MIC5252
Micrel
MIC5252
150mA High PSRR, Low Noise
µ
Cap CMOS LDO
General Description
The MIC5252 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 90µA). The MIC5252 pro-
vides a very-low-noise output, ideal for RF applications
where a clean voltage source is required. The MIC5252 has
a high PSRR even at low supply voltages, critical for battery
operated electronics. A noise bypass pin is also available for
further reduction of output noise.
Designed specifically for handheld and battery-powered de-
vices, the MIC5252 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5252 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. The MIC5252 is available in the 6-pin 2mm
×
2mm
MLF™ package and the IttyBitty® SOT-23-5 package in a
wide range of output voltages.
Features
•
•
•
•
•
•
Input voltage range: 2.7V to 6.0V
PSRR = 50dB @ V
O
+ 0.3V
Ultra-low output noise: 30µV(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: 90µA
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
Typical Application
MIC5252-x.xBM5
1
2
3
4
5
V
IN
C
IN
= 1.0µF
Ceramic
Enable
Shutdown
V
IN
V
OUT
C
OUT
= 1.0µF
Ceramic
C
BYP
= 0.01µF
MIC5252-x.xBML
1
2
3
6
5
4
V
OUT
C
BYP
(optional)
ENABLE
SHUTDOWN
EN
C
OUT
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
December 2003
1
M0394-121003
MIC5252
Micrel
Ordering Information
Part Number
MIC5252-1.8BM5
MIC5252-2.5BM5
MIC5252-2.8BM5
MIC5252-2.85BM5
MIC5252-3.0BM5
MIC5252-4.75BM5
MIC5252-2.8BML
MIC5252-2.85BML
MIC5252-3.0BML
Marking
L618
L625
L628
L62J
L630
L64H
628
62J
630
Voltage
1.8V
2.5V
2.8V
2.85V
3.0V
4.75V
2.8V
2.85V
3.0V
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
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
6-Pin 2×2 MLF™
6-Pin 2×2 MLF™
6-Pin 2×2 MLF™
Other voltages available. Contact Micrel for details.
Pin Configuration
EN GND IN
3
2
1
EN 1
GND 2
6 BYP
5 NC
4 OUT
L6xx
4
5
BYP
OUT
IN 3
MIC5252-x.xBM5
SOT-23-5 (M5)
(Top View)
MIC5252-x.xBML
6-Pin 2mm
×
2mm MLF™ (ML)
(Top View)
Pin Description
Pin Number
SOT-23-5
1
2
3
4
5
–
–
Pin Number
6-MLF™
3
2
1
6
4
5
EP
Pin Name
IN
GND
EN
BYP
OUT
NC
GND
Pin Function
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
≤
C
BYP
≤
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.
M0394-121003
2
December 2003
MIC5252
Micrel
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 ............................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD
(4) ..............................................................................................
2kV
Electrical Characteristics
(5)
Symbol
V
O
∆V
LNR
∆V
LDR
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(7)
Conditions
I
OUT
= 100µA
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
(θ
JA
) .....................................................235°C/W
2x2 MLF™
(θ
JA
) .................................................. 90°C/W
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.
Min
–1
–3
0.02
0.6
0.1
90
135
0.2
90
117
63
48
48
250
425
30
Typical
Max
1
3
0.05
1.5
5
150
200
250
1
150
200
Units
%
%
%/V
%
mV
mV
mV
mV
µA
µA
µA
dB
dB
dB
mA
µV(rms)
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 150mA
(6)
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 150mA
I
Q
I
GND
PSRR
Quiescent Current
Ground Pin Current
(8)
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 150mA
f = 10Hz, C
OUT
= 1.0µF, C
BYP
= 0.01µF
f = 10Hz, V
IN
= V
OUT
+ 0.3V
f = 10kHz, V
IN
= V
OUT
+ 0.3V
Ripple Rejection; I
OUT
= 150mA
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
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
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
1.6
0.01
0.01
500
0.4
V
V
µA
µA
Ω
°C
°C
1
1
Shutdown Resistance Discharge
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
150
10
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
)/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 MIC5252-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.
December 2003
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M0394-121003
MIC5252
Micrel
Typical Characteristics
PSRR with Bypass Variation
(V
IN
= V
OUT
+ 0.3V)
PSRR with Bypass Cap
Variation (V
IN
= V
OUT
+ 1V)
10nF
1µF
PSRR with Load Variation
90
80
70
PSRR (dB)
100µA
90
80
70
PSRR (dB)
60
50
40
30
20
10
90
80
70
PSRR (dB)
60
50
40
30
20
10
100nF 1µF
100nF
60
50
40
30
20
C
C
OUT
BYP
0nF
150mA
10nF
0nF
C
OUT
= 1µF Ceramic
V
IN
= V
OUT
+ 0.3V
V
OUT
= 2.8V
Load = 150mA
C
OUT
= 1µF Ceramic
= 1µF Ceramic
= 10nF
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
Load = 150mA
0
10
10k 100k
1k
100
FREQUENCY (Hz)
1M
0
10
10k 100k
100
1k
FREQUENCY (Hz)
1M
10
10
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
10k 100k
1k
100
FREQUENCY (Hz)
1M
PSRR
at 100Hz
90
OUTPUT VOLTAGE (V)
2.85
Output Voltage
vs. Load Current
2.84
OUTPUT VOLTAGE (V)
2.82
2.8
2.78
2.76
2.74
2.72
2.83
2.81
2.79
2.77
2.75
2.73
2.71
2.69
2.67
2.65
0
2.8V
OUT
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
Output Voltage
vs. Temperature
80
70
PSRR (dB)
100µA
60
50
40
30
20
10
0
100
200
300
400
500
150mA
C
OUT
= 1µF
C
BYP
= 10nF
V
OUT
2.8V
1000
600
700
800
900
0
100µA
2.7
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
VOLTAGE DROP (mV)
Ground Current
vs. Output Current
140
GROUND CURRENT (µA)
GROUND CURRENT (µA)
120
100
80
60
40
20
0
0
2.8V
OUT
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
160
140
120
100
Ground Current
vs. Temperature
120
GROUND CURRENT (µA)
150mA Load
100
80
60
40
20
Ground Current
vs. Supply Voltage
1µA Load
100µA Load
0µA Load
80 0mA Load
60
40
20
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
140
GROUND CURRENT (µA)
Dropout Characteristics
3
200
180
160
140
120
100
80
60
40
20
Dropout
vs. Temperature
DROPOUT VOLTAGE (mV)
10mA Load
OUTPUT VOLTAGE (V)
120
100
80
60
40
20
2.5
2
1.5
1
0.5
100µA
150mA
150mA Load
2.8V
OUT
I
L
= 150mA
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SUPPLY VOLTAGE (V)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
M0394-121003
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December 2003
MIC5252
Micrel
Dropout
vs. Output Current
200
Enable Threshold
vs. Supply Voltage
1.4
ENABLE THRESHOLD (V)
ENABLE THRESHOLD (V)
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2
SUPPLY VOLTAGE (V)
Enable Off
Enable On
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
Enable Threshold
vs. Temperature
V
= 5V
180
160
DROPOUT (mV)
140
120
100
80
60
40
20
0
0
2.8V
OUT
IN
V
IN
= 3.8V
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
0.6
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Short Circuit Current
vs. Input Supply Voltage
SHORT CIRCUIT CURRENT (mA)
500
450
400
350
300
250
200
150
100
50
0
2.7
2.8V
OUT
3.2 3.7 4.2 4.7 5.2
SUPPLY VOLTAGE (V)
December 2003
5
M0394-121003
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