MIC5205
150 mA Low-Noise LDO Regulator
Features
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Ultra-Low Noise Output
High Output Voltage Accuracy
Guaranteed 150 mA Output
Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current and Thermal Limiting
Reverse-Battery Protection
Zero Off-Mode Current
Logic-Controlled Electronic Enable
Cellular Telephones
Laptop, Notebook, and Palmtop Computers
Battery-Powered Equipment
PCMCIA V
CC
and V
PP
Regulation/Switching
Consumer/Personal Electronics
SMPS Post-Regulator and DC/DC Modules
High-Efficiency Linear Power Supplies
General Description
The MIC5205 is an efficient linear voltage regulator
with ultra low-noise output, very low dropout voltage
(typically 17 mV at light loads and 165 mV at 150 mA),
and very low ground current (600 µA at 100 mA
output). The MIC5205 offers better than 1% initial
accuracy.
Designed especially for hand-held, battery-powered
devices, the MIC5205 includes a CMOS or TTL
compatible enable/shutdown control input. When shut
down, power consumption drops nearly to zero.
Regulator ground current increases only slightly in
dropout, further prolonging battery life.
Key MIC5205 features include a reference bypass pin
to improve its already excellent low-noise performance,
reversed-battery protection, current limiting, and
overtemperature shutdown.
The MIC5205 is available in fixed and adjustable output
voltage versions in a small SOT-23-5 package.
For low-dropout regulators that are stable with ceramic
output capacitors, see the µCap MIC5245/6/7 family.
Applications
Package Type
MIC5205
5-Lead SOT-23 (M5)
EN GND IN
3
2
1
EN GND IN
3
2
1
LBxx
KBxx
4
5
Pb-Free
Marking
LBAA
KBAA
4
5
Part
Identification
BYP
OUT
ADJ
OUT
2017 Microchip Technology Inc.
DS20005785A-page 1
MIC5205
Typical Application Circuit
MIC5205
5-Lead SOT-23
V
IN
MIC5205-x.xYM5
1
2
Enable
Shutdown
3
4
5
V
OUT
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C
OUT
= 2.2μF
tantalum
Low-Noise Operation:
C
BYP
C
BYP
= 470pF, C
OUT
≥
2.2μF
Basic Operation:
C
BYP
= not used, C
OUT
≥
1μF
Functional Block Diagrams
Ultra-Low Noise Fixed Regulator
V
IN
IN
BYP
C
BYP
(optional)
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5205-x.xYM5
GND
OUT
V
OUT
C
OUT
Ultra-Low Noise Adjustable
Regulator
V
IN
IN
OUT
V
OUT
C
OUT
ADJ
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5205YM5
GND
V
OUT
= V
REF
(1 + R2/R1)
R1
R2
C
BYP
(optional)
DS20005785A-page 2
2017 Microchip Technology Inc.
MIC5205
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Input Voltage (V
IN
) .......................................................................................................................... –20V to +20V
Enable Input Voltage (V
EN
) ......................................................................................................................... –20V to +20V
Power Dissipation (P
D
) (Note
1)
............................................................................................................ Internally Limited
Operating Ratings ‡
Supply Input Voltage (V
IN
) ......................................................................................................................... +2.5V to +16V
Enable Input 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 at 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 reg-
ulator will go into thermal shutdown. The
JA
of the MIC5205-xxYM5 (all versions) is 220°C/W mounted on
a PC board.
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
V
IN
= V
OUT
+1V; I
L
= 100 µA; C
L
= 1.0 µF; V
EN
≥
2.0V; T
J
= +25°C,
bold
values indicate
–40°C < T
J
< +125°C, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Symbol
V
O
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
Min.
–1
–2
—
—
—
—
—
—
—
—
Dropout Voltage,
Note 3
V
IN
– V
O
—
—
—
—
—
Quiescent Current
I
GND
—
—
Typ.
—
—
40
0.004
—
0.02
—
10
—
110
—
140
—
165
—
0.01
—
Max.
1
2
—
0.012
0.05
0.2
0.5
50
70
150
230
250
300
275
350
1
5
Units
%
ppm/°C
%/V
%
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
Conditions
Variation from specified V
OUT
Note 1
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1 mA to 150 mA,
Note 2
I
L
= 100 µA
I
L
= 50 mA
I
L
= 100 mA
I
L
= 150 mA
V
EN
≤
0.4V (shutdown)
V
EN
≤
0.18V (shutdown)
2017 Microchip Technology Inc.
DS20005785A-page 3
MIC5205
TABLE 1-1:
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
V
IN
= V
OUT
+1V; I
L
= 100 µA; C
L
= 1.0 µF; V
EN
≥
2.0V; T
J
= +25°C,
bold
values indicate
–40°C < T
J
< +125°C, unless noted.
Parameter
Symbol
Min.
—
—
—
Ground Pin Current,
Note 4
I
GND
—
—
—
—
—
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
ENABLE Input
Enable Input Logic-Low
Voltage
Enable Input Logic-High
Voltage
V
IL
V
IH
I
IL
Enable Input Current
I
IH
Note 1:
2:
—
—
2.0
—
—
2
—
—
—
—
0.01
—
5
—
0.4
0.18
—
–1
–2
20
25
µA
V
V
Regulator shutdown
Regulator enabled
V
IL
≤
0.4V
V
IL
≤
0.18V
V
IL
= 2.0V
V
IL
= 2.0V
PSRR
I
LIMIT
∆V
O
/∆
PD
e
NO
—
—
—
—
Typ.
80
—
350
—
600
—
1300
—
75
320
0.05
260
Max.
125
150
600
800
1000
1500
1900
2500
—
500
—
—
Units
µA
µA
µA
µA
µA
µA
µA
µA
dB
mA
%/W
nV/√Hz
Conditions
V
EN
≥
2.0V, I
L
= 100 µA
I
L
= 50 mA
I
L
= 100 mA
I
L
= 150 mA
Frequency = 100 Hz, I
L
= 100 µA
V
OUT
= 0V
Note 5
I
L
= 50 mA, C
L
= 2.2 µF, 470 pF
from BYP to GND
3:
4:
5:
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are
tested for load regulation in the load range from 0.1 mA to 150 mA. Changes in output voltage due to heat-
ing 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.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current
drawn from the supply is the sum of the load current plus the ground pin current.
Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipa-
tion is applied, excluding load or line regulation effects. Specifications are for a 150 mA load pulse at V
IN
=
16V for t = 10 ms.
DS20005785A-page 4
2017 Microchip Technology Inc.
MIC5205
TEMPERATURE SPECIFICATIONS (Note
1)
Parameters
Temperature Ranges
Junction Operating Temperature
Range
Storage Temperature Range
Lead Temperature
Package Thermal Resistances
Thermal Resistance SOT-23-5
Note 1:
JA
JC
—
—
220
130
—
—
°C/W
°C/W
Note 2
—
T
J
T
S
—
–40
–65
—
—
—
—
+125
+150
+260
°C
°C
°C
—
—
Soldering, 5s
Sym.
Min.
Typ.
Max.
Units
Conditions
2:
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.
The maximum allowable power dissipation at 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 reg-
ulator will go into thermal shutdown. The
JA
of the MIC5205-xxYM5 (all versions) is 220°C/W mounted on
a PC board.
2017 Microchip Technology Inc.
DS20005785A-page 5
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