MIC5308
Low V
IN
/V
OUT
150mA High PSRR
ULDO™ with Ultra-Low IQ
General Description
The MIC5308 is a high performance, µCap low dropout
regulator, offering ultra-low operating current while
maintaining very fast transient response. The MIC5308
can source up to 150mA of output current and can
regulate down from a low input supply voltage to increase
system efficiency.
Ideal for battery operated applications; the MIC5308 offers
extremely low dropout voltage 45mV typically @ 150mA,
and low ground current at all load conditions (typically
23µA). The MIC5308 can also be put into a zero-off-mode
current state, drawing virtually no current when disabled.
The MIC5308 is available in fixed output voltages in the
tiny 6-pin 1.6mm x 1.6mm thin MLF
®
leadless package as
well as the 6-pin TSOT-23 for cost sensitive applications.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage range: 1.6V to 5.5V
Guaranteed 150mA over temperature
Ultra Low dropout voltage of 45mV at 150mA
High PSRR, up to 90dB @ 1kHz
Output Voltage range: 0.8V to 2.0V
Very low ground current – 23µA under full load
Bias supply voltage range: 2.5V to 5.5V
Stable with 1µF ceramic output capacitor
150mA maximum output current at 1.6V input voltage
Very fast transient response – ideal for digital loads
Thermal shutdown and current limit protection
Tiny 6-pin 1.6mm x 1.6mm Thin MLF
®
package
Cost effective 6-pin TSOT-23 package
Applications
•
•
•
•
Mobile Phones
PDAs
GPS Receivers
Portable Electronics
___________________________________________________________________________________________________________
Typical Application
MIC5308
BIAS
VIN
VOUT
1.2V / 150mA
Li-Ion
2.7V to 4.2V
MIC23050
DC-to-DC
Converter
C
BIAS
1µF
C
IN
1µF
EN
GND
BYP
C
BYP
10nF
C
OUT
1µF
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.
MIC5308
Ordering Information
Part Number
MIC5308-1.2YMT
MIC5308-1.5YMT
MIC5308-1.8YMT
MIC5308YMT
MIC5308-1.2YD6
MIC5308-1.5YD6
MIC5308-1.8YD6
MIC5308YD6
Notes
For other voltage options. Contact Micrel Marketing for details.
Pin 1 identifier = .
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
®
▲
Voltage
1.2V
1.5V
1.8V
Adj.
1.2V
1.5V
1.8V
Adj.
Marking Codes
▲
▲
▲
▲
Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
6-Pin 1.6mm x 1.6mm Thin MLF
®
6-Pin 1.6mm x 1.6mm Thin MLF
®
6-Pin 1.6mm x 1.6mm Thin MLF
®
6-Pin 1.6mm x 1.6mm Thin MLF
®
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
1R2
1R5
1R8
ARA
QR12
QR15
QR18
QRAA
Pin Configuration
BIAS
3
BIAS 1
GND 2
VIN 3
6
5
4
BYP/ADJ
EN
VOUT
4
5
6
VOUT
BYP/ADJ EN
GND
2
VIN
1
6-Pin 1.6mm x 1.6mm Thin MLF
®
(MT)
6-Pin TSOT-23 (D6)
Pin Description
Pin Number
Thin MLF-6
3
2
1
6
5
4
HS Pad
Pin Number
TSOT-23-6
1
2
3
4
Pin Name
VIN
GND
BIAS
BYP
ADJ
Pin Function
Power Input for LDO.
Ground
Bias Input Voltage.
Bypass: Connect a capacitor to ground to reduce noise and
reduce ripple rejection.
Adjustable: Feedback input from external resistor divider.
Enable Input: Active High Input. Logic High = On;
Logic Low = Off; Do not leave floating.
Output of regulator.
Exposed heatsink pad connected to ground internally.
5
6
–
EN
VOUT
EPAD
May 2008
2
M9999-051508-D
Micrel, Inc.
MIC5308
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................ 0V to V
BIAS
Bias Supply Voltage (V
BIAS
).................................. 0V to +6V
Enable Voltage (V
EN
)........................................... 0V to V
BIAS
Power Dissipation, ................................ Internally Limited
(3)
Lead Temperature (soldering, 10µsec.)..................... 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 3kV
Operating Ratings
(2)
Supply Voltage (V
IN
)........................................+1.6V to
V
BIAS
Bias Supply Voltage (V
BIAS
).......................... +2.5V to +5.5V
Enable Input Voltage (V
EN
)...................................0V to
V
BIAS
Junction Temperature (T
J
) ........................ –40°C to +125°C
Junction Thermal Resistance
1.6x1.6 MLF-6 (θ
JA
) ...........................................90°C/W
TSOT-23-6 (θ
JA
)...............................................235°C/W
Electrical Characteristics
V
BIAS
= 3.6V; V
IN
= V
OUT
+ 1V; V
IN
≤
V
BIAS
; 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
Reference Voltage
V
BIAS
Line Regulation
V
IN
Line Regulation
Load Regulation
Dropout Voltage
Ground Pin Current
(5)
Condition
Variation from nominal V
OUT
ADJ pin voltage
V
BIAS
= 3.6 to 5.5V,
V
IN
= V
OUT
+ 1V
Min
–
2.0
Typ
0.775
0.01
0.02
0.2
45
23
0.01
70
Max
+2.0
0.7905
0.3
0.2
1
150
35
2.0
Units
%
V
%/V
%/V
%
mV
µA
µA
dB
dB
dB
mA
µV
RMS
0.7595
V
IN
= V
OUT
+ 1V,
V
BIAS
= 5.5V
I
OUT
= 100µA to 150mA
I
OUT
= 150mA
I
OUT
= 100µA to 150mA
V
EN
≤
0.2V
f = up to 1kHz; C
OUT
= 1.0µF; no C
BYP
f = up to 1kHz;C
OUT
= 1.0µF; C
BYP
= 10nF
f = 20kHz; C
OUT
= 1.0µF; C
BYP
= 10nF
50
Ground Pin Current in
Shutdown
V
IN
Ripple Rejection
90
80
Current Limit
Output Voltage Noise
f = up to 1kHz;C
OUT
= 1.0µF; C
BYP
= 10nF
f = 20kHz; C
OUT
= 1.0µF; C
BYP
= 10nF
Logic Low
Logic High
180
325
28
Enable Inputs (EN)
Enable Input Voltage
Enable Input Current
Turn-on Time
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.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5. I
GND
= I
IN
+ I
BIAS
– I
OUT
.
