MIC5303
Single 300mA CMOS
Ultra Small ULDO™
General Description
The MIC5303 is an ultra small, Ultra Low Dropout CMOS
regulator, ULDO™ that is ideal for today’s most demand-
ing portable applications including cellular phone RF
power, camera modules, imaging sensors for digital still
and video cameras, PDAs, portable media players (PMP)
and PC cameras where board space is limited. It offers
extremely low dropout voltage, very low output noise and
can operate from a 2.3V to 5.5V input while delivering up
to 300mA.
It offers 2% initial accuracy, low ground current (typically
85µA total), thermal and current limit protection. The
MIC5303 can also be put into a zero-off-mode current
state, drawing no current when disabled.
The MIC5303 is available in the ultra small 4-pin 1.2mm x
1.6mm Thin MLF
®
package, occupying only 1.92mm
2
of
PCB area, a 50% reduction in board area compared to
SC-70 and 2mm x 2mm MLF
®
packages. It’s operating
junction temperature range is –40°C to +125°C and is
available in fixed output voltages in lead-free (RoHS
compliant) Thin MLF
®
package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
Ultra Small 1.2mm x 1.6mm Thin MLF
®
package
Low Dropout Voltage: 100mV at 300mA
Output noise 120µVrms
Input voltage range: 2.3V to 5.5V
300mA guaranteed output current
Stable with ceramic output capacitors
Low quiescent current 85µA total
35µs turn-on time
High output accuracy
– ±2% initial accuracy
– ±3% over temperature
•
Thermal shutdown and current limit protection
Applications
•
•
•
•
•
•
Mobile Phones
PDAs
GPS Receivers
Portable Media Players
Portable Electronics
Digital Still & Video Cameras
Typical Application
MIC5303-x.xYMT
150
VIN
EN
VOUT
Dropout Voltage
vs. Output Current
125
100
1µF
GND
1µF
75
50
25
V
OUT
= 2.8V
C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
RF LDO Application
0
0
ULDO is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademarks of Amkor Technology, 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
May 2008
M9999-051508-D
Micrel, Inc.
MIC5303
Block Diagram
VIN
EN
V
REF
Quick-
Start
VOUT
Error
LDO
Amp
Thermal
Shutdown
Current
Limit
GND
MIC5303 Block Diagram
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MIC5303
Ordering Information
(1)
Part Number
MIC5303-1.5YMT
MIC5303-1.8YMT
MIC5303-2.1YMT
MIC5303-2.5YMT
MIC5303-2.6YMT
MIC5303-2.8YMT
MIC5303-2.85YMT
MIC5303-2.9YMT
MIC5303-3.0YMT
MIC5303-3.3YMT
Note:
1. Other voltages available. Contact Micrel Marketing for details.
Marking Code
1M5
1M8
2M1
2M5
2M6
2M8
2MN
2M9
3M0
3M3
Voltage
1.5V
1.8V
2.1V
2.5V
2.6V
2.8V
2.85V
2.9V
3.0V
3.3V
Temperature 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
Package
4-Pin 1.2mm x 1.6mm Thin MLF
®
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
4-Pin 1.2mm x 1.6mm Thin MLF
®
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
4-Pin 1.2mm x 1.6mm Thin MLF
®
Pin Configuration
EN
1
4
VOUT
GND
2
3
VIN
4-Pin 1.2mm x 1.6mm Thin MLF
®
(MT)
Pin Description
Pin Number
1
2
3
4
HS Pad
Pin Name
EN
GND
VIN
VOUT
EPAD
Pin Function
Enable Input. Active High. High = on, low = off. Do not leave floating.
Ground
Supply Input
Output Voltage
Exposed heatsink pad connected to ground internally.
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MIC5303
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 0V to +6V
Enable Input (V
EN
) ................................................ 0V to +6V
Power Dissipation
(3)
...................................Internally Limited
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
(2)
Supply voltage (V
IN
) ..................................... +2.3V to +5.5V
Enable Input (V
EN
) .................................................. 0V to V
IN
Junction Temperature (T
A
) ........................ –40°C to +125°C
Junction Thermal Resistance
Thin MLF
®
-4 (θ
JA
) ...........................................173°C/W
Electrical Characteristics
(4)
V
IN
= V
OUT
+ 1V; C
OUT
= 1.0µF; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
(5)
Dropout Voltage
(6)
Condition
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +125°C
V
IN
= V
OUT
+1V to 5.5V; I
OUT
= 100µA
I
OUT
= 100µA to 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 300mA
I
OUT
= 0 to 300mA, EN = High
V
EN
= 0V
f = up to 1kHz; C
OUT
= 1.0µF
f = 1kHz – 20kHz; C
OUT
= 1.0µF
V
OUT
= 0V
C
OUT
=1µF, 10Hz to 100kHz
Logic Low
Logic High
V
IL
< 0.2V
V
IH
> 1.0V
C
OUT
= 1.0µF
Min
–2
–3
0.02
0.5
0.1
15
50
100
85
0.1
65
42
350
460
120
850
Typ
Max
+2
+3
0.3
0.6
2.0
35
100
200
120
2
Units
%
%
%/V
%
mV
mV
mV
mV
µA
µA
dB
dB
mA
µV
RMS
V
V
µA
µA
µs
Ground Pin Current
(7)
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
Turn-on Time
Notes:
0.2
1.1
0.01
0.01
35
100
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.
4. Specification for packaged product only.
5. 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.
6. 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.
7. 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.
May 2008
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MIC5303
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Output Current
90
88
86
84
82
80
78
76
74
72
70
Ground Pin Current
vs. Temperature
300mA
100
90
80
70
Ground Pin Current
vs. Supply Voltage
300mA
100µA
100µA
60
50
40
30
20
10
0
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
5.5
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
20 40 60 80
TEMPERATURE (°C)
-80
-70
-60
Power Supply
Rejection Ratio
50mA
160
Dropout Voltage
vs. Temperature
300mA
V
OUT
= 2.8V
140 C
OUT
= 1µF
120
100
80
60
40
20
1,000
0
150
125
100
Dropout Voltage
vs. Output Current
150mA
-50
300mA
-40
-30
-20
V
IN
= V
OUT
+ 1V
-10 V
OUT
= 2.8V
C
OUT
= 1µF
0
0.1
1
10
100
FREQUENCY (kHz)
150mA
75
50
50mA
100µA
20 40 60 80
TEMPERATURE (°C)
25
0
0
V
OUT
= 2.8V
C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
2.83
2.82
2.81
2.80
2.79
2.78
2.77
0
Output Voltage
vs. Output Current
3.2
2.8
2.4
2.0
1.6
1.2
Output Voltage
vs. Supply Voltage
3.00
2.95
2.90
2.85
2.80
2.75
Output Voltage
vs. Temperature
100µA
300mA
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
50 100 150 200 250 300
OUTPUT CURRENT (mA)
0.8
0.4
0
0
C
OUT
= 1µF
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
2.70
2.65
2.60
2.55
2.50
V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
I
OUT
= 100µA
20 40 60 80
TEMPERATURE (°C)
500
490
480
470
460
450
440
430
420
410
400
3.0
Current Limit
vs. Input Voltage
10
Output Noise
Spectral Density
1
0.1
V
OUT
= 2.8V
C
OUT
= 1µF
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
5.5
0.01 V
IN
= V
OUT
+ 1V
V
OUT
= 2.8V
C
OUT
= 1µF
0.001
0.01
0.1
1
10
100 1,000
FREQUENCY (kHz)
May 2008
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M9999-051508-D
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