MIC5205
Micrel
MIC5205
150mA Low-Noise LDO Regulator
General Description
The MIC5205 is an efficient linear voltage regulator with ultra-
low-noise output, very low dropout voltage (typically 17mV at
light loads and 165mV at 150mA), and very low ground
current (600µA at 100mA 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 shutdown, power consump-
tion 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, re-
versed-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.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ultra-low-noise output
High output voltage accuracy
Guaranteed 150mA 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/dc-to-dc modules
High-efficiency linear power supplies
Applications
For low-dropout regulators that are stable with ceramic
output capacitors, see the
µ
Cap MIC5245/6/7 family.
Ordering Information
Part Number
MIC5205BM5
MIC5205-2.5BM5
MIC5205-2.7BM5
MIC5205-2.8BM5
MIC5205-2.85BM5
MIC5205-2.9BM5
MIC5205-3.0BM5
MIC5205-3.3BM5
MIC5205-3.6BM5
MIC5205-3.8BM5
MIC5205-4.0BM5
MIC5205-5.0BM5
Marking
LBAA
LB25
LB27
LB28
LB2J
LB29
LB30
LB33
LB36
LB38
LB40
LB50
Voltage
Adj
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.3V
3.6V
3.8V
4.0V
5.0V
Accuracy
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
Junction Temp. Range*
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available. Contact Micrel for details.
Typical Application
V
IN
MIC5205-x.xBM5
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
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
1
MIC5205
MIC5205
Micrel
Pin Configuration
EN GND IN
3
2
1
EN GND IN
3
2
1
LBxx
4
5
4
LBAA
5
Part
Identification
BYP
OUT
ADJ
OUT
MIC5205-x.xBM5
Fixed Voltages
MIC5205BM5
Adjustable Voltage
Pin Description
MIC5205-x.x
(fixed)
1
2
3
4
4
5
5
MIC5205
(adjustable)
1
2
3
Pin Name
IN
GND
EN
BYP
ADJ
OUT
Pin Function
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown.
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open.
Adjust (Input): Adjustable regulator feedback input. Connect to resistor
voltage divider.
Regulator Output
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage (V
IN
) ............................ –20V to +20V
Enable Input Voltage (V
EN
) ........................... –20V to +20V
Power Dissipation (P
D
) ............... Internally Limited,
Note 3
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Junction Temperature (T
J
) ....................... –40°C to +125°C
Storage Temperature (T
S
) ....................... –65°C to +150°C
Operating Ratings
(Note 2)
Input Voltage (V
IN
) ....................................... +2.5V to +16V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... –40°C to +125°C
Thermal Resistance, SOT-23-5
(θ
JA
) .......................
Note 3
MIC5205
2
June 2000
MIC5205
Micrel
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 100µA; C
L
= 1.0µF; V
EN
≥
2.0V; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
O
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
V
IN
– V
O
Parameter
Output Voltage Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage,
Note 6
Conditions
variation from specified V
OUT
Note 4
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 150mA,
Note 5
I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
I
GND
I
GND
Quiescent Current
Ground Pin Current,
Note 7
V
EN
≤
0.4V (shutdown)
V
EN
≤
0.18V (shutdown)
V
EN
≥
2.0V, I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
PSRR
I
LIMIT
∆V
O
/∆P
D
e
no
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
frequency = 100Hz, I
L
= 100µA
V
OUT
= 0V
Note 8
I
L
= 50mA, C
L
= 2.2µF,
470pF from BYP to GND
Min
–1
–2
40
0.004
0.02
10
110
140
165
0.01
80
350
600
1300
75
320
0.05
260
500
0.012
0.05
0.2
0.5
50
70
150
230
250
300
275
350
1
5
125
150
600
800
1000
1500
1900
2500
Typical
Max
1
2
Units
%
%
ppm/°C
%/V
%/V
%
%
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
dB
mA
%/W
nV/ Hz
ENABLE Input
V
IL
V
IH
I
IL
I
IH
Note 1.
