MIC5323
High PSRR Low Noise 300mA µCap
Ultra-Low Dropout LDO Regulator
General Description
The MIC5323 is a high-performance, 300mA LDO regula-
tor, offering extremely high PSRR and very low noise while
consuming low ground current.
Ideal for battery operated applications, the MIC5323
features 2% accuracy, extremely low dropout voltage
(120mV @ 300mA), and low ground current at light load
(typically 90µA). When disabled, the MIC5323 typically
consumes less than 1µA.
The MIC5323 is a µCap design operating with small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5323 is available in
fixed
output voltages and
adjustable output voltages in the super compact
6-pin 2mm × 2mm Thin MLF
®
and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
Ultra low dropout voltage of 120mV @ 300mA
Input voltage range: 2.65 to 5.5V
Stable with ceramic output capacitor
300mA guaranteed output current
Low output noise — 20µVrms
High PSRR, up to 80dB @1kHz
Less than 30µs turn-on time with C
BYP
= 0.1µF
High output accuracy: ±2.0% over temperature
Thermal shutdown protection
Current limit protection
6-pin 2mm × 2mm Thin MLF
®
package
Thin SOT-23-5 package
Applications
Cellular phones
Notebook and Tablet Computers
Fiber optic modules
Portable electronics
Instrumentation Systems
Audio Codec power supplies
Typical Application
Power Supply Rejection Ratio
(C
BYP
= 0.1µF)
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
-80
-90
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
I
OUT
= 300mA
I
OUT
= 100mA
I
OUT
= 1mA
-100
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
MicroLeadFrame
and MLF are trademarks of Amkor, 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 2011
1
M9999-110311B
Micrel, Inc.
MIC5323
Ordering Information
Part Number
(1)
MIC5323-1.8YMT
MIC5323-2.8YMT
MIC5323-3.3YMT
MIC5323YMT
MIC5323-1.8YD5
MIC5323-2.8YD5
MIC5323-3.3YD5
Notes:
1. For other output voltage and/or temperature options, contact Micrel marketing.
2. Underbar/Overbar symbols may not be to scale.
3. Pin 1 identifier for 2x2 Thin MLF is “▲” symbol.
®
Marking
(2)
23G
23M
23S
23A
2318
2328
2333
Voltage
1.8V
2.8V
3.3V
ADJ
1.8V
2.8V
3.3V
Junction
Temp. Range
(2)
–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
(3)
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
6-Pin 2mm x 2mm Thin MLF
®
Thin SOT23-5
Thin SOT23-5
Thin SOT23-5
November 2011
2
M9999-110311B
Micrel, Inc.
MIC5323
Pin Configuration
®
MIC5323-x.xYMT (Fixed) 6-Pin 2mm x 2mm Thin MLF (MT)
(Top View)
MIC5323YMT (Adjustable) 6-Pin 2mm x 2mm Thin MLF
®
(MT)
(Top View)
MIC5323-x.xYD5 (Fixed)TSOT-23-5 (D5)
(Top View)
Pin Description
Pin Number
Thin MLF
®
-6
Adjustable
1
2
3
4
5
–
6
EPAD
Pin Number
Thin MLF
®
-6
Fixed
1
2
3
4
–
5
6
EPAD
Pin Number
TSOT23-5
Fixed
3
2
1
5
–
–
4
–
Pin
Name
EN
GND
VIN
VOUT
ADJ
NC
BYP
EPAD
Pin Description
Enable Input: Active High. High = on, low = off. Do not leave
floating.
Ground.
Supply Input.
Output Voltage.
Adjust Input: Connect to external resistor voltage divider
network.
No connection for
fixed
voltage parts.
Reference Bypass: Connect external 0.1µF capacitor to GND for
reduced output noise. May be left open.
Exposed Heatsink Pad: Connect to ground plane for
performance enhancement.
November 2011
3
M9999-110311B
Micrel, Inc.
MIC5323
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................... 0V to 6V
Enable Input Voltage (V
EN
)..................................... 0V to 6V
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Junction Temperature (T
J
) ........................–40°C to +125°C
Lead Temperature (soldering, 5sec.)......................... 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply voltage (V
IN
) ....................................... 2.65V to 5.5V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
2mm x 2mm Thin MLF
®
6 pin (θ
JA
)....................93°C/W
TSOT-23-5 (θ
JA
) ..............................................235°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1.0V; C
OUT
= 2.2µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to +125°C, unless noted.
