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MIC5255
150mA Low Noise µCap CMOS LDO
General Description
Features
The MIC5255 is an efficient, precise CMOS voltage
•
Input voltage range: 2.7V to 6.0V
regulator optimized for ultra-low-noise applications. It
•
Thin SOT package: 1mm height SOT-23-5
offers 1% initial accuracy, extremely-low dropout voltage
•
Ultra-low output noise: 30µV(rms)
(135mV at 150mA) and low ground current (typically
•
Stability with ceramic output capacitors
90µA). The MIC5255 provides a very-low-noise output,
•
Ultra-low dropout: 135mV @ 150mA
ideal for RF applications where a clean voltage source is
required. A noise bypass pin is also available for further
•
High output accuracy:
reduction of output noise.
– 1.0% initial accuracy
Designed specifically for handheld and battery-powered
– 2.0% over temperature
devices, the MIC5255 provides a TTL-logic-compatible en-
•
Low quiescent current: 90µA
able pin. When disabled, power consumption drops nearly
•
Tight load and line regulation
to zero.
•
TTL-Logic-controlled enable input
The MIC5255 also works with low-ESR ceramic
•
“Zero” off-mode current
capacitors, reducing the amount of board space necessary
for power applications, critical in handheld wireless
•
Thermal shutdown and current limit protection
devices.
Key features include current limit, thermal shutdown, faster
Applications
transient response, and an active clamp to speed up
device turn-off. Available in the 6-pin 2mm × 2mm MLF
®
•
Cellular phones and pagers
package, the IttyBitty
®
SOT-23-5 package and the new
•
Cellular accessories
Thin SOT-23-5, which offers the same footprint as the
•
Battery-powered equipment
standard IttyBitty
®
SOT-23-5, but only 1mm tall. The
•
Laptop, notebook, and palmtop computers
MIC5255 offers a range of output voltages.
•
Consumer/personal electronics
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
V
IN
MIC5255-x.x_M5
1
2
3
4
5
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
OUT
C
OUT
= 1.0µF
Ceramic
C
BYP
= 0.01µF
Ultra-Low-Noise Regulator Application
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
IttyBitty is a registered trademark of Micrel, Inc
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2006
1
M9999-110906
Micrel, Inc.
MIC5255
Ordering Information
Part Number
Standard
MIC5255-2.5BD5
MIC5255-2.5BM5
MIC5255-2.6BD5
MIC5255-2.6BM5
MIC5255-2.7BD5
MIC5255-2.7BM5
MIC5255-2.75BM5
MIC5255-2.8BD5
MIC5255-2.8BM5
MIC5255-2.8BML
MIC5255-2.85BD5
MIC5255-2.85BM5
MIC5255-2.85BML
MIC5255-2.9BD5
MIC5255-2.9BM5
MIC5255-3.0BD5
MIC5255-3.0BM5
MIC5255-3.0BML
MIC5255-3.1BM5
MIC5255-3.2BM5
MIC5255-3.3BD5
MIC5255-3.3BM5
MIC5255-3.3BML
MIC5255-3.5BM5
Notes:
*
**
***
Other Voltage available. Contact Micrel for details.
Under bar / Over bar symbol may not be to scale.
Over bar symbol located after Pin 1 identifier.
Marking
Pb-Free
Standard
NW25
LW25
NW26
LW26
NW27
LW27
LW2H
NW28
LW28
W28
NW2J
LW2J
W2J
NW29
LW29
NW30
LW30
W30
LW31
LW32
NW33
LW33
W33
LW35
Pb-Free**
NW25
KW25
NW26
KW26
NW27
KW27
KW2H
NW28
KW28
W28***
NW2J
KW2J
W2J***
NW29
KW29
NW30
KW30
W30***
KW31
KW32
NW33
KW33
W33***
KW35
Voltage*
2.5V
2.5V
2.6V
2.6V
2.7V
2.7V
2.75V
2.8V
2.8V
2.8V
2.85V
2.85V
2.85V
2.9V
2.9V
3.0V
3.0V
3.0V
3.1V
3.2V
3.3V
3.3V
3.3V
3.5V
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
5-Pin TSOT-23
5-Pin SOT-23
5-Pin TSOT-23
5-Pin SOT-23
5-Pin TSOT-23
5-Pin SOT-23
5-Pin SOT-23
5-Pin TSOT-23
5-Pin SOT-23
6-Pin 2x2 MLF
®
MIC5255-2.5YD5
MIC5255-2.5YM5
MIC5255-2.6YD5
MIC5255-2.6YM5
MIC5255-2.7YD5
MIC5255-2.7YM5
MIC5255-2.75YM5
MIC5255-2.8YD5
MIC5255-2.8YM5
MIC5255-2.8YML
MIC5255-2.85YD5
MIC5255-2.85YM5
MIC5255-2.85YML
MIC5255-2.9YD5
MIC5255-2.9YM5
MIC5255-3.0YD5
MIC5255-3.0YM5
MIC5255-3.0YML
MIC5255-3.1YM5
MIC5255-3.2YM5
MIC5255-3.3YD5
MIC5255-3.3YM5
MIC5255-3.3YML
MIC5255-3.5YM5
5-Pin TSOT-23
5-Pin SOT-23
6-Pin 2x2 MLF
®
5-Pin TSOT-23
5-Pin SOT-23
5-Pin TSOT-23
5-Pin SOT-23
6-Pin 2x2 MLF
®
5-Pin SOT-23
5-Pin SOT-23
5-Pin TSOT-23
5-Pin SOT-23
6-Pin 2x2 MLF
®
5-Pin SOT-23
November 2006
2
M9999-110906
Micrel, Inc.