0.2
1.2
0.17
1.5
150
V
V
µA
µA
µs
V
IL
≤
0.2V
V
IH
≥
1.2V
C
OUT
= 1.0µF; C
BYP
= 10nF
1
1
500
May 2008
3
M9999-051508-D
Micrel, Inc.
MIC5308
Typical Characteristics
-120
-100
-80
-60
50mA
150mA
100µA
(no byp)
Power Supply
Rejection Ratio (V
IN
)
100µA
100mA
-100
-90
-80
-70
-60
Power Supply
Rejection Ratio (V
BIAS
)
100µA
10
9
8
7
6
5
Ground Current (V
IN
)
vs. Temperature
150mA
100µA
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
20 40 60 80
TEMPERATURE (°C)
-40 V = V
IN
OUT
+ 1V
V
OUT
= 1.2V
-20 C
OUT
= 1µF
C
BYP
= 0.01µF
0
10
100
1K
10K 100K
FREQUENCY (Hz)
-50
150mA
-40
-30
50mA
1M
-20 V
IN
= 2.8V
V
= 1.8V
-10
OUT
C
OUT
= 1µF
0
10
100
1K
10K 100K
FREQUENCY (Hz)
4
3
2
1
0
1M
10
9
8
7
6
5
4
3
2
1
0
0
Ground Current (V
IN
)
vs. Output Current
16
14
12
10
8
Ground Current (V
BIAS
)
vs. Output Current
30
28
26
24
22
20
Ground Current (Total)
vs. Output Current
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
6
4
2
0
0
V
IN
= 2.2V
V
BIAS
= 3.6V
C
OUT
= 1µF
C
BYP
= 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
18
16
14
12
10
0
V
IN
= 2.2V
V
BIAS
= 3.6V
C
OUT
= 1µF
C
BYP
= 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
10
9
8
7
6
5
4
3
2
1
Ground Current (V
IN
)
vs. V
IN
150mA
100µA
40
35
30
25
20
15
Bias Current
vs. Enable Voltage
100µA
80
70
60
50
Dropout Voltage
vs. Temperature
150mA
150mA
40
30
V
BIAS
= 5.5V
V
OUT
= 1.8V
C
OUT
= 1µF
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
V
BIAS
= 5.5V
V
OUT
= 1.8V
C
OUT
= 1µF
10
5
0
0
20
10
0
C
OUT
= 1µF
20 40 60 80
TEMPERATURE (°C)
1
2
3
4
5
ENABLE VOLTAGE (V)
50
45
40
35
30
25
20
15
10
5
0
0
Dropout Voltage
vs. Output Current
1.30
Output Voltage
vs. Temperature
1.30
Output Voltage
vs. Output Current
1.25
1.25
1.20
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
I
OUT
= 100µA
20 40 60 80
TEMPERATURE (°C)
1.20
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
25 50 75 100 125
OUTPUT CURRENT (mA)
1.15
C
OUT
= 1µF
25 50 75 100 125 150
OUTPUT CURRENT (mA)
1.15
1.10
1.10
May 2008
4
M9999-051508-D
Micrel, Inc.
MIC5308
Typical Characteristics (continued)
2.0
1.8
1.6
1.4
100µA
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
V
BIAS
= 5.5V
V
OUT
= 1.2V
C
OUT
= 1µF
3
VIN (V)
4
5
150mA
Output Voltage
vs. V
IN
0.900
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
Reference Voltage
vs. Temperature
V
IN
= 2.2V
V
BIAS
= 3.6V
V
OUT
= 1.2V
C
OUT
= 1µF
I
OUT
= 100µA
400
350
300
250
200
150
Current Limit
vs. V
IN
20 40 60 80
TEMPERATURE (°C)
100
1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
V
OUT
= 1.8V
V
BIAS
= 3.6V
10
Output Noise
Spectral Density
1
0.1
0.01 C
OUT
= 1µF
C
BYP
= 0.01µF
I
LOAD
0.001
10
100
1K
10K 100K
FREQUENCY (Hz)
1M
May 2008
5
M9999-051508-D
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