Parameter
Ouput Voltage Accuracy
Line Regulation
Load Regulation
(6)
Dropout Voltage
Condition
Variation from nominal V
OUT
, I
OUT
= 100µA to 300mA
V
IN
= V
OUT
+1V to 5.5V
I
OUT
= 100µA to 300mA
I
OUT
= 50mA, V
OUT
> 2.8V
I
OUT
= 150mA, V
OUT
> 2.8V
I
OUT
= 300mA, V
OUT
> 2.8V
I
OUT
= 50mA, V
OUT
=< 2.8V
I
OUT
= 150mA, V
OUT
=< 2.8V
I
OUT
= 300mA, V
OUT
=< 2.8V
Ground Pin Current
(7)
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
Turn-On Time
Enable Input Voltage
Enable Input Current
Notes:
1.
2.
3.
4.
5.
6.
7.
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 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.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
Regulation is measured at constant junction temperature using low duty cycle pulse testing, changes in output voltage due to heating effects
are covered by the thermal regulation specification.
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.
Min
–2.0
Typ
0.02
0.1
20
60
120
25
75
150
90
0.5
80
65
Max
+2.0
0.3
0.5
35
85
170
45
110
220
150
2
Units
%
%/V
%
mV
mV
mV
mV
mV
mV
µA
µA
dB
dB
I
OUT
= 0 to 300mA
V
EN
= 0V
f = 1kHz; C
OUT
= 2.2µF ceramic; C
BYP
= 0.1µF
f = 10kHz; C
OUT
= 2.2µF ceramic; C
BYP
= 0.1µF
V
OUT
= 0V
C
OUT
=2.2µF, C
BYP
= 0.1µF, 10Hz to 100kHz
C
OUT
= 2.2µF; C
BYP
= 0.1µF; I
OUT
= 300mA
Logic Low
Logic High
V
IL
≤
0.2V
V
IH
≥
1.2V
1.2
350
600
20
30
900
150
0.2
mA
µVrms
µs
V
V
µA
µA
0.01
0.01
1
1
November 2011
4
M9999-110311B
Micrel, Inc.
MIC5323
Typical Characteristics
Power Supply Rejection Ratio
(C
BYP
=1µF)
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
-80
-90
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
I
OUT
= 1mA
I
OUT
= 100mA
I
OUT
= 300mA
Power Supply Rejection Ratio
(C
BYP
= 0.1µF)
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
-80
-90
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
I
OUT
= 300mA
Power Supply Rejection Ratio
(C
BYP
= 0.01µF)
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
-80
-90
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
I
OUT
= 300mA
I
OUT
= 100mA
I
OUT
= 100mA
I
OUT
= 1mA
I
OUT
= 1mA
-100
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
-100
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
-100
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
110
GROUND CURRENT (µA)
100
90
80
Ground Current vs.
Input Voltage
110
GROUND CURRENT (µA)
I
OUT
= 300mA
Ground Current vs.
Output Current
GROUND CURRENT (µA)
100
90
80
70
60
50
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
110
100
90
80
Ground Current vs.
Temperature
I
OUT
= 300mA
I
OUT
= 100mA
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 100µA
70
60
50
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
V
OUT
= 1.8V
70
60
50
V
IN
= V
OUT
+ 1V
V
OUT
= 1.8V
0
50
100
150
200
250
300
-40
-20
0
20
40
60
80
100 120
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
3.5
OUTPUT VOLTAGE (V)
Output Voltage vs.
Input Voltage
Current Limit vs.
Input Voltage
800
700
Dropout Voltage vs.
Output Current
160
140
DROPOUT (mV)
120
100
80
60
40
20
V
OUT
= 1.8V
3.0
I
OUT
= 100µA
CURRENT LIMIT (mA)
V
OUT
= 2.8V
600
500
400
300
200
100
2.5
I
OUT
= 150mA
2.0
I
OUT
= 300mA
V
OUT
= 2.8V
1.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
0
50
100
150
200
250
300
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
November 2011
5
M9999-110311B
微控制器 MCU
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