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Электронный компонент: MIC5255

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August, 2004
1
M0385-080204
MIC5255
Micrel
MIC5255
150mA Low Noise
Cap 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 90
A). 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 MLFTM 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: 30
V(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: 90
A
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
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
IttyBitty is a registered trademark of Micrel, Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
Typical Application
C
OUT
= 1.0
F
C
IN
= 1.0
F
Ceramic
Ceramic
1
5
2
3
4
C
BYP
= 0.01
F
Enable
Shutdown
EN
V
OUT
MIC5255-x.xBM5
EN (pin 3) may be
connected directly
to IN (pin 1).
V
IN
MIC5255-x.xBML
1
EN
6
C
BYP
(optional)
V
IN
V
OUT
C
OUT
5
4
2
3
ENABLE
SHUTDOWN
Ultra-Low-Noise Regulator Application
MIC5255
Micrel
August, 2004
2
M0385-080204
Ordering Information
Part Number Marking Voltage Temperature Range Package
Standard
Pb-Free Standard Pb-Free
MIC5255-2.5BM5 MIC5255-2.5YM5 LW25 LW25 2.5V 40
C to +125
C SOT-23-5
MIC5255-2.6BM5 MIC5255-2.6YM5 LW26 LW26 2.6V 40
C to +125
C SOT-23-5
MIC5255-2.7BM5 MIC5255-2.7YM5 LW27 LW27 2.7V 40
C to +125
C SOT-23-5
MIC5255-2.8BM5 MIC5255-2.8YM5 LW28 LW28 2.8V 40
C to +125
C SOT-23-5
MIC5255-2.8BML MIC5255-2.8YML W28 W28 2.8V 40
C to +125
C 6-Pin 2
2 MLFTM
MIC5255-2.85BM5 MIC5255-2.85YM5 LW2J LW2J 2.85V 40
C to +125
C SOT-23-5
MIC5255-2.9BM5 MIC5255-2.9YM5 LW29 LW29 2.9V 40
C to +125
C SOT-23-5
MIC5255-3.0BM5 MIC5255-3.0YM5 LW30 LW30 3.0V 40
C to +125
C SOT-23-5
MIC5255-3.0BML MIC5255-3.0YML W30 W30 3.0V 40
C to +125
C 6-Pin 2
2 MLFTM
MIC5255-3.1BM5 MIC5255-3.1YM5 LW31 LW31 3.1V 40
C to +125
C SOT-23-5
MIC5255-3.2BM5 MIC5255-3.2YM5 LW32 LW32 3.2V 40
C to +125
C SOT-23-5
MIC5255-3.3BM5 MIC5255-3.3YM5 LW33 LW33 3.3V 40
C to +125
C SOT-23-5
MIC5255-2.6BD5
MIC5255-2.6YD5 NW26 NW26 2.6V 40
C to +125
C TSOT-23-5
MIC5255-2.7BD5
MIC5255-2.7YD5 NW27 NW27 2.7V 40
C to +125
C TSOT-23-5
MIC5255-2.8BD5
MIC5255-2.8YD5 NW28 NW28 2.8V 40
C to +125
C TSOT-23-5
MIC5255-2.85BD5 MIC5255-2.85YD5 NW2J NW2J 2.85V 40
C to +125
C TSOT-23-5
MIC5255-2.9BD5
MIC5255-2.9YD5 NW29 NW2J 2.9V 40
C to +125
C TSOT-23-5
MIC5255-3.0BD5
MIC5255-3.0YD5 NW30 NW2J 3.0V 40
C to +125
C TSOT-23-5
MIC5255-3.3BD5
MIC5255-3.3YD5 NW33 NW2J 3.3V 40
C to +125
C TSOT-23-5
August, 2004
3
M0385-080204
MIC5255
Micrel
Pin Configuration
IN
OUT
BYP
EN
LWxx
1
3
4
5
2
GND
MIC5255-x.xBM5
(SOT-23-5)
IN
OUT
BYP
EN
NWxx
1
3
4
5
2
GND
MIC5255-x.xBD5
(TSOT-23-5)
IN
OUT
BYP
EN
KWxx
1
3
4
5
2
GND
MIC5255-x.xYM5
(SOT-23-5)
1
EN
GND
IN
6 BYP
NC
OUT
5
4
2
3
MIC5255-x.xBML
6-Pin 2mm


2mm MLFTM (ML)
(Top View)
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
SOT-23-5
6-MLFTM
TSOT-23-5
1
3
IN
Supply Input.
2
2
GND
Ground.
3
1
EN
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4
6
BYP
Reference Bypass: Connect external 0.01
F
C
BYP
1.0
F capacitor to
GND to reduce output noise. May be left open.
5
4
OUT
Regulator Output
5
NC
No internal connection.
EP
GND
Ground: Internally connected to the exposed pad. Connect externally to
GND pin.
MIC5255
Micrel
August, 2004
4
M0385-080204
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V, V
EN
= V
IN;
I
OUT
= 100
A; T
J
= 25
C, bold values indicate 40
C
T
J
+125
C; unless noted.
