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PDF MIC5245-3.3BM5 Data sheet ( Hoja de datos )
| Número de pieza | MIC5245-3.3BM5 | |
| Descripción | 150mA Cap CMOS LDO Regulator Preliminary Information | |
| Fabricantes | Micrel Semiconductor | |
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MIC5245
Micrel
MIC5245
150mA µCap CMOS LDO Regulator
Preliminary Information
General Description
The MIC5245 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. The MIC5245 of-
fers better than 1% initial accuracy, extremely low dropout
voltage (typically 150mV at 150mA) and constant ground
current over load (typically 100µA). The MIC5245 provides a
very low noise output, ideal for RF applications where quiet
voltage sources are required. A noise bypass pin is also
available for further reduction of output noise.
Designed specifically for hand-held and battery-powered
devices, the MIC5245 provides a TTL logic compatible en-
able pin. When disabled, power consumption drops nearly to
zero.
The MIC5245 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a push-
pull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the IttyBitty™ SOT-23-5
and power MSO-8 packages, the MIC5245 also offers a
range of fixed output voltages.
Features
• Ultralow dropout—100mV @ 100mA
• Ultralow noise—30µV(rms)
• Stability with tantalum or ceramic capacitors
• Load independent, ultralow ground current
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
• “Zero” off-mode current
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA VCC and VPP regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Typical Application
Ordering Information
Part Number
Marking Voltage
MIC5245-2.5BM5
LS25
2.5V
MIC5245-2.7BM5
LS27
2.7V
MIC5245-2.8BM5
LS28
2.8V
MIC5245-2.85BM5
LS2J
2.85V
MIC5245-3.0BM5
LS30
3.0V
MIC5245-3.1BM5
LS31
3.1V
MIC5245-3.3BM5
LS33
3.3V
MIC5245-3.3BMM
— 3.3V
Other voltages available. Contact Micrel for details.
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
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
MSOP-8
VIN
MIC5245-x.xBM5
15
VOUT
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
o IN (pin 1).
2
3
COUT
4
CBYP
(optional)
ENABLE
SHUTDOWN
VIN
VOUT
COUT
MIC5245-3.3MM
18
27
36
45
CBYP
(OPTIONAL)
Ultra-Low-Noise Regulator Application
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
MIC5245
1 page  
MIC5245
Micrel
Ground Pin Current
95
VIN = 4V
VOUT = 3V
90
805.1 1 10 100 500
LOAD CURRENT (mA)
Ground Pin Current
200
VIN = 4V
150 VOUT = 3V
100
50
IOUT = 100µA
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Ground Pin Current
150
VIN = 4V
125 VOUT = 3V
100
75
IOUT = 150mA
50-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Ground Pin Current
100
VOUT = 3V
75
50
25
IOUT = 100µA
00 1 2 3 4 5
INPUT VOLTAGE (V)
Ground Pin Current
100
VOUT = 3V
75
50
25
IOUT = 150mA
00 1 2 3 4 5
INPUT VOLTAGE (V)
Dropout Characteristics
3.5
3.0 VOUT = 3V
2.5 RL = 30kΩ
2.0 RL = 30Ω
1.5
1.0
0.5
00 1 2 3 4 5
INPUT VOLTAGE (V)
Dropout Voltage
300
250
200 TA = 125°C
150
TA = 25°C
100
50 TA = -40°C
00 25 50 75 100 125 150
OUTPUT CURRENT (mA)
June 2000
Dropout Voltage
8
ILOAD = 100µA
6
4
2
0-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Short Circuit Current
600
500
400
300 VIN = 3.5V
200 VEN = 3V
100
0-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
5
Dropout Voltage
300
IL = 150mA
250
200
150
100
50
0-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Output Voltage
vs. Temperature
3.05
3.00
VIN = 4V
TYPICAL 3V DEVICE
2.95
2.90
2.85-50
ILOAD = 100µA
0 50 100 150
TEMPERATURE (°C)
MIC5245
5 Page 
MIC5245
Micrel
June 2000
11
MIC5245
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC5245-3.3BM5.PDF ] | |
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