Note 2.
Note 3:
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
regulator shutdown
regulator enabled
V
IL
≤
0.4V
V
IL
≤
0.18V
V
IH
≥
2.0V
V
IH
≥
2.0V
2.0
0.01
2
5
0.4
0.18
V
V
V
µA
µA
µA
µA
–1
–2
20
25
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
The maximum allowable power dissipation at 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 regulator will go into thermal shutdown. The
θ
JA
of the MIC5205-
xxBM5 (all versions) is 220°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
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 0.1mA to 150mA. 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.
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 dissipation is applied, excluding load or line
regulation effects. Specifications are for a 150mA load pulse at V
IN
= 16V for t = 10ms.
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
June 2000
3
MIC5205
MIC5205
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
PSRR (dB)
-40
-60
-80
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
RIPPLE REJECTION (dB)
V
IN
= 6V
V
OUT
= 5V
Power Supply Ripple Rejection
vs. Voltage Drop
60
50
40
30
20
10
0
0
C
OUT
= 1µF
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
1mA
10mA
I
OUT
= 100mA
I
OUT
= 100µA
C
OUT
= 1µF
I
OUT
= 100µA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0
-20
PSRR (dB)
-40
-60
-80
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
RIPPLE REJECTION (dB)
V
IN
= 6V
V
OUT
= 5V
Power Supply Ripple Rejection
vs. Voltage Drop
100
90
80
70
60
50
40
30
20
10
0
I
OUT
= 100mA
10mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
1mA
I
OUT
= 1mA
C
OUT
= 1µF
I
OUT
= 1mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0
-20
PSRR (dB)
-40
-60
-80
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
10000
V
IN
= 6V
V
OUT
= 5V
Turn-On Time
vs. Bypass Capacitance
TIME (µs)
I
OUT
= 10mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
1000
100
I
OUT
= 10mA
C
OUT
= 1µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
10
10
100
1000
CAPACITANCE (pF)
10000
0
-20
PSRR (dB)
-40
-60
-80
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
320
DROPOUT VOLTAGE (mV)
Dropout Voltage
vs. Output Current
280
240
200
160
120
80
40
0
0
40
80
120
160
OUTPUT CURRENT (mA)
–40°C
+125°C
+25°C
V
IN
= 6V
V
OUT
= 5V
I
OUT
= 100mA
C
OUT
= 1µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
I
OUT
= 100mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
MIC5205
4
June 2000
MIC5205
Micrel
Typical Characteristics
Noise Performance
10
10mA, C
OUT
= 1µF
1
NOISE (µV/√Hz)
NOISE (µV/√Hz)
0.1
0.01
0.001
V
OUT
= 5V
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
1mA
C
OUT
= 1µF
C
BYP
= 10nF
1
0.1
0.01
0.001
10
Noise Performance
10
100mA
NOISE (µV/√Hz)
10mA
1
Noise Performance
10mA
0.1
0.01
100mA
V
OUT
= 5V
C
OUT
= 10µF
electrolytic
1mA
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
V
OUT
= 5V
C
OUT
= 22µF
1mA
0.001
tantalum
C
BYP
= 10nF
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Noise Performance
10
1
NOISE (µV/√Hz)
0.1
1mA
V
OUT
= 5V
C
OUT
= 10µF
0.001 electrolytic
10mA
C
BYP
= 100pF
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0.01
10
1
NOISE (µV/√Hz)
0.1
0.01
0.001
Noise Performance
10
10mA
100mA
1
NOISE (µV/√Hz)
Noise Performance
100mA
100mA
0.1
0.01
0.001
1mA
V
OUT
= 5V
C
OUT
= 10µF
electrolytic
C
BYP
= 10nF
10mA
V
OUT
= 5V
C
OUT
= 10µF
electrolytic
C
BYP
= 1nF
1mA
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
June 2000
5
MIC5205
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