Symbol
Parameter
Conditions
Min
Typical
Max
Units
V
O
Output Voltage Accuracy
I
OUT
= 100
A
1
1
%
2
2
%
V
LNR
Line Regulation
V
IN
= V
OUT
+ 1V to 6V
0.02
0.05
%/V
V
LDR
Load Regulation
I
OUT
= 0.1mA to 150mA
(6)
1.5
2.5
%
V
IN
V
OUT
Dropout Voltage
(7)
I
OUT
= 100
A
0.1
5
mV
I
OUT
= 100mA
90
150
mV
I
OUT
= 150mA
135
200
mV
250
mV
I
Q
Quiescent Current
V
EN
0.4V (shutdown)
0.2
1
A
I
GND
Ground Pin Current
(8)
I
OUT
= 0mA
90
150
A
I
OUT
= 150mA
117
A
PSRR
Ripple Rejection
f = 10Hz, C
OUT
= 1.0
F, C
BYP
= 0.01
F
60
dB
f = 100Hz, V
IN
= V
OUT
+1
60
dB
f = 10kHz, V
IN
= V
OUT
+1
50
dB
I
LIM
Current Limit
V
OUT
= 0V
160
425
mA
e
n
Output Voltage Noise
C
OUT
= 1.0
F, C
BYP
= 0.01
F,
30
V(rms)
f = 10Hz to 100kHz
Enable Input
V
IL
Enable Input Logic-Low Voltage
V
IN
= 2.7V to 5.5V, regulator shutdown
0.4
V
V
IH
Enable Input Logic-High Voltage
V
IN
= 2.7V to 5.5V, regulator enabled
1.6
V
I
EN
Enable Input Current
V
IL
0.4V, regulator shutdown
0.01
A
V
IH
1.6V, regulator enabled
0.01
A
Shutdown Resistance Discharge
500
Thermal Protection
Thermal Shutdown Temperature
150
C
Thermal Shutdown Hysteresis
10
C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D
(max) = (T
J
(max)T
A
)/
JA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
JA
of the MIC5255-x.xBM5 (all
versions) is 235
C/W on a PC board. See
"Thermal Considerations"
section for further details.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range
from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
7. Dropout Voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differen-
tial. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating
voltage is 2.7V.
8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) .................................. 0V to +7V
Enable Input Voltage (V
EN
) ................................. 0V to +7V
Power Dissipation (P
D
) ........................ Internally Limited
(3)
Junction Temperature (T
J
) ....................... 40
C to +125
C
Storage Temperature (T
S
) ....................... 65
C to +150
C
Lead Temperature (soldering, 5 sec.) ....................... 260
C
ESD
(4) ..............................................................................................
2kV
Operating Ratings
(2)
Input Voltage (V
IN
) ......................................... +2.7V to +6V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... 40
C to +125
C
Thermal Resistance
SOT-23
(
JA
) ..................................................... 235
C/W
2
2 MLFTM
(
JA
) .................................................. 90
C/W
August, 2004
5
M0385-080204
MIC5255
Micrel
Typical Characteristics
0
10
20
30
40
50
60
70
10
100
1000
10000
100000
1000000
PSRR (dB)
FRQUENCY (Hz)
100
A*
50mA*
100mA*
150mA*
Power Supply Rejection Ratio
*I
LOAD
C
OUT
= 1
F Ceramic
0
10
20
30
40
50
60
70
10
100
1000
10000
100000
1000000
PSRR (dB)
FRQUENCY (Hz)
100
A*
50mA*
100mA*
150mA*
Power Supply Rejection Ratio
* I
LOAD
C
OUT
= 4.7
F Ceramic
0
10
20
30
40
50
60
70
10
100
1000
10000
100000
1000000
PSRR (dB)
FRQUENCY (Hz)
0
F*
0.01
F*
0.1
F*
1.0
F*
Power Supply Rejection Ratio
* C
BYP
I
LOAD
= 50mA
V
IN
= V
OUT
+ 0.5V
C
OUT
= 1
F Ceramic
0
10
20
30
40
50
60
70
80
0
200
400
600
800
1000
PSRR (dB)
VOLTAGE DROP (mV)
PSRR vs. Voltage Drop
I
LOAD
= 100
A
I
LOAD
= 150mA
C
OUT
= 1
F
C
BYP
= 0.01
F
100
105
110
115
120
125
130
0.1
1
10
100
1000
GROUND CURRENT (
A)
OUTPUT CURRENT (mA)
Ground Pin Current
V
IN
= V
OUT
+ 1V
95
97
99
101
103
105
107
109
111
113
115
-40 -20 0 20 40 60 80 100120140
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
I
LOAD
= 100
A
95
100
105
110
115
120
125
-40 -20 0 20 40 60 80 100120140
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
I
LOAD
= 150mA
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
I
LOAD
= 100
A
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
I
LOAD
= 150mA
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout Characteristics
I
LOAD
= 150mA
I
LOAD
= 100
A
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
-40 -20 0 20 40 60 80 100120140
DROPOUT VOLTAGE (mV)
TEMPERATURE (
C)
Dropout Voltage
I
LOAD
= 100
A
0
10
20
30
40
50
60
70
0
200
400
600
800
1000
PSRR (dB)
VOLTAGE DROP (mV)
PSRR vs. Voltage Drop
I
LOAD
= 100
A
I
LOAD
= 150mA
C
OUT
= 1
F
C
BYP
= 0