MIC5255
Pin Configuration
E N GND IN
3
2
1
E N GND IN
3
2
1
EN 1
6 BYP
LW xx
4
5
4
N W xx
5
Wxx
GND 2
IN 3
5 NC
4 OUT
BYP
OUT
BYP
OUT
MIC5255-x.xBML
®
6-Pin 2x2 MLF (ML)
MIC5255-x.xBM5
5-Pin SOT23 (M5)
MIC5255-x.xBD5
5-Pin Thin SOT23 (D5)
E N GND IN
3
2
1
E N GND IN
3
2
1
EN 1
6 BYP
KW xx
4
5
4
N W xx
5
Wxx
GND 2
IN 3
5 NC
4 OUT
BYP
OUT
BYP
OUT
MIC5255-x.xYML
®
6-Pin 2x2 MLF (ML)
MIC5255-x.xYM5
5-Pin SOT23 (M5)
MIC5255-x.xYD5
5-Pin Thin SOT23 (D5)
Pin Description
Pin Number
SOT23-5
TSOT23-5
1
2
3
4
5
–
–
Pin Number
6-MLF
3
2
1
6
4
5
EP
IN
GND
EN
BYP
OUT
NC
GND
Supply Input.
Ground.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
Reference Bypass: Connect external 0.01µF
≤
CBYP
≤
1.0µF capacitor
to GND to reduce output noise. May be left open.
Regulator Output.
No internal connection.
Ground: Internally connected to the exposed pad. Connect externally to
GND pin.
Pin Name
Pin Name
November 2006
3
M9999-110906
Micrel, Inc.
MIC5255
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 0V to +7V
Enable 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
) .........................–60°C to +150°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
EDS Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)........................................ +2.7V to +6V
Enable Voltage (V
EN
).............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
SOT23-5 (
θ
JA
) ..................................................235°C/W
2x2 MLF-6 (
θ
JA
) .................................................90°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V, V
EN
= V
IN
; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
O
∆V
LNR
∆V
LDR
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
Condition
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 150mA
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 150mA
(6)
Min
–1
–2
Typ
Max
1
2
Units
%
%
%/V
%
mV
mV
mV
mV
µA
µA
µA
dB
dB
dB
mV
µV(rms)
0.02
1.5
0.1
90
135
0.2
90
117
60
60
50
160
425
30
0.05
2.5
5
150
200
250
1
150
I
Q
I
GND
PSRR
Quiescent Current
Ground Pin Current
Ripple Rejection
(8)
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 150mA
f = 10Hz, C
OUT
= 1.0µF, C
BYP
= 0.01µF
f = 100Hz, V
IN
= V
OUT
+1
f = 10kHz, V
IN
= V
OUT
+1
I
LIM
e
n
Enable Input
V
IL
V
IH
I
EN
Current Limit
Output Voltage Noise
V
OUT
= 0V
C
OUT
= 1.0µF, C
BYP
= 0.01µF,
f = 10Hz to 100kHz
V
IN
= 2.7V to 5.5V, regulator shutdown
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤
0.4V, regulator shutdown
V
IH
≥
1.6V, regulator enabled
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
Shutdown Resistance Discharge
0.4
1.6
0.01
0.01
500
150
10
V
V
µA
µA
Ω
°C
°C
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
November 2006
4
M9999-110906
单片机
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