MIC5306
150mA Micropower µCap Baseband LDO
General Description
The MIC5306 is a micropower, µCap low dropout
regulator designed for optimal performance in a small
space. It is capable of sourcing 150mA of output current
and only draws 16µA of operating current. This high
performance LDO offers fast transient response and
good PSRR while consuming a minimum of current.
Ideal for battery operated applications; the MIC5306
offers 1% accuracy, extremely low dropout voltage
(45mV @ 100mA). Equipped with a TTL logic
compatible enable pin, the MIC5306 can be put into a
zero-off-mode current state, drawing no current when
disabled.
The MIC5306 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
The MIC5306 is available in fixed output voltages in
Thin SOT23-5 packaging.
Features
•
•
•
•
•
Input voltage range: 2.25V to 5.5V
Ultra-low I
Q
: Only 16µA operating current
Stable with ceramic output capacitor
Low dropout voltage of 45mV @ 100mA
High output accuracy
- ±1.0% initial accuracy
- ±2.0% over temperature
•
Thermal Shutdown Protection
•
Current Limit Protection
Applications
•
•
•
•
•
•
Digital Logic Power Supply
Stand-by power supply
Cellular phones
PDAs
Portable electronics
Notebook PCs
_________________________________________________________________________________________________________
Typical Application
20
18
16
14
12
10
8
6
4
2
0
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
TEMPERATURE (°C)
Ground Pin Current
vs. Temperature
150mA
100µA
MIC5306
VIN
1µF
EN
GND
VOUT
1µF
Applications
Co-processor
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2005
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Block Diagram
VIN
OUT
EN
1.25V
Reference
GND
Ordering Information
Part Number
MIC5306-1.5YD5
MIC5306-2.8YD5
Note:
Other Voltage available. Contact Micrel for detail.
Marking Code
N915
N928
Output
Voltage
1.5V
2.8V
Junction Temperature Range
-40°C to 125°C
-40°C to 125°C
Package
TSOT23-5
TSOT23-5
August 2005
2
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Pin Configuration
EN GND VIN
1
3
2
4
N/C
5
OUT
MIC5306-x.xBD5
Pin Description
TSOT23
Pin No.
1
2
3
4
5
Pin
Description
IN
GND
EN
NC
OUT
Pin Function
Supply Input
Ground
Enable Input. Active High. High = on, low = off.
Do not leave floating.
No Connect
Output Voltage
August 2005
3
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
) .............................. 0V to 6V
Enable Input Voltage (V
EN
)............................. 0V to 6V
Power Dissipation (P
D
) ...................Internally Limited
(3)
Junction Temperature ....................... -40°C to +125°C
Lead Temperature (soldering, 5sec.) .................260°C
Storage Temperature (T
s
) ................. -65°C to +150°C
Operating Ratings
(2)
Supply Input Voltage (V
IN
)........................2.25V to 5.5V
Enable Input Voltage
(EN1/EN2/LOWQ)
.................. 0V to VIN
Junction Temperature (T
J
) .................. -40°C to +125°C
TSOT23-5(
θ
JA
) ............................................... 235°C
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 1.0µF, I
OUT
= 100µA; T
I
= 25°C,
bold
values indicate -40°C to +125, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
(4)
Conditions
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
= 100
µ
A to 150mA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
I
OUT
= 0mA to 150mA; V
IN
= 5.5V
V
EN
< 0.2V; V
IN
= 5.5V
f = 10Hz to 1kHz; C
OUT
= 1
µ
F; I
OUT
= 150mA
f = 20kHz; C
OUT
= 1
µ
F; I
OUT
= 150mA
V
OUT
= 0V
Min
-1
-2
Typ
0.01
0.5
25
45
65
16
0.01
62
35
285
150
15
91
Max
+1
+2
0.3
0.5
1
1.5
Units
%
%
%/V
%
mV
200
25
1
µA
µA
dB
500
mA
°C
°C
µVrms
V
V
µA
µA
µs
Ground Pin Current
Ground Pin Current in
Shutdown
Ripple Rejection
Current Limit
Thermal Shutdown
Thermal Shutdown Hysteresis
Output Voltage Noise
Enable Input
Enable Input Voltage
Enable Input Current
Turn-on Time
(5)
Notes:
175
C
OUT
= 1µF; 10Hz to 100kHz
Logic Low
Logic High
V
IL
< 0.2V
V
IH
> 1.0V
C
OUT
= 1µF
0.2
1.0
0.01
0.01
250
1
1
500
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. 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. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
August 2005
4
M9999-080805
(408) 955-1690
Micrel, Inc.
MIC5306
Typical Characteristics
Ripple Rejection
-80
20
GROUND CURRENT (µA)
150mA
Ground Pin Current
vs. Output Current
-70
-60
-50
dB
-40
-30
-20
100µA
18
16
14
12
10
8
6
4
2
0
0
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
20
18
16
14
12
10
8
6
4
2
0
Ground Pin Current
vs. Temperature
150mA
100µA
V
OUT
= 2.8V
-10 V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
0
0.01 0.1
1
10
100 1000
FREQUENCY (kHz)
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
TEMPERATURE (°C)
18
GROUND CURRENT (uA)
16
14
12
10
8
6
4
2
0
2
Ground Pin Current
vs. Supply Voltage
DROPOUT VOLTAGE (mV)
150mA
100µA
80
70
60
50
40
30
20
10
0
0
Dropout Voltage
vs. Output Current
DROPOUT VOLTAGE (mV)
100
90
80
70
60
50
40
30
20
10
0
Dropout Voltage
vs. Temperature
150mA
100mA
50mA
25mA
V
OUT
= 2.8V
C
OUT
= 1µF
2.5
3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
3
2.5
Output Voltage
vs. Supply Voltage
3.4
150mA
Output Voltage
vs. Temperature
3.2
3
2.8
2.6
2.4
V
OUT
= 2.8V
V
IN
= V
OUT
+ 1V
C
OUT
= 1µF
I
OUT
= 100µA
TEMPERATURE (°C)
1E+02
Output Noise
Spectral Density
1E+01
2 100µA
1.5
1
0.5
0
0
V
OUT
= 2.8V
C
OUT
= 1µF
1
2
3
4
5
SUPPLY VOLTAGE (V)
1E-00
1E-01 V
OUT
= 2.8V
V
IN
= 3.8V
C
OUT
= 1µF
R
OUT
1E-02
0.01 0.1
1
10 100 1000 10000
FREQUENCY (kHz)
2.2
2
350
OUTPUT CURRENT (mA)
300
250
200
150
100
50
Current Limit
vs. Supply Voltage
ENABLE THRESHOLD (V)
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Enable Threshold
vs. Temperature
0
3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4
SUPPLY VOLTAGE (V)
V
OUT
= 2.8V
C
OUT
= 1µF
TEMPERATURE (C)
August 2005
5
M9999-080805
(408) 955-1690
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