA = 950mW
This number must be multiplied by the duty cycle at which it
would be operating, 12.5%.
PD × = 0.125 × 950mW
PD × = 119mW
The total power dissipation of the device under these condi-
tions is the sum of the two power dissipation figures.
PD(total) = PD × 50mA + PD × 500mA
PD(total) = 151mW + 119mW
PD(total) = 270mW
The total power dissipation of the regulator is less than the
maximum power dissipation of the SOT-23-5 package at
room temperature, on a minimum footprint board and there-
fore would operate properly.
Multilayer boards with a ground plane, wide traces near the
pads, and large supply-bus lines will have better thermal
conductivity.
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Designing P.C. Board Heat Sinks”,
included in Micrel’s Databook. For a full discussion of heat
sinking and thermal effects on voltage regulators, refer to
Regulator Thermals section of Micrel’s Designing with Low-
Dropout Voltage Regulators handbook.
Fixed Regulator Circuits
MIC5219-x.x
VIN
IN OUT
VOUT
EN BYP
GND
1µF
Figure 5. Low-Noise Fixed Voltage Regulator
Figure 5 shows a basic MIC5219-x.xBMX fixed-voltage regu-
lator circuit. A 1µF minimum output capacitor is required for
basic fixed-voltage applications.
MIC5219-x.x
VIN
IN OUT
VOUT
EN BYP
GND
2.2µF
470pF
Micrel
Figure 6. Ultra-Low-Noise Fixed Voltage Regulator
Figure 6 includes the optional 470pF noise bypass capacitor
between BYP and GND to reduce output noise. Note that the
minimum value of COUT must be increased when the bypass
capacitor is used.
Adjustable Regulator Circuits
MIC5219
VIN
IN OUT
VOUT
EN ADJ
GND
R1
1µF
R2
Figure 7. Low-Noise Adjustable Voltage Regulator
Figure 7 shows the basic circuit for the MIC5219 adjustable
regulator. The output voltage is configured by selecting
values for R1 and R2 using the following formula:
VOUT
=
1.242V
R2
R1
+ 1
Although ADJ is a high-impedance input, for best perfor-
mance, R2 should not exceed 470kΩ.
MIC5219
VIN
IN OUT
EN ADJ
GND
VOUT
R1
2.2µF
R2
470pF
Figure 8. Ultra-Low-Noise Adjustable Application.
Figure 8 includes the optional 470pF bypass capacitor from
ADJ to GND to reduce output noise.
July 2000
11
MIC5219
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC5219-3.3BM5.PDF ] | |
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