MIC5255
150 mA Low Noise µCap CMOS LDO
Features
•
•
•
•
•
•
Input Voltage Range: 2.7V to 6.0V
Thin SOT Package: 1 mm Height SOT-23-5
Ultra-Low Output Noise: 30 µV
RMS
Stability with Ceramic Output Capacitors
Ultra-Low Dropout: 135 mV @ 150 mA
High output accuracy:
- 1.0% Initial Accuracy
- 2.0% Over Temperature
Low Quiescent Current: 90 µA
Tight Load and Line Regulation
TTL-Logic-Controlled Enable Input
“Zero” Off-Mode Current
Thermal Shutdown and Current-Limit Protection
Cellular Telephones and Pagers
Cellular Accessories
Battery-Powered Equipment
Laptop. Notebook, and Palmtop Computers
Consumer/Personal Electronics
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 (135 mV at 150 mA) and low ground current
(typically 117 µA at full load). The MIC5255 provides 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 devices, 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 2 mm × 2 mm
VDFN package, the SOT-23-5 package and the Thin
SOT-23-5, which offers the same footprint as the
standard SOT-23-5, but is only 1 mm tall. The MIC5255
offers a range of output voltages.
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•
•
•
•
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•
•
•
•
Applications
Package Types
MIC5255-x.xYM5
5-Pin SOT-23 (M5)
(Top View)
E N GND IN
3
2
1
MIC5255-x.xYD5
5-Pin TSOT23 (D5)
(Top View)
E N GND IN
3
2
1
MIC5255-x.xYML
6-Pin VDFN (ML)
(Top View)
EN
1
6
BYP
Wxx
KWxx
4
5
4
NWxx
5
GND
2
IN
3
5
NC
4
OUT
BYP
OUT
BYP
OUT
2016 Microchip Technology Inc.
DS20005661A-page 1
MIC5255
Typical Application Schematic
MIC5255-
X
.
X
5-P
IN
SOT-23
C
IN
= 1.0μF
Ceramic
Enable
Shutdown
MIC5255-
X
.
X
6-P
IN
2
X
2 VDFN
V
OUT
C
OUT
= 1.0μF
Ceramic
C
BYP
= 0.01μF
V
IN
ENABLE
SHUTDOWN
V
IN
MIC5255-x.x_M5
1
2
3
4
5
MIC5255-x.xYML
1
2
3
6
5
4
V
OUT
C
BYP
C
OUT
(optional)
EN
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
U
LTRA
-L
OW
-N
OISE
R
EGULATOR
A
PPLICATION
Block Diagram
IN
Reference
Voltage
Startup/
Shutdown
Control
Q
uickstart/
Noise
Cancellation
EN
BYP
Thermal
Sensor
Under-
voltage
Lockout
FAU LT
Error
Amplifier
Current
Amplifier
OU T
ACTIV E SHU TDO W N
GND
DS20005661A-page 2
2016 Microchip Technology Inc.
MIC5255
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
IN
) ......................................................................................................................................... 0V to +7V
Enable Voltage (V
EN
) ........................................................................................................................................ 0V to +7V
Power Dissipation (P
D
,
Note 1)
.............................................................................................................. Internally Limited
ESD Rating (Note
2)
.................................................................................................................................................. 2 kV
Operating Ratings ‡
Supply Voltage (V
IN
) .................................................................................................................................... +2.7V to +6V
Enable Voltage (V
EN
) ..........................................................................................................................................0V to V
IN
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice:
The device is not guaranteed to function outside its operating ratings.
Note 1:
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
.
Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the reg-
ulator will go into thermal shutdown. The
θ
JA
of the MIC5255-x.xYM5 (all versions) is 235°C/W on a PC
board. See the
Thermal Considerations
section for further details.
2:
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with
100 pF.
2016 Microchip Technology Inc.
DS20005661A-page 3
MIC5255
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
V
IN
= V
OUT
+ 1V, V
EN
= V
IN
; I
OUT
= 100 µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
(Note
1).
Parameters
Output Voltage Accuracy
Line Regulation
Load Regulation
Sym.
V
O
∆V
LNR
∆V
LDR
Min.
–1
–2
—
—
—
Dropout Voltage,
Note 3
V
IN
–
V
OUT
—
—
—
Quiescent Current
Ground Pin Current,
Note 4
I
Q
I
GND
—
—
—
—
Ripple Rejection
PSRR
—
—
Current Limit
Output Voltage Noise
Enable Input
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Note 1:
2:
—
—
—
—
150
10
—
—
°C
°C
—
—
V
IL
V
IH
I
EN
—
—
1.6
—
—
—
—
—
0.01
0.01
500
0.4
—
—
—
—
V
V
µA
µA
Ω
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
—
I
LIM
e
n
160
—
Typ.
—
—
0.02
1.5
0.1
90
135
—
0.2
90
117
60
60
50
425
30
Max.
1
2
0.05
2.5
5
150
200
250
5
150
—
—
—
—
—
—
mA
µV
RMS
dB
µA
µA
mV
Units
%
%/V
Conditions
I
OUT
= 100 µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1 mA to 150 mA;
Note 2
I
OUT
= 100 µA
I
OUT
= 100 mA
I
OUT
= 150 mA
V
EN
≤
0.4V (shutdown)
I
OUT
= 0 mA
I
OUT
= 150 mA
f = 10 Hz, C
OUT
= 1.0 µF,
C
BYP
= 0.01 µF
f = 100 Hz, V
IN
= V
OUT
+1V
f = 10 kHz, V
IN
= V
OUT
+1V
V
OUT
= 0V
C
OUT
= 1.0 µF, C
BYP
= 0.01 µF,
f = 10 Hz to 100 kHz
%
3:
4:
Specification for packaged product only.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are
tested for load regulation in the load range from 1.0 mA to 150 mA. Changes in output voltage due to
heating effects are covered by the thermal regulation specification.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its
nominal value measured at 1V differential. 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.
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.
DS20005661A-page 4
2016 Microchip Technology Inc.
MIC5255
TEMPERATURE SPECIFICATIONS
Parameters
Temperature Ranges
Junction Operating Temperature
Range
Storage Temperature
Lead Temperature
Package Thermal Resistances
Thermal Resistance, SOT-23-5
Thermal Resistance, 2x2 VDFN-6
Note 1:
JA
JA
—
—
235
90
—
—
°C/W
°C/W
—
—
T
J
T
S
—
–40
–60
—
—
—
—
+125
+150
+260
°C
°C
°C
Note 1
—
Soldering, 5s
Sym.
Min.
Typ.
Max.
Units
Conditions
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., T
A
, T
J
,
JA
). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
2016 Microchip Technology Inc.
DS20005661A-page 5
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