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PDF MIC5255-3.1YM5 Data sheet ( Hoja de datos )
| Número de pieza | MIC5255-3.1YM5 | |
| Descripción | 150mA Low Noise UCap CMOS LDO | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC5255
Micrel
MIC5255
150mA Low Noise µCap CMOS LDO
General Description
The MIC5255 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. It offers 1% initial
accuracy, extremely-low dropout voltage (135mV at 150mA)
and low ground current (typically 90µA). The MIC5255 pro-
vides a very-low-noise output, ideal for RF applications
where a clean voltage source is required. A noise bypass pin
is also available for further reduction of output noise.
Designed specifically for handheld and battery-powered de-
vices, the MIC5255 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5255 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up device
turn-off. Available in the 6-pin 2mm × 2mm MLF™ package,
the IttyBitty® SOT-23-5 package and the new Thin SOT-23-
5, which offers the same footprint as the standard IttyBitty®
SOT-23-5, but only 1mm tall. The MIC5255 offers a range of
output voltages.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
• Input voltage range: 2.7V to 6.0V
• Thin SOT package: 1mm height SOT-23-5
• Ultra-low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
1.0% initial accuracy
2.0% over temperature
• Low quiescent current: 90µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
Typical Application
CIN = 1.0µF VIN
Ceramic
Enable
Shutdown
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
MIC5255-x.xBM5
15
2
34
VOUT
COUT = 1.0µF
Ceramic
ENABLE
SHUTDOWN
CBYP = 0.01µF
VIN
EN
MIC5255-x.xBML
16
25
34
CBYP
(optional)
Ultra-Low-Noise Regulator Application
VOUT
COUT
IttyBitty is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000• http://www.micrel.com
August, 2004
1
M0385-080204
1 page  
MIC5255
Typical Characteristics
Power Supply Rejection Ratio
70
60
50
40 100µA*
50mA*
30 100mA*
20 150mA*
*ILOAD
10 COUT = 1µF Ceramic
0
FRQUENCY (Hz)
PSRR vs. Voltage Drop
70
60 ILOAD = 100µA
50
40 ILOAD = 150mA
30
20
10 COUT = 1µF
CBYP = 0
00 200 400 600 800 1000
VOLTAGE DROP (mV)
Ground Pin Current
115
113
111
109
107
105
103
101
99
97
I
LOAD
=
100µA
9-540 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Ground Pin Current
140
120
100
80
60
40
20
I = 150mA
LOAD
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
August, 2004
Power Supply Rejection Ratio
70
60
50
40 100µA*
50mA*
30 100mA*
20 150mA*
* ILOAD
10 COUT = 4.7µF Ceramic
0
FRQUENCY (Hz)
PSRR vs. Voltage Drop
80
70 ILOAD = 100µA
60
50
40
30 ILOAD = 150mA
20
10
COUT = 1µF
CBYP = 0.01µF
00 200 400 600 800 1000
VOLTAGE DROP (mV)
Ground Pin Current
125
120
115
110
105
100
I = 150mA
LOAD
9-540 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Dropout Characteristics
3.5
3
I
LOAD
=
100µA
2.5
2
I = 150mA
LOAD
1.5
1
0.5
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
5
Micrel
Power Supply Rejection Ratio
70
60
50 0µF*
40 0.01µF*
0.1µF*
30 1.0µF*
20
* CBYP
ILOAD = 50mA
10 VIN = VOUT + 0.5V
0 COUT = 1µF Ceramic
FRQUENCY (Hz)
Ground Pin Current
130
125
120
115
110
105
1000.1
VIN = VOUT + 1V
1 10 100 1000
OUTPUT CURRENT (mA)
Ground Pin Current
140
120
100
80
60
40
20
I
LOAD
=
100µA
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
Dropout Voltage
0.14
0.12
0.1
0.08
0.06
0.04
0.02
I
LOAD
=
100µA
-040 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
M0385-080204
5 Page 
MIC5255
Package Information (continued)
Micrel
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
SIDE VIEW
6-Pin MLF™ (ML)
Rev. 02
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
August, 2004
11
M0385-080204
11 Page | ||
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